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One-component moisture-cured polyurethane sealant with excellent ultraviolet resistance

A polyurethane sealant, UV-resistant technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of undiscovered UV resistance, mechanical performance decline, excellent mature products, etc., to achieve good The effect of UV resistance

Active Publication Date: 2014-06-04
HUBEI HUITIAN NEW MATERIALS STOCK CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of one-component moisture-curing polyurethane sealant on the exterior of the car body has the following disadvantages: under the long-term irradiation of ultraviolet rays by natural light, photooxidative aging will occur, mechanical properties will decline, cracks will occur on the surface of the colloid, and the white sealant will yellow. Change, the black sealant will flow black water after being washed by rainwater, which will affect the appearance of the car body and limit the long-term use of one-component moisture-curing polyurethane sealant
Although polyurethane stabilization technology has been developed, the UV resistance of polyurethane sealants can be improved by adding additives, but no mature products with excellent UV resistance have been found in the market

Method used

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  • One-component moisture-cured polyurethane sealant with excellent ultraviolet resistance

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Experimental program
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Effect test

specific Embodiment approach

[0047] Preparation of sealant: add polyurethane prepolymer Ⅰ, polyurethane prepolymer Ⅱ, water absorption stabilizer, coupling agent, light stabilizer, antioxidant and other additives into the planetary stirring tank in proportion, after stirring evenly, add pre- Stir the dry filler and thixotropic agent evenly in a vacuum state, release the vacuum with dry nitrogen, add the catalyst, vacuumize and stir evenly, discharge the material, and fill it in an airtight container for later use.

[0048] The environment for the production and packaging of one-component polyurethane sealants should be controlled at a temperature of ≤25°C and a relative humidity of ≤55%RH. Air conditioners and dehumidifiers should be used if necessary.

[0049] Performance Testing:

[0050] Squeeze out an appropriate amount of one-component polyurethane sealant on the PTFE board, scrape it into a layer of 2mm thick glue with a plastering knife, and make sure there are no air bubbles in the glue. After pl...

Embodiment 1

[0056] Add 117g polyurethane prepolymer I to the planetary stirring tank 2 , 225g polyurethane prepolymer II 7 , 8g toluenesulfonyl isocyanate, 5g γ-(2,3-glycidyloxy)propyltrimethoxysilane, 5g Irganox1098, 8g UV327, 3g LA-62, after stirring evenly, add 301g of pre-dried calcium carbonate, 45g of PVC paste resin, 20g of carbon black, 235g of polyurea, and 20g of fumed silica were stirred evenly under vacuum, the vacuum was released with dry nitrogen, and 8g of dibutyltin dilaurate was added to vacuumize and stir evenly, then the material was discharged and filled in Store in an airtight container for later use.

Embodiment 2

[0058] Add 130g polyurethane prepolymer I to the planetary stirring tank 1, 220g polyurethane prepolymer II 6 , 8g toluenesulfonyl isocyanate, 5g γ-(2,3-glycidyloxy) propyltrimethoxysilane, 5g Irgastab PU68, 8g UV-P, 3g Tinuvin770, after stirring evenly, add 301g of pre-dried calcium carbonate , carbon black 20g, polyurea 235g, anhydrous calcium sulfate whisker 57g, stir evenly under vacuum, release the vacuum with dry nitrogen, add 8g dibutyltin dilaurate, vacuumize and stir evenly, discharge, fill in airtight container In order to spare.

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Abstract

A one-component moisture-cured polyurethane sealant with excellent ultraviolet resistance belongs to the technical field of one-component moisture-cured polyurethane sealants, mainly solves the problems of photooxidation aging phenomenon, mechanical properties decreasing, sealant surface cracking, yellowing of white sealants and black water flowing of black sealants for the reason of rain erosion of one-component moisture-cured polyurethane sealants in the prior art under the effects of long-term irradiation of ultraviolet ray in natural light, and is mainly characterized by including 8 to 20 parts of a polyurethane prepolymer (I), 20 to 30 parts of a polyurethane prepolymer (II), 0.5 to 2 parts of a water absorption stabilizer, 0.1 to 0.7 part of a silane coupling agent, 0.1 to 1 part of a light stabilizer, 0.1 to 1 part of an antioxidant, 28 to 50 parts of a polyurethane-use filler, 1 to 4 parts of carbon black, 1 to 35 parts of a thixotropic agent and 0.4-2 parts of a catalyst. The one-component moisture-cured polyurethane sealant has the advantages of no cracking after placing in an ultraviolet aging box for 8000h, no black mark after pasting with a non-setting adhesive tape, good elasticity maintainence and less than 30% of decrease of the elongation at break, and is suitable for auto-body exterior caulking.

Description

technical field [0001] The invention belongs to the technical field of one-component moisture-curing polyurethane sealant, and relates to a one-component moisture-curing polyurethane sealant with excellent ultraviolet resistance for medium and high-grade automobile loading and maintenance, which is suitable for caulking the exterior of car bodies. Background technique [0002] Since the mid-1970s, one-component moisture-curing polyurethane sealant has been more and more widely used in the sealing of automobile body glass due to its high elasticity, strong shock resistance, chemical corrosion resistance, and light weight. However, the use of one-component moisture-curing polyurethane sealant on the exterior of the car body has the following disadvantages: under the long-term irradiation of ultraviolet rays by natural light, photooxidative aging will occur, mechanical properties will decline, cracks will occur on the surface of the colloid, and the white sealant will yellow. T...

Claims

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Application Information

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IPC IPC(8): C09J175/08C09J11/04C09J11/06
Inventor 赵祖培韩胜利唐礼道吴燕峰张虎极
Owner HUBEI HUITIAN NEW MATERIALS STOCK CO LTD
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