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Method for synthesizing low-hardness polyurethane acrylate

A technology of polyurethane acrylate and synthesis method, which is applied in the field of synthesis of low-hardness polyurethane acrylate, can solve the problems of high hardness, small molecular weight of resin, limitation of elasticity and flexibility of light-cured film-forming materials, etc., and achieve low curing shrinkage rate, double The effect of low bond density and reasonable control of molecular weight

Inactive Publication Date: 2012-11-21
YANTAI DARBOND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing urethane acrylates are generally difunctional or multifunctional, and the molecular weight of the resin is also small, the elasticity and flexibility of the light-cured film-forming material are greatly limited, and the hardness is relatively high

Method used

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  • Method for synthesizing low-hardness polyurethane acrylate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 56.1 grams of polytetrahydrofuran with a molecular weight of 1000 to a four-necked reaction flask equipped with stirring and a thermometer, vacuum dehydrate at a temperature of 110°C for 2.5 hours, add 0.15 grams of dimethylcyclohexylamine and 11.9 grams of hexamethylene Diisocyanate, stir, slowly increase the temperature and heat, control the temperature at 55 ° C, react for 4 hours, until the content of isocyanate (NCO) is detected to be less than 0.7%, add 0.45 grams of antioxidant β-(3,5-di-tert-butyl -4-hydroxyphenyl) octadecyl propionate and 25.0 g of 2-ethylhexyl acrylate as a diluent, stirred thoroughly for 0.5 hours, and finally added 1.58 g of -β-hydroxyethyl acrylate and 0.63 g of n-butyl Alcohol is used as an end-capping agent, and the reaction is continued at a temperature of 75°C for 2.5 hours, and the temperature is lowered to 40°C to discharge.

Embodiment 2

[0021] Add 125.8 grams of polytetrahydrofuran with a molecular weight of 2000 into a four-necked reaction flask equipped with stirring and a thermometer, vacuum dehydrate at a temperature of 120°C for 2 hours, add 0.22 grams of dibutyltin dilaurate and 15.8 grams of isophorone di Isocyanate, stirring, slowly heating up, controlling the temperature at 70°C, reacting for 3 hours, until the content of isocyanate (NCO) is detected to be less than 0.4%, add 1.05 grams of antioxidant tetrakis[β-(3,5-di-tert-butyl Base-4-hydroxyphenyl)propionic acid]pentaerythritol ester and 60.0 grams of isodecyl acrylate as diluent, fully stirred for 0.5 hours, finally added 1.00 gram of β-hydroxyethyl acrylate and 0.27 gram of ethanol as a capping agent, in Continue to react at 80°C for 2 hours, then cool down to 40°C and discharge.

Embodiment 3

[0023] Add 142.2 grams of polypropylene glycol with a molecular weight of 3000 to a four-necked reaction flask equipped with stirring and a thermometer, vacuum dehydrate at a temperature of 125°C for 1.5 hours, add 0.30 grams of dibutyltin dichloride and 17.8 grams of 4,4 -Diphenylmethane diisocyanate, stirring, slowly heating up, controlling the temperature at 60°C, reacting for 3.5 hours, until the content of isocyanate (NCO) is detected to be less than 1.8%, add 0.31 g of antioxidant tris(2,4- Di-tert-butylphenyl) phosphite and 17.0 grams of lauryl acrylate were used as diluents, fully stirred for 0.5 hours, and finally 1.68 grams of acrylate-β-hydroxyethyl ester and 1.65 grams of ethylene glycol monomethyl ether were added as end-capping agents. The reaction was continued for 3 hours at a temperature of 70° C., and the temperature was lowered to 40° C. to discharge.

[0024] The performance of the polyurethane acrylate of the present invention was tested by the following t...

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Abstract

The invention relates to a method for synthesizing low-hardness polyurethane acrylate, which comprises the following steps of: firstly, performing vacuum dehydration on polyether diol for 1 to 2 hours at the temperature of between 100 and 130 DEG C; secondly, adding a catalyst and diisocyanate, fully stirring at the temperature of between 50 and 70 DEG C and reacting for 3 to 4 hours, adding an antioxidant and a diluent when detecting that the isocyanate content is smaller than a fixed value, and fully stirring for 0.5 hour; and finally, adding a blocking agent, continuing to react for 2 to 3hours at the temperature of between 70 and 80 DEG C, cooling to 40 DEG C and discharging. The functionality of the low-hardness polyurethane acrylate synthesized by the method is smaller than 2, so double bond density is low, the flexibility of a curing film is high, the molecular weight of resin can be reasonably controlled, curing shrinkage is low, the water resistance, low-temperature resistance, impact resistance and the like of the curing film are obviously improved in the presence of a polyether structural unit, and the low-hardness polyurethane acrylate is suitable for preparing a high-flexibility photo-curing adhesive.

Description

technical field [0001] The invention relates to a method for synthesizing polyurethane acrylate, in particular to a method for synthesizing low-hardness polyurethane acrylate. [0002] All preparation methods have been changed to synthetic methods. Background technique [0003] With the continuous expansion of the application field of UV curing technology, the market has put forward various requirements for light-curing adhesives. The performance of the prepolymer as one of the main components determines whether the light-curing adhesive can meet certain basic requirements to a large extent. Due to its high synthesis flexibility and excellent comprehensive performance, polyurethane acrylate has been widely used in the fields of photocurable coatings, inks, and adhesives. Existing urethane acrylates are generally difunctional or multifunctional, and the molecular weight of the resin is relatively small, so the elasticity and flexibility of photocured film-forming materials ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/67C08G18/48C09J175/16
Inventor 崔亨利王建斌陈田安
Owner YANTAI DARBOND TECH