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Preparation method and application of self-emulsifying accelerant for epoxy colored sand

A technology of epoxy colored sand and self-emulsification, which is applied in the direction of adhesive additives, polymer adhesive additives, etc., and can solve the problems of inability to meet the requirements of light-colored products, poor fluidity, and deep color products

Active Publication Date: 2020-05-01
HUNAN KOSEN NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the epoxy colored sand beautifying agents circulating in the market, foreign ones such as Li Duo Ke, Lei Di, Ma Bei, etc., and domestic ones such as Dr. Teng, Zhuo Gao, Lao Gongchang, etc., all use polyamide curing agents. , this kind of curing agent has good compatibility with epoxy, which is beneficial to the wetting and bonding of epoxy on wet surfaces, but its production process requires complicated requirements, waste water is generated during the synthesis process, and dimer acid is used as a raw material. The product The color is dark and cannot meet the requirements of light-colored products
Most of the self-emulsifying curing agents that have appeared so far have long hydrophilic segments in their molecular chains, resulting in poor fluidity

Method used

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  • Preparation method and application of self-emulsifying accelerant for epoxy colored sand
  • Preparation method and application of self-emulsifying accelerant for epoxy colored sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method of self-emulsifying accelerator is as follows:

[0023] Add 0.01mol% of dibutyltin dilaurate to IPDI, heat to 35℃, add polyethylene glycol monomethyl ether dropwise to control the molar ratio of polyethylene glycol monomethyl ether to IPDI to 1:1.2, use two The n-butylamine titration method is used to determine the -NCO content. When the NCO% is basically stable after the reaction, vacuum distillation is performed to remove the excess IPDI to obtain the intermediate product;

[0024] Heat the bisphenol A epoxy to 80°C, add dodecylamine dropwise, control the molar ratio of dodecylamine to bisphenol A epoxy to 1:2.2, after the addition is completed, heat up to 85°C, react for 4 hours, and add the intermediate The product is such that the molar ratio of dodecylamine to intermediate product is 1:1.95. It reacts to NCO%<0.1%, and is prepared from emulsification accelerator.

Embodiment 2

[0026] The molar ratio of dodecylamine to intermediate product is 1:1.5.

[0027] The accelerators of Example 1 and Example 2 were dispersed in deionized water, and the characteristics of the aqueous solution and the dispersion stability after standing for 24 hours were observed. The results are shown in Table 1.

[0028] Table 1

[0029] Test items Example 1 Example 2 Characteristics of aqueous solution Translucent emulsion White emulsion Dispersion stability stable Slight delamination

[0030] It can be seen from the above results that the accelerator of Example 1 has excellent water solubility and emulsification properties, and good dispersion stability. From the comparison between Example 1 and Example 2, it can be seen that increasing the amount of intermediate product, that is, increasing the content of hydrophilic segments in the accelerator, is beneficial to the improvement of self-emulsification performance.

[0031] A waterborne epoxy resin with 100% solid content and ...

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Abstract

The invention discloses a preparation method and application of a self-emulsifying accelerant for epoxy colored sand. The preparation method comprises the following steps: adding a proper amount of dibutyltin dilaurate into isophorone diisocyanate (IPDI), heating the mixture, dropwise adding polyethylene glycol monoether to enable the mole number of the isophorone diisocyanate to be more than thatof the polyethylene glycol monoether, carrying out a reaction until NCO% is basically stable, and carrying out reduced pressure distillation to obtain an intermediate product; then heating bisphenolA epoxy to 75 DEG C or above, dropwise adding alkyl primary amine, wherein the mole number of the alkyl primary amine is not larger than 50% of the mole number of bisphenol A; performing a reaction for a certain time, adding the intermediate product, carrying out a reaction the reaction until the NCO% is smaller than 0.1%, thereby preparing the self-emulsifying accelerant. The method has the advantages of simple process, no wastewater generation, controllable molecular structure and excellent emulsifying property, and is especially suitable for being applied to an epoxy colored sand curing agent system.

Description

Technical field [0001] The invention relates to the technical field of epoxy curing agents, in particular to a preparation method and application of a self-emulsifying accelerator for epoxy colored sand. Background technique [0002] At present, the epoxy colored sand beautifying agent on the market, foreign ones such as Lidoco, Leidi, Horseback, etc., domestic ones such as Dr. Teng, Zhuogao, senior foreman, etc., all use polyamide curing agents This kind of curing agent has good compatibility with epoxy, which is good for the wetting and bonding of epoxy on wet surface. However, its production process is complicated, wastewater is generated during the synthesis process, and dimer acid is used as a raw material. The color is dark and cannot meet the requirements of light-colored products. Most of the self-emulsifying curing agents that have appeared at present have long hydrophilic segments in the molecular chain, and their fluidity is not good. Summary of the invention [0003]...

Claims

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Application Information

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IPC IPC(8): C08G65/333C08G59/68C09J11/08
CPCC08G65/33396C08G59/686C09J11/08
Inventor 欧阳光华钟雪琴郑保昌石亮
Owner HUNAN KOSEN NEW MATERIAL
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