KR100760473B1 - Polyurethane Multi-layer Waterproof Sheet - Google Patents

Abstract

The present invention is 57wt% asphalt, 12wt% SBS rubber, 6wt% butyl rubber, 8wt% synthetic aroma in the range of 40 to 50 invasion on the other side of the surface protection layer made of regenerated polyurethane sheet formed projections or irregularities on one side It is a polyurethane double layer waterproof sheet laminated with a waterproof layer composition composed of 2wt% of lime, slaked lime 2wt%, and 15wt% of polyurethane rubber cutting yarn.It can create innovative advantages in terms of resource recycling and pollution prevention by using waste. The surface protection layer made of polyurethane sheet has strong tensile strength, bursting strength and impact strength, and the waterproofing layer is excellent in following the behavior of structure change and the polyurethane double layer waterproof sheet has excellent adhesion and crack resistance over a long period of time. It is about.

Description

Polyurethane multilayer waterproof sheet {POLYURETHANE WATER PROOF SHEET CONSIST OF DOUBLE LAYERS}

The present invention relates to a polyurethane multi-layer waterproof sheet in which a waterproof composition composed mainly of rubberized asphalt is laminated on a polyurethane sheet regenerated from a soft or semi-soft polyurethane foam which is discarded. The regenerated urethane sheet contained in (Bulletin 10-0251269) has excellent elasticity and excellent behavior followability to structural changes, and it can prolong durability against hardening and does not cause cracking. Add styrene butadiene, styrene block copolymer or cis-styrene-isoprene-styrene block copolymer, butyl rubber, synthetic aromatic oil, and slaked lime to react for 3 to 4 hours, and then fully react. Layered polyurethane waterproof sheet It is about.

Waterproofing is a means of treating the waterproofing agent to give hydrophobicity to paper, leather, concrete, etc. Here, the waterproofing method of concrete is varied depending on the complex form and structure of modern architecture and high level of waterproofing material. Performance is required.

Waterproof methods include coating, coating, mortar, and watertight concrete. Examples of coating include asphalt waterproofing using asphalt roofing, but require hot working and are flexible and extensible when hardened. There is a drawback that cracking is easy to occur because of this little weather resistance. An improvement of this is a synthetic polymer roofing sheet, which is a sheet waterproofing method for bonding a lower layer to form a waterproofing layer, and a laminate of synthetic rubber or synthetic resin sheet such as polyisobutylene, IIR, EPDM, CR, PVC, polyethylene, EVA, etc. It is abundant in flexibility and has excellent adhesiveness to the stretchable and lower extremities.

Coating waterproofing is applied to the base of synthetic rubber, synthetic resin solution, latex and emulsion to form a waterproof layer of required thickness. Rubber, polyurethane, tar urethane, polysulfide, silicone liquid rubber, CR, crawlsulfonated polyethylene solution, CR , Latexes such as OSBR, IIR, and tar urethane are the most widely used.

Synthetic resins include vinyl acetate, acrylic, epoxy (tarpoxy), and furan, but are less than rubber. The waterproofing agent of the mortar waterproofing can be divided into inorganic, organic, and mixed system of both. The organic type is metal soap (salts of ore, stearic acid, Ca, Al, Zn, NH ₄ ), butyl stearate, paraffin emulsion, asphalt emulsion, various resin emulsions, Synthetic rubber latex, water-soluble resin, etc. are added to the cement mortar to obtain waterproof. Each method using the above-mentioned waterproofing agents has advantages and disadvantages, but there are practicalities depending on the form of the structure, the site (site), the use of the waterproofing object, the required functionality, and the economical efficiency. It can be called an excellent construction method.

As a specific conventional embodiment applying the above-described method, Korean Laid-Open Patent Publication (Publication No. 10-2005-0002726) is a field of coating film waterproof sheet, and the surface layer is EVA resin (ethylene vinyl acetate copolymer resin) and LLDPE resin (low molecular weight). Low-density polyethylene resin) is a waterproof coating sheet laminated in the order of nonwoven fabric and asphalt layer on the lower surface of the mixed sheet.The first waterproof sheet is extremely weak against acid and solvent, compared with other thermoplastic resins. It is a weak resin and thin to thickness, so it is easy to be ruptured by crushed stone or gravel that falls during cement concrete pouring. When the waterproofing surface is severely uneven, when the asphalt layer is pressurized by the protrusions, the asphalt layer is projected. Is pushed in all directions and the asphalt layer in contact with the protrusions becomes an extremely thin layer, If it is severe, the protrusion reaches the nonwoven fabric layer, and if the adhesiveness of the waterproof layer is reduced, water penetrates into the gap, and the nonwoven fabric layer becomes a passage of water, and water leakage may occur at the seams and ruptures of the surface layer. Although there are some differences depending on the weakness of the asphalt layer, as time passes due to the weakness of the asphalt layer, oxidative hardening, hardening by oil volatilization, physical hardening and osmotic hardening occur, and the asphalt layer having viscous becomes harder and numerous cracks are formed. As a result, the nonwoven layer becomes an index passage and water penetrates into the joints or ruptures of the weak surface layer, so that the waterproof function cannot be expected.

