Single-component high-temperature self-crosslinking waterborne polyurethane preparation method

A water-based polyurethane and self-crosslinking technology, which is applied in the coating and other directions, can solve the problems of poor storage stability of the emulsion, unsatisfactory crosslinking effect, short service life of the emulsion at high temperature, etc., and achieve excellent physical and mechanical properties, excellent water resistance, and long life. Effect of High Temperature Service Life

Active Publication Date: 2018-03-30
LUOYANG SHENGJIA CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The crosslinking groups often introduced into the self-crosslinking waterborne polyurethane structure include acetoacetyl compounds, dihydroxypropionamide (DHPA) compounds, etc. Although these crosslinking groups have the characteristics of self-crosslinking at room temperature, they have poor storage stability of emulsions, Disadvantages such as unsatisfactory cross-linking effect and short service life of emulsion at high temperature

Method used

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  • Single-component high-temperature self-crosslinking waterborne polyurethane preparation method
  • Single-component high-temperature self-crosslinking waterborne polyurethane preparation method
  • Single-component high-temperature self-crosslinking waterborne polyurethane preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Synthesis of waterborne polyurethane

[0032]Add 30 parts of Pol-2356 (hydroxyl value 54-56 mg KOH / g, produced by Qingdao Yutian Chemical Industry Co., Ltd.), 1 part of trimethylolpropane (Sweden Pastor Company), and 4 parts of dimethylolpropionic acid in the reaction kettle. (DMPA) hydrophilic agent (Swedish Pastor company), heat up to 70°C under full stirring, add 25 parts of isophorone diisocyanate, heat up to 75-85°C for 3-5 hours, add 8 parts The end-capping agent hydroxyethyl acrylate reacted for 2 to 3 hours, then cooled to 50°C, added 2 parts of salt-forming agent, salted for 10 minutes, added 120 parts of deionized water, stirred for 60 minutes, and discharged to obtain the required water-based Polyurethane.

[0033] (2) Synthesis of oxazoline-polyacrylate / waterborne polyurethane copolymer emulsion

[0034] A. Preparation of pre-emulsion

[0035] Take 100 parts of the synthesized water-based polyurethane, add 70 parts of deionized water, 2 parts of emuls...

Embodiment 2

[0039] Repeat the step method of embodiment 1, just do not add 2-vinyl-2-oxazoline in the copolymerization synthesis, other are all the same as embodiment 1.

Embodiment 3

[0041] Repeat the step method of Example 1, but add 2 parts of 2-vinyl-2-oxazoline in the copolymerization, and the others are all Example 1.

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Abstract

The invention relates to a single-component high-temperature self-crosslinking waterborne polyurethane preparation method. Single-component high-temperature self-crosslinking waterborne polyurethane is prepared by copolymerization of alkenyl end capped waterborne polyurethane, alkenyl oxazoline and acrylate monomer, wherein the use amount of the alkenyl oxazoline is 1 to 40% of the total amount ofresin. A solid content of prepared emulsion polymer is 15 to 60%, a pH value is 6 to 8, and a molecular weight is 10000 to 200000. According to the preparation method disclosed by the invention, oxazoline radicals are introduced into a waterborne polyurethane structure through copolymerization of the polyurethane, the alkenyl oxazoline and the acrylate; no crosslinking agent is utilized; comparedwith normal-temperature self-crosslinking waterborne polyurethane, storage stability of the obtained emulsion polymer is improved, and high-temperature service life of the obtained emulsion polymer is prolonged; after film formation, the obtained emulsion polymer has excellent water resistance, acid and alkali resistance and chemical resistance; meanwhile, the obtained emulsion polymer further has excellent physical and mechanical properties of large hardness, high elasticity, scratch resistance and the like.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a preparation method of single-component high-temperature self-crosslinking waterborne polyurethane. Background technique [0002] Water-based polyurethane uses water as the medium, which is safe, environmentally friendly and does not pollute the environment. At the same time, it has good physical and mechanical properties, excellent low temperature resistance, and weather resistance. It is widely used in paints, coatings, adhesives, fabric finishing, leather, synthetic leather finishing and printing inks, etc. field. However, compared with solvent-based polyurethane, water-based polyurethane often has the disadvantages of poor water resistance, solvent resistance and mechanical properties due to the introduction of hydrophilic groups, the characteristics of its own structure and the limitation of water-based curing agent. Since water-based polyurethane can neither be cross-link...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08F220/14C08F226/06C08F220/18C08G18/67C08G18/66C08G18/42C08G18/34C08G18/32C09D151/08
CPCC08F283/006C08G18/3206C08G18/348C08G18/42C08G18/672C09D151/08C08G18/6692C08F220/1804
Inventor 李延科
Owner LUOYANG SHENGJIA CHEM CO LTD
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