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Preparation method of polyether polyarethane microporous elastic body

A technology of polyether-based polyurethane and microporous elastomer is applied in the field of preparation of polyurethane elastomer, which can solve the problems such as the decline of mechanical properties of products, and achieve the effects of improved mechanical properties, simple processing technology and environmental friendliness.

Inactive Publication Date: 2003-07-09
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When used to prepare polyurethane, the monoalcohol does not react with isocyanate and acts as a chain terminator, which limits the growth of polymer molecular weight, resulting in a decrease in the mechanical properties of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Catalyst preparation: use diethylene glycol dimethyl ether as an organic ligand to prepare a zinc hexacyanocobaltate / zinc sulfate (DMC) composite catalyst improved with zinc sulfate.

[0027] (1) Solution preparation

[0028] Solution A: Dissolve 15 g of potassium hexacyanocobaltate in 270 ml of deionized water.

[0029] Solution B: Dissolve 45g of zinc chloride in 75ml of deionized water.

[0030] Solution C: a mixture of 180 ml diglyme and 180 ml deionized water.

[0031] (2) After mixing solution A and solution B under high-speed stirring, immediately add solution C to obtain a milky white suspension, continue stirring for 30 minutes, and separate the solid matter by filtration.

[0032] (3) Slurry the solid matter with a mixture solution containing zinc sulfate. Stir for 20min and filter. Slurry composition: 105ml diethylene glycol dimethyl ether + 45ml deionized water + 12g zinc sulfate

[0033] (Potassium zinc hexacyanocobaltate: zinc sulfate = 1:5...

Embodiment 2

[0045] 1, catalyst preparation (with embodiment one)

[0046] 2. Preparation of polyether polyol:

[0047] Polyether polyol A (same as embodiment one)

[0048] Polyether polyol B (same as embodiment one)

[0049] 3. Preparation of semi-prepolymer

[0050] 72 parts of 4,4'-diphenylmethane diisocyanate (MDI), 9 parts of carbodiimide modified MDI, 13 parts of polypropylene oxide diol with a molecular weight of 400, 6 parts of low unsaturation polyether Alcohol A was reacted at 85-90°C for 2.5 hours to obtain a semi-prepolymer. After analysis, the content of terminal isocyanate groups was: NCO%=23.0%.

[0051] 4, the preparation of polyol mixture (with embodiment one)

[0052] 5. Fully mix the isocyanate-terminated semi-prepolymer and polyol mixture for 5 seconds at a temperature of 45° C. to control the isocyanate index to 100, pour, foam, and demould to obtain a test piece. A performance test was carried out one week later, and the results are shown in Table 1.

Embodiment 3

[0054] 1, catalyst preparation (with embodiment one)

[0055] 2. Preparation of polyether polyol:

[0056] Polyether polyol B (same as embodiment one)

[0057] Polyether polyol C: 50g polyoxypropylene glycol (molecular weight is 400) starter and modified double metal cyanide complex catalyst 0.0094g (catalyst in final polyol) are charged in 1 liter of band stirring reactor Content 25ppm). The mixture was stirred and heated to 105° C., and replaced by vacuum bubbling with nitrogen to remove traces of water in the diol starter and oxygen in the reaction vessel. When the reactor is filled with nitrogen to normal pressure, pre-dosing 20g of propylene oxide enters the "induction period" of the catalyst, and the pressure of the reactor is 3.0kg / cm 2 . Then pay attention to observe the pressure of the reactor. Catalyst activation is indicated when there is an accelerated pressure drop in the reactor - the end of the "induction period". The reaction temperature was controlled at...

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Abstract

The preparation method of polyether base polyurethane microporous elastomer is characterized by that it uses water as foaming agent, and utilizes the polyether polyol with low degree of unsaturation which is synthesized by bimetal cyanide catalyst and small molecular substance which partially contains active hydrogen to react with isocyanate firstly to obtain isocyanate end-capped semi-prepolymer, then said semi-prepolymer and polyol mixture component are undergone the processes of fully-mixing, pouring, foaming and demoulding so as to obtain the invented polyurethane microporous elastomer. Said method raises the compatibility of hard section in the soft section of polyol, reduces the epitaxy of hard section phase and improves the microphase separation so as to raise its tensile strength, extensibility, tearing severity and rebound resilience.

Description

Technical field: [0001] The invention belongs to a preparation method of a polyurethane elastomer, in particular to a preparation technology of a polyether-based polyurethane microporous elastomer. Background technique: [0002] Due to its excellent wear resistance, tear resistance, flexibility and low density, the microcellular polyurethane elastomer material is especially prominent in energy absorption, and the absorption rate of impact energy is as high as 75-95%, so it is gradually replacing the traditional Rubber materials are widely used in automotive soft parts and footwear. [0003] Polyurethane microcellular elastomers entered the shoemaking industry in the late 1960s. In the early 1970s, the amount of polyurethane microcellular elastomers used for sole materials in the world was only 7,000 tons. With the rapid development of the polyurethane shoe industry, it has reached 334,000 tons by 2000, with an annual growth rate of 39.2%, while the growth rate of other shoe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48
Inventor 亢茂青王心葵殷宁冯月兰张清运瞿波
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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