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Aqueous polyurethane adhesive for bead planting and preparation method thereof

A water-based polyurethane and adhesive technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problem of water resistance reduction of reflective fabrics, achieve moderate bonding strength, and improve hydrolysis resistance. , the effect of low curing temperature

Inactive Publication Date: 2012-03-28
BEIJING COMENS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a main agent of water-based polyurethane adhesive for bead planting and its preparation method and adhesive, which can solve the problem of greatly reducing the water resistance of reflective cloth in water washing caused by the current water-emulsion acrylate system bead planting adhesive The problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0057] The preparation method of the above-mentioned water-based polyurethane adhesive for planting beads specifically comprises the following steps:

[0058] Prepare the main ingredient:

[0059] Take and prepare each component of the main agent: polytetrahydrofuran diol with a weight average molecular weight of 2000, toluene diisocyanate, epoxy resin EP-51, dimethylol propionic acid, diethylene glycol, triethylamine, ethylene glycol Amines, solvents and defoamers;

[0060] After vacuum dehydration of polytetrahydrofuran diol, add toluene diisocyanate, mix well, react at 80-85°C for 1 hour, then add epoxy resin EP-51, dimethylol propionic acid and diethylene glycol, add Solvent, react at constant temperature for 3 hours to obtain a prepolymer, detect that the NCO mass percentage of the prepolymer reaches the theoretical value, then start to cool down, the temperature drops to 40°C, add triethylamine to neutralize and form a salt for 5 to 10 minutes, use Ionized water is dispe...

Embodiment 1

[0082] This example provides a preparation method of a water-based polyurethane adhesive for planting beads. This adhesive can meet the transfer of glass beads on reflective materials, and the bonding strength is moderate. Compared with the solvent-based and water-based acrylic used in the industry before , more safe and environment-friendly, and energy consumption is reduced, and this method comprises the following steps:

[0083] After vacuum dehydrating 200kg of polytetrahydrofuran diol (weight-average molecular weight: 2000), add 42kg of toluene diisocyanate, mix well, heat up, react at 80-85°C for 1 hour, then add 20kg of epoxy resin EP-51, 12kg of DMPA and 3.6kg of diethylene glycol, then add 20kg of methyl ethyl ketone (solvent), react at a constant temperature of 80-85°C for 3 hours, take a sample to detect that the NCO% of the product is 2% and reach the theoretical value, then start to cool down , the temperature will drop to 40°C, add 8.2kg of triethylamine to neutr...

Embodiment 2

[0086] This example provides a preparation method of a water-based polyurethane adhesive for planting beads. This adhesive can meet the transfer of glass beads on reflective materials, and the bonding strength is moderate. Compared with the solvent-based and water-based acrylic used in the industry before , more safe and environment-friendly, and energy consumption is reduced, and this method comprises the following steps:

[0087] After vacuum dehydrating 185kg of polytetrahydrofuran diol (weight-average molecular weight: 2000), add 40kg of toluene diisocyanate, mix well, heat up, react at 80-85°C for 1 hour, then add 25kg of epoxy resin EP-51, 14.25kg of DMPA and 8.55kg of diethylene glycol, then add 20kg of acetone (solvent), and react at a constant temperature of 80-85°C for 3 hours, and the NCO% of the product detected by sampling is 1.9% and reaches the theoretical value, then start to cool down , the temperature will drop to 40°C, add 11.4kg of triethylamine to neutrali...

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Abstract

The invention discloses an aqueous polyurethane adhesive for bead planting and a preparation method thereof, which belong to the field of adhesive preparation. After polyether polyol and isocyanic acid react for a certain period of time, epoxy resin, hydrophilic chain extender and diglycol are added, prepolymer is produced after a certain period of reaction, solvent is added to decrease the viscosity of the prepolymer, neutralization for salification, emulsification and secondary chain extension are then carried out, the solvent is removed by vacuum, and thereby main agent is prepared; the main agent is mixed with curing agent according to a certain proportion by weight, and thereby the aqueous polyurethane adhesive for the bead planting is prepared. By choosing the hydrolysis-resistant polyether polyol, the method enhances the hydrolysis resistance of the aqueous polyurethane adhesive by means of epoxy modification, moreover, the produced adhesive film is not sticky, the bonding strength is moderate, and the properties of the aqueous polyurethane adhesive for the bead planting are excellent.

Description

technical field [0001] The invention relates to the field of adhesive preparation, in particular to a water-based polyurethane adhesive for bead planting and a preparation method thereof. Background technique [0002] In the field of reflective material beads, most manufacturers are still using two-component solvent-based acrylic adhesives. However, two-component adhesives need to be matured after being off the machine, and the energy consumption is very high; a large amount of solvents are directly discharged during use, causing great environmental pollution; in the composite peeling stage, the transfer rate of microbeads is not easy to control, resulting in insufficient reflectance of the final product; curing The use of additives makes the curing temperature higher and also increases the risk of operation. [0003] At present, the water-emulsion type acrylate system bead-planting adhesive has been used. The adhesive uses water as a solvent, which eliminates the pollution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C08G18/76C08G18/66C08G18/48C08G18/32C08G18/34
Inventor 张淑萍沈峰
Owner BEIJING COMENS NEW MATERIALS
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