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Polyurethane sealant with weather resistance and preparation method of polyurethane sealant

A polyurethane sealant and weather resistance technology, applied in the field of sealant, can solve the problems of poor use effect, photooxidative aging, high stress, etc., and achieve the effect of slow mechanical property decay, excellent yellowing resistance, and good elasticity

Inactive Publication Date: 2018-01-09
PUYANG CITY WANQUAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the problem of high stress in the production and processing of polyurethane itself, the product quality is relatively unstable, and it is prone to damage during use.
Moreover, although the polyurethane resin surface itself has strong strength, it is not wear-resistant and is easily scratched, which makes the product use effect poor. Rubber also has the defect of not being resistant to aging, and polyurethane resin also exists.
[0003] At present, although polyurethane stabilization technology has been developed, the UV resistance of polyurethane sealants can be improved by adding additives, but the existing polyurethane sealants still have the following disadvantages: 1. Under the long-term irradiation of natural light and ultraviolet rays, The polyurethane sealant will turn yellow and affect the appearance; 2. Due to the phenomenon of photooxidative aging, the mechanical properties of the polyurethane sealant will decrease, and the surface of the colloid will crack
Therefore, the existing polyurethane sealants are prone to yellowing, have poor weather resistance, and cannot be used for a long time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0036] (1) First make isocyanate resin A

[0037] Dehydration of polyether polyol with a weight percentage of 85% under vacuum at 130°C for 3 hours and cooling to 85°C with 15% diphenylmethane diisocyanate at 85°C for 5 hours to produce NCO1.8~2.4% The isocyanate resin A;

[0038] (2) Making isocyanate resin B

[0039] The isocyanate resin B is produced by dehydrating 88% polyether polyol under vacuum at 130°C for 3 hours, cooling down to 85°C and reacting with 12% isophorone diisocyanic acid at 85°C for 4 hours Isocyanate resin B containing NCO1.8~2.2%;

[0040] (3) 25% isocyanate resin A, 10% isocyanate resin B, 10% anti-migration plasticizer, 4.5% epoxy soybean oil, 6% high pressure polyethylene, 10% PVC weighed according to the following ratio Resin paste and 25% nano-calcium carbonate flow into the twin-screw disperser at a uniform speed for homogeneous dispersion. The dispersed material enters the cooling system to reduce the material below 35 degrees. After entering ...

specific Embodiment 2

[0041] The difference from Embodiment 1 is that the ratio of the composition used in step 3 is different.

[0042] Step 3 of this specific embodiment is as follows:

[0043] (3) 20% isocyanate resin A, 12% isocyanate resin B, 11% anti-migration plasticizer, 4% epoxy soybean oil, 5% high pressure polyethylene, 11% PVC weighed according to the following ratio Resin paste and 30% nano-calcium carbonate flow into the twin-screw disperser at a uniform speed for homogeneous dispersion. The dispersed material enters the cooling system to reduce the material below 35 degrees. After entering the static mixer, a certain amount of 0.4% anti-corrosion Oxygen 1010, 0.4% antioxidant TNP, 0.9% UV absorber, 2% zinc oxide, 2% carbon black, 0.8% UV-R (2-(2'-Xiang-5'-methylphenyl ) Benzotriazole), 0.5% organotin catalyst are added to the cooled material, fully dispersed to obtain weather-resistant polyurethane sealant.

specific Embodiment 3

[0044] The difference from specific example 1 is that the ratio of the composition used in step 3 is different.

[0045] Step 3 of this specific embodiment is as follows:

[0046] (3) 30% isocyanate resin A, 9% isocyanate resin B, 8% anti-migration plasticizer, 5% epoxy soybean oil, 7% high pressure polyethylene, 9% PVC weighed according to the following ratio Resin paste and 20% nano-calcium carbonate flow into the twin-screw disperser at a uniform speed for homogeneous dispersion. The dispersed material enters the cooling system to reduce the material below 35 degrees. After entering the static mixer, a certain amount of 0.5% anti-corrosion Oxygen 1010, 0.5% antioxidant TNP, 1.2% UV absorber, 4% zinc oxide, 4% carbon black, 1.2% UV-R (2-(2'-Xiang-5'-methylphenyl ) Benzotriazole), 0.6% organotin catalyst were added to the cooled material, and fully dispersed to obtain a weather-resistant polyurethane sealant.

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Abstract

The invention belongs to the technical field of sealants and particularly relates to a polyurethane sealant with weather resistance and a preparation method of the polyurethane sealant. The polyurethane sealant with weather resistance is prepared from following components in percentage by weight through reaction: 20%-30% of isocyanate resin A, 8%-12% of isocyanate resin B, 8%-12% of a migration-resistant plasticizer, 4%-5% of vegetable oil, 5%-7% of high-pressure polyethylene, 8%-12% of PVC (polyvinyl chloride) resin paste, 20%-30% of nano calcium carbonate, 0.8%-1.2% of an antioxidant, 0.8%-1.2% of an ultraviolet light absorber, 2%-4% of zinc oxide, 2%-4% of carbon black, 0.8%-1.2% of UV-R(2-(2'-hydroxy-5'-methyl phenyl) benzotriazole) and 0.4%-0.6% of a catalyst. The sealant can be takenas a caulking sealing material to be widely applied to buildings, squares and highways and can be applied to sealing in the aspects of automobile making, electronic filling, submarines, rockets and the like.

Description

technical field [0001] The invention belongs to the technical field of sealant, and in particular relates to a weather-resistant polyurethane sealant and a preparation method thereof. Background technique [0002] Polyurethane sealant is one of the three high-performance elastic sealants. It has good adhesion to many materials, and has the advantages of wear resistance, cold resistance, good elasticity, vibration resistance, etc., and has a long service life. This provides favorable conditions for its extensive use in construction. Polyurethane sealant is a sealant mainly composed of polyurethane rubber and polyurethane prepolymer. However, due to the problem of high stress in the production and processing of polyurethane itself, the quality of the product is relatively unstable, and it is prone to damage during use. Moreover, although the polyurethane resin surface itself has strong strength, it is not wear-resistant and is easily scratched, which makes the product use ef...

Claims

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Application Information

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IPC IPC(8): C09J175/08C09J123/06C09J127/06C09J11/04C09J11/06
Inventor 任正义侯兴习李晓鹏赵本浩魏景梅李金峰
Owner PUYANG CITY WANQUAN CHEM
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