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A kind of preparation method of castor oil-based flame-retardant polyurethane elastomer

A polyurethane elastomer, castor oil-based technology, used in the preparation of flame-retardant castor oil-based polyurethane elastomers, the field of castor oil-based flame-retardant polyurethane elastomers

Active Publication Date: 2014-10-29
CHANGZHOU INST OF DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its flammability limits its application to some extent

Method used

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  • A kind of preparation method of castor oil-based flame-retardant polyurethane elastomer
  • A kind of preparation method of castor oil-based flame-retardant polyurethane elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of modified castor oil base. Add 100 parts of castor oil to the reactor, and react with 20 parts of flame retardant DOPO at 100°C for double bond addition reaction. After 4 hours of reaction, modified castor oil is obtained. Modified castor oil, at 100°C, vacuumize to remove water for 2 hours, set aside.

[0029] Process for preparing castor oil based flame retardant polyurethane elastomers. In the modified castor oil prepared above, add R=CNO / OH=2.5 (molar ratio) liquefied diphenylmethane diisocyanate, mix in proportion, in 100 parts of mixtures, add 4 parts of 200 mesh expandable graphite, Stir evenly, then pour into a preheated flat mold coated with a release agent, react at 60°C for 18 hours, pressurize at 10MPa to solidify and release the mold. Vulcanize for 7 days at room temperature to obtain castor oil-based flame-retardant polyurethane elastomer.

Embodiment 2

[0031] Preparation of modified castor oil base. Add 100 parts of castor oil to the reaction kettle, and react with 60 parts of flame retardant DOPO at 140°C for double bond addition reaction. After reacting for 6 hours, modified castor oil is obtained. Modified castor oil, at 140°C, vacuumize to remove water for 3 hours, set aside.

[0032] Process for preparing castor oil based flame retardant polyurethane elastomers. In the modified castor oil prepared above, add R=CNO / OH=3.5 (molar ratio) liquefied diphenylmethane diisocyanate, mix in proportion, in 100 parts of mixtures, add 6 parts of 400 mesh expandable graphite, Stir evenly, then pour it into a preheated flat mold coated with a release agent, react at 80°C for 10 hours, pressurize at 5MPa to solidify and release the mold. Vulcanize for 7 days at room temperature to obtain castor oil-based flame-retardant polyurethane elastomer.

Embodiment 3

[0034] Preparation of modified castor oil base. Add 100 parts of castor oil to the reaction kettle, and undergo double bond addition reaction with 40 parts of flame retardant DOPO at 120°C. After reacting for 8 hours, the modified castor oil is obtained. Modified castor oil, at 120°C, vacuumize to remove water for 4 hours, set aside.

[0035] Process for preparing castor oil based flame retardant polyurethane elastomers. In the modified castor oil prepared above, add R=CNO / OH=3 (molar ratio) toluene diisocyanate, mix in proportion, add 5 parts of 500 mesh expandable graphite to 100 parts of mixture, stir evenly, then Pour into a preheated flat mold coated with a release agent, react at 70°C for 6 hours, press 1MPa to cure and release the mold. Vulcanize for 7 days at room temperature to obtain castor oil-based flame-retardant polyurethane elastomer.

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Abstract

The invention discloses a method for preparing a castor-oil-based flame-retardant polyurethane elastomer and belongs to the technical field of polymers synthetic chemistry. The method comprises the following steps of: by using cheap and renewable castor oil as the raw material, performing double-bond addition reaction on the castor oil and a fire retardant DOPO at a temperature of 80 to 160 DEG C to obtain modified castor oil; and performing reaction on the modified castor oil, which replaces polyether polyol, and diisocyanate, adding a certain quantity of expansible graphite with specification of 200 to 500 meshes to prepare the flame-retardant polyurethane elastomer. The polyurethane elastomer prepared by the method has the characteristics of low cost, excellent flame-retardant effect and the like.

Description

technical field [0001] The invention belongs to the technical field of polymer synthesis chemistry, and relates to a method for preparing a flame-retardant castor oil-based polyurethane elastomer: the method is to modify cheap and renewable castor oil, and then use the modified castor oil as a raw material to combine with Preparation of castor oil-based flame-retardant polyurethane elastomers by reaction of polyisocyanates. Background technique [0002] Due to the increasing shortage of petroleum resources and the continuous strengthening of people's awareness of environmental protection, the production of biomaterials, chemical raw materials and fuels from renewable resources has attracted more and more attention. Hydroxyl-containing vegetable oil or hydroxylated vegetable oil used as polyols to prepare polyurethane fully meets the requirements of environmental protection and has become a new type of polymer material that has emerged in my country in recent years. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/04C08K7/24C08K3/04C08G18/38
Inventor 王标兵李志超
Owner CHANGZHOU INST OF DALIAN UNIV OF TECH