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Preparation method of polyurethane elastomer containing two kinds of special micropores

A polyurethane elastomer and microporous technology, which is applied in the field of preparation of polyurethane elastomers, can solve problems such as expensive raw materials, and achieve the effects of reducing production costs and broadening application fields.

Pending Publication Date: 2012-08-08
付玉东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the raw material is expensive, so it has been used as a high-end product in special fields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The polycarbonate with a molecular weight of 2000 and 1,5-naphthalene diisocyanate are reacted in a kettle, and the temperature is controlled at 125-145°C. The prepolymer with a -NCO content of 6.5% is obtained by the reaction; the chain extender component is a molten polyester Mainly, fully mix the catalyst, blowing agent, surfactant, thermal foaming microspheres, etc. with the polyester, in which the auxiliary component accounts for 21% of the total chain extender component; using high-temperature casting foaming machine, According to the ratio of prepolymer-NCO mole number and chain extender active hydrogen mole number of 1:1, the reactant material is injected into the mold at 75-90℃, and after molding, it is cured and demolded twice to prepare a mixture containing two A special microporous polyurethane elastomer. The resulting product has a smooth and flat appearance, a full mold cavity (small molding shrinkage), an apparent density of 400kg / m3, a tensile strength of...

Embodiment 2

[0015] Polycaprolactone with a molecular weight of 2000 and 1,5-naphthalene diisocyanate are reacted in a kettle, and the temperature is controlled at 125-145°C. The resulting prepolymer with a -NCO content of 4.6%; the chain extender component is molten polyester Mainly, fully mix catalysts, blowing agents, surfactants, thermal foaming microspheres, etc. with polyester, in which auxiliary components account for 21% of the total chain extender components; adopt high-temperature casting foaming The machine is fully mixed according to the ratio of the moles of prepolymer-NCO and the moles of active hydrogen of the chain agent of 1:1, and the reactant is injected into the mold at 75-90°C. After molding, it is cured and demolded for the second time. Two special microporous polyurethane elastomers. The resulting product has a smooth and flat appearance, a full mold cavity (small molding shrinkage), a surface density of 320kg / m3, a tensile strength of 4.0Mpa, and a hardness of Shore ...

Embodiment 3

[0017] Polyethylene glycol-adipate with a molecular weight of 2000 and 1,5-naphthalene diisocyanate are reacted in a kettle, the temperature is controlled at 125-145℃, and the prepolymer with a content of -NCO of 6.2% obtained by the reaction; chain extender group The main component is molten polyester, and the catalyst, blowing agent, surfactant, thermal foaming microspheres, etc. are fully mixed with the polyester, and the auxiliary component accounts for 21% of the total chain extender component; The high-temperature casting foaming machine mixes the prepolymer-NCO mole number and the chain extender active hydrogen mole number of 1:1, and injects the reactant into a mold at 75-90°C. After molding, it is cured, demolded, A polyurethane elastomer with two special micropores is prepared.

[0018] The resulting product has a smooth and flat appearance, full mold cavity (small molding shrinkage), surface density of 350kg / m3, tensile strength of 4.2Mpa and hardness of Sauer A65.

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Abstract

The invention discloses a preparation method of a polyurethane elastomer containing two kinds of special micropores and aims to solve the problem that a polyurethane elastomer containing one kind of special miropores in the prior art requires high production cost and can be only applied in limited special fields. The preparation method is characterized by the following steps of: mixing a performed polymer component and a chain extender component in proportion, injecting the reaction feed liquid into a die with the die temperature of 75-90 DEG C, molding, followed by secondary slaking, and demoulding to prepare the polyurethane elastomer containing two kinds of special micropores. The product prepared by the method has all performance of the polyurethane elastomer containing one kind of special micropores, and is more excellent than the polyurethane elastomer containing one kind of special micropores due to excellent heat conductivity and low price. The product is mainly used to prepare filled-type high-speed solid tires, high-speed railway sleepers and the like.

Description

Technical field [0001] The invention relates to a preparation method of a polyurethane elastomer containing two kinds of special micropores, in particular to a reduction in the production cost of the product and broadening the application field. Background technique [0002] Due to the excellent static and dynamic mechanical properties of polyurethane elastomers containing a special kind of micropores, industrial applications are very extensive. However, the raw materials are expensive, so they have been used as high-end products in special fields. The pursuit of low cost and high quality is the bottleneck encountered in the development of polyurethane elastomers containing a special kind of micropores. New technological breakthroughs are urgently needed. The polyurethane elastomer containing two kinds of special micropores has all the properties of the polyurethane elastomer containing one kind of special micropores, which greatly reduces the production cost of the product, mak...

Claims

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Application Information

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IPC IPC(8): C08G18/10C08J9/14C08J9/08C08G101/00
Inventor 付玉东
Owner 付玉东
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