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Polyisocyanate curing agent and preparation method thereof

A polyisocyanate and diisocyanate technology, applied in the field of polyisocyanate curing agent and preparation, can solve the problems of difficulty in rapid and uniform dispersion, affecting the efficiency of the curing agent, insufficient water resistance and adhesion, etc. Good dispersion effect

Inactive Publication Date: 2010-02-17
广州市合工大实力新材料研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in sports venues and other outdoor occasions that require high performance of water-based polyurethane surface materials, although 8% of the above-mentioned hydrophilic modified trimer curing agent is added to the water-based polyurethane emulsion, due to the hydrophilic modification of the three The polymer curing agent is difficult to quickly and uniformly disperse in the emulsion system with high viscosity, and the side reaction of active isocyanate and water during the curing film formation process and the molecular structure of the trimer are difficult to form a high-density interpenetrating network molecular structure in the emulsion system. The efficiency of the curing agent is compromised, and the mechanical properties, water resistance and adhesion of the waterborne polyurethane surface material for sports venues are still insufficient.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In the present invention, a branched polyisocyanate is first generated through the chemical reaction between diisocyanate, trihydric alcohol and dihydric alcohol in a cosolvent, and then the branched polyisocyanate is combined with a hydrophilic chain extender in the presence of a catalyst. A hydrophilic functional group is introduced through a chain extension reaction, the resulting product is blocked by isocyanate, neutralized to form a salt, and a viscosity-reducing protective solvent is added to reduce the viscosity to obtain the polyisocyanate curing agent.

[0036] In the 250ml flask that thermometer is housed, stirrer, reflux condenser, add 5g trimethylolpropane, 2g neopentyl glycol, 34g 1,6-hexamethylene diisocyanate, 10g N-methylpyrrolidone, under nitrogen protection, Reaction at 80-85°C for 3 hours to obtain branched polyisocyanate.

[0037] Then add 6g of dimethylolpropionic acid containing hydrophilic groups and 0.02g of dibutyltin dilaurate, react at 70-75°...

Embodiment 2

[0041] In the 500ml flask that thermometer is housed, stirrer, reflux condenser tube, add 12g trimethylolpropane, 2g neopentyl glycol, 98g isophorone diisocyanate, 40g N-methylpyrrolidone, under nitrogen protection, in Reaction at 80-85°C for 3 hours to obtain branched polyisocyanate.

[0042] Subsequently, 12 g of dimethylolpropionic acid containing hydrophilic groups and 0.05 g of dibutyltin dilaurate were added, reacted at 70-75° C. for 2 hours, and samples were taken to analyze the content of free isocyanate.

[0043] 10.6 g of 2-methylimidazole was added, and after isocyanate blocking reaction at 60-65° C. for 1 hour, the blocking rate of free isocyanate was 80%. At room temperature, 5.4 g of triethylamine was added for neutralization, and the degree of neutralization was 0.6. 60 g of butyl acetate was added under stirring to obtain a branched polyisocyanate curing agent of aliphatic diisocyanate. Appearance is light yellow liquid with a solid content of 58% and a visco...

Embodiment 3

[0045] Add 5g trimethylolpropane, 2g neopentyl glycol, 17g 1,6-hexamethylene diisocyanate, 22.4g isophorone diisocyanate, 20g N- Methylpyrrolidone, under the protection of nitrogen, reacted at 80-85°C for 3 hours to obtain branched polyisocyanate.

[0046] Subsequently, 4 g of dimethylolpropionic acid containing hydrophilic groups and 0.02 g of dibutyltin dilaurate were added, reacted at 70-75° C. for 2 hours, and samples were taken to analyze the content of free isocyanate.

[0047] 8g of 2-methylimidazole was added, and after isocyanate blocking reaction at 60-65°C for 1 hour, the blocking rate of free isocyanate was 100%. At room temperature, 2.4 g of triethylamine was added for neutralization, and the degree of neutralization was 0.8. Add 40g of butyl acetate under stirring to prepare a branched polyisocyanate curing agent mixed with aliphatic diisocyanate. Appearance is light yellow liquid, its solid content is 50%, viscosity 45MPa.S.

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Abstract

The invention relates to a polyisocyanate curing agent and a preparation method thereof, belonging to the curing agent field. The preparation method comprises the following steps: adopting diisocyanate monomer and a mixture of divalent alcohol and trivalent alcohol to react in cosolvent and obtain branched polyisocyanate, performing hydrophilic chain-extending reaction in the presence of catalyst,adding sealing agent to seal end and protect, adding neutralizer for neutralization and salt-formation, using a small amount of visbreaking protective solvent for dilution to ensure the total mass content to be 50-70% and preparing the ionic room temperature hydrolysis capped polyisocyanate curing agent, wherein, the molar ratio of diisocyanate monomer to divalent alcohol and trivalent alcohol 1:0.1-0.4:0.01-0.20. The invention is a polyisocyanate curing agent with low viscosity, good dispersibility and dendritic molecular structure which can increase the mechanical properties, water resistance and adhesive force of waterborne polyurethane surface material in sport fields and meet the pavement demand of sport fields and venues.

Description

technical field [0001] The polyisocyanate curing agent and the preparation method of the invention belong to the field of curing agents. Background technique [0002] With the enhancement of human environmental awareness, it is an inevitable trend and demand for water-based polyurethane materials to replace traditional solvent-based polyurethanes. During the preparation process of water-based polyurethane materials, due to the introduction of hydrophilic groups such as carboxyl groups into the polymer chain structure, the water resistance of the materials is significantly reduced. At present, it cannot replace solvent-based polyurethane materials for outdoor applications such as sports ground paving. In order to solve the problems of water-based polyurethane materials in water resistance, hardness, adhesion, etc., water-based two-component polyurethane composed of hydrophilic modified polyisocyanate curing agent and water-based polyurethane emulsion is the direction of resea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/32C08G18/12C08G18/80
Inventor 吕建平李永麟梁亚平邓俊李红才刘明星周静静
Owner 广州市合工大实力新材料研究院有限公司
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