As another conventional technology, the domestic registered patent publication (notice No.:10-0251269) is a polyurethane waterproof laminated sheet developed and applied by him; It is currently in practical use, and acquired the Recycle Mark (Quality Recyclable Goods Quality Certification) by National Institute of Quality Technology as No. 98-1, and obtained the NT (New Technology) certificate by Small and Medium Business Administration as No. 96-95. There have been problems that need to be supplemented to improve the quality of the product which has been constructed and is expected to increase in the future, or during the significant construction period. First, the regenerated urethane sheet of the surface protection sheet has a thickness range of at least 1 ~ 2㎜, and the tensile strength, impact strength, rupture strength, durability, etc. are unsurpassed compared to other surface protection sheets made of thermoplastic synthetic resin, Its function as a surface protection layer is excellent, but it can cause safety accidents when the surface layer is wet or rainy when the surface is waterproofed or when the roof is inclined, which can cause safety accidents. There is a problem that flows down while sliding slowly requires a solution for this. This is not limited to the urethane sheet surface protection layer, but may also be a problem corresponding to the surface protection layer made of other thermoplastic synthetic resin.

Another problem relates to the waterproof layer using asphalt as the main raw material. In the initial stage of construction, the adhesiveness with the bottom surface is good, but the adhesion is weakened over time. If the thin film layer is formed in the government of the government or if the surface of the surface protective layer is projected to reach the bottom and there is a problem such as cracking of the waterproof layer by the hardening of the waterproof layer.

Of course, asphalt is extremely waterproof at the initial stage, but it is due to the physical properties of asphalt itself, but as a result of the asphalt's physical properties, the asphalt layer of the asphalt layer increases with time due to evaporation of the cured oil component and curing by osmosis of the oil component. Cracking, viscosity decrease by heat, lack of cold resistance after curing, lack of elasticity and flexibility are severe. Of course, in the present invention, in order to supplement such an asphalt layer, synthetic rubber, non-drying oil, etc. are added to reduce excessive fluidity due to added heat and have elasticity or flexibility in the long term, but improvement is required by improvement.

The present invention is to solve the problems of the conventional coating film waterproof sheet and at the same time to a polyurethane multilayer waterproof sheet which focuses on the improvement of the polyurethane waterproof laminated sheet of the domestic patent publication (Publication No .: 10-0251269) Rubber and synthetic aromatic oils are added to the asphalt layer to form irregularities or protrusions on the outer surface of the polyurethane surface protection layer for safety and ease of construction work. In order to maintain adhesiveness, added rubber and slaked lime and discarded polyurethane rubber (elastomer) yarn are added to give elasticity and flexibility over a long period of time to prevent cracking and pressure resistance between the waterproof bottom layer and the upper mortar layer at the construction stage. Polyurethane to prevent thinning of the waterproofing layer and to prevent cracking by The aim is to provide a double layer waterproof sheet.

The present invention is to mix the asphalt, non-drying oil, SBS rubber, gilded rubber, slaked lime in the surface protection layer formed with protrusions or unevenness on one side of the polyurethane sheet reclaimed soft or semi-soft polyurethane foam (Foam) to be discarded The present invention relates to a polyurethane multilayer waterproof sheet obtained by coating and laminating a waterproofing layer composition in which a polyurethane cutting yarn is added and homogenized to a sufficiently reacted melt.

Step 1: Surface protection sheet (recycled polyurethane sheet) molding process

The semi-liquid sheet extruded at a temperature of 170 ° C. to 180 ° C. in a T-die through a blending process using a polyurethane sheet composition described in Korean Patent Publication No. 10-0251269 is passed through a roller. After obtaining a smooth surface through the embossing roller of the releasable release at a temperature range of 140 ℃ ~ 150 ℃ to form a projection or irregularities and then wound on the winding roller or proceeding continuously to apply a waterproofing composition.

