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Process for preparing high solid single component polyurethane elastor and its use

A polyurethane elastomer, high-solid technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problem of reducing the hardness, tensile strength and elongation of the coating, affecting the decorative and mechanical properties of the coating, and requiring a large investment. and other problems, to achieve the effect of excellent wetting and dispersing performance

Inactive Publication Date: 2005-03-02
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the CO2 gas produced by the reaction during moisture curing is easy to remain in the coating, which affects the decorative and mechanical properties of the coating, especially for thick coatings, the impact on performance is particularly obvious, greatly reducing the hardness and tensile properties of the coating. Tensile strength and elongation, so the application of terminal NCO one-component moisture-curing PU resin on elastomer materials is limited
In addition, in order to achieve the emission limit of VOC (organic volatile matter) and the limit index of free toluene diisocyanate (hereinafter referred to as m-TDI) in polyurethane coatings, the direct synthesis method is usually used to reduce m-TDI, which has certain limitations. , and the investment in the thin film evaporation method is too large, which also limits the application of solvent-based NCO-based one-component moisture-curing polyurethane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] In the 500ml round-bottomed flask that agitator, thermometer, condenser tube are housed with vacuum dehydration device, add hydroxyl value 80KOH / g, molecular weight is 80 grams of polyether trihydric alcohols of 3000, hydroxyl value 100KOH / g, 160 grams of polyester diol with a molecular weight of 2000, heat up to 100°C, vacuum dehydrate for 1 hour under stirring, cool down to 50°C, add 50 grams of toluene diisocyanate, 15 grams of xylene, 0.06 grams of catalyst, and heat up to 80-90 React for 3-4 hours under the protection of nitrogen at ℃, measure the NCO content with di-n-butylamine titration method, until the NCO content remains basically unchanged, cool down to 40 ℃, add 8 grams of aminopropyltrimethoxysilane coupling agent dropwise , After reacting at 60°C for 2 hours, measure the NCO content and discharge.

example 2

[0030] In the 500ml round-bottomed flask that agitator, thermometer, condenser are housed with vacuum dehydration device, add hydroxyl value 60KOH / g, molecular weight is 60 grams of epoxy glycols of 1000, hydroxyl value 200KOH / g, 120 grams of polyester diol with a molecular weight of 2000, heated to 100°C, vacuum dehydrated for 1 hour under stirring, cooled to 50°C, added 4.35 grams of isocyanate propylethoxysilane, 10 grams of toluene and butyl acetate solvent and heated to 70-90°C, react under nitrogen protection for 1 hour, add 30 grams of diphenylmethane diisocyanate to continue the reaction for 3-4 hours, measure the NCO content with di-n-butylamine titration, until the NCO content remains basically unchanged, cool down to At 50°C, add 1.99 g of mercaptopropyltrimethoxysilane dropwise, react at 100°C for 2 hours, measure the NCO content, and discharge the mixture.

example 3

[0032] In the 500ml round-bottomed flask equipped with agitator, thermometer and condenser with vacuum dehydration device, add 40 grams of neopentyl glycol, 120 grams of polytetrahydrofuran ethers with a hydroxyl value of 100KOH / g and a molecular weight of 1000, and heat up to 100°C, vacuum dehydration for 1 hour under stirring, lower the temperature to 50°C, add 30 grams of 1,6-ethylene diisocyanate, 5 grams of butyl acetate and methyl pentanone, 0.08 grams of catalyst, and heat up to 80-90°C under nitrogen protection React at low temperature for 3-4 hours, measure the NCO content with di-n-butylamine titration method, until the NCO content remains basically unchanged, cool down to 40°C, add 0.2 g of cyclohexyl-aminopropylmethyldimethoxysilane dropwise, After reacting at 80°C for 2 hours, the NCO content was measured and the material was discharged.

[0033] performance:

[0034] Example 1-3 made a colorless to light yellow transparent viscous liquid, solid content ≥ 90%, at...

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Abstract

The polyurethane is prepared through the reaction between polyol and isocyanate and siloxane modification. The preparation process includes first synthesis of polyurethane prepolymer with end isocyanic radical and the subsequent modification with siloxane, or includes first synthesis of polyurethane prepolymer containing end isocyanic radical with siloxane containing isocyanate and the subsequent modification with siloxane containing active hydrogen. The modified polymer may be produced into paint film of 2-3 mm thickness, shore A hardness not lower than 60, elongation at rupture not smaller than 300 %, stretching strength not lower than 3 MPa and stable storage period of 3-6 months. The present invention is applied in making elastic polyurethane coating.

Description

technical field [0001] The invention relates to the field of chemical industry, and relates to a preparation method and application of a high solid content single-component polyurethane elastomer. Background technique [0002] At present, it is generally used to react diisocyanate with polyester or polyether polyol to make isocyanate-terminated (hereinafter referred to as NCO) one-component moisture-curing polyurethane (hereinafter referred to as PU) resin, through the terminal NCO group contained in the polyurethane prepolymer and Moisture in the air reacts to form urea bonds for curing. Generally, high-solid polyurethane resins are mainly used in the fields of adhesives and foaming, pouring and other elastic materials that do not require high construction viscosity. However, for the requirements of construction viscosity and performance in the field of varnishes and coatings, currently used in this field alone The solid content of the component moisture-curing polyurethan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/24C08G18/50C08G18/76C09D175/04
Inventor 武利民方红霞游波
Owner FUDAN UNIV
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