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Preparation method of alkali resistant waterborne polyurethane emulsion

A water-based polyurethane and alkali-resistant technology, which is used in the preparation of alkali-resistant water-based polyurethane emulsions, can solve the problems of few types of polyols, difficult to produce stably, high price, etc. The effect of increasing the flexural strength

Active Publication Date: 2012-11-21
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of cationic quaternary ammonium salt groups is difficult to synthesize and stable production, while polyols containing sulfonic acid groups are rare and expensive, and are not suitable for large-scale production; at the same time, their alkali resistance is only compared with carboxylate Slightly improved water-based polyurethane, severe flocculation still occurs in strong alkaline solution

Method used

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  • Preparation method of alkali resistant waterborne polyurethane emulsion
  • Preparation method of alkali resistant waterborne polyurethane emulsion
  • Preparation method of alkali resistant waterborne polyurethane emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Vacuum dehydrate PPG1000, 1,4-butanediol and DMPA respectively at 100-150°C to ensure that the water content is less than 0.5%. Molecular sieve impregnation dehydration treatment.

[0037] At 60°C, 60 parts by mass of MDI and 20 parts by mass of acetone were added to the reaction vessel, and then a mixture of 70 parts by mass of PPG1000 and 0.065 parts by mass of T-12 was added dropwise within 30 minutes, and the reaction was kept for 3 hours. Then 13 parts by mass of DMPA and 20 parts by mass of acetone were added to react for 1 h; then 0.66 parts by mass of 1,4-butanediol was added dropwise within 20 min and reacted for 1 h. Finally, 6.7 parts by mass of EHA was added dropwise within 20 minutes, and reacted for 1 hour. Wherein, NCO / OH=1.02 in this step reaction.

[0038]After the reaction was completed, the temperature was lowered to 40°C, and 9.8 parts by mass of triethylamine was added dropwise within 20 minutes for neutralization, stirred for 10 minutes, and the...

Embodiment 2

[0041] Vacuum dehydrate PPG1000, 1,4-butanediol and DMPA respectively at 100-150°C to ensure that the water content is less than 0.5%. Molecular sieve impregnation dehydration treatment.

[0042] At 70°C, 60 parts by mass of MDI and 20 parts by mass of acetone were added to the reaction vessel, and then a mixture of 50 parts by mass of PPG1000 and 0.11 parts by mass of T-12 was added dropwise within 30 minutes, and the reaction was kept for 3 hours. Then 8.8 parts by mass of DMPA and 10 parts by mass of acetone were added to react for 1 hour; then 2.8 parts by mass of 1,4-butanediol was added dropwise within 20 minutes and reacted for 1 hour. Finally, 12 parts by mass of EHA was added dropwise within 20 minutes, and reacted for 2 hours. Wherein, NCO / OH=1.2 in this step reaction.

[0043] After the reaction is completed, cool down to 40°C, drop 6.6 parts by mass of triethylamine in 20 minutes for neutralization, stir for 10 minutes, then slowly add the prepolymer solution to...

Embodiment 3

[0046] Vacuum dehydrate PPG1000, 1,4-butanediol and DMPA respectively at 100-150°C to ensure that the water content is less than 0.5%. Molecular sieve impregnation dehydration treatment.

[0047] At 60°C, 60 parts by mass of MDI and 30 parts by mass of acetone were added to the reaction vessel, and then a mixture of 80 parts by mass of PPG1000 and 0.3 parts by mass of T-12 was added dropwise within 30 minutes, and the reaction was kept for 3 hours. Then 9 parts by mass of DMPA and 20 parts by mass of acetone were added to react for 1 h; then 0.26 parts by mass of 1,4-butanediol was added dropwise within 20 min to react for 0.5 h. Finally, 5 parts by mass of EHA was added dropwise within 20 minutes, and reacted for 2 hours. Wherein, NCO / OH=1.3 in this step reaction.

[0048] After the reaction is completed, cool down to 30°C, drop 4 parts by mass of triethylamine in 20 minutes for neutralization, stir for 10 minutes, then slowly add the prepolymer solution to 250 parts by ma...

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Abstract

The invention relates to a preparation method of alkali resistant waterborne polyurethane emulsion. The preparation method comprises pre-polymerizing polyisocyanate and polyol in the presence of catalyst and solvent, adding ionic group compound, reacting, sequentially adding chain expander for chain expansion, blocking ends with hydroxyl-containing unsaturated monomer, neutralizing with salt forming agent to obtain pre-polymer solution, adding water for emulsion, vacuuming, and removing solvent to obtain waterborne polyurethane pre-polymer dispersion; and allowing self polymerization of the waterborne polyurethane pre-polymer dispersion in the presence of colloid protectant, reacting with unsaturated monomer pre-emulsion, cooling, and filtering to obtain alkali resistant waterborne polyurethane emulsion. The inventive alkali resistant waterborne polyurethane emulsion has no condensation product in strongly alkaline condition (pH 13), and can be stably stored for 30 days; and greatly improves the toughness of concrete and improves the flexural strength of concrete by up to 13%.

Description

technical field [0001] The invention relates to a preparation method of alkali-resistant water-based polyurethane emulsion. Background technique [0002] The use of polymer emulsions to modify cement mortar and concrete has a history of 80 years. Polymer emulsions can effectively improve the impermeability, bonding performance, anti-carbonation performance, freeze-thaw resistance and toughness of cement mortar and concrete. Especially with the development of modern buildings with large spans and high-rise buildings, the research on cement mortar and concrete toughness has become a field of widespread concern, making polymer emulsions used in more and more projects. At present, the polymer emulsions used for cement mortar and concrete modification are mainly acrylate emulsion, styrene-butadiene emulsion and polyvinyl acetate emulsion. The toughness of mortar and concrete also makes its strength drop significantly. [0003] Polyurethane (polyurethane) is prepared by stepwise...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/06C08G18/67C04B24/26
Inventor 缪昌文唐文睿丁蓓周栋梁
Owner JIANGSU SOBUTE NEW MATERIALS
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