Process for preparing composite modified water polyurethane emulsion

A water-based polyurethane and composite modification technology, which is applied in the field of preparation of composite modified water-based polyurethane emulsion, can solve the problems of insufficient adhesion of substrates, affecting popularization and application, incompatibility between softness and hardness and application performance requirements, etc. To achieve the effect of water resistance improvement

Inactive Publication Date: 2004-12-15
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, although domestic and foreign water-based polyurethanes have made great progress in scientific research, development, and application, water-based polyurethanes still have weak water resistance, insufficient adhesion to substrates, softness, hardness and application performance requirements. Disadvantages such as incompatibility and insufficient gloss and brightness have greatly affected its popularization and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Synthesis method:

[0032] 100g of diisocyanate (HDI) and 165g of polyoxypropylene diol (N 210 , Mw=1000±10) was added to the reaction tank with nitrogen gas, 2.5g of γ-aminopropyltriisooxysilane (KH-550) was added to the above reaction tank, and finally 25g of dimethylolpropane Acid (DMPA) was added to the reaction tank. After stirring the reaction at 70° C. for 5 h, 300 g of prepolymer were obtained.

[0033] 5g of triethylamine was dissolved in 168g of deionized water at 5°C. Add 100 g of the above-mentioned prepolymer to the triethylamine solution under stirring, and emulsify for 25 minutes with a high-speed shear emulsifier.

[0034] Take this polyurethane emulsion 100g, add 2g of K 2 SiO 3 , reacted at 10°C for 4 hours to obtain an emulsion with a solid content of 36.7%, and the emulsion was formed into a film. The dry film was a high-gloss transparent film with a tensile strength of 19.3Mpa, an elongation at break of 485%, and a water absorption of 12.6%.

Embodiment 2

[0036] Synthesis method:

[0037] Mix 100g diisocyanate (TDI) with 250g polyoxypropylene diol (N 220 , Mw=2000±100) was added to the reaction tank with nitrogen gas, 18g aminoethylaminopropyl polydimethylsiloxane was added to the above reaction tank, and finally 5g of dimethylolpropionic acid ( DMPA) was added to the reaction tank. After stirring the reaction at 90° C. for 4.5 h, 373 g of prepolymer were obtained.

[0038] 2g of triethylamine was dissolved in 200g of deionized water at 2°C. Add 100 g of the above-mentioned prepolymer to the triethylamine solution under stirring, and emulsify for 25 minutes with a high-speed shear emulsifier.

[0039] Take this polyurethane emulsion 100g, add 0.8g K 2 SiO 3 , and reacted at 20°C for 3 hours to obtain a polyurethane emulsion with a solid content of 22.2%. The emulsion was formed into a film, and the dry film was a high-gloss transparent film with a tensile strength of 17.3Mpa, elongation at break of 460%, and water absorpti...

Embodiment 3

[0041] Synthesis method:

[0042] 100g of diisocyanate (MDI) and 300g of polyoxypropylene triol (N 330 , Mw=3000±100) was added to the reaction tank with nitrogen gas, 6.5gr-aminopropyltriisooxysilane (KH-550) was added to the above reaction tank, and finally 20g of dimethylolpropionic acid (DMPA) was added to the above reaction tank. The reaction was stirred at 100° C. for 3.0 h to obtain 426.5 g of prepolymer.

[0043] 4 g of triethylamine was dissolved in 162 g of deionized water at 10°C. Add 100 g of the above-mentioned prepolymer to the triethylamine solution under stirring, and emulsify for 25 minutes with a high-speed shear emulsifier.

[0044] Get this polyurethane emulsion 100g, add the colloidal aqueous solution (K 2 O content 7.0~9.0wt%, SiO 2 Content 19~29wt%), stirred and reacted at 18°C ​​for 4h to obtain a polyurethane emulsion with a solid content of 45.6%. After film formation, the dry film was a high-gloss transparent film with a tensile strength of 19.3...

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Abstract

During the preparation of organic and inorganic silicon compound modified water-thinned polyurethane emulsion, organic silicon compound is introduced into polyurethane in the high molecular synthesis or water emulsifying chain expansion, and inorganic silicon compound in certain amount is added into the emulsion for further chain expansion and crosslinking. The method of the present invention is convenient in operation, and the prepared water-thinned polyurethane emulsion can form film with high water resistance, high brightness, proper hardness and other advantages. Compared with un-modified water-thinned polyurethane paint, the present invention has obviously raised technological performance and may be used for wood ware, etc.

Description

field of invention [0001] The invention relates to a preparation method of composite modified water-based polyurethane emulsion of organic and inorganic silicon compounds. Background of the invention [0002] Polyurethane coatings have excellent properties such as wear resistance, oil resistance, chemical corrosion resistance, radiation resistance, good adhesion with other materials, high elasticity and strong vibration absorption ability, but their water resistance and gloss are difficult to meet the requirements of practical applications. Silicone has the advantages of good thermal stability (large Si-O bond energy), oxidation resistance, weather resistance, good low temperature performance, relatively large compressibility, low surface energy, and high dielectric strength. But it also has disadvantages, such as poor mechanical properties, adhesion, wear resistance, and solvent resistance. The introduction of silicone into polyurethane is a promising high-performance poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08G18/72C08K3/34C08K5/54C08L75/08
Inventor 刘伟区侯孟华
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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