Preparation method of environmentally-friendly aqueous polyurethane adhesive

A water-based polyurethane and adhesive technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of inconvenience for large-scale production, increase production costs, and difficulty in operation, and achieve energy saving, The initial viscosity is strong, and the effect of not easy to agglomerate and precipitate

Active Publication Date: 2011-06-22
JIAXING HEXIN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process required by the preparation method is very complicated, the operation is difficult, and the requirements for workers are very high, it is not convenient for large-scale production, and a large amount of organic solvent N-methylpyrrolidone (NMP) is used in the preparation process, which increases the production cost. and cause great pollution to the environment

Method used

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  • Preparation method of environmentally-friendly aqueous polyurethane adhesive
  • Preparation method of environmentally-friendly aqueous polyurethane adhesive

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preparation example Construction

[0022] The raw material composition of the preparation method of this environment-friendly water-based polyurethane adhesive is calculated in mass percentage as:

[0023] Number-average molecular weight is 10-50% of polymerized diols with a molecular weight of 500-5000,

[0024] The number average molecular weight is 0.1~10% of the hydrophobic chain extender of 61~400,

[0025] Internal crosslinking agent 0~5%,

[0026] Hydrophilic chain extender 0.1~10%,

[0027] Diisocyanate 2~30%,

[0028] Catalyst 0.001~0.1%,

[0029] Organic solvent 0~10%,

[0030] Neutralizer 0.2~5%;

[0031] Deionized water 40-80%;

[0032] Its preparation process is as follows:

[0033] (a) Add polymeric diol, hydrophobic chain extender, internal crosslinking agent, and hydrophilic chain extender into the reaction kettle, raise the temperature to 110-120°C under the protection of nitrogen, and vacuum dehydrate for 15-30 minutes ;

[0034] (b) Cool to 50-60°C, add diisocyanate, the molar ratio ...

Embodiment 1

[0049] 1. Polyoxypropylene glycol 160g (number average molecular weight is 2000), hydrophobic small molecule chain extender neopentyl glycol 4.16g, internal crosslinking agent trimethylolpropane 0.54g, hydrophilic chain extender II Add 8.58 g of methylolpropionic acid (DMPA) into a four-port reaction kettle equipped with a thermometer, a condenser, and a stirring device. Under the protection of nitrogen, heat up to 120°C, vacuum dehydrate for 30 minutes, cool to 60°C, and add 45.91g isophorone diisocyanate (IPDI) (the molar ratio of diisocyanate to active hydrogen compound is 1.1:1), react at 90°C for 2 hours, then lower the temperature to 80°C, add 0.05g tetraisopropyl titanate Alcohol ester, reacted for 3 hours.

[0050] 2. Under the action of high-speed shear force (stirring speed at 2000r / min), the aqueous solution of neutralizing agent triethylamine (triethylamine 3.88g, deionized water 520g) is added in the reaction kettle, neutralizing agent three The molar ratio of et...

Embodiment 2

[0052] 1. Add 160g of polyoxyethylene diol (the number average molecular weight is 2000), 4.16g of neopentyl glycol, 0.54g of trimethylolpropane, and 8.58g of dimethylol propionic acid into the reactor, under the protection of nitrogen , heat up to 120°C, vacuum dehydrate for 30 minutes, cool to 60°C, add 45.91g of isophorone diisocyanate (the molar ratio of diisocyanate to active hydrogen compound is 1.1:1), react at 90°C for 2 hours, and then Lower the temperature to 80° C., add 0.05 g of tetraisopropanol titanate, and react for 3 hours.

[0053] 2. Under the effect of high-speed shear force (stirring speed at 2000r / min), the aqueous solution of triethylamine (3.88g of triethylamine, 520g of deionized water) is added in the reaction kettle, stirred for 15 minutes, and the obtained viscosity is 40CPS / 25℃, solid content 30.10%, pH value 7.5, translucent water-based polyurethane adhesive without organic solvents.

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Abstract

The invention discloses a preparation method of an environmentally-friendly aqueous polyurethane adhesive. The environmentally-friendly aqueous polyurethane adhesive is prepared from the following raw materials: polydiol with a number-average molecular weight between 500 and 5,000, a hydrophobic chain extender with a number-average molecular weight between 61 and 400, an inner-crosslinking agent,a hydrophilic chain extender, diisocyanate, a catalyst, an organic solvent, a neutralizing agent and deionized water. The preparation process comprises: heating the polydiol, the hydrophobic chain extender, the inner-crosslinking agent and the hydrophilic chain extender in a protective atmosphere of nitrogen, dewatering under vacuume and cooling; adding diisocyanate for reaction, cooling and adding a catalyst for a reaction; adding a proper amount of organic solvent for regulating viscosity; and adding aqueous solution of the neutralizing agent under the action of a high-speed shearing force to obtain the product. The product has the advantages of extremely low organic solvent content, high stability, insusceptibility to agglomeration and sedimentation, long storage period and low thermalactivation temperature, can be used for dry type combination and has the characteristics of high initial viscosity, high flexibility, high breathability, light odor and the like.

Description

technical field [0001] The invention relates to a preparation method of an environment-friendly water-based polyurethane adhesive, more specifically, it is a method for preparing a water-based polyurethane adhesive with low activation temperature, high physical properties and high initial viscosity without adding or adding very little organic solvent method. Background technique [0002] Waterborne polyurethane (PU) is a two-phase colloid system in which PU particles are dispersed in an aqueous medium. It is a polymer material developed by replacing organic solvents with water as a dispersion medium. Compared with solvent-based polyurethane, water-based polyurethane retains some excellent properties of traditional solvent-based polyurethane, such as good wear resistance, flexibility, low temperature resistance and fatigue resistance, etc. It is suitable for various metals, plastics, glass, leather, Textiles, wood, etc. have good adhesion, and at the same time have a series ...

Claims

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Application Information

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IPC IPC(8): C09J175/04C09J175/06C09J175/08C08G18/65C08G18/66
Inventor 朱崇恩沈连根徐欣欣石磊王卫冬纪尚超李寿伟
Owner JIAXING HEXIN CHEM IND
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