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A kind of polyurethane and preparation method thereof

A polyurethane and polyester polyol technology, applied in the field of elastomers, can solve the problems of complex post-processing, three wastes, and no industrialization, and achieve the effect of reducing waste and solving white pollution

Active Publication Date: 2022-03-29
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that these reports are all prepared from monomers. Due to the production of a large number of by-products, complex post-processing and a large amount of three wastes are produced, there is no real industrialization

Method used

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  • A kind of polyurethane and preparation method thereof
  • A kind of polyurethane and preparation method thereof
  • A kind of polyurethane and preparation method thereof

Examples

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preparation example Construction

[0041] In the present invention, the preparation method of described PET polyester polyol preferably comprises:

[0042] Carrying out the first reaction of PET, poly(carbonate-ether) glycol, small molecule glycol, catalyst and antioxidant to obtain an intermediate;

[0043] The intermediate and the small molecule dibasic acid are subjected to a second reaction to obtain polyester polyol.

[0044] In the present invention, the type and amount of the PET, poly(carbonate-ether) glycol, small molecule glycol, catalyst, antioxidant and small molecule dibasic acid are consistent with those described in the above-mentioned technical scheme. This will not be repeated here.

[0045]In the present invention, the first reaction is preferably carried out under the protection of nitrogen. In the present invention, the first reaction preferably includes:

[0046] After raising the temperature of PET, poly(carbonate-ether) glycol, small molecule glycol, catalyst and antioxidant to 130-170...

Embodiment 1

[0071] The synthesis of embodiment 1 polyurethane

[0072] Weigh 110g of PET polyester polyol and put it into a reaction kettle, heat to 80°C, depressurize for 3 hours, add 18g of toluene diisocyanate, react for 4 hours to obtain a reaction product;

[0073] Add 0.06g of stannous octoate and 0.68g of IRGANOX1076 to the reactor, and continue to react with the above reaction product for 2 hours to obtain an intermediate product;

[0074] Raise the temperature of the reactor to 140° C., add 4.2 g of 1,3-propanediol, react with the above-mentioned intermediate product for 2 hours, and discharge to obtain polyurethane.

Embodiment 2

[0075] The synthesis of embodiment 2 polyurethane

[0076] Weigh 230g of PET polyester polyol and put it into a reaction kettle, heat to 120°C, depressurize for 1 hour, add 69g of dicyclohexylmethane diisocyanate, and react for 1 hour to obtain a reaction product;

[0077] Add 0.15g of dibutyltin dilaurate and 4.5g of IRGANOX1010 into the reaction kettle, and continue to react with the above reaction product for 1 hour to obtain an intermediate product;

[0078] Raise the temperature of the reactor to 170° C., add 16 g of 1,4-butanediol, react with the above-mentioned intermediate product for 0.5 hour, and discharge to obtain polyurethane.

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Abstract

The invention provides a polyurethane, which is prepared from raw materials including the following materials in parts by weight: 110-230 parts of PET polyester polyol; 18-69 parts of diisocyanate; 0.06-0.15 parts of catalyst; 4.5 copies; chain extender 4.2 to 16 copies. The invention prepares PET polyester polyol by chemical alcoholysis of PET. The polyester polyol prepared by this method not only reduces the waste of petrochemical resources, but also solves the "white pollution" caused by PET, and further reduces the waste of petrochemical resources. Ester polyol is used to prepare polyurethane, so that the tensile strength of the prepared polyurethane exceeds 20MPa, and the elongation at break exceeds 150%. After hydrolysis, the retention rate of tensile strength and elongation at break both exceed 70%, while After hydrolysis of the polyurethane obtained without using PET polyester polyol, the retention rates of tensile strength and elongation at break are both lower than 30%. The invention also provides a preparation method of the polyurethane.

Description

technical field [0001] The invention belongs to the technical field of elastomers, in particular to a polyurethane and a preparation method thereof. Background technique [0002] Polyurethane is a bulk product with an annual output of over 10 million tons in my country. It is widely used in many fields such as adhesives, coatings, elastomers, and foams. Its main raw material, polymer polyol, accounts for 60-80% of the total amount of polyurethane. The annual demand The amount has also reached 6.5-8 million tons. So far, all polymer polyols come from petrochemical resources, and seeking non-petroleum routes to prepare polymer polyols has also received a lot of research. As a kind of thermoplastic polymer material, PET (polyethylene terephthalate) has an annual production capacity of more than 10 million tons in my country. However, due to its strong chemical inertness, PET (polyethylene terephthalate) cannot be biodegraded under natural conditions and will Cause serious "white...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/32C08G63/183C08G63/16C08K5/134
CPCC08G18/664C08G18/4216C08G18/3206C08G63/183C08G63/16C08K5/1345
Inventor 张红明詹磊王献红王佛松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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