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Preparation method of dual-component aqueous polyurethane adhesive agent

A water-based polyurethane, two-component technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problem that the cohesive strength of water-based polyurethane adhesives is not too high, and cannot meet the requirements of high-strength bonding, etc. problem, to achieve the effect of low cost and elimination of impact

Inactive Publication Date: 2008-05-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the cohesive strength of a single water-based polyurethane adhesive is not too high or low, and cannot meet the needs of high-strength bonding requirements, so it must be modified

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] React 100g of TDI and 246g of polyoxypropylene diol with a molecular weight of 1000 at 60°C for 2h, then add 17.5g of dimethylol propionic acid, and react for 2h to obtain a polyurethane prepolymer; add 11.2g of triethylene glycol to the prepolymer amine, and then add 10 g of rosin pentaerythritol ester, and the neutralization time is 10 minutes to obtain a neutralized polyurethane prepolymer. Then lower the temperature to 35° C., add 870 g of water at a speed of 2500 r / min, and disperse for 10 min to obtain a water-based polyurethane dispersion. Add 38g of methyl methacrylate and 0.38g of potassium persulfate uniformly dropwise to the aqueous polyurethane dispersion, react at 70°C for 3h, then raise the temperature to 80°C for 1 hour, cool down to room temperature, discharge and filter to obtain aqueous Polyurethane dispersion.

[0029] Add 1g of leveling agent SAN2 and 0.5g of defoamer ATF-2 to 100g of the waterborne polyurethane dispersion prepared above, and then m...

Embodiment 2

[0035] 100g of HDI and 403g of polybutadiene ester diol were reacted at 70°C for 2h, then 25g of dimethylolacetic acid was added, and reacted for 2h to obtain a polyurethane prepolymer; 27.3g of triethylamine was added to the prepolymer, and then 25g rosin glyceride, neutralization time is 20min, obtains the polyurethane prepolymer of neutralization. Then lower the temperature to 40°C, add 1400g of water at 4500r / min to disperse for 30min to obtain a water-based polyurethane dispersion. Evenly add 150g of ethyl acrylate and 0.9g of potassium persulfate to the water-based polyurethane dispersion, react at 75°C for 3h, then raise the temperature to 85°C for 1.2h, cool down to room temperature, discharge and filter to obtain water-based polyurethane dispersion body.

[0036] Add 0.1g of leveling agent SAN1 and 0.1g of defoamer ATF-1 to 100g of the waterborne polyurethane dispersion prepared above, and mix with 5g of curing agent PUDS81, and stir evenly to obtain a two-component ...

Embodiment 3

[0042] 100g of IPDI and 353g of polyethylene adipate diol were reacted at 80°C for 3h, then 20g of dimethylol butyric acid was added, and reacted for 5h to obtain a polyurethane prepolymer; 18.7g of triethanolamine was added to the prepolymer , and then add 15g of rosin pentaerythritol ester, and the neutralization time is 20min to obtain a neutralized polyurethane prepolymer. Then lower the temperature to 40°C, add 941g of water at a speed of 4500r / min, and disperse for 30min to obtain a water-based polyurethane dispersion. Add 100g of hydroxypropyl acrylate and 0.5g of potassium persulfate evenly to the aqueous polyurethane dispersion, react at 75°C for 4h, then raise the temperature to 90°C for 1.5h, cool down to room temperature, discharge and filter to obtain aqueous polyurethane Dispersions.

[0043] Add 0.5g of leveling agent SAN1 and 0.25g of defoamer ATF-2 to 100g of the water-based polyurethane dispersion prepared above, and then mix with 10g of curing agent PUDS82,...

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Abstract

The invention provides a preparation method of double-component water-based polyurethane adhesive. Polyisocyanate and oligomer polyol are added into a reaction device for reaction; then chain extender is added for reaction to prepare polyurethane prepolymer; then neutralizer and rosin are added for neutralization; water is added; a high-speed disperser is used for dispersion and emulsification to prepare water-based polyurethane dispersoid; vinyl monomer and initiator are uniformly dropped for reaction to prepare water-based polyurethane dispersoid modified by rosin and vinyl resin; defoamer and wetting agent are added into the water-based polyurethane dispersoid modified by rosin and vinyl resin; Polyisocyanate curing agent is used for mixing to prepare the double-component water-based polyurethane adhesive. The invention improves the cohesive strength and initial viscosity of the water-based polyurethane adhesive, reduces the cost, and eliminates the influence of molecular emulsifier on the coating.

Description

technical field [0001] The invention relates to a preparation method of a two-component water-based adhesive that can be used in the fields of automobiles, packaging materials, wood, fiber, leather, etc., in particular to a preparation method of a two-component water-based polyurethane adhesive. Background technique [0002] Polyurethane (PU) is a high polymer polymerized by polyisocyanate (mainly diisocyanate) and oligomer polyol. Due to its strong polar carbamate group and the presence of hydrogen bonds between macromolecules, it Polyurethane materials have the characteristics of high strength, wear resistance, and solvent resistance; in addition, by changing the structure and molecular weight of polyols, the properties of polyurethane materials can be adjusted in a wide range. Now polyurethane materials have been widely used in fields such as rubber, plastics and synthetic fibers. [0003] Polyurethane can be divided into solvent-based polyurethane and non-solvent polyur...

Claims

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Application Information

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IPC IPC(8): C09J175/04C09J9/00
Inventor 傅和青夏正斌黄洪沈慧芳陈焕钦
Owner SOUTH CHINA UNIV OF TECH
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