Method for preparing aqueous polyurethane-acrylate composite emulsion

A water-based polyurethane and acrylate technology is applied in the field of preparation of water-based polyurethane-acrylate composite emulsions to achieve the effects of good initial adhesion, improved water resistance and fast drying.

Active Publication Date: 2010-12-08
GUANGDONG RITOP FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the preparation of waterborne polyurethane-acrylate composite emulsion with high solid content (above 45%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Preparation of polyester waterborne polyurethane-acrylate composite emulsion

[0021] First put 25.6g of PBA in a 250mL three-necked flask, and remove water under vacuum at 120°C for 1h. Stop the vacuum and vent nitrogen, add 1.304g DMBA, and continue heating until all of it is dissolved. Cool to 80°C, add 2.26mL IPDI and 3.46mL HDI, and react for 3.5h at 80°C and 300 r / min stirring to obtain an aqueous polyurethane prepolymer; lower the temperature to 70°C, add 0.82 g HEMA, and continue the reaction for 1h. Cool down to 60°C, add 0.85g TEA, and react for 20 minutes. 63 mL of water was added dropwise to the reaction system, stirred and emulsified at 400 r / min to obtain a pre-emulsion, 0.265 g of EDA was dissolved in 6.3 mL of water, and then added dropwise to the above-mentioned pre-emulsion, and reacted for 30 minutes to obtain an aqueous polyurethane dispersion. Then at 79°C and stirring (300r / min), 22.68g of BA solution with 0.204g of AIBN dissolved in the ...

Embodiment 2

[0022] Example 2: Preparation of polyether waterborne polyurethane-acrylate composite emulsion

[0023] Follow the same preparation method as in Example 1, except that 25.6g PBA is changed to 25.6g PPG, and 22.68g BA is changed to 22.68g MMA. The obtained composite emulsion has a solid content of 45%, a viscosity of 45.4cP, an average particle size of 138.9nm, a transparent film, a tensile strength of 14.2MPa, an elongation at break of 452.5%, and a water absorption rate of 3.00% at 25°C for 24 hours. The water absorption rate at 60℃36h is 15.22%.

Embodiment 3

[0024] Example 3: Preparation of polyester / polyether waterborne polyurethane-acrylate composite emulsion

[0025] Follow the same preparation method as in Example 1, but change 25.6g PBA to 20.48g PBA and 5.12g PPG. The obtained composite emulsion has a solid content of 45%, a viscosity of 93.2 cP, an average particle size of 93.1nm, a tensile strength of 7.1MPa, an elongation at break of 882.8%, a water absorption rate of 1.91% at 25°C for 24 hours, and water absorption at 60°C for 36 hours. The rate is 7.53%.

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Abstract

The invention discloses a method for preparing aqueous polyurethane-acrylate composite emulsion. The method comprises the following steps of: synthesizing aqueous polyurethane prepolymer by using dihydric alcohol polymer, diisocyanate and hydrophilic chain extender in the absence of a metal catalyst and an organic solvent, blocking ends of the prepolymer by using a vinyl compound, then neutralizing the polymer, dripping water into the polymer to perform self-emulsification, extending the chain to obtain aqueous polyurethane dispersion, and dripping initiator dissolved acrylate monomer into the dispersion in the absence of additional emulsifier to perform polymerization so as to obtain the aqueous polyurethane-acrylate composite emulsion with high solid content. The solid content of the composite emulsion is over 45 percent; and the preparation process does not use any solvent or metal catalyst, has no pollutant discharge, and is a pollution-free production process. The obtained environmentally-friendly aqueous polyurethane-acrylate composite emulsion with high solid content can be used as adhesive, coating and the like.

Description

technical field [0001] The invention relates to a preparation method of a polymer emulsion, in particular to a preparation method of an aqueous polyurethane-acrylate composite emulsion. Background technique [0002] Polyurethane is a kind of polymer material with excellent performance. It has the advantages of low temperature resistance, chemical corrosion resistance, friction resistance and good flexibility. It has been widely used as coatings, adhesives and fabric finishing agents. Traditional polyurethane materials are mainly solvent-based, and the organic solvents used generally have disadvantages such as flammability, explosion, strong smell, and toxicity, and are likely to cause harm to human health and the environment during production and use. Water-based polyurethane materials, which began to appear in the 1970s and developed rapidly, have the advantages of low toxicity, non-flammability, and low pollution compared with traditional solvent-based polyurethanes. With...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08G18/12
Inventor 卢江何迪宏梁晖徐文烈
Owner GUANGDONG RITOP FINE CHEM
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