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A kind of environment-friendly strippable waterborne polyurethane resin and its preparation method and application

A water-based polyurethane, environmentally friendly technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of reduced performance, easy whitening, easy to fall off, etc., to achieve lower equipment requirements, simple synthesis process, and avoid influencing factors Effect

Active Publication Date: 2017-10-10
GUANGZHOU GUANZHI NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Manufacturers will add a layer of protective coating to the surface of glass, ceramics, metal building materials and other materials to prevent them from being scratched during processing, transportation and assembly, which will affect their aesthetics and even reduce their performance
[0003] At present, most of the basic resins used in peelable coatings on the market are still solvent-based, which will cause pollution and damage to the environment and human body during production, construction and use, which is contrary to the development concept of green environmental protection
Although a small number of water-based products are in use, many problems have been exposed: (1) During use, the coating and the substrate cannot always be bonded together and are easy to fall off; (2) The coating is not strong enough and is not easy to The whole piece is peeled off; (3) As an internal emulsifier, the hydrophilic chain extender plays a vital role in the stability of the emulsion, but after the coating film is dried, it is very easy to absorb water, making the coating water resistance poor, water absorption Afterwards, it is easy to whiten, which greatly reduces the protective effect of the coating film on the substrate; (4) The coating has poor acid and alkali resistance and high and low temperature resistance, etc.

Method used

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  • A kind of environment-friendly strippable waterborne polyurethane resin and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1: the preparation of environment-friendly type peelable waterborne polyurethane resin

[0040] Under the protection of dry nitrogen, add 80 grams of polytetrahydrofuran ether glycol and 26.7 grams of isophorone diisocyanate after vacuum dehydration at 120°C for 2 hours into the reactor, and control the temperature at 70-90°C under mechanical stirring. React for 2 hours; add 5.6 grams of diethylene glycol, 3.5 grams of dimethylol propionic acid, and react for 3 hours at 70-85°C; when the temperature drops below 50°C, add 2.45 grams of triethylamine to adjust the pH of the system to a weak Alkaline, continue to stir for 5 minutes; add 0.7 grams of blocked isocyanate latent curing agent (TPA-B80X), continue to stir for 5 minutes; add 200 grams of water, and disperse at high speed (preferably ≥1200 r / min) for 10 minutes; add B 1.5 grams of diamine, continue to disperse at high speed for 30 minutes, and you can get an environmentally friendly peelable water-based...

Embodiment 2

[0041] Embodiment 2: the preparation of environment-friendly type peelable waterborne polyurethane resin

[0042] Under the protection of dry nitrogen, 40 grams of polytetrahydrofuran ether glycol, 40 grams of polypropylene glycol, and 44.4 grams of isophorone diisocyanate after vacuum dehydration at 120 ° C for 2 h were added to the reactor, and the temperature was controlled under mechanical stirring. React at 70-90°C for 2 hours; add 4.0 grams of diethylene glycol, 5.0 grams of dimethylol propionic acid, and react at 70-85°C for 3 hours; when the temperature drops below 50°C, add 2.45 grams of triethylamine , continue to stir for 5 minutes; add 4.5 grams of blocked isocyanate latent curing agent (TPA-B80X), continue to stir for 5 minutes; add 200 grams of water, and disperse at high speed for 10 minutes; add 1.5 grams of ethylenediamine, continue to disperse at high speed for 30 minutes, The environment-friendly peelable water-based polyurethane resin can be obtained.

Embodiment 3

[0043] Embodiment 3: the preparation of environment-friendly type peelable waterborne polyurethane resin

[0044]Under the protection of dry nitrogen, 40 grams of polycaprolactone diol, 40 grams of polybutylene adipate diol, and 34.8 grams of toluene diisocyanate were added to the reactor after vacuum dehydration for 2 h at 120 ° C. Under mechanical stirring, control the temperature at 70-90°C for 2 hours; add 5.6 grams of diethylene glycol, 3.5 grams of dimethylol propionic acid, and react at 70-85°C for 3 hours; when the temperature drops below 50°C, add Measure 2.45 grams of triethylamine, continue to stir for 5 minutes; add 2.8 grams of epoxy siloxane latent curing agent (OS-9012), continue to stir for 5 minutes; add 200 grams of water, and disperse at high speed for 10 minutes; add ethylenediamine 1.5 grams, continue to disperse at high speed for 30 minutes, and you can get an environmentally friendly peelable water-based polyurethane resin.

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PUM

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Abstract

The invention belongs to the technical field of preparation of waterborne polyurethane resin, and discloses an environment-friendly peelable waterborne polyurethane resin and a preparation method and an application thereof. The preparation method includes the following concrete steps of: mixing dehydrated oligomer dihydric alcohol with diisocyanate and heating for reaction; adding micromolecular chain extender and hydrophilic chain extender, and heating for reaction; sequentially adding neutralizer, latent curing agent, water and chain post-extender, mixing to uniformity, and thereby obtaining the environment-friendly peelable waterborne polyurethane resin; the latent curing agent includes at least one of enclosed isocyanates and siloxanes including epoxy groups. The latent curing agent is added into the environment-friendly peelable waterborne polyurethane resin for reacting with hydrophilic groups in the resin system during the film forming process of emulsion to remove the hydrophilic groups, so that the resin is endowed with good water resistance, and the latent curing agent is further cross-linked for solidifying during the film forming process, so that the comprehensive performance of the resin is further improved, the service life of the film is prolonged, and long-term effective protection performance can be provided.

Description

technical field [0001] The invention belongs to the technical field of water-based polyurethane preparation, and in particular relates to an environment-friendly peelable water-based polyurethane resin and a preparation method and application thereof. Background technique [0002] With the continuous improvement of living standards, people's requirements for product appearance, environmental protection and performance are also increasing. Manufacturers will add a layer of protective coating to the surface of glass, ceramics, metal building materials and other materials to prevent them from being scratched during processing, transportation and assembly, which will affect their aesthetics and even reduce their performance. [0003] At present, most of the base resins used in strippable coatings on the market are still solvent-based, which will cause pollution and damage to the environment and human body during production, construction and use, which is contrary to the developm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C09D175/06C09D175/08C09D5/20
CPCC08G18/0823C08G18/12C08G18/4018C08G18/4202C08G18/4238C08G18/4277C08G18/44C08G18/4808C08G18/4854C08G18/6607C08G18/6625C08G18/664C08G18/6659C08G18/6674C08G18/6692C09D5/20C09D175/06C09D175/08C08G18/80C08G18/3228
Inventor 龙志云欧阳娇李俊梅欧阳洁
Owner GUANGZHOU GUANZHI NEW MATERIAL TECH