CN115850609B - An additive package production line and process for producing PVC hard products - Google Patents
An additive package production line and process for producing PVC hard products Download PDFInfo
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Abstract
本申请涉及塑胶助剂的领域，具体公开了一种用于PVC硬制品生产的助剂包生产线及其工艺。一种用于PVC硬制品生产的助剂包生产线，包括加工改性微粒生产工序；其中，加工改性微粒生产工序包括胶乳颗粒制备步骤和加工改性微粒制备步骤，胶乳颗粒是以端羟基聚丁二烯、苯乙烯、含氟丙烯酸酯为原料，进行聚合；加工改性微粒是胶乳颗粒和氯乙烯为原料进行聚合。加工改性微粒与添加剂共混而成的助剂包加入至聚氯乙烯中，可以显著提升聚氯乙烯的加工性能和机械性能。The present application relates to the field of plastic additives, and specifically discloses an additive package production line and process for the production of PVC hard products. An additive package production line for the production of PVC hard products includes a processing and modification microparticle production process; wherein the processing and modification microparticle production process includes a latex particle preparation step and a processing and modification microparticle preparation step, wherein the latex particles are polymerized using terminal hydroxyl polybutadiene, styrene, and fluorinated acrylate as raw materials; and the processing and modification microparticles are polymerized using latex particles and vinyl chloride as raw materials. The additive package formed by blending the processing and modification microparticles with additives is added to polyvinyl chloride, which can significantly improve the processing performance and mechanical properties of polyvinyl chloride.
Description
Technical Field
The application relates to the technical field of plastic additives, in particular to an additive package production line and a process thereof for producing PVC hard products.
Background
Polyvinyl chloride (PVC) has excellent comprehensive performance, and is widely applied to the fields of building material industry, light industry, agricultural and sideline industry and the like as one of five general plastics. PVC is usually prepared into various products by injection molding and extrusion processes, but the decomposition temperature and plasticizing temperature of the PVC are very close due to the structural characteristics of the PVC, so that the PVC is easy to decompose in the processing process, hydrogen chloride is released, the color of the product is yellow, and the performance is reduced.
In the related art, in order to reduce the processing difficulty of polyvinyl chloride, a plasticizer is selectively added into the polyvinyl chloride. The plasticizer is mainly small molecular substances such as dibutyl phthalate, dioctyl phthalate and the like. The compatibility of the small molecular plasticizer and PVC is poor, the addition amount is difficult to control, the addition amount of the plasticizer is in the anti-plasticizing concentration range, and the performance of the product is easily reduced.
The plasticizer may be a high molecular polymer polyacrylate copolymer. However, the polyacrylate copolymer has complex composition, and the different copolymerization compositions lead to remarkable performance difference of the polyacrylate copolymer, so that the blending amount and the processing temperature of the polyacrylate copolymer have remarkable influence on PVC processing performance. When the blending amount of the polyacrylate copolymer is low, the processability of PVC is improved only to a limited extent, and when the blending amount of the polyacrylate copolymer is too high, the PVC melt fracture is easily caused, and the quality of the product is reduced.
In view of the above, there is a need in the art to develop an additive that can significantly improve the processability of PVC materials, so that the processability of PVC can be significantly improved, and at the same time, the performance of PVC products can be improved.
Disclosure of Invention
The application provides an auxiliary agent package production line for producing PVC hard products and a process thereof, and the auxiliary agent can fully improve the processing performance of PVC materials.
In a first aspect, the application provides an auxiliary agent package production line for producing PVC hard products, which adopts the following technical scheme:
An auxiliary agent package production line for producing PVC hard products comprises a processing modified particle production procedure;
wherein the process for producing the modified particles comprises the following steps:
The preparation of latex particles, namely uniformly mixing water, a pH regulator I, an emulsifying agent, an initiator I, hydroxyl-terminated polybutadiene, styrene, fluorine-containing acrylic ester and a cross-linking agent, and polymerizing under inert atmosphere to obtain the latex particles, wherein the weight ratio of the hydroxyl-terminated polybutadiene to the styrene to the fluorine-containing acrylic ester is (12-28): (25-37): (35-63);
the processing modified particles are prepared by blending the obtained latex particles, water, a second pH regulator, a second dispersing agent and a second initiator, vacuumizing under inert atmosphere, and then adding vinyl chloride monomer for polymerization, wherein the weight ratio of the vinyl chloride monomer to the fluorine-containing acrylic ester is (26.8-34.2) (35-63).
