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Preparation method of water-based aliphatic polyurethane adhesive for electronic process protection

An aliphatic polyurethane and adhesive technology, applied in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of solvent-based coatings such as VOC environmental protection, PVC refractory degradation, etc., to achieve no easy Flammable and explosive, reasonable solid content, environment-friendly effect

Inactive Publication Date: 2017-08-11
新纶新能源材料(常州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the defects in the above-mentioned prior art, the object of the present invention is to provide a water-based aliphatic polyurethane adhesive for electronic process protection, which solves the refractory degradation of PVC and the VOC environmental protection problems of solvent-based coatings.

Method used

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  • Preparation method of water-based aliphatic polyurethane adhesive for electronic process protection
  • Preparation method of water-based aliphatic polyurethane adhesive for electronic process protection
  • Preparation method of water-based aliphatic polyurethane adhesive for electronic process protection

Examples

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Embodiment 1

[0040] Preparation of One-component Waterborne Polyurethane Protective Adhesive

[0041] (1) Preparation of aliphatic water-based polyurethane: put 120g of PTMEG1000 (functionality 2, molecular weight 1000) into a 1L three-necked flask equipped with a reflux condenser, a thermometer socket and a feed port, then place it in an oil bath at 120°C, and pump Vacuum for 1h. Then cool down to 75°C, add 109.5g IPDI, heat up to 90°C, start the reaction, the reaction is as follows figure 1 . Keep the temperature at 89±1°C for two hours, then lower the temperature to 70°C, add 3.3g NPG (neopentyl glycol) and 4.5g TMP (trimethylolpropane). After complete melting, add 0.02g dibutyltin dilaurate, then raise the temperature to 78±1°C for 45 minutes, then add 11.85g DMPA (dimethylol propionic acid), DMPA reacts with IPDI as follows: figure 2 , DMPA reacts with the prepolymer as image 3 , Add 60g ACE (the amount of acetone added and the time of adding depends on the viscosity) to reduce ...

Embodiment 2

[0046] Preparation of Two-component Waterborne Polyurethane Protective Adhesive

[0047] The preparation of aliphatic water-based polyurethane is the same as in Example 1. Accurately weigh 500g of polyurethane dispersion, slowly add 1.5g of aziridine crosslinking agent at a speed of 700rmp, then add 1.5-2.5g of leveling agent, 1.0-3.0 g associative thickener (according to screen printing mesh number and required viscosity), 0.5-1.0g defoamer, appropriate amount of wetting agent. Disperse for 20 minutes, filter and discharge.

[0048] The two-component water-based polyurethane protective adhesive is used for acid-free special occasions, and aziridine can be used to block the carboxyl group and improve the strength, such as for ITO or special inks with conductivity.

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Abstract

The invention provides a preparation method for a water-based aliphatic polyurethane adhesive for electronic process protection. The water-based aliphatic polyurethane adhesive is prepared from, by weight, 13%-17% of polyols, 12%-14% of isophorone diisocyanate, 0.3%-0.6% of neopentyl glycol, 0.4%-0.7% of trimethylolpropane, 1%-2% of hydrophilic chain-extending agent, 5%-10% of acetone, 0.01%-0.02% of catalyst, 1%-2% of triethylamine, 1%-2% of chain-reextending agent, 0.1%-1.5% of leveling agent, 0.1%-0.5% of defoamer, 0.1%-0.5% of wetting agent and 0.5%-1% of thickening agent and also contains 0.1%-1% of outer cross-linking agent. The prepared water-based aliphatic polyurethane adhesive is friendly to the environment, is reasonable in solid content, safe, environmentally friendly, non-inflammable, non-explosive and the like, and in manufacturing process, the solvent can be used as an ammonia ester level solvent for repeated utilization.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and relates to a polyurethane adhesive, in particular to a method for preparing a water-based aliphatic polyurethane adhesive for electronic process protection. Background technique [0002] At present, in the process protection of electronic components, solvent-based peelable coatings or peelable blue glue made of PVC are commonly used as process protection. Generally, it is painted by screen printing or scraping spraying, and then processed after drying. The layer of adhesive film or coating plays the role of solvent resistance, cutting fluid resistance and dirt resistance in the subsequent sections, and is directly torn off after the final workpiece is formed. However, this kind of material also has big problems: ①During the drying process, VOC emission and environmental protection issues; ②The cost of solvent-based protective coating is high, the solid content is low, and the energy consump...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C08G18/12C08G18/66C08G18/48C08G18/32C08G18/08C08G18/34
Inventor 张子健
Owner 新纶新能源材料(常州)有限公司
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