Process for continuous purification of polymer polyols

A purification method and polyol technology, which is applied in the continuous purification field of polymer polyols, can solve the problems of high odor, high VOC, and high residual acrylonitrile monomer, so as to improve the stripping effect, avoid fouling, and produce no yellowing change effect

Active Publication Date: 2022-07-01
JIANGSU CHANGHUA POLYURETHANE SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is that in the prior art, there are problems of high residual styrene and acrylonitrile monomers in polymer polyols, high odor and high VOC, and a new method for purifying polymer polyols is provided. The polymer polyol prepared by this purification method has the characteristics of low styrene monomer content and low acrylonitrile content

Method used

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  • Process for continuous purification of polymer polyols
  • Process for continuous purification of polymer polyols

Examples

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Effect test

Embodiment 1

[0023] 1) The polymer polyol (CHP-2045D) I with a styrene content of 1.69% and acrylonitrile content of 1.86% is continuously fed into the first-stage flash tank with a capacity of 20T to control the polymerization. The liquid level of the polymer polyol I in the first-stage flash tank is 35%, and the flow rate of the polymer polyol I is 6t / h, then the residence time of the polymer polyol I in the first-stage flash tank is 1.17h ; The first-stage flash tank is bubbling with nitrogen at the same time, and the nitrogen flow is 150m 3 / h, control the pressure in the kettle to be -0.080Mpa, and the temperature in the tank to be 155°C to continuously obtain material I;

[0024] 2) Continuously feed the material I into the second-stage flash tank, the capacity of the first-level flash tank is 16T, the liquid level of the material I in the second-level flash tank is controlled to be 40%, and the flow rate of the material I is 6t / h, then the residence time of the material I in the s...

Embodiment 2

[0028] 1) The polymer polyol (CHP-H45) I with a styrene content of 1.80% and acrylonitrile content of 1.95% is continuously fed into the first-stage flash tank with a capacity of 20T to control the polymerization. The liquid level of the polymer polyol I in the first-stage flash tank is 50%, and the flow rate of the polymer polyol I is 8t / h, then the residence time of the polymer polyol I in the first-stage flash tank is 1.25h ; The first-stage flash tank is bubbling with nitrogen at the same time, and the nitrogen flow is 200m 3 / h, the pressure in the kettle is controlled to be -0.075Mpa, and the temperature in the tank is 160°C to continuously obtain material I;

[0029] 2) Continuously feed the material I into the second-stage flash tank, the capacity of the first-level flash tank is 16T, control the liquid level of the material I in the second-level flash tank to 50%, and the flow rate of the material I is 6t / h, the residence time of the material I in the second-stage f...

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Abstract

The invention relates to a continuous purification method of a polymer polyol, which mainly solves the problems in the prior art that the styrene monomer and acrylonitrile monomer in the polymer polyol have high residues, the polymer polyol has a strong odor and high VOC. The present invention adopts a new continuous purification method of polymer polyol, comprising: continuously, in mass percentage, the polymer containing 1.50-2.5% of acrylonitrile monomer and 1.85-2.5% of styrene monomer The polyol I passes through the first-level flash tank, the second-level flash tank, the third-level flash tank, the vibrating screen and the stripping tower in sequence, and continuously obtains polymers with styrene content≤5ppm and acrylonitrile content≤2ppm The technical solution of the polyol II solves the problem well and can be used in the industrial application of the polymer polyol.

Description

technical field [0001] The present invention relates to a continuous purification method of polymer polyol. Background technique [0002] The polymer polyol is based on polyether polyol, and is prepared by grafting vinyl monomer onto the basic polyether polyol through free radical in-situ polymerization. Polymer polyols are mainly used in the production of flexible polyurethane foams, which are widely used in life. [0003] In the current process of conventionally preparing polymer polyols, styrene is introduced into vinyl monomers, which increases the bearing capacity of foamed products and improves the appearance of products. However, after the introduction of benzene series, the types and contents of monomers in the products increase, the odor increases. In recent years, with environmental protection factors and the requirements of downstream customers, the demand for polyurethane polyol products with excellent performance has become more and more strict, and polymer po...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C08F6/00C08L51/08
CPCC08F6/001C08L51/08
Inventor张敏浦建荣黄萍赵子龙卢佳徐一东
OwnerJIANGSU CHANGHUA POLYURETHANE SCI & TECH