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Method for preparing water-based aliphatic polyurethane emulsion type strippable coating

A water-based polyurethane and emulsion-based technology, applied in the field of packaging and decoration, can solve the problems of poor peelability, single protective performance, and low coating film strength

Inactive Publication Date: 2017-06-09
重庆市共赢包装制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing water-based protective coatings still have the disadvantages of low film strength, poor peelability and single protective performance.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0023] The preparation method of aliphatic water-based polyurethane emulsion type peelable coating, 1) Add ammonium persulfate into a flask filled with distilled water at room temperature, stir and mix at a speed of 100~200r / min for 10~20min to obtain an initiator solution, and set aside ; Add isophorone diisocyanate, polypropylene glycol, polyethylene glycol, dibutyltin dilaurate and methyl ethyl ketone in the first reaction kettle at room temperature, then raise the temperature to 58 ~ 80 ℃, make them in the first Mix and react in the reactor until the value of -NCO% in the system does not change, and obtain the primary product, which is set aside;

[0024] 2) Control the temperature at 80°C, add dimethylolpropionic acid to the primary product obtained in step 1) and react for 220~260min, then lower the temperature to 58~63°C, add hydroxyethyl acrylate to the first reaction kettle Ester and react for 100~150min; then lower the temperature to 38~43°C, add triethylamine to obt...

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PUM

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Abstract

The invention discloses a method for preparing a water-based aliphatic polyurethane emulsion type strippable coating. The method comprises the following procedures: (1) adding isophorone diisocyanate and the like into a first reaction kettle at room temperature to obtain a primary product; (2) adding dimethylolpropionic acid and the like into the primary product to prepare acrylate modified aliphatic polyurethane emulsion; (3) adding silica sol and the acrylate modified aliphatic polyurethane emulsion into a third reaction kettle at room temperature to obtain mixed emulsion; (4) adding a proper amount of an acrylate copolymer potassium salt and the like into a fourth reaction kettle in which distilled water is contained to obtain a mixed base solution; (5) adding the mixed emulsion into the mixed base solution to obtain the water-based aliphatic polyurethane emulsion type strippable coating. By the prepared coating, a protected object can be effectively sealed and protected, and can be prevented from being polluted, corroded and damaged. In addition, the coating is also high in water resistance and strippability and stronger in cohesive force and coating film strength.

Description

technical field [0001] The invention relates to the field of packaging and decoration, in particular to a preparation method of an aliphatic water-based polyurethane emulsion type peelable coating. Background technique [0002] In order to prevent the materials or semi-products exposed to the atmosphere from being polluted, corroded and damaged, and prolong their service life, they are usually coated with good protective and peelable coatings on their surfaces for effective and temporary maintenance. Archive protection. In this way, it can not only isolate the invasion of air, salt spray, and microorganisms from the outside to achieve anti-corrosion effect; but also achieve the effect of cleaning and decontamination by adsorbing pollutants. Compared with solvent-based protective coatings, water-based protective coatings are safer and more environmentally friendly, so they are widely used in the field of product packaging and decoration. However, the existing water-based p...

Claims

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Application Information

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IPC IPC(8): C09D151/08C09D5/20C09D7/12C08F283/00C08G18/75C08G18/67C08G18/48C08G18/24C08G18/18
CPCC09D151/08C08F283/008C08G18/12C08G18/1808C08G18/244C08G18/4808C08G18/672C08G18/755C08K2201/011C08L2205/02C08L2205/025C08L2205/035C09D5/20C09D7/61C09D7/63C09D7/65
Inventor 谭春芳
Owner 重庆市共赢包装制品有限公司
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