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Preparation method of polyurethane elastomer with adjustable hardness

A polyurethane elastomer and hardness technology, applied in the field of polyurethane application, can solve the problems of inability to achieve high hardness, long demolding time, narrow hardness range, avoid delamination and high temperature decomposition or denaturation, excellent processing performance, widen Effect of hardness range

Inactive Publication Date: 2020-04-10
SHANDONG INOV POLYURETHANE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hardness of the prepared polyurethane elastomer is only Shore A 60-Shore D55, and the hardness range is narrow, and it cannot reach a high hardness above Shore D55, and the demoulding time of the product is longer, the mechanical properties are low, and the product use is limited; on the other hand , the mass content of isocyanate in component B is relatively low, so the viscosity of component B is relatively high. The gap is large, which leads to uneven mixing and imbalance of proportion; in addition, component C in the CN102942674A patent is a glycol with catalyst added, and amine chain extenders are not involved, and organic catalysts are added to component C binary Alcohol, in actual operation, the two are prone to delamination, and there is a huge quality risk

Method used

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  • Preparation method of polyurethane elastomer with adjustable hardness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The preparation method of the polyurethane elastomer with adjustable hardness described in Example 1 includes the following steps:

[0047] (1) A component 331.8kg: PTMG2000 is dehydrated to a moisture content of 0.03% under the conditions of a temperature of 120°C and a vacuum degree of 0.095MPa, and 1.8kg of triethylenediamine catalyst is mixed uniformly to obtain component A;

[0048] (2) 100 kg of component B: 25.0 kg of PTMG2000, 52.5 kg of MDI-100, and 22.5 kg of liquefied MDI are reacted at 75°C to obtain a prepolymer with an isocyanate content of 23.0%;

[0049] (3) 9.3kg of C component: 9.3kg of 1,4-BDO, dehydrate 1,4-BDO to a moisture content of ≤0.03% as component C.

[0050] The method for preparing a polyurethane elastomer with adjustable hardness using the above three-component composition is as follows:

[0051] Mix the A component and C component prepared above, and then mix and stir evenly with the B component. The mixing temperature is 50 ℃, and the preheating t...

Embodiment 2

[0053] The preparation method of the polyurethane elastomer with adjustable hardness described in Example 1 includes the following steps:

[0054] (1) A component 253.3kg: Dehydrate PTMG1000 at a temperature of 110°C and a vacuum degree of 0.095MPa to a moisture content of ≤0.03% and 1.8kg of tetramethylethylenediamine catalyst to obtain component A;

[0055] (2) 100kg of component B: 21.0kg of PTMG2000, 47.4kg of MDI-100, and 31.6kg of liquefied MDI are reacted at 80°C to obtain a prepolymer with an isocyanate content of 23.0%;

[0056] (3) C component 11.3kg: 11.3kg XYlink P250, dehydrate XYlink P250 to a moisture content ≤0.03% as the C component.

[0057] The method for preparing a polyurethane elastomer with adjustable hardness using the above three-component composition is as follows:

[0058] Mix the A component and the C component prepared above, then mix and stir evenly with the B component at a mixing temperature of 50°C, pour into a mold with a preheating temperature of 90°C,...

Embodiment 3

[0060] The preparation method of the polyurethane elastomer with adjustable hardness described in Example 3 includes the following steps:

[0061] (1) A component 100.6kg: Dehydrate 100.0kg of PTMG1000 at a temperature of 100°C and a vacuum of 0.095MPa to a moisture content of ≤0.03% and 0.6kg of bismuth laurate catalyst to obtain component A;

[0062] (2) 100 kg of component B: 25.4 kg of PTMG1000, 59.7 kg of MDI-100, and 14.9 kg of liquefied MDI were reacted at 80°C to obtain a prepolymer with an isocyanate content of 22.0%;

[0063] (3) C component 13.9kg: 13.9kg of 1,4-BDO, dehydrate 1,4-BDO to a moisture content of ≤0.03% as component C.

[0064] The method for preparing a polyurethane elastomer with adjustable hardness using the above three-component composition is as follows:

[0065] Mix the A component and C component prepared above, then mix and stir evenly with the B component at a mixing temperature of 60℃, pour into a mold with a preheating temperature of 110℃, and open the...

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Abstract

The invention belongs to the technical field of polyurethane application, and particularly relates to a preparation method of a polyurethane elastomer with adjustable hardness. The polyurethane elastomer with adjustable hardness is prepared from the following three components: a component A which is formed by mixing polytetrahydrofuran ether polyol with a catalyst; a component B which is a prepolymer obtained by reacting polytetrahydrofuran ether polyol with diisocyanate; and a component C obtained after a chain extender is dehydrated until the moisture content is less than or equal to 0.03%.The component A and the component C are premixed to serve as a curing agent component, then the component B and the curing agent component are mixed and poured into a mold, the mold is opened, and vulcanization is conducted to obtain the polyurethane elastomer. The hardness-adjustable polyurethane elastomer prepared by the method overcomes the defects that the existing polyurethane elastomer is high in viscosity, a catalyst is easy to layer with an alcohol curing agent and the like, has obvious advantages in the aspects of resilience, wear resistance and mechanical properties, and further widens the hardness range of the polyurethane elastomer.

Description

Technical field [0001] The invention belongs to the technical field of polyurethane applications, and specifically relates to a method for preparing a polyurethane elastomer with adjustable hardness. Background technique [0002] Polyurethane elastomer is a polymer material with a wide range of hardness, high elongation, high wear resistance, good mechanical properties, and excellent resilience. However, according to the use requirements and environments of downstream products, it is necessary to frequently switch raw materials when making products with different hardness and mechanical properties, which results in large equipment loss and low production efficiency, which is not suitable for streamlined production. Therefore, a low-viscosity, easy-to-operate technology that only requires simple operation of the pouring equipment and switching the ratio of three raw materials to produce a series of hardness polyurethane elasticity has emerged. [0003] According to research, the po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/32C08G18/10
CPCC08G18/10C08G18/4854C08G18/7671C08G18/6674C08G18/6685
Inventor 房玉俊李涛宿金明党玮婉
Owner SHANDONG INOV POLYURETHANE
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