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 produc

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] The raw material composition of this environmentally-friendly waterborne polyurethane adhesive preparation method is calculated by mass percentage:

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

[0024] A hydrophobic chain extender with a number average molecular weight of 61-400 0.1-10%,

[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] The preparation process is as follows:

[0033] (a) Add the polymerized glycol, hydrophobic chain extender, internal crosslinking agent, and hydrophilic chain extender into the reactor, under the protection of nitrogen, heat up to 110~120℃, vacuum dehydration for 15~30 minutes ;

[0034] (b) Cool to 50~60℃, add diisocyanate, the molar ratio of diisocyanate to active hydrogen compound can be controlled at (1.1~3.5)...

Example Embodiment

[0048] Example one

[0049] 1. The polyoxypropylene glycol 160g (number average molecular weight is 2000), the hydrophobic small molecule chain extender neopentyl glycol 4.16g, the internal crosslinking agent trimethylolpropane 0.54g, the hydrophilic chain extender two Add 8.58g of DMPA to a four-neck reactor equipped with a thermometer, a condenser and a stirring device. Under the protection of nitrogen, the temperature is raised to 120°C, dehydrated under vacuum for 30 minutes, cooled to 60°C, and added 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, react for 3 hours.

[0050] 2. Under the action of high-speed shearing force (stirring speed at 2000r / min), add the neutralizer triethylamine aqueous solution (triethylamine 3.88g, deionized water 520g) into the reaction kettle, neutralizer three The molar rati...

Example Embodiment

[0051] Example two

[0052] 1. Add 160g of polyoxyethylene glycol (number average molecular weight of 2000), 4.16g of neopentyl glycol, 0.54g of trimethylolpropane, and 8.58g of dimethylolpropionic acid into the reactor, under the protection of nitrogen After heating to 120°C, vacuum dehydration for 30 minutes, cooling to 60°C, adding 45.91g of isophorone diisocyanate (the molar ratio of diisocyanate to active hydrogen compound is 1.1:1), reacting at 90°C for 2 hours, and then The temperature was lowered to 80° C., 0.05 g of tetraisopropanol titanate was added and reacted for 3 hours.

[0053] 2. Under the action of high-speed shearing force (stirring speed at 2000r / min), add the aqueous solution of triethylamine (triethylamine 3.88g, deionized water 520g) into the reaction kettle and stir for 15 minutes to obtain a viscosity of A translucent waterborne polyurethane adhesive with 40CPS / 25°C, 30.10% solid content, 7.5 pH, and no 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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