Method for preparing photo-crosslinking polyurethane film

A polyurethane film and photocrosslinking technology, applied in the field of polyurethane, can solve problems such as low performance, and achieve the effects of convenient operation, good comprehensive performance and simple operation

Inactive Publication Date: 2017-05-31
SHAANXI QIYUAN TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many research reports on nano-silica composite modified UV-cured water-based polyurethane emulsion or photo-cured UV-cured water-based polyurethane system, but the effect of polyether soft segment on photo-cured UV-cured water-based polyurethane / silica There are few research reports on the influence of nanocomposite emulsion properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The preparation method of photocrosslinked polyurethane film of the present invention comprises the following steps:

[0016] In the first step, add 24.5g of isophorone diisocyanate and 4 drops of catalyst into a 250ml four-neck bottle, add 57.1g of polyether polyol into the dropping funnel, and add dropwise, the temperature is controlled at 40-50 degrees, and the reaction 1-1.5h, use the di-n-butylamine method to measure the NCO content, add 3.75g of 2,2-bismethylol propionic acid when the NCO content reaches the requirement, the reaction temperature is 60-70 degrees, and the reaction is 2-3h. When the NCO content is close to the theoretical value, add 3.47g of 2-hydroxyethyl methacrylate and polymerization inhibitor dropwise and raise the temperature to 70 degrees, react for 3-4 hours, take samples for infrared detection, and wait until the NCO group characteristic peak disappears, Obtain polyurethane prepolymer;

[0017] In the second step, take the prepolymer and p...

Embodiment 2

[0020] The preparation method of photocrosslinked polyurethane film of the present invention comprises the following steps:

[0021] In the first step, add 24.5g of isophorone diisocyanate and 4 drops of catalyst into a 250ml four-neck bottle, add 57.1g of polyether polyol into the dropping funnel, and add dropwise, the temperature is controlled at 40-50 degrees, and the reaction 1-1.5h, use the di-n-butylamine method to measure the NCO content, add 3.75g of 2,2-bismethylol propionic acid when the NCO content reaches the requirement, the reaction temperature is 60-70 degrees, and the reaction is 2-3h. When the NCO content is close to the theoretical value, add 3.47g of 2-hydroxyethyl methacrylate and polymerization inhibitor dropwise and raise the temperature to 70 degrees, react for 3-4 hours, take samples for infrared detection, and wait until the NCO group characteristic peak disappears, Obtain polyurethane prepolymer;

[0022] In the second step, take the prepolymer and p...

Embodiment 3

[0026] The preparation method of photocrosslinked polyurethane film of the present invention comprises the following steps:

[0027] In the first step, add 24.5g of isophorone diisocyanate and 4 drops of catalyst into a 250ml four-neck bottle, add 57.1g of polyether polyol into the dropping funnel, and add dropwise, the temperature is controlled at 40-50 degrees, and the reaction 1-1.5h, use the di-n-butylamine method to measure the NCO content, add 3.75g of 2,2-bismethylol propionic acid when the NCO content reaches the requirement, the reaction temperature is 60-70 degrees, and the reaction is 2-3h. When the NCO content is close to the theoretical value, add 3.47g of 2-hydroxyethyl methacrylate and polymerization inhibitor dropwise and raise the temperature to 70 degrees, react for 3-4 hours, take samples for infrared detection, and wait until the NCO group characteristic peak disappears, Obtain polyurethane prepolymer;

[0028] In the second step, take the prepolymer and p...

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PUM

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Abstract

The invention relates to the field of polyurethane and particularly relates to a method for preparing a photo-crosslinking polyurethane film. The method comprises the following steps: adding 24.5g of isophorone diisocyanate and 4 droplets of catalyst into a 250ml four-mouthed bottle, adding 57.1g of polyether polyol into a dropping funnel, carrying out dropwise adding, carrying out a reaction for 1 to 1.5 hours while controlling the temperature to 40 DEG C to 50 DEG C, measuring NCO content by a di-n-butylamine method, adding 3.75g of 2,2-bishydroxymethyl propionate after the NCO content meets requirements, carrying out a reaction for 2 to 3 hours at the reaction temperature of 60 DEG C to 70 DEG C, dropwise adding 3.47g of hydroxyl-2-ethyl methacrylate and a polymerization inhibitor when the NCO content is approximate to a theoretical value, heating the temperature to 70 DEG C, carrying out a reaction for 3 to 4 hours, carrying out sampling, carrying out infrared detection, and obtaining a polyurethane prepolymer when characteristic peaks of an NCO group disappear; loading the prepolymer into a four-mouthed flask, adding triethylamine into the four-mouthed flask according to the mole ratio of 1: 1 in a dropwise adding manner, and carrying out a neutralization reaction for 0.5 to 1 hour at the temperature of 50 DEG C, thereby obtaining a composite nano-emulsion. According to the method, the operation is simple, the operation is convenient, the comprehensive performance of the product is good, and the method is efficient, energy-saving, environmentally friendly, safe and sanitary.

Description

technical field [0001] The invention relates to the field of polyurethane, in particular to a preparation method of a photocrosslinked polyurethane film. Background technique [0002] In recent years, UV-curable water-based polyurethane emulsion has the advantages of good comprehensive performance, high efficiency, energy saving, environmental protection, safety and hygiene, and has been well promoted and applied in the fields of coatings and adhesives. However, the mechanical properties (strength, modulus) of photo-crosslinked latex films are still not comparable to those of traditional cross-linked polyurethanes, thus limiting the wide application of the coating film. [0003] Light-curing organic-inorganic nanocomposite emulsion combines water-based technology, nanotechnology and photocuring technology, and integrates the characteristics of organic, inorganic and nanomaterials. It is a very promising method for preparing high-performance and functional emulsions. widespr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F299/06C08F2/48C08F2/44C08K3/36C08G18/75C08G18/66C08G18/67C08G18/48C08G18/34
CPCC08F299/065C08F2/44C08F2/48C08G18/6692C08G18/672C08G18/755C08J5/18C08J2355/00C08K3/36C08K2201/011
Inventor 张淑芬
Owner SHAANXI QIYUAN TECH DEV
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