2 step process: manufacturing process of waterproof layer composition

Mixing synthetic aromatic oil, SBS rubber, crumb rubber, and slaked lime in the state of melting asphalt at the temperature of 40 ~ 50 in the range of 40 ~ 50 invasion degree and stirring it for 3 ~ 4 hours while maintaining the above temperature The solution is homogenized by dissolving and reacting, and then gradually lowering the temperature to maintain the temperature of 80 to 90 ° C. to increase the viscosity to decrease the fluidity and to homogenize the polyurethane cutting yarn.

3 step process: waterproof layer formation process

The polyurethane multilayer waterproof sheet according to the present invention is obtained by extruding and applying the waterproofing layer melt composition prepared in the two-step process on the back smooth surface of the recycled polyurethane sheet obtained in the first step process and passing through a roller.

In the above one-step process, the sheet extruded from the T-die is not a sheet, the viscosity is low, and the adhesiveness cannot be embossed at the instant of extrusion, and is cooled on a release paper of the moving conveyor belt smooth surface. Passing the releasable roller in the range of 150 ℃ can be a smooth sheet and the temperature range of the embossing operation is extremely limited as described above in accordance with the rapid phase change of the regenerated urethane melt.

In the above two step process, the choice of the penetration of asphalt has a great influence on the dissolution and reaction temperature. For this reason, in case of chip size 2, softening point is 95 ℃, intrusion degree is softening point 85 ℃, and in case of chip size 100, softening point is 50 ℃. The choice of penetration is determined by melting and reaction temperature. At such a low temperature, dissolution of synthetic rubber is not easy and takes a great working time. Also, if the melting and reaction temperature is high, the composition may have a deterioration phenomenon and adversely affect the product.

In addition, the synthetic aromatic oil here is composed of 40wt% aromatic oil, naphtha oil 30wt%, wax 30wt%, synthetic aromatic oil is to prevent the hardening of asphalt, and when the addition amount is high, the viscosity of the waterproof layer is difficult to form a coating film is difficult During construction, the thickness of the coating layer is biased.

In addition, adding a polyurethane cutting sand at the temperature of the waterproof composition to increase the viscosity is to prevent the cutting thread as well as the slaked lime under the thin viscosity and does not add the polyurethane cutting sand together from the initial stage of the reaction. It does not dissolve in the melt of the waterproofing composition, but it swells after a long time and becomes intact after several days, causing problems in the dimensional stability of the waterproofing layer and weakening of the tensile strength of the waterproofing layer by the cutting thread.

And as an additive, SBS rubber or butyl rubber is used for the purpose of rubber asphalting, and it functions as rubber asphalt, but butyl rubber maintains adhesiveness in the long term.

In particular, calcium hydroxide (lime lime) reacts with the carboxylic acid present in the asphalt to attach other carboxyl groups such as ketones to the aggregate surface. Since these compounds are not easily removed by water, they prevent the removal of asphalt and prevent the removal of asphalt. Improve adhesion.

In addition, the rubber yarn used here is a polyurethane rubber (elastomer) yarn and is a new yarn used for clothing, etc., and it is a scrap generated during processing of bad yarns generated in the manufacturing process of new yarn. It is an extremely difficult waste. It is difficult to incinerate or bury it even after decades without oxidation or corrosion.

The physical properties of these polyurethane rubber yarns are extremely soft, elongate 7 to 9 times, diameter 0.2 mm to 0.3 mm, and cut them to about 0.5 mm to 0.7 mm. This is caused by adding such cutting sand to the asphalt composition. The function is that the asphalt waterproof layer by the pressure of the protrusion due to the unevenness of the bottom layer when a large close pressure action between the bottom layer of the structure and the cement mortar forming layer in the state that there is a significant flow in the rubberized asphalt layer in the initial stage after the waterproof sheet construction or construction It is possible to prevent the thinning of the film and to give the rubberized asphalt layer semi-permanently and elasticity, so it has excellent tracking of the bottom structure and absorbs the shock generated by the waterproof layer. .

The most important ones were the waterproof layer composition, which contains 57 wt% asphalt, 40 wt% SBS rubber, 12 wt% SBS rubber, 6 wt% butyl rubber, 8 wt% synthetic aromatic oil, 15 wt% polyurethane cutting yarn, and 2 wt% slaked lime. Although the waterproofing layer is formed by the aforementioned method, in the step of forming the waterproofing layer, a loss of 5 to 6 wt% occurs due to the evaporation of asphalt oil and synthetic aromatic oil during heat treatment.