By adopting the technical scheme, the processing modification auxiliary agent is added into the polyvinyl chloride to obviously improve the processing performance and mechanical performance of the polyvinyl chloride by firstly polymerizing hydroxyl-terminated polybutadiene, styrene and fluorine-containing acrylic ester to form latex particles through double bond addition reaction and then grafting a polyvinyl chloride chain segment outside the latex particles through addition reaction. The principle is as follows:
The modified polyvinyl chloride particles contain a large number of functional groups with stronger polarity, such as ester bonds, hydroxyl groups, fluorine, chlorine and the like, can generate induced dipole moment interaction with polar chlorine elements in the polyvinyl chloride, increases acting force between the modified polyvinyl chloride particles and polyvinyl chloride molecular chains, is granular, has a plurality of branched chains, can weaken acting force between the polyvinyl chloride molecular chains, promotes movement of the polyvinyl chloride molecular chains, maintains melt viscosity of the polyvinyl chloride in a moderate range, is beneficial to low-temperature plasticization of the polyvinyl chloride, and secondly, contains polyvinyl chloride chain segments, so that the modified polyvinyl chloride particles have better compatibility with the polyvinyl chloride, are easier to insert and distribute in the middle of the polyvinyl chloride, and can accelerate melting plasticization of the polyvinyl chloride while achieving remarkable plasticization. And the mechanical properties of the polyvinyl chloride can be adjusted by processing the soft alkyl chain segment and the rigid benzene ring chain segment contained in the modified particles.
In addition, fluorocarbon bonds are introduced into the processing modified particles, and the breakage of ester bonds can be reduced due to the strong shielding effect of the fluorocarbon bonds, so that the heat resistance of the processing modified particles is further effectively improved, the processing modified particles are not easy to break and degrade at high temperature, and the long-acting processing performance is realized.
Meanwhile, as the processing modified particles contain active functional groups such as hydroxyl groups, in the processing process, the partially degraded polyvinyl chloride generates a multiolefin chain segment which can be connected to the processing modification auxiliary agent, so that the polyvinyl chloride has better stability as a whole.
In conclusion, the special processing modified particles can reduce the processing difficulty of the polyvinyl chloride, improve the processing performance of the polyvinyl chloride, enable the polyvinyl chloride to be melted and plasticized in a short time, and the processed product has excellent mechanical properties.
Preferably, the weight ratio of the hydroxyl-terminated polybutadiene to the styrene to the fluorine-containing acrylic ester is (20-24)/(30-32)/(44-50).
Preferably, the weight ratio of the vinyl chloride monomer to the fluorine-containing acrylic ester is (30-32) to (44-50).
By adopting the technical scheme, the doping amount of the hydroxyl-terminated polybutadiene, the styrene, the fluorine-containing acrylic ester and the vinyl chloride monomer is adjusted, so that the processability and the comprehensive use performance of the polyvinyl chloride can be further optimized under the same doping amount due to the adjustment of the chain segment structure.
Preferably, the polymerization temperature of the latex particles is 60-80 ℃ and the polymerization time is 30-60 min.
Preferably, the polymerization temperature of the processing modified particles is 60-80 ℃ and the polymerization time is 30-45 min.
Preferably, the particle size of the processing modified particles is 5 to 50 μm.
By adopting the technical scheme, the polymerization temperature and the polymerization time are optimized, so that the possibility of the explosion phenomenon can be reduced, the production efficiency of the processed modified particles is improved, the size of the processed modified particles can be controlled within a moderate range, the dispersion performance of the processed modified particles in the polyvinyl chloride is further improved, the processed modified particles are added into the polyvinyl chloride, stress concentration points are not easy to form, and the impact resistance of the polyvinyl chloride is improved.
Preferably, the fluorine-containing acrylate is one or more of perfluoroalkyl ethyl methacrylate, 2- (perfluorobutyl) ethyl methacrylate and 3- (perfluoro-5-methyl hexyl) -2-hydroxypropyl methacrylate. More preferably, the fluoroacrylate is 3- (perfluoro-5-methyl hexyl) -2-hydroxypropyl methacrylate.
