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Polyurethane elastic body material for silk-screen printing squeegee and preparation method thereof

A polyurethane elastomer and screen printing technology, applied in the field of polyurethane elastomer and its preparation, can solve the problems of long demoulding time, high viscosity of prepolymer, difficult operation process, etc., and achieve excellent solvent resistance and good resilience. Effect

Active Publication Date: 2013-12-04
LIMING RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when preparing medium-soft and hard materials, the prepolymer prepared by MDI has problems such as high viscosity, difficult operation process, long demoulding time of the material, and poor rebound performance of the product.

Method used

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  • Polyurethane elastic body material for silk-screen printing squeegee and preparation method thereof
  • Polyurethane elastic body material for silk-screen printing squeegee and preparation method thereof
  • Polyurethane elastic body material for silk-screen printing squeegee and preparation method thereof

Examples

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preparation example Construction

[0033] Preparation of polyester polyol PSE1-1: 2259g of succinic acid, 530g of terephthalic acid, 1270g of ethylene glycol, and 542g of diethylene glycol are added to a reactor with a condenser and a fractionating tower, and heated under nitrogen protection Stir, gradually raise the temperature to 220-230°C until no reaction-generated water distills out under normal pressure, carry out decompression and compression polymerization, and slowly increase the vacuum degree to -0.095MPa, heat preservation reaction until the acid value is qualified, then cool down to 100°C to exit material. The hydroxyl value of the prepared polyester polyol is 74.0 mgKOH / g, and the acid value is 0.5 mgKOH / g.

[0034] Preparation of polyester polyol PSE1-2: 2400 g of succinic acid, 422 g of phthalic acid, 1390 g of ethylene glycol, and 388 g of neopentyl glycol. The hydroxyl value of the prepared polyester polyol is 75.0 mgKOH / g, and the acid value is 0.8 mgKOH / g. Other operations are the same as P...

Embodiment 1

[0036] Preparation of component A: 1-1100 parts of polyester polyol PSE, 110 parts of MDI, react at 80°C for 1.5h, vacuumize and defoam, cool down to 50°C and discharge to obtain component A.

[0037] Preparation of component B: after dehydration of polyester polyol PSE2, component B is obtained.

[0038] Preparation of component C: Mix 100 parts of 1,4-butanediol and 8.3 parts of Dabco33-LV / T-9 (mass ratio 6 / 1) to obtain component C.

[0039] Control the temperature of component A at 80-90°C, the temperature of components B and C within the range of 40-50°C, adjust the proportion of components A, B, and C to 100 / 160 / 10.5, and mix the three components thoroughly , injected into a 4mm mold for molding, the mold temperature is 100°C, demolded in 40 minutes, vulcanized at 100°C for 24 hours, and tested for performance after 7 days at room temperature. Product properties are shown in Table 2.

Embodiment 2

[0041] Preparation of component A: 1-2100 parts of polyester polyol PSE, 120 parts of MDI, react at 80°C for 1.5h, defoam in vacuum, cool down to 50°C and discharge to obtain component A.

[0042] Preparation of component B: after dehydration of polyester polyol PSE2, component B is obtained.

[0043] Preparation of component C: Mix 100 parts of 1,4-butanediol and 5 parts of Dabco33-LV / T-9 (mass ratio 6 / 1) to obtain component C.

[0044]Control the temperature of component A at 80-90°C, the temperature of components B and C within the range of 40-50°C, adjust the proportion of components A, B, and C to 100 / 115 / 12, and mix the three components thoroughly , injected into a 4mm mold for molding, the mold temperature is 100°C, demolded in 40 minutes, vulcanized at 100°C for 24 hours, and tested for performance after 7 days at room temperature. Product properties are shown in Table 2.

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Abstract

The invention discloses a polyurethane elastic body material for silk-screen printing squeegee and a preparation method thereof. The raw material of the elastic body material comprises three components: component A which comprises 100 parts of polyester polyatomic alcohol PSE 1 and 110-120 parts of isocyanate, component B which comprises polyester polyatomic alcohol PSE 2, and component C which comprises 100 parts of chain extendor, 3.3-8.3 parts of catalyst, wherein the mass ratio of the A:B:C is 100 / 85-160 / 10.5-13.5; the polyester polyatomic alcohol PSE 1 is obtained through polycondensation reaction of the mixed dibasic acid and mixed polyatomic alcohol; the polyester polyatomic alcohol PSE 2 is obtained through polycondensation reaction of the dibasic acid and mixed polyatomic alcohol. Through adjusting the ratio of the three components, the polyurethane elastic body material, which has the Shore hardness of 60-90 A, the material has the advantages of excellent solvent resistance, good resilience performance, wearing resistance, bending resistance, and good mechanical property and cutting processing behavior.

Description

technical field [0001] The invention relates to a polyurethane elastomer mainly used for screen printing squeegee (also called screen printing squeegee) and a preparation method. Background technique [0002] Screen printing technology is widely used in the printing of advertising pictures, clothing, ceramics, glass, metal, and plastic products. Elastic materials are usually used as squeegees, which can be divided into four types: soft, medium, hard, and extra hard. The hardness range is 55~ 95A. Screen printing squeegee has high requirements on the solvent resistance of the material, but ordinary polyurethane materials are resistant to weak polar solvents, but poor in polar solvents, especially in ketone solvents, soaked for 24 hours, the weight change rate exceeds 50%, and It becomes brittle quickly, loses its elasticity, and has a short service life. [0003] Solvent-resistant polyurethane elastomers generally consist of polyol components and isocyanate components. At ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/42C08G18/10C08L75/06
Inventor 郑直韦永继潘洪波石雅琳李黎宇姚庆伦
Owner LIMING RES INST OF CHEM IND
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