In the above composition, if the amount of asphalt is small, rubberized asphalt is difficult, and it takes enormous time to swell and dissolve rubber by heat treatment. Also, if the amount of rubber is reduced, the change of phase becomes severe due to the thermal change of the waterproof layer, and thus the viscosity decreases during hot work. As fluidity is increased and the temperature drops, it becomes hard, so that construction work is not easy and cracks are easily generated in the waterproof layer. In addition, if the amount of polyurethane cutting is increased, it is advantageous in terms of using waste, but the circular return property is increased due to elasticity, thereby decreasing the close adhesion with the bottom of the structure during construction and affecting the waterproofing property.

In order to more clearly identify the polyurethane multilayer waterproof sheet described above, Example 1 was given as follows.

Example (1)

First, a recycled urethane sheet having a thickness of 1.5 mm having protrusions formed on a surface thereof was manufactured by a first step process of manufacturing a polyurethane multilayer waterproof sheet of the present invention.

Next, 12 kg of SBS rubber, 6 kg of butyled rubber, 8 kg of synthetic aromatic oil, and 2 kg of slaked lime were added to the asphalt solution of 57 kg of asphalt having an infiltration degree of 50 ° C. at 120 ° C., followed by reaction for 3 and a half hours. After cooling and maintaining at 85 ° C. to increase the viscosity, 15 kg of rubber sand is added and homogenized by stirring. Then, the homogenized rubberized asphalt liquid is extruded into a sheet and laminated to a thickness of 1.5 mm on the rear surface of the recycled urethane sheet to be cooled at room temperature. Polyurethane multilayer waterproof sheet was prepared.

The polyurethane multilayer waterproof sheet thus prepared is a polyurethane multilayer waterproof sheet having a thickness of 1.5 mm and a total thickness of 3 mm of a thickness of the surface layer of 1.5 mm.

In order to find out the properties of the polyurethane multi-layer waterproof sheet obtained above, a test report was obtained as shown in Table (1).

Table (1) Polyurethane multilayer waterproof sheet physical property test report acceptance No. 2005-1542

The results of comparing the properties of the polyurethane multilayer waterproof sheet obtained in Table (1) with the tensile strength, elongation rate, tear strength and elongation at -20 ° C of the polyurethane multilayer waterproof sheet according to Korean Patent Publication (Publication No. 10-0251269) The result as shown in Table (2) was obtained.

Table (2): Comparison of Table (1) and Properties of Polyurethane Multi-layer Waterproof Sheet

Test Item KS standard value Polyurethane multilayer waterproof sheet of table (1) Polyurethane double layer waterproof sheet of Korean patent publication (Notice No.:10-0251269) Tensile Strength (㎏f / cm) 6.1 or later 17.2 27 Elongation (%) 250 or more 690 3,000 or more (not measurable) Tear strength (㎏f) 3.1 and above 17.4 8 or more % Elongation at -20 ℃ 50 or more 150 3,000 or more

Polyurethane multi-layer waterproof sheet of the present invention can reduce the production cost by about half by using waste, and can also play a role in preventing pollution due to the extremely difficult waste disposal, and also in terms of functional safety. And it is possible to ensure the ease of operation and can be said to be polyurethane multi-layer waterproof sheet that can be significantly superior to the conventional double layer waterproof sheet and can greatly extend the durability.

Claims (3)

Asphalt 57wt%, SBS rubber 12wt%, Butyl rubber 6wt%, Synthetic aromatic oil 8wt%, Slaked lime on the other side of the surface protection layer made of recycled polyurethane sheet with protrusions or irregularities on one side Polyurethane multilayer waterproof sheet laminated with a waterproofing layer composition composed of 2wt% and 15wt% of polyurethane rubber cutting thread. The surface protective layer of claim 1 is a polyurethane that is a surface protective layer treated with a releasable embossing roller at a temperature of 140 to 150 ° C. by cooling a semi-liquid sheet extruded at a temperature of 170 to 180 ° C. in an extrusion die with a polyurethane recycled material. Multi-layer waterproof sheet. The method of claim 1, wherein the waterproof layer composition is dissolved and reacted with stirring for 3 to 4 hours while maintaining the temperature by mixing SBS rubber, butyl rubber, synthetic aromatic oil and slaked lime in the state of melting asphalt at a temperature of 90 ~ 130 ℃ And a polyurethane double layer waterproof sheet which is a waterproof layer composition which is homogenized again by adding a polyurethane fine cutting thread in a state in which the fluidity is decreased and the fluidity is reduced by maintaining a temperature of 80 ~ 90 ° C.