By adopting the technical scheme, the fluorine-containing acrylic ester comprises but is not limited to 2- (perfluorododecyl) ethyl acrylate, 2- (perfluorobutyl) ethyl acrylate, perfluoroalkyl ethyl methacrylate and the like, and compared with 2- (perfluorododecyl) ethyl acrylate, 2- (perfluorobutyl) ethyl acrylate, perfluoroalkyl ethyl methacrylate and 2- (perfluorobutyl) ethyl methacrylate, the fluorine chain length of 3- (perfluoro-5-methyl hexyl) -2-hydroxypropyl methacrylate is moderate, the influence on the grafting rate of hydroxyl-terminated polybutadiene and styrene is smaller, and the further improvement of the processability and mechanical properties of polyvinyl chloride is facilitated.
Optionally, the auxiliary agent packet further comprises an additive, wherein the additive is zinc oxide.
By adopting the technical scheme, the additives include, but are not limited to, ultraviolet absorbers, heat stabilizers, lubricants and the like, and the ultraviolet absorbers are added into the polyvinyl chloride together with the processing modified particles, so that the yellowing resistance of the polyvinyl chloride product can be effectively improved, and the comprehensive service performance of the polyvinyl chloride is further improved. The zinc oxide can reflect ultraviolet light to a certain extent, and can better improve the yellowing resistance of the processing modification auxiliary agent. Meanwhile, the zinc oxide surface contains active functional groups such as hydroxyl groups, and the like, so that the zinc oxide has better compatibility with the processed modified particles under the action of polar bonds such as hydrogen bonds, so that the dispersibility in polyvinyl chloride is better, and the stress concentration point in the polyvinyl chloride can be reduced. In addition, zinc oxide and processing modified particles play a synergistic role in improving the processing performance of polyvinyl chloride.
Preferably, the weight ratio of the zinc oxide to the processing modified particles is 1 (9-10).
By adopting the technical scheme, the addition amount of zinc oxide is optimized, so that the balance between the plasticizing performance and the mechanical performance of the polyvinyl chloride can be improved, and the plasticizing performance and the mechanical performance of the polyvinyl chloride can be further improved.
In a second aspect, the application provides an auxiliary agent package production process for producing PVC hard products, which adopts the following technical scheme:
an auxiliary agent bag production process for producing PVC hard products comprises the following steps:
(1) Processing modified particles;
(2) Screening the particle size of the processed modified particles;
(3) Blending of the process-modified microparticles with additives.
By adopting the technical scheme, the processing aid used in the polyvinyl chloride can obviously improve the processing performance and obtain excellent mechanical properties, in particular notch impact strength and yellowing resistance.
In summary, the application has at least the following advantages:
according to the application, hydroxyl-terminated polybutadiene, styrene and fluorine-containing acrylate are crosslinked through double bonds to prepare latex particles, and a layer of polyvinyl chloride is coated on the outer layer of the latex particles, so that the processing modified particles have good compatibility in the processing of the polyvinyl chloride and are fully dispersed in the polyvinyl chloride. The modified particles contain a large number of functional groups with stronger polarity, such as ester bonds, hydroxyl groups, fluorine, chlorine and the like, can generate induced dipole moment interaction with polar chlorine elements in the polyvinyl chloride, and weaken acting force among molecules, so that the processing performance of the polyvinyl chloride is improved, and the modified polyvinyl chloride has better low-temperature plasticizing performance. Meanwhile, the flexible alkyl chain segment and the rigid benzene ring chain segment contained in the modified particles are processed, so that the mechanical properties of the polyvinyl chloride can be adjusted, and the polyvinyl chloride has better processing properties and better mechanical properties.
Detailed Description
In the related art, the processing aid used for the polyvinyl chloride is generally a small molecular plasticizer, but the compatibility between the small molecular plasticizer and the polyvinyl chloride is poor, the addition amount is difficult to control, and the plasticizer cannot play a plasticizing effect when added into the polyvinyl chloride within a reverse plasticizing concentration range, and the mechanical property of the polyvinyl chloride is reduced. When the adding amount of the high polymer plasticizer polyacrylate is too high in the use process, the viscosity of the polyvinyl chloride is too high, and the melt fracture of the polyvinyl chloride is easy to cause.
