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Method for preparing corrosion-resisting polyurethane elastomer

A technology of polyurethane elastomer and polyurethane elasticity, which is applied in the field of chemical synthesis, can solve the problems of poor corrosion resistance, less than 60%, and achieve high corrosion resistance

Active Publication Date: 2013-06-26
SHANDONG INOV POLYURETHANE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The corrosion resistance of ordinary polyurethane elastomer products is relatively poor. After soaking in 10% sulfuric acid solution or 10% sodium hydroxide solution for 7 days, the mechanical property retention rate of the product is usually less than 60%.

Method used

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  • Method for preparing corrosion-resisting polyurethane elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Prepolymer component: by weight percentage, polytetrahydrofuran ether polyol (PTMG2000) 72% of molecular weight 2000, 4,4'-diphenylmethane diisocyanate (MDI-100) 21.0% and carbonized diimide modification 7.0% of 4,4'-diphenylmethane diisocyanate (liquefied MDI) was reacted at 80°C for 2 hours, and vacuum (-0.095MPa) was used to remove air bubbles to obtain a prepolymer with an isocyanate content of 6.0%.

[0025] The prepolymer and the chain extender BDO are mixed and reacted at a mass ratio of 100:5.8, the mixing temperature is 85°C, then poured into the mold and vulcanized at 120°C for 60 minutes to release the mold, and finally vulcanized at 110°C for 12 hours. A polyurethane elastomer article with a hardness of Shore A80 was obtained.

Embodiment 2

[0027] Prepolymer component: by weight percentage, molecular weight 1000 polycaprolactone polyol (PCL210) 20.2%, molecular weight 2000 polycaprolactone polyol (PCL220) 43.8%, MDI-100 25.5% and liquefied MDI 10.5%, React at 80° C. for 2 hours, vacuum (-0.095 MPa) to remove air bubbles, and obtain a prepolymer with an isocyanate content of 8.1%.

[0028] The prepolymer and the chain extender HQEE are mixed and reacted at a mass ratio of 100:18, the mixing temperature is 95°C, then poured into the mold and vulcanized at 120°C for 30 minutes to release the mold, and finally vulcanized at 110°C for 12 hours. A polyurethane elastomer article with a hardness of Shore A92 was obtained.

Embodiment 3

[0030] Prepolymer component: by weight percent, polytetrahydrofuran ether polyol (PTMG1000) 38% of molecular weight 1000, polytetrahydrofuran ether polyol (PTMG2000) 18% of molecular weight 2000, MDI-100 28.6% and liquefied MDI 15.4%, in React at 70°C for 3 hours, vacuum (-0.095MPa) to remove air bubbles, and obtain a prepolymer with an isocyanate content of 10.0%.

[0031] The prepolymer and the chain extender BDO are mixed and reacted at a mass ratio of 100:10.2, the mixing temperature is 85°C, then poured into the mold and vulcanized at 100°C for 30 minutes to release the mold, and finally vulcanized at 110°C for 12 hours. A polyurethane elastomer product with a hardness of Shore A98 was obtained.

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Abstract

The invention, belonging to the technical field of chemical synthesis, particularly relates to a method for preparing a corrosion-resisting polyurethane elastomer, characterized by reacting polymer polyol with diisocyanate to synthesize a prepolymer, and then reacting the prepolymer with a chain extender to prepare the corrosion-resisting polyurethane elastomer. According to the invention, by adding a large amount of modified 4,4'-diphenylmethane diisocyanate to carry out product structural adjustment, and the prepared corrosion-resisting polyurethane elastomer product has higher corrosion resistance than common polyurethane elastomer products.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a preparation method of a corrosion-resistant polyurethane elastomer. Background technique [0002] Polyurethane elastomer (PUE) has a unique structure of soft and hard block copolymers, which endows its products with excellent comprehensive mechanical properties: excellent mechanical properties, wear resistance, oil resistance, aging resistance, and a wide range of adjustable hardness . These excellent comprehensive properties are not available in many other commercial rubbers and plastics. However, in some special fields, such as paper-making rubber rollers, corrosion-resistant rubber rollers, high-elastic polyurethane used in large-scale equipment such as steel rolling, lifting, forging, petroleum, etc., due to frequent contact with acid-base media, in addition to requiring PUE to have conventional performance , also need to have high corrosion resista...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/78C08G18/76C08G18/66C08G18/10C08L75/06C08L75/08
Inventor 陈海良陈由亮刘兆阳
Owner SHANDONG INOV POLYURETHANE