CN115609965A - A kind of rigid foam processing technology - Google Patents

Abstract

The present invention is applicable to the technical field of rigid foam processing, and provides a rigid foam processing technology, comprising the following steps: attaching grid cloth to the upper surface and the lower surface of the rigid foam board; , open multiple grooves on the grid cloth on the upper surface of the rigid foam board, the depth of the grooves is less than the thickness of the rigid foam board; after the grooves are completed, pour reinforcement on the grid cloth on the upper surface of the rigid foam Material, the surface reinforcement material and the reinforcement material in the groove form a whole. The rigid foam processing technology provided by the present invention adds a cloth sticking process, and the mesh cloth is pasted on the upper and lower sides of the board to form a sandwich similar to a "sandwich". structure, the upper surface grid cloth is cut through the opening of shallow grooves and deep grooves, and then through the perfusion of reinforcing materials, through the combination of shallow grooves, deep grooves and additional mesh cloth on the surface, after actual perfusion The shear strength and peel strength have been significantly improved.

Description

A kind of rigid foam processing technology

technical field

The invention belongs to the technical field of rigid foam processing, and in particular relates to a rigid foam processing technology.

Background technique

Rigid foam plastic refers to the foam plastic that has no flexibility, high compression hardness, deformation when the stress reaches a certain value, and cannot return to its original shape after the stress is relieved. It is often used in related aspects by using its heat insulation and mechanical properties. Representative products are polystyrene foam, rigid polyurethane foam, and foams such as phenolic, amino, epoxy, and thermosetting acrylate resins, as well as rigid polyvinyl chloride foam. It can be used as heat insulation material, interlayer material, packaging material, sound insulation and shockproof material, building material, etc.;

Now, the performance requirements of customers are constantly improving, and the individual performance data (such as peel strength) of rigid foam can no longer meet the demand. Moreover, the existing process structure and process processing methods are relatively simple, the optimization form is relatively limited, and the competitiveness is insufficient.

Contents of the invention

The invention provides a rigid foam processing technology, which aims to solve the problems that the current customers have continuously improved the performance requirements of rigid foam, the individual performance data of rigid foam can no longer meet the demand, and the existing process structure and process processing methods are relatively single. .

The present invention is achieved in that a kind of rigid foam processing technology comprises the steps:

Lay grid cloth on the upper and lower surfaces of the rigid foam board;

After the mesh cloth is pasted, a plurality of grooves are opened on the mesh cloth on the upper surface of the rigid foam board;

After the slotting is completed, the reinforcing material is poured on the grid cloth on the upper surface of the rigid foam board, and the reinforcing material on the surface layer and the reinforcing material in the groove are integrated.

Preferably, the groove includes a groove A and a groove B, and the depth of the groove A is smaller than that of the groove B.

Preferably, a plurality of grooves A and B arranged in parallel at intervals are provided along the length direction and the width direction of the rigid foam board.

Preferably, the grooves A and B in the same direction are arranged alternately in sequence.

Preferably, the ends of the slots A and B are open.

Compared with the prior art, the embodiments of the present application mainly have the following beneficial effects:

The rigid foam processing technology provided by the present invention adds a cloth sticking process, and the upper and lower sides of the board are pasted with mesh cloth to form a sandwich structure similar to a "sandwich", and the upper surface mesh cloth passes through shallow and deep grooves Cutting treatment is carried out to destroy the continuity of the mesh cloth on the upper surface, so that the mesh cloth is only attached to the hard foam on the upper surface, and the original force of the whole mesh cloth is changed to the mesh cloth cutting. The surface of several small squares at the end is stressed, which disperses the pulling force during peeling and increases the peeling strength. However, the mesh cloth on the lower surface still plays the role of opening deep grooves and preventing the pieces from falling, and then strengthens it through perfusion. Material, after pouring, because the grid cloth is cut when the groove is opened, the reinforcement material on the surface layer and the reinforcement material in the shallow groove and the deep groove form a whole, and the shallow groove and the deep groove will form in the shear or peel test. Extrusion resists the reaction force generated, increases the force during shearing or peeling, thereby improving the process performance of the material after infusion, meeting the performance requirements of customers, and expanding the product width and breadth by optimizing the process structure of rigid foam , By optimizing the processing method, the processing capacity of different process products is improved.

