A kind of preparation method of one-component high-temperature self-crosslinking waterborne polyurethane

A water-based polyurethane, self-crosslinking technology, applied in coatings and other directions, can solve the problems of unsatisfactory crosslinking effect, poor storage stability of emulsion, short service life of emulsion at high temperature, etc., to achieve excellent water resistance, excellent physical and mechanical properties, long The effect of high temperature service life

Active Publication Date: 2020-05-05
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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  • A kind of preparation method of one-component high-temperature self-crosslinking waterborne polyurethane
  • A kind of preparation method of one-component high-temperature self-crosslinking waterborne polyurethane
  • A kind of preparation method of one-component high-temperature self-crosslinking waterborne polyurethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Synthesis of waterborne polyurethane

[0032] Add 30 parts of Pol-2356 (hydroxyl value 54~56mg KOH / g, produced by Qingdao Yutian Chemical Industry), 1 part of trimethylolpropane (Sweden Pastor Company), and 4 parts of dimethylolpropane into the reactor. (DMPA) Hydrophilic Agent (Sweden Pastor Company), heated to 70℃ with sufficient stirring, added 25 parts of isophorone diisocyanate, heated to 75~85℃, reacted for 3~5 hours, added 8 parts The capping agent hydroxyethyl acrylate is reacted for 2 to 3 hours, then the temperature is lowered to 50°C, 2 parts of the salt forming agent are added, and the salt is formed for 10 minutes, 120 parts of deionized water are added, and the material is discharged after stirring for 60 minutes to obtain the required water Polyurethane.

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

[0034] A. Preparation of pre-emulsion

[0035] Take 100 parts of the synthesized waterborne polyurethane, add 70...

Embodiment 2

[0039] Repeat the steps of Example 1 except that 2-vinyl-2-oxazoline is not added in the copolymerization, and the others are the same as in Example 1.

Embodiment 3

[0041] Repeat the steps of Example 1 except that 2 parts of 2-vinyl-2-oxazoline are added to the copolymerization, and the others are in 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 engineering, 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, is safe and environmentally friendly, does not pollute the environment, and has good physical and mechanical properties, excellent low temperature resistance, weather resistance and other properties. It is widely used in paints, coatings, adhesives, fabric finishing, leather, synthetic leather finishing and inks, etc. field. However, compared with solvent-based polyurethanes, water-based polyurethanes often have the disadvantages of poor water resistance, solvent resistance and mechanical properties due to the introduction of hydrophilic groups, the characteristics of their own structure and the limitations of their water-based curing agents. Since waterborne polyurethane can neither be crosslinked wit...

Claims

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Application Information

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Patent Type & Authority Patents(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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