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Method for preparing polyester polyol with polyethylene terephthalate waste material

A technology of polyethylene terephthalate and polyester polyol, which is applied in the field of polyester polyol, can solve problems such as easy crystallization, increase production cost, affect hydrolysis resistance stability and catalyst activity, and achieve environmental pollution small effect

Inactive Publication Date: 2008-09-24
鹏欣环球资源股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1148058A discloses a method for producing polyols by alcoholysis of polyester waste. This method has simple equipment and is easy to operate, but its disadvantage is that the obtained polyol products need to be modified by phthalic anhydride, adipic acid, ricinoleic anhydride, etc. , the acid value needs to be controlled during the reaction process, and the final product has a high acid value, and the product has the disadvantages of easy crystallization, high viscosity and low functionality. When using it to prepare polyurethane insulation foam, it will affect the hydrolysis resistance stability and catalyst activity. And it will increase the production cost, which limits its application to a certain extent
The polyol is prepared by reacting polyethylene terephthalate, natural vegetable oil and phthalic anhydride dissolved in small molecule alcohols, but the polyol hydroxyl value prepared by this method is low (less than 250mgKOH / g), and the hydrocarbon And fluorocarbon blowing agent can be dissolved in it, due to the low hydroxyl value also limits the application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Feed 384g of PET waste, 230g of diethylene glycol, and 2g of tetrabutyl titanate. Under nitrogen protection, raise the temperature at 180°C and stir for 5 hours. Add 100g of epoxy biodiesel and react at 200°C for 4 hours. Turn off the nitrogen, vacuumize, keep the vacuum at -0.07MPa, control the temperature at 210°C, heat and stir for 2 hours, and cool to obtain the product. The product has a hydroxyl value of 308mgKOH / g, a viscosity (25°C) of 2500cps, and an acid value of <0.2mgKOH / g.

Embodiment 2

[0023] Feed 384g of PET waste, 130g of diethylene glycol, 74.5g of triethanolamine, and 2g of antimony trioxide. Under nitrogen protection, raise the temperature at 220°C and stir for 4 hours, add 110g of epoxy biodiesel and 100g of diethylene glycol, and react at 200°C for 8 Hour. Turn off the nitrogen, vacuumize, keep the vacuum at -0.07MPa, control the temperature at 210°C, keep stirring for 4 hours, and cool to obtain the product. The product has a hydroxyl value of 450mgKOH / g, a viscosity (25°C) of 3500cps, and an acid value of <0.2mgKOH / g.

Embodiment 3

[0025] Feed 384g of PET waste, 160g of diethylene glycol, 67g of trimethylolpropane, and 3g of tetrabutyl titanate. Under the protection of nitrogen, heat up to 200°C and stir for 6 hours. Add 180g of epoxy biodiesel and 140g of diethylene glycol, 200 °C for 4 hours. Turn off the nitrogen, vacuumize, keep the vacuum at -0.07MPa, control the temperature at 220°C, keep stirring for 5 hours, and cool to obtain the product. The product has a hydroxyl value of 400mgKOH / g, a viscosity (25°C) of 3000cps, and an acid value of <0.2mgKOH / g.

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PUM

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Abstract

The invention relates to the filed of polyester polyol, in particular to a preparation method of the polyester polyol with industrial or domestic waste. In the method of the invention, the PET-based waste and alcohol and / or amine have alcoholysis reaction in a catalyst; and then the product of alcoholysis reaction reacts with epoxy vegetable oil; finally the polyester polyol is obtained. The preparation method of the invention has the advantages of easily obtained raw materials and low production cost, and the hydroxyl value of the polyester polyol prepared with the method is 270 to 700 mgKOH / g.

Description

technical field [0001] The invention relates to the field of polyester polyols, in particular to a method for preparing polyester polyols from industrial or domestic waste. Background technique [0002] Polyester polyols have been widely used to prepare polyurethane rigid foam sheets and adhesives. The earliest polyester polyols were made from petroleum raw materials. Due to the non-renewability of petroleum resources, people began to use other means to produce polyurethane. of polyols. US6107433 and CN1583828A disclose the method of preparing polyols by means of epoxidation, transesterification, etc., using oils such as vegetable oils as raw materials. The disadvantages are that the price of raw materials is high, the reaction is not easy to control, and the post-processing of products is troublesome. In the previous research, the applicant used vegetable oil to directly transesterify alcohol or amine to prepare polyols. The preparation method is simple, but since vegetabl...

Claims

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Application Information

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IPC IPC(8): C08J11/24C08G18/42C08G63/46
CPCY02W30/62
Inventor 黄山吴明致刘亚利张旭琴黎文海
Owner 鹏欣环球资源股份有限公司