Description of drawings

Fig. 1 is a schematic diagram of the external structure of a kind of rigid foam processing technology embodiment 1 provided by the present invention;

Fig. 2 is a schematic diagram of the internal structure of Example 1 of a rigid foam processing technology provided by the present invention;

Fig. 3 is the flowchart of a kind of rigid foam processing technology embodiment 1 provided by the present invention;

Fig. 4 is a conventional design drawing in the prior art;

Figure 5 is a design drawing of adding mesh cloth and adding shallow grooves in the experimental scheme;

Figure 6 is the design diagram of the shallow groove + patch (the overall mesh is not interrupted) in the experimental plan;

Figure 7 is the design diagram of the shallow groove + patch (the mesh is cut off by slotting after patching) in the experimental scheme;

Fig. 8 is the histogram of the impact of mesh cloth on peel strength in the experimental scheme;

Fig. 9 is a schematic structural view of Embodiment 2 of a rigid foam processing technology provided by the present invention.

Notes on Reference Signs: 1. Rigid foam board; 2. Mesh cloth; 3. Reinforcing material; 4. Groove A; 5. Groove B; 6. Groove C.

detailed description

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the application; the terms used herein in the description of the application are only for the purpose of describing specific embodiments , is not intended to limit the present application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and the description of the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the description and claims of the present application or the above drawings are used to distinguish different objects, rather than to describe a specific order.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

Example 1

The embodiment of the present invention provides a rigid foam processing technology, as shown in Figure 1-Figure 3, comprising the following steps:

The upper surface and the lower surface of the rigid foam board 1 are respectively pasted with mesh cloth 2, and the mesh cloth 2 can be pasted with glue to form a sandwich structure similar to a "sandwich";

After the grid cloth 2 is pasted, a plurality of grooves are opened on the grid cloth 2 on the upper surface of the rigid foam board 1. Obviously, the depth of the grooves is smaller than the thickness of the rigid foam board 1. Specifically, the Groove comprises groove A4 and groove B5, and the depth of described groove A4 is less than the depth of groove B5, and the end of described groove A4 and groove B5 is open, and groove A4 is shallow groove, and its depth can be hard One-tenth to one-sixth of the thickness of the rigid foam board 1, groove B 5 is a deep groove, and its depth can be seven-eighths to nine-tenths of the thickness of the rigid foam board 1, of course, the depth of the groove Can be designed according to experiments, requirements, etc., without limitation;

It can be understood that the mesh cloth 2 on the upper surface is cut through opening of shallow grooves and deep grooves to destroy the continuity of the mesh cloth 2 on the upper surface, so that the mesh cloth 2 is only attached to the hard surface of the upper surface. quality foam. However, the grid cloth 2 on the lower surface of the rigid foam still plays the role of opening deep grooves and preventing them from falling after breaking off pieces;

After the slotting is completed, the reinforcement material 3 is poured on the grid cloth 2 on the upper surface of the rigid foam board 1, and the reinforcement material 3 on the surface layer is integrated with the reinforcement material 3 in the groove, and the reinforcement material 3 can be glass fiber reinforced plastic or other types Resin etc., in the present embodiment, reinforcing material 3 is preferably glass fiber reinforced plastics, glass fiber reinforced plastics is also called GFRP, namely fiber reinforced plastics, generally refers to glass fiber reinforced unsaturated polyester, epoxy resin and phenolic resin matrix, with glass fiber or its Reinforced plastics used as reinforcing materials for finished products are called glass fiber reinforced plastics, or FRP;

Further, after the FRP is poured, because the mesh cloth 2 is cut when the groove is opened, the surface FRP and the FRP in the shallow and deep grooves form a whole, and the shallow and deep grooves will form and function during the shear or peel test. Squeeze with opposite forces against the resulting reaction force, increasing the force when shearing or peeling;

During the peeling test, the surface grid cloth 2 has no continuity after being cut by the deep and shallow grooves, and the force on the entire surface of the entire grid cloth 2 has changed to that of multiple small square surfaces after the grid cloth 2 is cut. Force, which disperses the pulling force during peeling and increases the peeling strength.

