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Diaphragm treatment equipment for removing free monomer of additive compound of polyurethane

A polyurethane adduct and thin film treatment technology, which is applied in the direction of separation methods, evaporation, chemical instruments and methods, etc., can solve the problems of adverse effects of product end uses, difficult recycling of entraining agents, and increased product costs, etc., to achieve a simple and reasonable structure , reduce the residence time, avoid the effect of aging

Active Publication Date: 2008-06-04
GUANGDONG HUARUN PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Chinese patent CN2551311 improves the thin-film evaporation equipment and adopts the circulation method to separate, which can improve the product purity to a certain extent; but it is only suitable for non-heat-sensitive substances. For heat-sensitive substances such as polyisocyanate, long-term cycle heating will cause material aging , the performance decreases, the color deepens
The use of this entrainer will inevitably increase the cost of the product; while the entrainer contains free monomers, there is a problem that the entrainer is difficult to recycle; and more entrainer will remain in the product, because the boiling point of the entrainer is high. Difficulty in volatilization during use will have adverse effects on the end use of the product

Method used

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  • Diaphragm treatment equipment for removing free monomer of additive compound of polyurethane
  • Diaphragm treatment equipment for removing free monomer of additive compound of polyurethane
  • Diaphragm treatment equipment for removing free monomer of additive compound of polyurethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The TDI-TMP adduct containing 20% ​​free TDI (preheated to 100 ° C) is continuously passed through the thin film processing equipment, wherein the separation area of ​​the thin film evaporator is 0.5 square meters, and the stirring spindle is equipped with a movable stirring scraper from top to bottom, Fixed straight stirring scraper and fixed spiral stirring scraper, with two outlets in the lower section and one outlet in the upper section, the linear velocity of the film is 8m / s, the separation temperature is 180°C, the separation vacuum is 230Pa, the processing capacity per hour is 47kg, and the curing agent after separation The indicators are shown in the table below:

[0047] indicators

Embodiment 2

[0049] The TDI-TMP adduct containing 20% ​​free TDI (preheated to 100 ° C) is continuously passed through the thin film processing equipment, wherein the separation area of ​​the thin film evaporator is 2 square meters, and the stirring shaft is from top to bottom with a movable stirring scraper, Straight stirring scraper and spiral stirring scraper, one outlet in the lower section and two outlets in the upper section, the linear velocity of the film is 8.4m / s, the separation temperature is 180°C, the separation vacuum is 238Pa, the processing capacity per hour is 184kg, and the curing agent index after separation See the table below:

[0050] indicators

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Abstract

A film apparatus for separating the free monomers from the addition compound of polyurethane has a film evaporator with feeding inlet, two or more vapor outlets and discharging outlet and a stirring mainshaft with 2-8 columns of fixed straight scrap plates and 2-8 columns of movable spiral scrap plates.

Description

technical field [0001] The invention relates to a film processing device for separating free monomers in polyurethane adducts. Background technique [0002] At present, the development of polyurethane coatings in China is very rapid, and it is the largest variety of existing solvent-based coatings. The paint film of polyurethane coatings has the advantages of high hardness, good toughness, chemical resistance, and fast drying, so it is widely used in automobiles, Construction and electrical appliances, and occupy a dominant position in furniture and home decoration coatings. [0003] Polyurethane adducts are often used as polyisocyanate components of polyurethane coatings. In actual production, diisocyanates are often synthesized by reacting with polyols. In the reaction synthesis, because a small amount of diisocyanate monomers do not participate in the reaction, but remain in the system, during the construction and drying process, these diisocyanate monomers are volatiliz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D1/22C08G18/82
Inventor 刘新泰温晋嵩曾光明李林芳
Owner GUANGDONG HUARUN PAINT CO LTD