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Method for producing polyol by using polyurethane waste

A polyurethane waste, polyester polyol technology, applied in recycling technology, alcoholysis preparation, plastic recycling and other directions, can solve problems such as reducing production efficiency

Active Publication Date: 2011-05-18
ZHEJIANG HUAFON NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this instruction fails to solve the problem of product quality stability, and at the same time, in order to effectively alcoholyze polyurethane waste, the residence time of alcoholysis agent and polyurethane waste in the extruder must reach a certain value, but prolonging the residence time will reduce production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Control polyurethane waste particle, molecular weight be that the polyester polyol alcoholysis agent of 200 to 2000, the speed that antioxidant adds in the twin-screw extruder, make the polyurethane waste particle of 8kg, the molecular weight of 2kg be the polyester polyol of 200 to 2000 The anti-oxidant of alcoholysis agent, 0.5kg is added in the twin-screw extruder at a uniform speed, and the feeding is completed at the same time. The average residence time of polyurethane shoe sole waste particles, polyester polyol alcoholysis agent with a molecular weight of 200 to 2000, and antioxidant in the twin-screw extruder is 5 minutes. Polyurethane sole waste particles, polyester polyol alcoholysis agent with a molecular weight of 200 to 2000, and antioxidant are pre-mixed by a twin-screw extruder and then discharged into a reaction kettle. 6kg of small molecule polyol alcoholysis agent with a molecular weight less than 200 was added to the reaction kettle in advance. Polyu...

Embodiment 2

[0012] Control polyurethane waste granule, molecular weight be that the polyester polyol alcoholysis agent of 200 to 2000, antioxidant add the speed in twin-screw extruder, make the polyurethane waste granule of 2kg, the molecular weight of 8kg be the polyester polyol of 200 to 2000 The anti-oxidant of alcoholysis agent, 0.5kg is added in the twin-screw extruder at a uniform speed, and the feeding is completed at the same time. The average residence time of polyurethane shoe sole waste particles, polyester polyol alcoholysis agent with a molecular weight of 200 to 2000, and antioxidant in the twin-screw extruder is 2 minutes. Polyurethane sole waste particles, polyester polyol alcoholysis agent with a molecular weight of 200 to 2000, and antioxidant are pre-mixed by a twin-screw extruder and then discharged into a reaction kettle. 2.6kg of small molecule polyol alcoholysis agent with a molecular weight less than 200 was added to the reaction kettle in advance. Polyurethane wa...

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PUM

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Abstract

The invention relates to a method for producing polyol by using polyurethane waste. In the scheme adopted by the invention, the method for producing the polyol is characterized by sequentially comprising the following steps of: 1. fully mixing polyurethane waste grains, a polyester polyol alcoholysis agent with molecular weight of 200-2000, and an antioxidant, and then injecting into a reaction kettle; 2. injecting a micro-molecular polyol alcoholysis agent with molecular weight of less than 200 into the reaction kettle, controlling the temperature of the reaction kettle to be between 180 DEGC and 240 DEG C, performing alcoholysis reaction for 30-120 min under the protection of nitrogen; and 3. removing micro-molecular alcohol with molecular weight of less than 200 in vacuum, and reducing temperature and discharging when a hydroxyl value and an acid value reach set values. By adopting the scheme, the invention overcomes the defects of the prior art and provides a preparation method, which is favorable for effectively utilizing resources, reducing or eliminating the source of environment pollution caused by human, and obtaining polyol products with stable quantity.

Description

technical field [0001] The invention relates to a method for producing polyol by using polyurethane waste, in particular to a method for producing polyol by alcoholysis of polyurethane waste. Background technique [0002] Polyurethane (PU) materials are widely used in automobiles, construction, home appliances, textiles, shoe materials, leather and other fields because of their high elasticity, high wear resistance, good low temperature resistance and solvent resistance, and a wide range of performance adjustments. The polyurethane industry is developing rapidly, with a wide variety of products and an increasing output. At the same time, it also produces a large amount of waste, which includes scraps in production and various polyurethane products that are aged and scrapped. Polyurethane waste not only seriously pollutes the environment, but also is a great waste of resources. The recycling of these wastes has become an urgent problem to be solved. [0003] The recycling me...

Claims

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Application Information

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IPC IPC(8): C08J11/26C08J11/24C08J11/28C07C29/128
CPCY02W30/62
Inventor 杜春毅温文宪郝智平刘旭赵叶宝陈一帆
Owner ZHEJIANG HUAFON NEW MATERIALS CO LTD
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