Polyurethane reaction ball and preparing method thereof

A technology of polyurethane and reaction, which is applied in the field of polyurethane microporous elastomer hexagonal reaction ball and its preparation, can solve the problems of decreased elasticity, ozone resistance, poor aging resistance, and inability to use, and achieves improved rebound performance and good response ability Effect

Active Publication Date: 2012-08-01
WANHUA CHEM BEIJING +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, rubber products have the following problems: the products have poor ozone resistance and aging resistance. During the processing, storage and transportation of rubber containing unsaturated double bonds, due to the combined effects of heat, light, oxygen and other external factors, physical or chemical damage occurs inside the material. Chemical change that reduce

Method used

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  • Polyurethane reaction ball and preparing method thereof
  • Polyurethane reaction ball and preparing method thereof
  • Polyurethane reaction ball and preparing method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0059] Preparation of Isocynate1: Add 450g of diphenylmethane diisocyanate (Yantai Wanhua, MDI-100) into a three-necked flask equipped with a stirrer, thermometer, and nitrogen tube, heat to 60-70°C, and then add the calculated Polyol 9142.5 g, Polyol 11142.5g, Polyol 1315g. After reacting at 80°C for 2 hours, lower the temperature to below 40°C and then add 250g of polymethylene polyphenyl polyisocyanate (Yantai Wanhua, PM-200), and control the NCO mass fraction of Isocynate1 at 21.6-22.6%;

[0060] Preparation of Isocynate2: Add 400g of diphenylmethane diisocyanate (Yantai Wanhua, MDI-100) into a three-neck flask equipped with a stirrer, thermometer, and nitrogen tube, heat to 60-70°C, and then add 10300g of calculated Polyol , Polyol 1280g, Polyol 1420g. After reacting at 80°C for 2 hours, lower the temperature to below 40°C and then add 200g of polymethylene polyphenyl isocyanate (Yantai Wanhua, PM-200), and control the NCO mass fraction of Isocynate2 at 17.8-18.8%;

[0...

Embodiment 1

[0064] The preparation of embodiment 1 polyurethane reaction ball

[0065]

[0066] At room temperature, put the above-mentioned component A raw materials into the reaction kettle in turn, and use a high-speed shear mixer to stir for 5 minutes at a stirring speed of 1500 rpm, and the output is System1. +Put System1 and Isocynate1 into their respective storage tanks, mix and stir System1 at 25°C and Isocynate1 at 25°C, stir for 8 seconds, pour into a mold at 35°C, open the mold in 7 minutes, leave it at room temperature for 30 hours, and test the mechanical properties . The polyurethane reaction ball prepared according to the method of embodiment 1, density 520kg / m 3 , hardness ShoreA 44, free fall rebound 84%.

Embodiment 2

[0067] The preparation of embodiment 2 polyurethane reaction balls

[0068]

[0069]

[0070]At room temperature, put the above-mentioned component A raw materials into the reaction kettle in turn, and use a high-speed shear mixer to stir for 5 minutes at a stirring speed of 1500 rpm, and the output is System2. Put System2 and Isocynate2 into their respective storage tanks, mix and stir System1 at 24°C and Isocynate1 at 26°C, stir for 7 seconds, pour into a mold at 35°C, open the mold in 7 minutes, and test the mechanical properties after standing at room temperature for 30 hours. The polyurethane reaction ball prepared according to the method of embodiment 2, density 450kg / m 3 , hardness ShoreA 38, free fall rebound 83%.

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Abstract

The invention discloses a polyurethane reaction ball which is a microcellular polyurethane elastomer prepared through raw materials including polymer component A and prepolymer component B. The invention further discloses a method for preparing the reaction ball, which includes: mixing and stirring polyether polyols, foaming agents, chain extenders, color paste and catalysts to obtain the polymer component A; and evenly mixing and stirring the polymer component A and the prepolymer component B according to a certain proportion at temperature of 5-32 DEG C, and pouring the mixture into a reaction ball mold for aging to obtain the polyurethane reaction ball. The foam density of the reaction ball is 100-600kg/m<3>, hardness of the reaction ball is Shore A40+/-10, free-falling resilience can reach 80-90%, and property requirements of high-level reaction balls are met. In addition, the polyurethane reaction ball and the preparing method thereof have good technology processing characteristics, spalling during contraction and mold opening is avoided, and product defective percentage is reduced.

Description

technical field [0001] The invention relates to a reaction ball and a preparation method thereof, in particular to a polyurethane microporous elastomer hexagonal reaction ball and a preparation method thereof. Background technique [0002] The hexagonal ball is also called the reaction ball. It is made of solid rubber. When thrown on the ground, it will rebound in an irregular direction. The rebound performance of the free landing determines the speed of the rebound. The better the rebound performance of the free landing, the faster the rebound speed. Therefore, the free fall rebound is used as a key indicator to evaluate the quality of the reaction ball. Internationally, the reaction ball is an essential product for practicing reaction speed, and is suitable for athletes such as tennis, badminton, and table tennis. [0003] The traditional hexagonal reaction ball is made of rubber, which has excellent low-temperature compliance and high elasticity, and the non-directional ...

Claims

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Application Information

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IPC IPC(8): C08L75/08C08G18/78C08G18/76C08G18/66C08G18/48C08J9/08C08G101/00
Inventor 刘新建张谦和王金赵怡喻建明丁建生
Owner WANHUA CHEM BEIJING
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