The inventor researches the structure and molecular chain segments of the processing aid of the polyvinyl chloride, and discovers that the polymer obtained by taking fluorine-containing acrylic ester, hydroxyl-terminated polybutadiene and styrene as reaction raw materials contains a large number of polar functional groups such as ester bonds, hydroxyl groups and fluorine and the like, can generate induced dipole moment interaction with polar chlorine elements in the polyvinyl chloride, increases the acting force between processing modified particles and the polyvinyl chloride molecular chain, reduces the acting force between the polyvinyl chloride, is beneficial to low-temperature plasticization of the polyvinyl chloride, grafts the polyvinyl chloride chain segments on the polymer, has better compatibility between the processing modified particles and the polyvinyl chloride, is easier to insert and distribute in the middle of the polyvinyl chloride, and can accelerate the melting plasticization of the polyvinyl chloride while achieving remarkable plasticization effect. And the mechanical properties of the polyvinyl chloride can be adjusted by processing the soft alkyl chain segment and the rigid benzene ring chain segment contained in the modified particles. The technical problem of the application is successfully solved, namely, the novel polyvinyl chloride processing aid is provided, so that the mechanical property of the polyvinyl chloride can be improved while the polyvinyl chloride has better processing property.
In addition, the processing modified particles and the ultraviolet absorber in the additive are used together, so that the yellowing resistance of the polyvinyl chloride product can be effectively improved, and the comprehensive use performance of the polyvinyl chloride is further improved.
The present application will be described in further detail with reference to examples, comparative examples and application examples.
The raw materials used in the examples and comparative examples of the present application are as follows unless otherwise specified.
Hydroxyl-terminated polybutadiene:
Form I, number average molecular weight 3.8X10 3～4.6×103, hydroxyl number 0.48mmol/g;
form III, number average molecular weight 3.0X10 3～3.6×103, hydroxyl number 0.70mmol/g;
form IV, number average molecular weight 2.7X10 3～3.0×103, hydroxyl number 0.80mmol/g.
Emulsifying agent
The first emulsifier and the second emulsifier are selected from fatty alcohol polyoxyethylene ether, sodium stearate and the like, wherein the first emulsifier and the second emulsifier both use alkylphenol polyoxyethylene ammonium sulfate CO436;
Initiator(s)
The first initiator and the second initiator are selected from potassium persulfate, ammonium persulfate, sodium persulfate and sodium bisulfite, wherein the first initiator is prepared by compounding the potassium persulfate and the sodium bisulfite according to the weight ratio of 1:1;
The cross-linking agent is selected from the group consisting of, but not limited to, t-butyl hydroperoxide, which is selected in the present application;
pH regulator A and pH regulator B are chosen from sodium dihydrogen phosphate and ammonium bicarbonate, and in the present application, the pH regulator A and the pH regulator B are both ammonium bicarbonate.
Examples
Example 1
An auxiliary agent bag for producing PVC hard products is prepared by the following steps:
(1) Process modified particle production
Latex particle preparation:
s1, sequentially adding 1kg of an emulsifier I, 0.06kg of an initiator I and 150kg of deionized water into a pre-emulsifying kettle, stirring and dissolving, adding a polymerization raw material which is 1.2kg of hydroxyl-terminated polybutadiene I, 2.5kg of styrene and 6.3kg of 3- (perfluoro-5-methyl hexyl) -2-hydroxypropyl methacrylate into the pre-emulsifying kettle, stirring and emulsifying for 20min to obtain a pre-emulsion I;
s2, filling nitrogen into a polymerization kettle for protection, sequentially adding 0.01kg of emulsifier I, 2kg of deionized water, 0.003kgpH of regulator I and 0.001kg of cross-linking agent tert-butyl hydroperoxide into the polymerization kettle, starting stirring, and raising the temperature to 50 ℃;
s3, slowly dropwise adding the pre-emulsion obtained in the step S1 into a polymerization kettle, controlling the dropwise adding time to be 2-3 hours, heating to 55 ℃ after dropwise adding, carrying out heat preservation reaction for 3 hours, and then cooling to 40 ℃ for discharging to obtain latex particle emulsion;
S4, demulsifying, washing and drying the prepared copolymer emulsion to obtain powdery latex particles;
preparation of the processing modified particles:
A1, sequentially adding 1kg of an emulsifying agent II, 0.06kg of an initiator II, 0.003kg of a pH regulator II and 150kg of deionized water into a pre-emulsifying kettle, stirring and dissolving;
adding the latex particles obtained in the step S4 into a pre-emulsification kettle, and stirring and emulsifying for 20min to obtain a pre-emulsion II;
A2, air in the nitrogen replacement reaction kettle is pumped and exhausted for three times, the replacement pressure is-0.5 MPa, and 2.68kg of vinyl chloride monomer is added after the replacement is finished, the stirring speed is increased, and the stirring speed is controlled to be 500rpm/min;
Adding the second pre-emulsion into the reaction kettle from the top of the reaction kettle through pressure, heating to 55 ℃, preserving heat and reacting for 3 hours, when the pressure in the kettle is reduced to 0.7MPa, cooling and releasing pressure to terminate the reaction, discharging the unreacted vinyl chloride, filtering, washing and drying the discharged material to obtain the processing modified particles.
