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Transparent polyurethane elastomer and preparation method as well as application

A technology of polyurethane elastomer and polyurethane elasticity, which is applied in the material and preparation of polyether polyurethane (urethane) elastomer, and the application field of cleaning blades, which can solve the problems of low rebound temperature dependence, high impact rebound, high Tear strength and other issues, to achieve the effect of excellent mechanical properties, high rebound, high hardness

Active Publication Date: 2013-11-06
GUANGDONG LEPUTAI NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the printer cleaning blade synthesized in the above materials can only meet the mechanical properties, or meet the individual mechanical properties under the condition of satisfying the optical properties, and cannot simultaneously meet the requirements of high transparency, high impact resilience, and high tensile strength under the conditions of satisfying the optical properties. Mechanical properties such as tensile strength, high tear strength and low temperature dependence of rebound

Method used

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  • Transparent polyurethane elastomer and preparation method as well as application
  • Transparent polyurethane elastomer and preparation method as well as application
  • Transparent polyurethane elastomer and preparation method as well as application

Examples

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preparation example Construction

[0039] The above-mentioned transparent polyurethane elastomer preparation method comprises the following steps:

[0040] (1) Preparation of isocyanate prepolymer:

[0041] Add 30-60% diphenylmethane diisocyanate and 40-70% polytetrahydrofuran polyol to the reaction kettle in sequence, stir evenly, heat and react to obtain an isocyanate prepolymer with an isocyanate content of 10-18%;

[0042] (2) Preparation of polyol polymer:

[0043] Add 20-70% polytetrahydrofuran polyol and 30-80% small molecule diol chain extender into the reaction kettle in sequence, stir at a set speed, and dehydrate under a certain temperature and pressure to obtain polyol polymerization thing;

[0044] (3) Preparation of transparent polyurethane elastomer:

[0045] Mix 60-90% of the isocyanate prepolymer and 10-40% polyol polymer prepared in step (1) and step (2) evenly, defoam, then enter the mold for casting and cooling, and you can get a hardness of 65-85 Asker A. Transparent polyurethane with t...

Embodiment 1

[0053] (1) Preparation of isocyanate prepolymer:

[0054] Add 42.90g of diphenylmethane diisocyanate (containing 95% of 4,4 and 5% of 2,4) and 57.10g of polytetrahydrofuran polyol (molecular weight 2000) into the reaction kettle and stir evenly (stirring speed is 150 ~300rpm), the temperature was raised to 80°C, and the reaction was carried out for 1.5h to obtain a prepolymer with an isocyanate content of 12%.

[0055] (2) Polyol polymer preparation:

[0056] Add 29.40g of polytetrahydrofuran polyol (molecular weight: 2000), 63.2g of 1,6-hexanediol and 37.9g ​​of diethylene glycol into the reaction kettle in sequence, stir (stirring speed is 200-300rpm) to mix uniformly, and heat up to 100- At 120°C, start the vacuum device, control the pressure inside the reactor at -0.095MPa~-0.098MPa, and dehydrate for about 2 hours to obtain a polyol polymer.

[0057] (3) Cleaning scraper preparation process:

[0058] Preheat the isocyanate prepolymer and polyol polymer prepared in step...

Embodiment 2

[0061] (1) Preparation of isocyanate prepolymer:

[0062] Add 58.80g of diphenylmethane diisocyanate (containing 95% of 4,4 and 5% of 2,4) and 41.20g of polytetrahydrofuran polyol (molecular weight 1000) into the reaction kettle and stir evenly (stirring speed is 150 ~300rpm), the temperature was raised to 80°C, and the reaction was carried out for 1.5h to obtain a prepolymer with an isocyanate content of 18%.

[0063] (2) Polyol polymer preparation:

[0064] together with the examples.

[0065] (3) Cleaning scraper preparation process:

[0066] Preheat the isocyanate prepolymer and polyol polymer prepared in steps (1) and (2) to 80°C and mix and stir at a weight ratio of 60:40 (stirring speed 200-300rpm), vacuum defoaming, pour 130 After about 1 hour of vulcanization in the mold at ℃, demould, and secondary curing in an oven at 100 ℃ for more than 4 hours.

[0067] The prepared cleaning blade has excellent optical and mechanical properties, see Table 1 for details.

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Abstract

The invention provides a transparent polyurethane elastomer, which contains the following components in percentage by weight: 60-90 percent of structurally symmetric cyanate ester prepolymer and 10-40 percent of chain extender, wherein the structurally symmetric cyanate ester prepolymer is obtained by reacting 30-60 percent of isocyanate or a derivative thereof and 40-70 percent of polyol polymer; and the chain extender is obtained by mixing 20-70 percent of polyol polymer and 30-80 percent of small molecular glycol type chain extender. The invention also provides a preparation method of the transparent polyurethane elastomer. The polyurethane elastomer prepared by the invention is colorless and transparent, the hardness is 65-85 Asker A, the tensile strength is greater than 30 MPa, the fracture productivity is greater than 400 percent, the tear strength is greater than 50 kN / m, the resilience rate is greater than 50 percent, the resilience temperature dependency is less than 30 percent, and the permanent deformation at definite elongation is less than 3 percent. The transparent polyurethane elastomer is mainly used for cleaning scrapers in a printer or other electronic photographic equipment.

Description

【Technical field】 [0001] The invention relates to the field of materials for printers, in particular to a polyether polyurethane (urethane) elastomer material, a preparation method and the application of the material to cleaning blades in printers and other electrophotographic equipment. 【Background technique】 [0002] see figure 2 , In the working process of printers and other electrophotographic equipment, in order to repeatedly use the electrophotographic photoreceptor or transfer, etc., a cleaning blade is usually used to remove the toner on the toner image carrier. Since this cleaning blade needs to be pressed on the surface of the toner drum for a long time to work, the cleaning blade has the following basic requirements: colorless and transparent, good tensile tearing performance and good wear resistance. The use of polyurethane as a cleaning blade is due to the good wear resistance of polyurethane. However, polyurethanes with better tensile tear properties are gene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/32C08G18/10C08L75/08
Inventor 孙变张海清韩昌哲
Owner GUANGDONG LEPUTAI NEW MATERIAL TECH