Wherein, along the length direction and the width direction of the rigid foam board 1, there are multiple grooves A 4 and grooves B 5 arranged in parallel at intervals, and the distance between the parallel adjacent grooves A 4 can be 20mm. The spacing between adjacent grooves B 5 may be 30mm.

In a specific implementation, the grooves A 4 and grooves B 5 in the same direction may also be arranged alternately in sequence.

The following are some experimental protocols in the process of improving the research:

Option A: Verify the effect of different hole spacing on peel strength:

By increasing the number of punched holes (changing the hole spacing) to test whether there is an impact on the peeling performance. The experiment detects a total of three sets of data with different spacing, and each group is tested three times to get the average value. The detection is 10*10mm, 15*15mm, and 20*20mm spacing respectively. The comparison of the peeling data of the deep groove surface is as follows:

After adding the mesh cloth (that is, the aforementioned mesh cloth), the peeling data of the mesh cloth surface is compared as follows:

Punch spacing Number of punched holes in stripped area Peel strength, N.mm/mm 20*20mm 64 56.42 15*15mm 100 58.41 10*10mm 210 62.77

According to the comparative analysis of the above test data, the hole spacing has a certain influence on the peel strength, but to achieve a significant improvement, the hole spacing needs to be greatly reduced to a certain extent to achieve the goal, and the peel strength can be improved by adding mesh;

Option B: Mesh cloth on deep groove surface

Mesh surface (with shallow grooves) (HPE160), process: deep groove spacing 30*30mm, shallow groove spacing 20*20mm, hole spacing 20*20mm;

Experimental sample a: the process is mesh surface (the mesh is not interrupted);

Experimental sample b: the process is a mesh surface (the mesh is interrupted);

Peel strength, N.mm/mm Mesh surface (the mesh is not interrupted) 56.42 Mesh surface (interrupted by mesh) 66.68

Deep groove surface (HPE160): conventional process: deep groove spacing 30*30mm, shallow groove spacing 20*20mm, hole spacing 20*20mm;

Experimental sample c: the process is deep groove surface without cloth;

Experimental sample d: the process is deep groove surface patching (interruption);

Peel strength, N.mm/mm Deep groove surface does not stick cloth 31.15 Deep groove surface patch (interrupted) 50.46

Supplementary verification test

Effect of mesh on peeling: (HPE110)

The experimental sample uses the web technology of (double-sided cross shallow groove 20*20mm+perforation 20*20mm), and adds mesh cloth to one side of the same board;

Peel strength, N.mm/mm Deep groove surface does not stick cloth 32.52 Deep groove surface patch (interrupted) 52.48

As shown in Figure 8, it is a histogram of the effect of mesh on the peel strength. It can be seen from Figure 8 that adding mesh to the deep groove surface and interrupting it can effectively improve the peel strength. Compared with conventional deep grooves without mesh The surface peel strength increased by 17.25N.mm/mm, a year-on-year increase of 55.38%.

Principle analysis: adding mesh

As shown in Figure 4, it is a conventional design in the prior art (deep groove and perforation are the same point, no reference is made);

In the formula: M—peel strength (N/mm); Pb—average peel load (N); P0—resistance load (N); D—drum boss diameter (mm); d—drum diameter (mm); b— Sample width (mm);

In the case of identical sampling, the only variable is Pb (average peel load), which is the average value of the force at each position during peeling; increasing the force used for peeling at each position can improve the peel strength.

As shown in Figure 5, it is a design drawing for adding mesh cloth and adding shallow grooves (deep grooves and punching are the same point, not for reference);

According to the figure, in the peel test experiment, when the roller applies force according to the specified loading speed, the factors affecting the force are:

1. The resistance force F3 generated by the bonding of the mesh and the shell when peeling off

2. The anti-extrusion force F1 generated on both sides of the shallow groove during peeling

3. The resistance force F2 generated at the bottom of the shallow groove during peeling

当

时，P↑

when

when P↑

时，

when

hour,

As shown in Figure 6, it is the design drawing of shallow groove + patch (the overall mesh is not interrupted). In the actual test process, adding mesh on the surface of the shell does help to increase the peel strength; In the test, due to the continuity of the entire mesh, the mesh and FRP were peeled off together, and the FRP on the surface and the FRP in the shallow groove were separated by the mesh, which could not form a good fit with the shallow groove;