(2) Particle size screening of process modified microparticles
Screening the processed modified particles, and selecting the particle size to be 5-50 mu m;
(3) Blending of process-modified microparticles with additives
And mixing 350g of processing modified particles with the particle size of 0.5-5 mu m with 25g of additive Basf1010 to prepare an auxiliary agent packet for producing PVC hard products.
Examples 2 to 7
An auxiliary package for the production of PVC hard products differs from example 1 in the composition of the process-modified particles, as shown in table 1 below:
TABLE 1 composition of modified processed microparticles
| Composition/kg | Example 1 | Example 2 | Example 3 | Example 4 |
| Hydroxyl-terminated polybutadiene (I type) | 1.2 | 2 | 2.4 | 2.8 |
| Styrene | 2.5 | 3 | 3.2 | 3.7 |
| 3- (Perfluoro-5-methyl hexyl) -2-hydroxypropyl methacrylate | 6.3 | 5 | 4.4 | 6.3 |
| Vinyl chloride | 2.68 | 2.68 | 2.68 | 2.68 |
| Composition/kg | Example 5 | Example 6 | Example 7 | |
| Hydroxyl-terminated polybutadiene (I type) | 2 | 2 | 2 | |
| Styrene | 3 | 3 | 3 | |
| 3- (Perfluoro-5-methyl hexyl) -2-hydroxypropyl methacrylate | 5 | 5 | 5 | |
| Vinyl chloride | 3 | 3.2 | 3.5 |
Examples 8 to 10
An auxiliary agent package for the production of PVC hard products differs from example 5 in that the processing parameters of steps S4 and A2 differ, in particular the processing parameters are as follows:
In the embodiment 8, the temperature is raised to 60 ℃ in the step S4, the reaction is carried out for 60min at the heat preservation, the temperature is raised to 60 ℃ in the step A2, and the reaction is carried out for 45min at the heat preservation;
in the embodiment 9, the temperature is raised to 80 ℃ in the step S4, the reaction is carried out for 30min at a constant temperature, the temperature is raised to 60 ℃ in the step A2, and the reaction is carried out for 30min at a constant temperature;
In example 10, the temperature is raised to 85 ℃ in step S4, the reaction is kept for 15min, and the temperature is raised to 85 ℃ in step A2, the reaction is kept for 15min.
Example 11
An auxiliary agent package for PVC hard product production is different from example 8 in the kind of fluorine-containing acrylate, specifically as follows;
Example 11 was prepared by substituting an equivalent weight of 3- (perfluoro-5-methyl hexyl) -2-hydroxypropyl methacrylate with 2- (perfluorododecyl) ethyl acrylate;
In example 12, the equivalent weight of 3- (perfluoro-5-methyl hexyl) -2-hydroxypropyl methacrylate was replaced with 2- (perfluorobutyl) ethyl acrylate.
Examples 13 to 14
An auxiliary bag for the production of PVC hard products differs from example 8 in the type of hydroxyl-terminated polybutadiene, in particular as follows;
the equivalent weight of hydroxy terminated polybutadiene type I was replaced with hydroxy terminated polybutadiene type III in example 13;
The equivalent weight of hydroxy terminated polybutadiene type I was replaced with hydroxy terminated polybutadiene type IV in example 14.
Examples 15 to 16
An auxiliary agent package for the production of PVC hard products differs from example 14 in that the particle size of the process-modified particles is different, specifically as follows:
the particle size of the modified particles processed in example 15 is 100 to 300 μm;
In example 16, the particle diameter of the modified fine particles was 0.1 to 5. Mu.m.
Example 17
An auxiliary agent pack for PVC hard product production differs from example 14 in that, unlike the additive, zinc oxide or the like having a particle diameter of 0.1 to 0.5 μm is used instead of Basf1010 in this example.
