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A casting type polyurethane elastomer semi-prepolymer for producing screen printing squeegee

A polyurethane elastomer and screen printing technology, applied in the field of polyurethane elastomer materials, can solve the problems of narrow adjustable range of hardness, difficulty in preparing large-scale structures, large investment in production equipment, etc., to achieve a large adjustable range of hardness and reduce raw material inventory , the effect of long gel time

Active Publication Date: 2020-07-14
BMP ASIA IND (SHENZHEN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has high prepolymer viscosity, short gel time (especially when producing high-hardness products), large investment in production equipment (requires high-temperature pouring machine to operate at high temperature), and is difficult to prepare large-scale and complex products. Disadvantages such as narrow adjustable range of hardness of the system

Method used

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  • A casting type polyurethane elastomer semi-prepolymer for producing screen printing squeegee

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0062] The preparation method of the polyester polyol with special molecular structure is as follows: Add dibasic acid monomer, small molecular diol and trace catalyst into the reactor, heat up to 140°C to start dehydration, slowly raise the temperature to 220°C, control the fractionation tower The top temperature is less than 103°C. After most of the by-product water is evaporated, the temperature is controlled at 220-230°C for 2 hours, and the acid value is tested by sampling. After the acid value is reduced to less than 30mg KOH / g, turn on the vacuum pump to evacuate , and gradually increase the vacuum degree to remove a small amount of water and excess polyol to reduce the acid value to generate polyester polyol with target molecular weight. When the acid value is 1.5-1.0mg KOH / g, control the temperature at 180-200°C. Add a small amount of epoxy resin E51, continue the reaction, and stop the reaction after the acid value is less than 0.5mg KOH / g.

[0063] The carbodiimide ...

Embodiment approach

[0083] As an embodiment of the present invention, the screen printing squeegee has a density of 1.1 g / cm 3 -1.30g / cm 3 of polyurethane elastomers.

[0084] The fourth aspect of the present invention provides the preparation method of described screen printing squeegee as follows:

[0085] a) Stir the hardener component and the polyol component and mix them evenly;

[0086]b) According to the equivalent ratio of OH / NCO of 0.85-1.0, step a) is mixed with the isocyanate semi-prepolymer component, centrifugally poured, and vulcanized. After vulcanizing in a centrifuge for 1 hour at 100°C, demoulding, then secondary vulcanization at 90-100°C for 8-12 hours, and cutting, the screen printing squeegee can be obtained.

[0087] Mechanism Explanation: This invention adopts a unique preparation process. When using succinic acid to synthesize polyester polyol, it is difficult to reduce the acid value in the later stage. It is difficult to reduce the acid value to below 0.5, or the prod...

Embodiment approach 1

[0088] Embodiment 1: This embodiment provides a castable polyurethane elastomer semi-prepolymer for producing screen printing squeegee, and its preparation raw materials include three parts:

[0089] Isocyanate semi-prepolymer component: an isocyanate semi-prepolymer with an NCO content of 10%-25%, and a viscosity of 1000-5000mPa.s;

[0090] Polyol component: a mixture of polyester polyols added with catalysts, defoamers, colorants, and wear-resistant agents, and the number average molecular weight of the polyester polyols is 1000-4000;

[0091] Hardener component: The hardener component is composed of small molecular polyol or alcohol amine.

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Abstract

The invention discloses a pouring-type polyurethane elastomer semi-prepolymer used for producing silk screen printing squeegees. Preparation raw materials of the semi-prepolymer comprise the following three parts: an isocyanate semi-prepolymer component, a polyhydric alcohol component, and a hardener component, wherein the NCO content of the isocyanate semi-prepolymer is 10%-25%, and the viscosity of the isocyanate semi-prepolymer is 1000-5000mPa.s; the polyhydric alcohols is a mixture of polyester polyols to which a catalyst, an antifoaming agent, color paste, and an abrasion-resistant agent are added, and the number-average molecular weight of the polyester polyol is 1000-4000; and the hardener component is composed of small molecule polyhydric alcohols or alkylol amine.

Description

technical field [0001] The invention relates to the field of polyurethane elastomer materials, and mainly relates to a formula and a preparation method of a casting type polyurethane elastomer semi-prepolymer system specially used for producing screen printing squeegee. [0002] technical background [0003] Screen printing belongs to stencil printing. Together with lithographic printing, letterpress printing and gravure printing, it is called the four major printing methods. It is known as "universal printing" because of its wide range of substrates. It has strong printing adaptability and simple process. , low investment and quick returns, and easy mass production are widely used in light industry, textiles, advertising, packaging, electronics, automobiles, chemicals, construction and many other fields, and are closely related to our daily life. [0004] Screen printing is to use the basic principle that the graphic part of the screen printing plate is opened to allow ink t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/73C08G18/66C08G18/42C08G18/32C08G18/10
CPCC08G18/10C08G18/425C08G18/4294C08G18/73C08G18/7671C08G18/6644C08G18/6655C08G18/42C08G18/3206C08G18/3281
Inventor 王钦菲利普·克莱格
Owner BMP ASIA IND (SHENZHEN) CO LTD
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