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Preparation method and application of aqueous polyurethane latex as vacuum plastic-absorption adhesive

A water-based polyurethane and emulsion technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of PVC decorative leather peeling off, unfavorable wide practical application, and increase production costs. Water resistance, cost saving, good blending performance

Active Publication Date: 2010-12-22
上海英诺威化学有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For some export products, it is often necessary to carry out ocean transportation in closed containers, especially for transport ships that need to cross the equatorial circle, the temperature inside the container can reach 80-90 ° C, if the high temperature resistance of the glue is not enough, it is easy to cause export The PVC decorative skin of the product is peeled off, making the product scrapped
The conventional practice is to add 3 to 5% curing agent to improve the heat resistance during the use of the glue, but this will increase the production process and increase the production cost, which is not conducive to wide practical application

Method used

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  • Preparation method and application of aqueous polyurethane latex as vacuum plastic-absorption adhesive
  • Preparation method and application of aqueous polyurethane latex as vacuum plastic-absorption adhesive
  • Preparation method and application of aqueous polyurethane latex as vacuum plastic-absorption adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Additives and amounts added in the preparation process:

[0037]

[0038]

[0039] The raw material polyester polyol in this example is prepared from adipic acid and 1,4-butanediol, its molecular weight is 2000, its hydroxyl value is 56±1 mgKOH / g, and its OH functionality is 2. Fill the above-mentioned polyester polyol, IPDI, HDI and catalyst dibutyltin dilaurate into a 1000ml flask equipped with a thermometer and a stirrer, and react at 80° C. for 2.5 hours to obtain a prepolymer. Then add DMPA and co-solvent NMP, and react at 65°C for 4 hours. Then add TEA for neutralization, add the neutralized prepolymer into deionized water to disperse, and maintain emulsification for 2 minutes after adding, then add EDA for chain extension, the adding time is 8 minutes, and disperse for 45 minutes after adding, to obtain A kind of water-based polyurethane emulsion, its solid content is 46.5%, Ph=7.1, viscosity (27 ℃)=150mPa.s, bond strength (PVC / PVC)=3.9N / mm, bond strength (P...

Embodiment 2

[0041] Additives and amounts added in the preparation process:

[0042]

[0043]

[0044] The raw material polyester polyol in this example is prepared from adipic acid and 1,4-butanediol, its molecular weight is 2000, its hydroxyl value is 56±1 mgKOH / g, and its OH functionality is 2. Put polyester polyol, IPDI, HDI and catalyst dibutyltin dilaurate in the 1000ml flask that is equipped with thermometer, stirrer, react at 80 ℃ for 2.5 hours to obtain prepolymer. Then add DMPA and co-solvent NMP, react at 65°C for 4.5 hours. Then add TEA for neutralization, add the neutralized prepolymer into deionized water to disperse, keep it for 2 minutes after the addition, then add EDA for chain extension, the addition time is 10 minutes, and disperse for 45 minutes after the addition, to obtain a A kind of aqueous polyurethane emulsion, its solid content is 48.5%, Ph=7.1, viscosity (27 ℃)=235mPa.s, bonding strength (PVC / PVC)=3.6N / mm, bonding strength (PVC / MDF) =2.0N / mm, the activa...

Embodiment 3

[0046] Additives and amounts added in the preparation process:

[0047]

[0048]

[0049] The raw material polyester polyol in this example is prepared from adipic acid and 1,4-butanediol, its molecular weight is 2000, its hydroxyl value is 56±1 mgKOH / g, and its OH functionality is 2. Put polyester polyol, IPDI and catalyst tin octoate into the 1000ml flask equipped with thermometer and stirrer, and react at 85°C for 3 hours to obtain prepolymer. Then add DMPA and co-solvent NMP, react at 60°C for 5 hours. Then add TEA for neutralization, add the neutralized prepolymer into deionized water to disperse, keep it for 2 minutes after the addition, then add EDA for chain extension, the addition time is 5 minutes, and disperse for 45 minutes after the addition, to obtain a A kind of aqueous polyurethane emulsion, its solid content is 49.5%, Ph=7.3, viscosity (27 ℃)=175mPa.s, bonding strength (PVC / PVC)=4.1N / mm, bonding strength (PVC / MDF) =2.3N / mm, the activation temperature i...

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Abstract

The invention relates to a preparation method and application of aqueous polyurethane latex as a vacuum plastic-absorption adhesive in the field of fine polymer materials. The preparation method comprises the following steps of: (1) making polyester polyol and isocyanate as raw materials react in the presence of a catalyst to obtain a prepolymer, wherein the molar ratio of the polyester polyol tothe isocyanate is 2-2.35:1, and the catalyst accounts for 0.01% of the total weight of the prepolymer; (2) adding dimethylolpropionic acid containing a hydrophilic group compound, simultaneously adding N-methylpyrrolidone as a cosolvent and making the mixture to react to obtain a product, wherein the addition of the cosolvent accounts for 1%-3% of the total weight of the latex; (3) adding triethylamine for neutralization reaction, adding deionized water, and then emulsifying; and (4) adding an amine chain expander and then dispersing to obtain the aqueous polyurethane latex. The product prepared in the method has the advantages of low cost, stable viscosity, moderate activation temperature, good blending performance and better high-temperature resistance and bonding strength and can be applied as the vacuum plastic-absorption adhesive.

Description

technical field [0001] The invention relates to a preparation method in the field of fine polymer materials, in particular to a preparation method of an aqueous polyurethane emulsion and its application as an adhesive for vacuum suction plastic. Background technique [0002] Water-based polyurethane emulsion can be used alone as a vacuum plastic, or it can be compounded with ethylene-vinyl acetate emulsion to form a vacuum plastic, but so far it is mainly compounded. The general use process of vacuum plastic absorbing plastic: put the PVC film close to the sprayed medium density fiberboard during the heating and softening process, use vacuum to remove the air between the PVC film and the medium density fiberboard, and rely on atmospheric pressure to make the PVC film stick tightly on it. On MDF, this process is called vacuum blistering. The main indicators of water-based polyurethane emulsion applied to vacuum plastics are: (1) viscosity stability; (2) activation performanc...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/42C08G18/10C09J175/06
Inventor 李小云严健强李钢东燕雯访
Owner 上海英诺威化学有限公司
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