Preparation method of wear-resistant polyurethane elastomer for polyurethane screen

A technology of polyurethane elasticity and polyurethane, which is applied in the field of preparation of wear-resistant polyurethane elastomers for polyurethane screens, can solve the problems of shortened life of polyurethane screens, increased wear, and increased temperature, and achieves enhanced elastic deformation, increased tensile strength, and improved The effect of abrasion resistance

Inactive Publication Date: 2020-05-19
界首万昌新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing technology "A production process of polyurethane screen, application number 201510527860.5, the present invention relates to a production process of polyurethane screen, including the following steps: (1), raw material preparation; (2), processing of metal skeleton, spraying Sand and brushing adhesive; (3), using polyurethane pouring; the production process of the polyurethane screen provided by the present invention improves the uniformity of polymerization by treating the polyurethane prepolymer and curing agent before pouring, During the polymerization, the polyurethane at each position is uniformly polymerized, so as to prevent the overall stability of the screen from being reduced due to local defects. The phenomenon of polyurethane and metal skeleton falling off caused by uneven resistance to cold and heat shocks". The molecular chains are slightly cross-linked. As the temperature increases or decreases, the two cross-linked structures are reversible, which leads to a large amount of heat due to friction during the high-strength screening of the prepared polyurethane screen. Increased temperature will reduce crosslinking, which will lead to increased wear and reduced life of polyurethane screens

Method used

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  • Preparation method of wear-resistant polyurethane elastomer for polyurethane screen
  • Preparation method of wear-resistant polyurethane elastomer for polyurethane screen
  • Preparation method of wear-resistant polyurethane elastomer for polyurethane screen

Examples

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Effect test

Embodiment 1

[0022] A method for preparing wear-resistant polyurethane elastomers for polyurethane screens. Mix 1,4-cyclohexyl-diisocyanate and polytetrahydrofuran into a reaction kettle, stir at a speed of 200r / min for 10min, then add epoxy, and heat To 60°C, stir and react at 200r / min for 0.5 hours, then add dibutyltin dilaurate, and perform ultrasonic treatment for 15 minutes, the ultrasonic frequency is 30kHz, power is 550W, and then continue to react for 1.5 hours, after standing for 10 minutes Then add a chain extender, adjust the temperature to 70°C, and carry out the chain extension reaction for 2 hours, that is, the chain extender is 2-methyl-1,3-propanediol, and the 2-methyl-1,3-propanediol The mass ratio to 4,4-diphenylmethane diisocyanate is 5:1. The mixing mass ratio of the 4,4-diphenylmethane diisocyanate and polytetrahydrofuran is 5:1, the molar ratio of the epoxide to the 4,4-diphenylmethane diisocyanate is 1:10, and the dilaurate The molar ratio of dibutyltin dibutyltin t...

Embodiment 2

[0024] A method for preparing wear-resistant polyurethane elastomers for polyurethane screens. Mix 1,4-cyclohexyl-diisocyanate and polytetrahydrofuran into a reaction kettle, stir at a speed of 200r / min for 10min, then add epoxy, and heat To 64°C, stir and react at 200r / min for 0.5 hours, then add dibutyltin dilaurate, and perform ultrasonic treatment for 20min. Then add a chain extender, adjust the temperature to 75°C, and carry out the chain extension reaction for 2 hours, that is, the chain extender is 2-methyl-1,3-propanediol, and the 2-methyl-1,3-propanediol The mass ratio to 4,4-diphenylmethane diisocyanate is 5:1. The mixing mass ratio of the 4,4-diphenylmethane diisocyanate and polytetrahydrofuran is 5:1.5, the molar ratio of the epoxide to the 4,4-diphenylmethane diisocyanate is 1:13, and the dilaurate The molar ratio of dibutyltin dibutyltin to polytetrahydrofuran is 25:1. The epoxide is propylene oxide.

Embodiment 3

[0026] A method for preparing wear-resistant polyurethane elastomers for polyurethane screens. Mix 1,4-cyclohexyl-diisocyanate and polytetrahydrofuran into a reaction kettle, stir at a speed of 200r / min for 10min, then add epoxy, and heat To 62°C, stir and react at 200r / min for 0.5 hours, then add dibutyltin dilaurate, and perform ultrasonic treatment for 18min, the ultrasonic frequency is 30kHz, power is 550W, then continue to react for 1.6 hours, after standing for 10min Then add a chain extender, adjust the temperature to 72°C, and carry out the chain extension reaction for 2 hours, that is, the chain extender is 2-methyl-1,3-propanediol, and the 2-methyl-1,3-propanediol The mass ratio to 4,4-diphenylmethane diisocyanate is 5:1. The mixing mass ratio of the 4,4-diphenylmethane diisocyanate and polytetrahydrofuran is 5:1.2, the molar ratio of the epoxide to the 4,4-diphenylmethane diisocyanate is 1:12, and the dilaurate The molar ratio of dibutyltin dibutyltin to polytetrah...

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Abstract

The invention discloses a preparation method of a wear-resistant polyurethane elastomer for a polyurethane screen. The invention relates to the technical field of polyurethane screens. The preparationmethod comprises the following steps: mixing and adding 1, 4-cyclohexyl-diisocyanate and polytetrahydrofuran into a reaction kettle, stirring at a rotating speed, adding epoxide, carrying out heating, stirring for reaction, adding dibutyltin dilaurate, carrying out ultrasonic treatment, continuing reacting, standing, adding a chain extender, regulating the temperature, and carrying out chain extension reaction, thereby obtaining the product. According to the preparation method of the wear-resistant polyurethane elastomer for a polyurethane screen provided by the invention, a certain amount ofepoxide is added during preparation of the polyurethane elastomer, the epoxide can be uniformly dispersed in a soft chain segment of polyurethane and has a certain combination reaction with groups ona polyurethane molecular chain segment, so that the polyurethane molecular soft chain segment is relatively difficult to move, and the elastic deformation of the prepared polyurethane elastomer is enhanced.

Description

technical field [0001] The invention belongs to the technical field of polyurethane screens, in particular to a method for preparing wear-resistant polyurethane elastomers for polyurethane screens. Background technique [0002] Polyurethane elastomer (PUE), as a high-strength, high-elasticity, wear-resistant, aging-resistant engineering material, is widely used in chemical, textile, automotive, medical and other fields. [0003] Polyurethane screen is made of polyurethane elastomer, a new synthetic material between plastic and rubber. It is widely used because of its high precision, high screening efficiency and long service life when used with laminated vibrating screen Coal preparation, mineral processing and other industries. [0004] Existing technology "A production process of polyurethane screen, application number 201510527860.5, the present invention relates to a production process of polyurethane screen, including the following steps: (1), raw material preparation;...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/12C08G18/28C08G18/36C08G18/48C08G18/32
CPCC08G18/12C08G18/2845C08G18/36C08G18/4854C08G18/6674C08G18/6696C08G18/3206
Inventor 赵春升
Owner 界首万昌新材料技术有限公司
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