As shown in Figure 7, it is the design drawing of shallow groove + patch (groove and cut off the mesh after patching). After pasting the mesh, open the shallow groove of the shell, cut the mesh together, and peel off the test after pouring , the FRP on the surface and the FRP in the shallow groove form a whole, which increases the resistance during peeling; and after breaking the mesh, there is no continuity, and the stress on the whole surface changes to the force on multiple small square surfaces, which disperses The pulling force when peeling, thus greatly increasing the peel strength.

Example 2

This embodiment is based on Embodiment 1, as shown in Figure 9, before the step of pouring the reinforcement material 3, it also includes: setting up a plurality of parallel grooves C 6 along the depth direction on the side walls of the groove A 4 and the groove B 5 , the cross-sectional shape of groove C 6 can be rectangular, semicircular, triangular, etc., without limitation, and the size can be designed according to requirements. By designing groove C 6, after pouring reinforcement materials, the surface reinforcement material and groove A 4, groove B 5 and groove C 6 are drilled as a whole, which can further improve the peel strength.

To sum up, the present invention provides a kind of rigid foam processing technology. First, the upper surface and the lower surface of the rigid foam board 1 are respectively pasted with mesh cloth 2; A plurality of shallow grooves and deep grooves are set on the grid cloth 2 on the upper surface of the foam board 1; after the slotting is completed, the reinforcement material 3 is poured on the grid cloth 2 on the upper surface of the rigid foam board 1, and the reinforcement material 3 on the surface layer is in contact with the groove. The reinforcing material 3 in the groove forms a whole. Through the combination of deep and shallow grooves on the surface and the grid cloth 2, the shear strength and peel strength after actual infusion have been significantly improved. By improving the process performance of the material after infusion , To meet the customer's performance requirements, by optimizing the process structure of rigid foam, expand the product width and breadth, and by optimizing the process processing method, improve the processing capacity of different process products.

It should be noted that for the foregoing embodiments, for the sake of simple description, they are expressed as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because Certain steps may be performed in other orders or simultaneously in accordance with the invention. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

In the several embodiments provided in this application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the above units is only a logical function division. In actual implementation, there may be other division methods, for example, multiple units or components can be combined or integrated. to another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection between devices or units may be in the form of telecommunication or other forms.

The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

The above examples are only used to illustrate the technical solution of the present invention, but not to limit the protection scope of the invention. Apparently, the described embodiments are only some, not all, embodiments of the present invention. Based on these embodiments, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above-mentioned embodiments, those skilled in the art can still combine, add, delete, or make other adjustments to the features in the various embodiments of the present invention according to the situation without making creative efforts. Thereby, other technical solutions that are different and do not deviate from the concept of the present invention in essence are obtained, and these technical solutions also belong to the protection scope of the present invention.

Claims (7)

1. The rigid foam processing technology is characterized by comprising the following steps:

respectively sticking grid cloth on the upper surface and the lower surface of the hard foam board;

after the grid cloth is attached, a plurality of grooves are formed in the grid cloth on the upper surface of the hard foam board;

after the grooving is finished, a reinforcing material is poured on the gridding cloth on the upper surface of the rigid foam board, and the surface layer reinforcing material and the reinforcing material in the groove form a whole.

2. The rigid foam process of claim 1, wherein the groove comprises a groove A and a groove B, the groove A having a depth less than the groove B.

3. The rigid foam processing process according to claim 2, wherein a plurality of grooves A and grooves B are formed in parallel at intervals along both the length direction and the width direction of the rigid foam board.

4. The process according to claim 3, wherein the grooves A and B in the same direction are alternately arranged in sequence.

5. The rigid foam process of claim 4, wherein the ends of both channel A and channel B are open.

6. The rigid foam process of claim 2, further comprising, prior to the step of infusing a reinforcing material:

a plurality of parallel grooves C are arranged on the side walls of the grooves A and the grooves B along the depth direction.

7. The rigid foam process of claim 1, wherein the reinforcing material is glass reinforced plastic.

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