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One-component moisture cured polyurethane sealant excellent in weather resistance and preparation method thereof

A polyurethane sealant, moisture curing technology, applied in chemical instruments and methods, other chemical processes, adhesive additives, etc., can solve the problems of polyurethane sealant yellowing, poor weather resistance, colloidal surface cracks, etc., to achieve mechanical Slow performance attenuation, excellent yellowing resistance and excellent weather resistance

Inactive Publication Date: 2016-01-20
HUBEI HUITIAN NEW MATERIALS STOCK CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Under the long-term irradiation of natural light and ultraviolet rays, the polyurethane sealant will turn yellow and affect the appearance;
[0005] (2) Due to the phenomenon of photooxidative aging, the mechanical properties of the polyurethane sealant decrease, and cracks occur on the surface of the colloid
[0006] Therefore, the existing one-component moisture-curing polyurethane sealant is prone to yellowing, has poor weather resistance, and cannot be used for a long time

Method used

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  • One-component moisture cured polyurethane sealant excellent in weather resistance and preparation method thereof
  • One-component moisture cured polyurethane sealant excellent in weather resistance and preparation method thereof
  • One-component moisture cured polyurethane sealant excellent in weather resistance and preparation method thereof

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preparation example Construction

[0031] The embodiment of the present invention also provides a preparation method of the above-mentioned one-component moisture-curing polyurethane sealant with excellent weather resistance, comprising the following steps:

[0032] The environment for producing and packaging the polyurethane sealant should be controlled at a temperature of ≤25°C and a relative humidity of ≤55%RH;

[0033] Preparation of polyurethane prepolymer: In terms of parts by mass, add 20-65 parts of polyether polyol to a dry three-necked flask, vacuumize at 120°C, dehydrate for 0.5-1h, cool down to about 60°C, add 5- 30 parts of aliphatic or alicyclic isocyanate, 0.01-0.05 parts of the second catalyst, 0-7 parts of diluent, the second catalyst is dibutyltin dilaurate, stannous octoate, dibutyltin diacetate, 2,2- Any one of bismorpholinyl diethyl ether and 1,8-diazacycloundecene; slowly raise the temperature to 80°C, keep the temperature for 3 hours under the protection of dry nitrogen, and discharge the...

Embodiment 1

[0050] This embodiment provides a one-component moisture-curing polyurethane sealant with excellent weather resistance. In terms of parts by mass, the polyurethane sealant includes 34.5 parts of polyurethane prepolymer, 0.8 part of toluenesulfonyl isocyanate, and 0.3 part of γ-shrinkage Glyceryl ether oxypropyl trimethoxysilane, 0.6 parts of UV327, 0.3 parts of Irganox1098, 4 parts of titanium dioxide, 43 parts of calcium carbonate, 16 parts of polyurea, 0.8 parts of lead octoate; among them, the polyurethane prepolymer includes 27 parts of polyether di Alcohol Tdiol-2000, 13 parts of polyether triol GEP-330N, 8 parts of 4,4'-dicyclohexylmethane diisocyanate, 0.01 part of dibutyltin dilaurate, 2 parts of toluene.

[0051] The preparation method of the above-mentioned one-component moisture-curing polyurethane sealant with excellent weather resistance comprises the following steps:

[0052] The environment for producing and packaging the polyurethane sealant should be controlle...

Embodiment 2

[0056] This embodiment provides a one-component moisture-curing polyurethane sealant with excellent weather resistance. In terms of parts by mass, the polyurethane sealant includes 34.5 parts of polyurethane prepolymer, 0.8 part of toluenesulfonyl isocyanate, and 0.3 part of γ-shrinkage Glyceryl ether oxypropyl trimethoxysilane, 0.8 parts of LA-62, 0.5 parts of Irganox1098, 8 parts of titanium dioxide, 43 parts of polyvinyl chloride paste resin, 16 parts of hydrophobic fumed silica, 0.8 parts of dibutyltin dilaurate; Among them, 27 parts of polyurethane prepolymer polyether diol Tdiol-2000, 13 parts of polyether triol GEP-330N, 8 parts of 4,4'-dicyclohexylmethane diisocyanate, 0.01 part of dibutyltin dilaurate, 2 parts toluene.

[0057] The preparation method of the above-mentioned one-component moisture-curing polyurethane sealant with excellent weather resistance comprises the following steps:

[0058] The environment for producing and packaging the polyurethane sealant sho...

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Abstract

The invention discloses one-component moisture cured polyurethane sealant excellent in weather resistance and a preparation method thereof and relates to the field of moisture cured polyurethane sealant. The polyurethane sealant is prepared from, by mass, 20-50 parts of polyurethane prepolymers, 0.5-2 parts of water absorbing and stabilizing agents, 0.1-0.7 part of silane coupling agents, 0.1-1 part of light stabilizing agents, 0.1-1 part of antioxidant, 2-10 parts of titanium dioxide, 28-50 parts of polyurethane-used filling materials, 1-35 parts of thixotropic agents and 0.4-2 parts of first catalysts. According to the polyurethane sealant, the light stabilizing agents and the antioxidant are added, in the process of preparing the polyurethane prepolymers, alicyclic or cycloaliphatic isocyanate is used for replacing 4, 4'-diphenylmethane diisocyanate in the existing polyurethane prepolymers, and the polyurethane sealant is not prone to yellowing under ultraviolet irradiation for a long time, slow in mechanical performance degradation and suitable for being used for a long time.

Description

technical field [0001] The invention relates to the field of moisture-curing polyurethane sealants, in particular to a one-component moisture-curing polyurethane sealant with excellent weather resistance and a preparation method thereof. Background technique [0002] Since the mid-1970s, one-component moisture-curing polyurethane sealants have been more and more widely used in industries such as automobiles, construction, and rail transit due to their high elasticity, strong shock resistance, chemical corrosion resistance, and light weight. The external and internal sealing bonding. [0003] Although polyurethane stabilization technology has been developed, the UV resistance of polyurethane sealants can be improved by adding additives, but the existing one-component moisture-cured polyurethane sealants still have the following disadvantages: [0004] (1) Under the long-term irradiation of natural light and ultraviolet rays, the polyurethane sealant will turn yellow and affe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J11/04C09J11/06C09J11/08C08G18/48C08G18/10C09K3/10
Inventor 唐礼道韩胜利赵祖培刘鹏赵勇刚吴正明
Owner HUBEI HUITIAN NEW MATERIALS STOCK CO LTD
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