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Bisphenol A formaldehyde phenolic resin and synthetic method thereof

A technology of phenolic resin and synthesis method, applied in the direction of aldehyde/ketone condensation polymer adhesive, adhesive type, adhesive, etc., can solve the problems of difficult separation and purification, high content of free formaldehyde, small molecular weight, etc.

Inactive Publication Date: 2018-12-07
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the bisphenol A formaldehyde phenolic resin synthesized on the market has a small molecular weight (2000) and a large content of free formaldehyde. There are great difficulties in product separation and purification, and it is not easy to bond to substrates with low surface polarity, such as PP and PE materials. base material

Method used

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  • Bisphenol A formaldehyde phenolic resin and synthetic method thereof
  • Bisphenol A formaldehyde phenolic resin and synthetic method thereof
  • Bisphenol A formaldehyde phenolic resin and synthetic method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Step 1. Add 11.4g of bisphenol A and 25mL of n-butanol into a 50ml three-neck round bottom flask equipped with mechanical stirring and reflux condensing device, stir and heat up to 60°C until the bisphenol A is completely dissolved and the reaction system is clear and transparent .

[0043] Step 2. Reflux to room temperature with water cooling, then add 4.5 g of 37% formaldehyde aqueous solution and 0.13 g of p-toluenesulfonic acid at one time to form a mixed solution; stir the mixed solution while heating to 95° C. at a stirring rate of 450 r / min; Reacted at this temperature for 7h to generate a purple liquid.

[0044] Step 3, distill off n-butanol and a small amount of water under normal pressure, then remove the remaining water under reduced pressure until there is no water drop back, and the product becomes a purple-red viscous liquid.

[0045] Step 4, wash with boiling water 3 times to remove unreacted bisphenol A, finally dehydrate under reduced pressure, dry in ...

Embodiment 2

[0047] Step 1. Add 10g of bisphenol A and 20mL of n-butanol into a 50ml three-neck round bottom flask equipped with mechanical stirring and reflux condensing device, stir and raise the temperature to 70°C until the bisphenol A is completely dissolved and the reaction system is clear and transparent.

[0048] Step 2. Cool and reflux with water to room temperature, then add 5 g of 37% formaldehyde aqueous solution and 0.4 g of p-toluenesulfonic acid at one time to form a mixed solution; stir the mixed solution while heating to 80°C with a stirring rate of 450r / min; Reaction at this temperature for 5h produces a purple liquid.

[0049] Step 3, distill off n-butanol and a small amount of water under normal pressure, then remove the remaining water under reduced pressure until there is no water drop back, and the product becomes a purple-red viscous liquid.

[0050] Step 4, wash with boiling water 5 times to remove unreacted bisphenol A, finally dehydrate under reduced pressure, dr...

Embodiment 3

[0052] Step 1. Add 30g of bisphenol A and 30mL of n-butanol into a 50ml three-necked round bottom flask equipped with a mechanical stirring and reflux condensing device, stir and heat up to 80°C until the bisphenol A is completely dissolved and the reaction system is clear and transparent.

[0053] Step 2. Reflux with water to room temperature, then add 6.7g of 37% formaldehyde solution and 0.3g of p-toluenesulfonic acid at one time to form a mixed solution; stir the mixed solution while heating to 85°C with a stirring rate of 450r / min; Reaction at this temperature for 8h, resulting in a purple liquid.

[0054] Step 3, distill off n-butanol and a small amount of water under normal pressure, then remove the remaining water under reduced pressure until there is no water drop back, and the product becomes a purple-red viscous liquid.

[0055] Step 4, wash with boiling water 4 times to remove unreacted bisphenol A, finally dehydrate under reduced pressure, dry in a vacuum oven at ...

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Abstract

The invention discloses bisphenol A formaldehyde phenolic resin and a synthetic method thereof. The molecular weight of the bisphenol A formaldehyde phenolic resin is 2000-3000, and the molecular weight is higher than that of existing bisphenol A formaldehyde phenolic resin. The bisphenol A formaldehyde phenolic resin is prepared from bisphenol A and formaldehyde free radicals which are polymerized by means of the method. The bisphenol A formaldehyde phenolic resin has excellent glueyness. On the one hand, original hydroxyl and benzene rings and active sites of bisphenol A are retained and themolecular weight of bisphenol A is also improved; on the other hand, as the polymer structure contains a great many of active sites, in the gluing process, chemical reactions happen or a curing agentis added to generate an undissolved polymer of a three-dimensional netty structure. Meanwhile, a condensation reaction is carried out on bisphenol A and formaldehyde to form methylene bridged bisphenol A. Therefore, the related molecular weight of the polymer is increased greatly, the polymer is then reacted with a bonding substrate, and can react through active groups, so that the bisphenol A formaldehyde phenolic resin is adhered quickly to achieve the adhering purpose.

Description

【Technical field】 [0001] The invention belongs to the technical field of adhesives, and in particular relates to a bisphenol A formaldehyde phenolic resin and a synthesis method thereof. 【Background technique】 [0002] Because phenolic resin has excellent corrosion resistance, mechanical properties, electrical insulation, molding processability, flame retardancy, dimensional stability and low toxic fog, and its low price, simple production process and equipment, it is widely used in aircraft and space It plays an important role in industrial fields, military equipment, transportation, mining, construction and microelectronics, and is an indispensable polymer material in the industrial field. Phenolic resin has the advantages of high bonding strength, water resistance, heat resistance, friction resistance and good chemical stability. However, phenolic resin adhesives also have shortcomings such as dark color, hard and brittle cured adhesive layer, easy cracking, high cost, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/20C09J161/12
CPCC08G8/20C09J161/12
Inventor 郭睿李秀环霍文生冯文佩刘雪艳高弯弯
Owner SHAANXI UNIV OF SCI & TECH
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