Preparation method for dyeable polyurethane film

A polyurethane film and polyurethane technology, which is applied in the field of polyurethane materials, can solve the problems of rare polyurethane dyeing effects, achieve the effects of improving dyeing rate and color fastness, easy operation, and strong color fastness

Active Publication Date: 2015-01-07
汕头市亮彩新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on improving the dyeing effect of polyurethane

Method used

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  • Preparation method for dyeable polyurethane film
  • Preparation method for dyeable polyurethane film
  • Preparation method for dyeable polyurethane film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Add N,N-methylenebisacrylamide (MBA) and diethylenetriamine (DETA) with a molar ratio of 1:1.1 to the solvent N,N-dimethylformamide (DMF), at 40 React at ℃ for 24 hours to obtain a yellow-green amino-terminated hyperbranched polymer; the mass ratio of the total mass of N,N-methylenebisacrylamide and diethylenetriamine to N,N-dimethylformamide is 1 : 1.1; The synthetic route and structural formula of amino-terminated hyperbranched polymer are as figure 1 shown.

[0032] 2) Add isophorone diisocyanate and absolute ethanol with a molar ratio of 1:1.1 into the solvent N,N-dimethylformamide, and react at 0°C for 4 hours to obtain a blocking agent, in which isophorone The mass ratio of the total mass of ketone diisocyanate and dehydrated alcohol to N,N-dimethylformamide is 1:1.1; the synthetic route of end-capping agent is as follows figure 2 shown.

[0033] 3) The amino-terminated hyperbranched polymer with a mass ratio of 3:0.5 is mixed with an end-capping agent, and...

Embodiment 2

[0037] 1) Add N,N-methylenebisacrylamide (MBA) and diethylenetriamine (DETA) with a molar ratio of 1:1.2 to the solvent N,N-dimethylformamide (DMF), at 80 React at ℃ for 8 hours to obtain a yellow-green amino-terminated hyperbranched polymer; the mass ratio of the total mass of N,N-methylenebisacrylamide and diethylenetriamine to N,N-dimethylformamide is 1 :1.2;

[0038] 2) Add isophorone diisocyanate and absolute ethanol with a molar ratio of 1:1.2 into the solvent N,N-dimethylformamide, and react at 10°C for 2.5 hours to obtain a blocking agent, in which isoflurane The mass ratio of the total mass of ketone diisocyanate and dehydrated alcohol to N,N-dimethylformamide is 1:1.2;

[0039] 3) The amino-terminated hyperbranched polymer with a mass ratio of 3:1 is mixed with an end-capping agent, and reacted at 65° C. for 3 hours to obtain an end-capped hyperbranched polymer.

[0040] 4) Add solvent N,N-dimethylformamide to the polyurethane raw material, stir evenly, and configu...

Embodiment 3

[0043] 1) Add N,N-methylenebisacrylamide (MBA) and diethylenetriamine (DETA) with a molar ratio of 1:1.3 to the solvent N,N-dimethylformamide (DMF), at 60 React at ℃ for 20 hours to obtain a yellow-green amino-terminated hyperbranched polymer; the mass ratio of the total mass of N,N-methylenebisacrylamide and diethylenetriamine to N,N-dimethylformamide is 1 :1.4;

[0044] 2) Add isophorone diisocyanate and absolute ethanol with a molar ratio of 1:1.3 into the solvent N,N-dimethylformamide, and react at 15°C for 2 hours to obtain a blocking agent, in which isophorone The mass ratio of the total mass of ketone diisocyanate and absolute ethanol to N,N-dimethylformamide is 1:1.3;

[0045] 3) The amino-terminated hyperbranched polymer with a mass ratio of 3:1.5 is mixed with an end-capping agent, and reacted at 70° C. for 2 hours to obtain an end-capped hyperbranched polymer.

[0046] 4) Add solvent N,N-dimethylformamide to the polyurethane raw material, stir evenly, and configur...

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Abstract

The invention discloses a preparation method for a dyeable polyurethane film. The preparation method comprises the following steps: firstly, adding N, N-methylene bisacrylamide and diethylenetriamine into N, N-dimethylformamide to prepare an amino-terminated hyperbranched polymer; terminating the obtained product by using ethanol terminated isophorone diisocyanate; then, adding the terminated product into an N, N-dimethylformamide solution of polyurethane to prepare a casting film solution; pouring the casting film solution on a substrate; dipping in a coagulating bath to form a film by a wet process; and drying to obtain the dyeable polyurethane film. According to the film prepared by the method, as an active group -NH2 is introduced into a component of the film, bonding points of the dye are increased. Moreover, in an acidic solution, the film has positive charges, so that an anionic dye is gradually bonded with amino (P-NH3+) with positive charges in the film by virtue of ionic bonds to play a dyeing effect, thereby improving the dyeing rate and the color fastness. Meanwhile, the method is simple, convenient and feasible to operate, low in requirements on equipment and easy for industrial popularization.

Description

technical field [0001] The invention belongs to the field of polyurethane materials, and in particular relates to a preparation method of a dyeable polyurethane film. Background technique [0002] Microfiber synthetic leather is a composite material of superfine fiber and PU elastomer developed in recent years. Because the microfiber has a fineness and structure similar to that of collagen fibers, the three-dimensional weaving highly imitates the leather structure, and has good mechanical properties, surpassing natural leather in terms of chemical resistance, water resistance, and mildew resistance. Microfiber synthetic leather has developed rapidly in recent years, but the dyeing of microfiber synthetic leather has always been considered a difficult problem by the industry. In actual production, the phenomenon of low genuine product rate due to uneven dyeing is very common. The main reason is: ultra-fine fiber has a large specific surface area, strong chemical adsorption c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L75/04C08L87/00C08G83/00
Inventor 任龙芳王娜郭子东强涛涛王学川
Owner 汕头市亮彩新材料科技有限公司
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