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Preparation method of light-resistant MDI (diphenyl-methane-diisocyanate) polyurethane

A technology of polyurethane and light resistance, which is applied in the field of preparation of light resistance MDI type polyurethane, to achieve the effect of reducing color difference change and gloss change, improving dispersion and improving mechanical property retention rate

Inactive Publication Date: 2013-02-13
上海井上高分子制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a preparation method of light fastness MDI type polyurethane to solve the problem that the current MDI type polyurethane light fastness is not good enough

Method used

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  • Preparation method of light-resistant MDI (diphenyl-methane-diisocyanate) polyurethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1: Preparation of surface-modified nano-ZnO:

[0023] Weigh 0.01 parts by mass of γ-aminopropyltrimethoxysilane coupling agent and dissolve it in 50 parts by mass of toluene, then add 2 parts by mass of nano-ZnO, stir at a constant speed for 20 min, then sonicate for 10 min, then reflux and stir 6 h; followed by centrifugation, the centrifuged precipitate was placed in ethanol for Soxhlet extraction for 6 h, and dried under low pressure at 100 °C for 12 h to obtain modified nano-ZnO.

[0024] Step 2: Preparation of light-resistant MDI polyurethane:

[0025] Take N,N-dimethylformamide: a mixture of butyl acetate with a mass ratio of 3:1 as solvent and solid MDI polyurethane as solute to prepare a polyurethane solution with a mass fraction of 10%; then add 1 part by mass The modified nano-ZnO and 0.1 mass part of organic anti-aging agent were stirred at 1000 rpm for 1 h, and then vacuum pumped to coat the film and dried at 100 °C for 6 h to obtain the light-resistan...

Embodiment 2

[0029] Step 1: Preparation of surface-modified nano-ZnO:

[0030] Weigh 0.03 parts by mass of γ-aminopropyltriethoxysilane coupling agent and dissolve it in 100 parts by mass of toluene, then add 4 parts by mass of nano-ZnO, stir at a constant speed for 20 min, then sonicate for 20 min, and then reflux Stir for 12 h; then perform centrifugation, place the centrifuged precipitate in ethanol for Soxhlet extraction for 12 h, and dry under low pressure at 100 °C for 12 h to obtain modified nano-ZnO.

[0031] Step 2: Preparation of light-resistant MDI polyurethane:

[0032] Take N,N-dimethylformamide: a mixture of butyl acetate with a mass ratio of 3:1 as solvent and solid MDI polyurethane as solute to prepare a polyurethane solution with a mass fraction of 15%; then add 2 parts by mass The modified nano-ZnO and 0.5 parts by mass of organic anti-aging agent were stirred at 1000 rpm for 2 h, and then vacuum pumped to coat the film and dried at 100 °C for 12 h to obtain the light-re...

Embodiment 3

[0036] Step 1: Preparation of surface-modified nano-ZnO:

[0037]Weigh 0.05 parts by mass of 3-isocyanatopropyltrimethoxysilane coupling agent and dissolve it in 200 parts by mass of toluene, then add 6 parts by mass of nano-ZnO, stir at a constant speed for 60 minutes, then ultrasonicate for 60 minutes, and then reflux Stir for 24 h; then perform centrifugation, place the centrifuged precipitate in ethanol for Soxhlet extraction for 12 h, and dry under low pressure at 100 °C for 12 h to obtain modified nano-ZnO.

[0038] Step 2: Preparation of light-resistant MDI polyurethane:

[0039] Use the mixture of N,N-dimethylformamide: butyl acetate with a mass ratio of 3:1 as solvent and solid MDI polyurethane as solute to prepare a polyurethane solution with a mass fraction of 10%-30%; then add 6 parts by mass of modified nano-ZnO and 1 part by mass of organic anti-aging agent, stirred at 2000 rpm for 4 h, then vacuum pumped, and then dried for 6 h at 100 ° C to obtain the light-re...

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Abstract

According to the invention, a light-resistant MDI (diphenyl-methane-diisocyanate) polyurethane material is prepared by compounding MDI polyurethane, a coupling agent modified nano ZnO and organic anti-aging auxiliary. By adopting the coupling agent modified nano ZnO, the agglomeration phenomenon of the nano particles is reduced, and the dispersibility of nano ZnO and the compatibility with polyurethane are improved. The nano ZnO particle and the organic anti-aging auxiliary are in an excellent synergic effect; and by adding the modified nano ZnO and the organic anti-aging auxiliary, the chromatic aberration change and the gloss change of the MDI polyurethane are reduced, the mechanical performance retention rate is improved, and an unexpected beneficial technical effect is realized. Through the invention, the prepared MDI polyurethane has excellent anti-UV (ultraviolet) light aging performance, and the problem of low light resistance of the existing MDI polyurethane is solved.

Description

technical field [0001] The invention relates to the field of polymer nanomaterials, in particular to a method for preparing light-resistant MDI polyurethane. Background technique [0002] Polyurethane is a high-performance resin formed by gradual polymerization of isocyanate and polyol as the main raw materials. It can be made into foam plastics, elastomers, coatings, adhesives, fibers, synthetic leather and other products. It is widely used in electromechanical, civil engineering and construction. , vehicles, aviation and light industry sectors. Among them, isocyanates are divided into three categories: aliphatic, alicyclic and aromatic. The polyurethane synthesized from aromatic isocyanate contains rigid aromatic rings, and its mechanical properties are better than those prepared from aliphatic and alicyclic isocyanates. There is also a big advantage in terms of price. At present, most polyurethane materials are made of aromatic diisocyanate TDI, MDI and aromatic polyisoc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/04C08K13/06C08K9/06C08K9/04C08K3/22
Inventor 王全杰牟宗波苏立清
Owner 上海井上高分子制品有限公司
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