Examples 18 to 20
An auxiliary package for the production of PVC hard products differs from example 17 in that the zinc oxide differs from the processing modified particles in weight, in particular as follows:
The amount of modified particles processed in example 18 was 450g, and the amount of zinc oxide was 50g;
the amount of the modified particles processed in example 19 was 500g, and the amount of zinc oxide was 50g;
the amount of modified particles processed in example 20 was 650g and the amount of zinc oxide was 100g.
Comparative example
Comparative examples 1 to 4
An auxiliary package for the production of PVC hard products differs from example 1 in the composition of the process-modified particles, as shown in table 2 below:
TABLE 2 composition of modified processed microparticles
| Composition/kg | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 |
| Hydroxyl-terminated polybutadiene (I type) | 3.24 | / | 1.6 | 1.2 |
| Styrene | 6.76 | 2.84 | / | 2.5 |
| 3- (Perfluoro-5-methyl hexyl) -2-hydroxypropyl methacrylate | / | 7.16 | 8.4 | 6.3 |
| Vinyl chloride | 2.68 | 2.68 | 2.68 | / |
Performance test the additive packages for PVC hard product production prepared in examples 1 to 20 and comparative examples 1 to 4 were added to polyvinyl chloride, the model of the polyvinyl chloride was SG-5, and the amount of the PVC processing additive was 5wt% based on the weight of the polyvinyl chloride SG-5, and melt blending and extrusion were performed to obtain test samples. A1X 10cm long strip was cut according to the standard and the following tests were performed:
cutting into notched impact test bars according to GB/T1843-2008 standard by a universal sampling machine, and performing impact test (test temperature: 23 ℃) by adopting a cantilever impact tester;
The stretching speed is 20mm/min (test temperature: 23 ℃) according to the GB/T1040-2006 standard.
And (3) taking a detection sample with the thickness of 1mm, testing on a color difference index instrument, selecting five different parts for each sample, taking the average value of the five values, and calculating the standard deviation of the average value. The irradiation dose of the test sample was 15kGy.
The processing performance is that the plasticizing time of the detection sample is recorded;
scoring the surface finish of the test sample on a scale of 1-5;
the scoring was evaluated as follows:
grade 5, the PVC material has smooth and flat surface and no pit;
Grade 4, the surface of the PVC material is smoother, and pits are not obvious;
Grade 3, the surface smoothness of the PVC material is general, and pits are obvious;
2, the surface of the PVC material is rough, and the local pits are obvious;
grade 1, the surface of the PVC material is extremely rough, and the whole pit is uneven.
Detection result
TABLE 4 use effect test data for examples 1-20, comparative examples 1-4
The test samples in examples 1-20 had a melt plasticizing temperature of 150-165℃and a highest torque of 21.7-22.6 Nm, while comparative examples 1-4 had a melt plasticizing temperature of 176-185℃and a highest torque of 24.6-27.8 Nm, which indicated that the use of the adjuvant package of the present application was effective in improving the low temperature processability of polyvinyl chloride.
It can be seen from the combination of examples 1 and comparative examples 1 to 4 and Table 4 that the absence of fluoroacrylate in comparative example 1, the absence of hydroxyl-terminated polybutadiene in comparative example 2, the absence of styrene in comparative example 3, and the absence of polyvinyl chloride in comparative example 4, all of which have poor mechanical properties, long plasticizing time and high plasticizing temperature, it can be seen that fluoroacrylate, hydroxyl-terminated polybutadiene, styrene and vinyl chloride have a synergistic effect in improving the plasticizing properties and mechanical properties of polyvinyl chloride.
It can be seen from the combination of examples 14 to 16 and Table 4 that the particle size of the processing modifying particles has an effect on the processability of polyvinyl chloride, since the particle size affects the distribution of the processing modifying particles in polyvinyl chloride and thus the processability and mechanical properties of polyvinyl chloride.
As can be seen by combining examples 17-20 and Table 4, the processing modified particles are within a certain blending amount range, and the processing property and mechanical property of the polyvinyl chloride product can be remarkably improved, probably because the blending amount of the processing modified particles is improved within a certain range, the melt viscosity of the polyvinyl chloride is less influenced, the melt fracture of the polyvinyl chloride is not easily caused, and the processing property of the polyvinyl chloride is excellent.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (9)
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