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Polyester cross-linking agent and preparation method thereof

A technology of crosslinking agent and polyether type, applied in the field of polyether type crosslinking agent and its preparation, can solve the problems of high toxicity and irritation, short pot life, difficult to dissolve, etc., achieve low toxicity and irritation, foaming Good effect, high molecular weight effect

Inactive Publication Date: 2015-03-25
ZIBO DEXIN LIANBANG CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used cross-linking agents generally have the following disadvantages: relatively high toxicity and irritation, short pot life, or difficult to dissolve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A kind of preparation method of polyether type cross-linking agent, adopts the raw material preparation of following parts by weight: 40 parts of ethylenediamine, 25 parts of sorbitol; 20 parts of sucrose; 1 part of potassium hydroxide (KOH adopts solid feed), ring 421 parts of oxypropane. The preparation method is to feed sucrose and sorbitol at room temperature, replace with nitrogen, pump ethylenediamine into the kettle, gradually raise the temperature to 130-180°C to melt the sorbitol, and gradually continue to feed PO. During the polymerization process, the temperature 90-130°C, because the heat released during the reaction is relatively large, pay attention to the circulation of water to cool down, the pressure is less than 0.3mpa, and the aging is 3-4h. After the monomer is removed, the polyether can be obtained, and the product can be obtained after post-treatment.

[0017] The prepared polyether type crosslinking agent has a hydroxyl value of 460 mgKOH / g, a fun...

Embodiment 2

[0019] A preparation method of a polyether type crosslinking agent is prepared by using the following raw materials in parts by weight: 50 parts of ethylenediamine, 10 parts of sucrose, 10 parts of pentaerythritol, 0.95 parts of KOH, and 400 parts of PO.

[0020] The preparation method is as follows: put sucrose and pentaerythritol at a temperature lower than 60°C, and after nitrogen replacement, pump ethylenediamine into the kettle, raise the temperature to 120-180°C to melt the sucrose, and gradually continue to feed PO. During the polymerization process, the temperature is 105- 130°C, the heat released during the reaction is relatively large, and attention should be paid to circulating water to cool down. Pressure <0.3mpa, aging for 3-4h, after monomer removal, the group polyether can be obtained, and the product can be obtained after post-processing.

[0021] The prepared polyether crosslinking agent has a hydroxyl value of 472 mgKOH / g, a functionality of 4.2, a molecular ...

Embodiment 3

[0023] A preparation method of a polyether type crosslinking agent is prepared by using the following raw materials in parts by weight: 50 parts of sorbitol, 30 parts of sucrose, 30 parts of pentaerythritol, 0.86 parts of KOH, and 360 parts of PO.

[0024] The preparation method is as follows: inputting sorbitol, sucrose and pentaerythritol at a temperature lower than 30 degrees centigrade, replacing with nitrogen, raising the temperature to 120-180 degrees centigrade until the sorbitol and sucrose melt, and dehydrating for 2 hours. Gradually continue to feed PO, and the temperature during the polymerization is 90-130°C. Pressure <0.3mpa. After aging for 5-6 hours, the group polyether can be obtained after removing the monomer, and the product can be obtained after post-processing.

[0025] The prepared polyether type crosslinking agent has a hydroxyl value of 482 mgKOH / g, a functionality of 5.5, a molecular weight of 640, and an acid value of <0.05 mgKOH / g.

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Abstract

The invention discloses a polyester cross-linking agent and a preparation method thereof, and particularly relates to a high-molecular compound obtained through reaction of forming ether bond in a high-molecular main chain, so as to solve the problems that the existing cross-linking agent is large in toxicity and irritation and short in service life. The preparation method of the polyester cross-linking agent comprises the following steps: polymerizing the following active ingredients in parts by weight: 10-40 parts of a starting agent, 0.2-1 part of an alkaline catalyst and 80-260 parts of oxyalkylene substances (namely epoxypropane). The cross-linking agent is high in molecular weight, high in functionality degree and more stable in structure, and therefore, the foaming effect is good, and the service life can be prolonged; the prepared cross-linking agent is high in molecular weight, and the dissolubility with compounds with the high molecular weight is better as the cross-linking agent; and the cross-linking agent is small in the toxicity and irritation of active ingredients, and is safer and more environmental friendly.

Description

technical field [0001] The present invention relates to a polyether used as a cross-linking agent, in particular to a polymer compound obtained by forming an ether bond in the main chain of the polymer. Background technique [0002] Crosslinking agent is also called curing agent, hardener, curing agent, it can transform linear or slightly branched macromolecules into a three-dimensional network structure, thereby improving strength, heat resistance, abrasion resistance, and solvent resistance It can be used for the foaming of rigid foam polyether. Some cross-linking agents currently on the market include aliphatic amine cross-linking agents such as xylylenediamine, ethylenediamine, and triethylenetetramine, and acid anhydride cross-linking agents such as maleic anhydride. Commonly used crosslinking agents generally have the following disadvantages: relatively high toxicity and irritation, short pot life, or difficult to dissolve. Therefore, under the premise of ensuring th...

Claims

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Application Information

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IPC IPC(8): C08G65/28
Inventor 荆晓东李英豪董伟
Owner ZIBO DEXIN LIANBANG CHEM IND
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