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Low-TVOC polyurethane weather-proof sealant and preparation method thereof

A polyurethane and sealant technology, applied in the field of sealants, can solve the problems of high TVOC content, difficulty in meeting the standards of car manufacturers, and high odor, and achieve the effects of simple preparation method, outstanding weather resistance, and good mechanical properties.

Inactive Publication Date: 2016-07-06
GUANGDONG PUSTAR SEALED RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, most of the bonding and sealing of vehicle glass use polyurethane sealing adhesive, but due to the use environment of the vehicle, in addition to the mobility, it is often exposed to the outdoor natural environment, which makes the weather resistance of the sealant used for vehicles In the presence of light, heat, oxygen, water and microorganisms in the natural environment, polyurethane is prone to thermo-oxidative degradation, hydrolysis, photodegradation and microbial degradation, etc., which will cause its mechanical properties to decrease and colloidal surface to appear. A series of problems such as cracking, pulverization, and strong odor
The black sealant will also appear black water after the rain washes the pulverized surface, and black marks will appear on the window glass after drying, which seriously affects the appearance of the vehicle body and limits the durability of the one-component moisture-curing polyurethane sealant. sex
[0003] In addition, with the improvement of living standards, people pay more attention to environmental protection. For this reason, each car factory has strict corporate standards for the TVOC (total volatile organic compounds) content of the sealant used. In the traditional polyurethane preparation process, Organic solvents are usually used, so that the prepared polyurethane sealant will produce a certain odor when used for vehicle sealing
Therefore, the TVOC content of the polyurethane sealant in the prior art is relatively high, and it is difficult to meet the corporate standards of the relevant car manufacturers

Method used

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  • Low-TVOC polyurethane weather-proof sealant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] A low TVOC polyurethane weather-resistant sealant, which comprises the following components by weight percentage:

[0067] Polyurethane prepolymer 20% ~ 40%

[0068] Environmental diluent 15% ~ 40%

[0069] Compound stabilizer 0.3%~2%

[0070] Filler 30%~60%

[0071] Curing accelerator 0.3%~2%

[0072] Adhesion promoter 0.3%~2%

[0073] Water remover 0.3%~2%

[0074] Thixotropic agent 0.5% ~ 25%;

[0075] Wherein, the polyurethane prepolymer is made of the following components by weight percentage:

[0076] Polyether polyol 60%~88%

[0077] Isocyanate 10%~30%

[0078] Catalyst 0.1%~2.0%

[0079] Environmental diluent 0.5% ~ 8%;

[0080] Among them, the compound stabilizer is compounded by antioxidant, ultraviolet absorber and light stabilizer through a certain ratio, and the mass ratio of antioxidant, ultraviolet absorber and light stabilizer is 2~3:2~3 :1.

[0081] Among them, the antioxidant is one or more mixtures of hindered phenols, aromatic secondary a...

Embodiment 2

[0099] A low TVOC polyurethane weather-resistant sealant is prepared as follows: add 280g of polyurethane prepolymer P1, 10g of p-toluenesulfonyl isocyanate, and 6g of γ-(2,3-epoxypropoxy)propyltrimethoxy to a planetary stirring tank base silane, 12g compound stabilizer A (triethylene glycol bis-[3-(3-tert-butyl-4-hydroxyl-5-methylphenyl) propionate], 2-hydroxyl-4-octyloxy The mass ratio of benzophenone and the composite light stabilizer TinuvinPUR866 produced by BASF in Germany is 2:2:1), after stirring evenly, add pre-dried Benzoflex9-88180g, ground calcium carbonate 245g, nano 32g of zinc oxide, 110g of weather-resistant carbon black, 90g of polyamide wax powder, and 25g of fumed silica were stirred evenly under vacuum, and the vacuum was released with dry nitrogen, and 10g of dibutyltin dilaurate was added, then vacuumized and stirred evenly, and discharged , that is, to prepare low TVOC polyurethane weather-resistant sealant.

Embodiment 3

[0101]A low TVOC polyurethane weather-resistant sealant is prepared as follows: use 12g compound stabilizer B (tris(2,4-di-tert-butylphenyl) phosphite, 2-(2'-hydroxyl-3'-tert-butyl The mass ratio of -5'-methylphenyl)-5-chlorobenzotriazole and bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate is 2:2:1) Instead of 12g of compound stabilizer A, the other components are the same as in Example 2, and the similar steps as in Example 2 are repeated to obtain a low TVOC polyurethane weather-resistant sealant.

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Abstract

The invention relates to the technical field of sealant, in particular to low-TVOC polyurethane weather-proof sealant and a preparation method thereof.The low-TVOC polyurethane weather-proof sealant is prepared from polyurethane prepolymer, environment-friendly diluent, compound stabilizer, filler, solidification accelerant, bonding accelerant, a water removal agent and a thixotropic agent.The polyurethane prepolymer is prepared from polyether polyol, isocyanate, a catalyst and environment-friendly diluent.The low-TVOC polyurethane weather-proof sealant has the advantages of being low in TVOC, good in application property, quick in solidification, outstanding in weather-proof effect, free of rainwater flushing print and good in mechanical performance.After the low-TVOC polyurethane weather-proof sealant is applied, the phenomena of fracturing, pulverization and black water flowing happen in one year in the atmosphere environment, and the mechanical performance retention rate of the low-TVOC polyurethane weather-proof sealant ranges from about 80% to about 120%.

Description

technical field [0001] The invention relates to the technical field of sealants, in particular to a low TVOC polyurethane weather-resistant sealant and a preparation method thereof. Background technique [0002] At present, most of the bonding and sealing of vehicle glass use polyurethane sealing adhesive, but due to the use environment of the vehicle, in addition to the mobility, it is often exposed to the outdoor natural environment, which makes the weather resistance of the sealant used for vehicles In the presence of light, heat, oxygen, water and microorganisms in the natural environment, polyurethane is prone to thermo-oxidative degradation, hydrolysis, photodegradation and microbial degradation, etc., which will cause its mechanical properties to decrease and colloidal surface to appear. A series of problems such as cracking, pulverization, and strong odor. The black sealant will also appear black water after the rain washes the pulverized surface, and black marks wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J11/04C09J11/06C09J11/08C08G18/76C08G18/48
CPCC08G18/4812C08G18/7614C08G18/7671C08K2201/011C08L2201/08C09J11/04C09J11/06C09J11/08C09J175/08C08L77/00C08K13/02C08K2003/2296C08K3/04C08K3/36C08K2003/265C08K5/1345C08K5/132C08K5/526C08K5/3475C08K5/3435
Inventor 文强张志文武安福
Owner GUANGDONG PUSTAR SEALED RAYON CO LTD
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