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Synthetic method of aqueous polyurethane adhesive

A technology of water-based polyurethane and synthesis method, applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., can solve the problems of shortening the service life, reducing the water resistance and performance of the adhesive, reducing the cost of raw materials, The effect of improving product performance and high mechanical strength

Inactive Publication Date: 2008-11-12
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. In water-based polyurethane adhesives, the use of expensive aliphatic isocyanates increases the production cost of the adhesive
[0004] 2. When preparing water-based polyurethane adhesives, the use of compounds containing hydrophilic groups reduces the water resistance of the adhesive and shortens the service life
[0005] 3. The high activity of aromatic isocyanate leads to the complexity of the preparation process of water-based polyurethane adhesives, which limits its wide application in industry and life
However, the above-mentioned modification methods inevitably leave unreacted modifier monomers in the water-based polyurethane. The existence of unreacted monomers leads to the reduction of final performance and pollutes the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Under stirring at room temperature, mix styrene, castor oil, polybutylene adipate (molecular weight 2000) and initiator azobisisobutyronitrile evenly, and the mass ratio of styrene and polyester diol is 1:8 , the mass ratio of castor oil and polyester diol is 1:100, the mass ratio of azobisisobutyronitrile and polymerized monomer is 0.1:100, after reacting at 80°C for 10h, the polystyrene modified of polyester diol;

[0023] Add 0.02mol polybutylene adipate containing polystyrene modification to a three-necked flask filled with 0.04mol DMPA and 0.9mol acetone; add 0.05molMDI and 0.07mol IPDI under stirring at room temperature; heat to acetone Reflux temperature, after reacting for 3 hours, add 0.048mol 1,3-propanediol; continue to react for 2 hours, then cool down to room temperature, add 0.04mol triethylamine to neutralize the carboxyl group; after 20min, add 20mol deionized water and 0.012mol ethylamine Diamine; After dripping, continue to stir vigorously for 10 minu...

Embodiment 2

[0025] Under stirring at room temperature, styrene, castor oil, polytrimethylene adipate (molecular weight 2000) and initiator azobisisobutyronitrile are mixed uniformly, and the mass ratio of styrene and polyester diol is 5: 8, castor The mass ratio of sesame oil to polyester diol is 5:100, and the mass ratio of azobisisobutyronitrile to polymerized monomer is 1:100. After reacting at 130°C for 8 hours, polystyrene-modified polystyrene is prepared under reduced pressure. Ester diol;

[0026] Add 0.02mol polytrimethylene adipate containing polystyrene modification to a three-necked flask filled with 0.03mol DMPA and 0.9mol acetone; add 0.03molMDI, 0.09mol HDI and 0.9mol solvent acetone while stirring at room temperature; Heating to the reflux temperature of acetone, after reacting for 2 hours, add 0.052mol ethylene glycol; continue to react for 2 hours at the reflux temperature of acetone, then lower to room temperature, add 0.03mol triethylamine to neutralize the carboxyl gro...

Embodiment 3

[0028] Under stirring at room temperature, styrene, acrylonitrile, castor oil, polyhexamethylene adipate (molecular weight 2000) and initiator azobisisobutyronitrile are mixed uniformly, and the total mass of styrene and acrylonitrile is mixed with polyester The mass ratio of diol is 5: 8, the mass ratio of castor oil and polyester diol is 2: 100, the mass ratio of azobisisobutyronitrile and polymerization monomer is 5: 100, after 100 ℃ of reaction 10h, Decompression makes polystyrene-acrylonitrile modified polyester diol;

[0029] Add 0.02mol poly(hexanediol adipate) modified with polystyrene-acrylonitrile into a three-necked flask filled with 0.06mol DMPA and 1.5mol acetone; add 0.06mol MDI and 0.06mol H under stirring at room temperature 12 MDI; heated to the reflux temperature of acetone, after 4 hours of reaction, add 0.028mol 1,4-butanediol; continue to react at the reflux temperature of acetone for 3 hours, then cool down to room temperature, add 0.06mol triethylamine t...

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Abstract

The invention relates to a method for synthesizing aqueous polyurethane adhesives. The method is as follows: firstly, monomer polymer, castor oil, polyester glycol and initiator are uniformly mixed, and modified polyester glycol is prepared after heating reaction and decompression; secondly, the modified polyester glycol is uniformly mixed with acetone, dimethylol propionic acid, diphenylmethane vulcabond and aliphatic vulcabond; after the mixture is heated to the acetone reflux temperature and reacted for 2 to 4 hours, micromolecular glycol is added; reaction is continued at the acetone reflux temperature; after the temperature is reduced to the room temperature, triethyl ammonia is added into the mixture to neutralize the dimethylol propionic acid; after the mixture is stirred for 10 to 30 minutes at the room temperature, deionized water and ethylenediamine are added; after the mixture is strongly stirred for 30 to 60 minutes, the mixture is heated to the acetone reflux temperature for reaction, and the product is obtained after temperature rise, decompression and acetone removal. The product prepared has the advantages of high initial bonding strength and good water resistance.

Description

technical field [0001] The invention belongs to a method for synthesizing a water-based polyurethane adhesive, in particular to preparing the water-based polyurethane adhesive by reacting isocyanate with modified polyester diol and small molecule diol. technical background [0002] Water-based polyurethane is a kind of polymer material with excellent performance. It is solvent-free, odorless, pollution-free, non-combustible, and its softness and hardness can be adjusted well, and it is easy to blend with other polymers, especially emulsion polymers. It is beneficial to modification and other advantages. It is widely used in adhesives, coatings, paper coatings, steel antirust, leather finishing agents, fiber or fabric treatment agents, glass surface treatment agents, etc., among which it is most widely used in the fields of adhesives and coatings. Although water-based polyurethane accounts for a large proportion of adhesives, there are still some problems to be solved: [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C08G18/42C08G18/74
Inventor 亢茂青杜辉王军威赵雨花
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI