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Bisphenol A paraformaldehyde phenolic resin and preparation method thereof

A technology of paraformaldehyde and phenolic resin, which is applied in the field of phenolic resin, can solve the problems of difficult processing, harmful substances endangering the environment, etc., achieve the effect of high molecular weight and solve the problem of environmental pollution

Inactive Publication Date: 2021-03-30
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Harmful substances in wastewater seriously endanger the environment and are difficult to treat

Method used

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  • Bisphenol A paraformaldehyde phenolic resin and preparation method thereof
  • Bisphenol A paraformaldehyde phenolic resin and preparation method thereof
  • Bisphenol A paraformaldehyde phenolic resin and preparation method thereof

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preparation example Construction

[0033] The preparation method of the bisphenol A paraformaldehyde phenolic resin is obtained through the addition and condensation reaction of bisphenol A and paraformaldehyde, wherein n-butanol is used as a solvent, p-toluenesulfonic acid is used as a catalyst, and the paraformaldehyde contains no water It can avoid the problem of environmental pollution caused by a large amount of industrial wastewater in the production process of phenolic resin, and can synthesize products with high molecular weight.

[0034] Wherein the polymerization process is as follows,

[0035]

[0036] Specifically include the following steps:

[0037] Step 1: Add 11.4g (ie 0.05mol) of BPA and 20-40mL of n-butanol to a 250mL four-neck round bottom flask equipped with a mechanical stirring and reflux device, stir and heat up to 50-70°C.

[0038] Step 2: When the BPA dissolved solution is clear, add 1-4g of paraformaldehyde, 0-3g of distilled water, 0.1-0.4g of p-toluenesulfonic acid in sequence, a...

Embodiment 1

[0043] The preparation method of bisphenol A paraformaldehyde novolac resin of the present invention specifically comprises the following steps,

[0044] Step 1: Add 11.4 g of BPA and 25 mL of n-butanol simultaneously to a 250 mL four-necked round bottom flask equipped with a mechanical stirring and reflux device, stir and raise the temperature to 65°C.

[0045] Step 2: When the BPA dissolved solution is clear, add 1.5 g of paraformaldehyde, 1.5 g of distilled water and 0.25 g of p-toluenesulfonic acid in sequence, and perform addition reaction for 10 minutes.

[0046] Step 3: Heating to 90° C., polycondensation reaction for 6 hours, and obtaining the crude product of bisphenol a paraformaldehyde novolac resin.

[0047] Step 4: Distill the reacted crude product under reduced pressure for 0.5 h (temperature 80° C., rotation speed 60 r / min) to remove n-butanol, water and unreacted paraformaldehyde.

[0048] Step 5: Use a dialysis bag with a molecular weight of 1000 to seal the ...

Embodiment 2

[0054] Step 1: Add 11.4 g of BPA and 20 mL of n-butanol simultaneously to a 250 mL four-necked round bottom flask equipped with a mechanical stirring and reflux device, stir and heat up to 50°C.

[0055] Step 2: When the BPA dissolved solution is clear, add 1 g of paraformaldehyde, 1 g of distilled water and 0.1 g of p-toluenesulfonic acid in sequence, and perform addition reaction for 10 minutes.

[0056] Step 3: Heating to 80° C., polycondensation reaction for 5 hours, to obtain the crude product of bisphenol a paraformaldehyde novolac resin.

[0057] Step 4: The reacted crude product was distilled under reduced pressure for 0.5h (temperature 60°C, rotation speed 60r / min) to remove n-butanol, water and unreacted paraformaldehyde.

[0058] Step 5: Use a dialysis bag with a molecular weight of 1000 to seal the obtained product, place it in 400ml of acetone, and use a magnetic stirrer for dialysis for 8 hours; Carry out drying in the case, obtain the bisphenol A paraformaldehy...

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Abstract

The invention provides bisphenol A paraformaldehyde phenolic resin and a preparation method thereof, n-butyl alcohol is used as a solvent, p-toluenesulfonic acid is used as a catalyst, and bisphenol Aand paraformaldehyde are subjected to addition condensation reaction to obtain bisphenol A paraformaldehyde phenolic resin. The bisphenol A paraformaldehyde phenolic resin is produced by utilizing the characteristic that paraformaldehyde does not contain water, taking bisphenol A as a raw material, taking n-butyl alcohol as a solvent and taking p-toluenesulfonic acid as a catalyst and carrying out addition condensation reaction, the operation is simple, the environment is protected, the production cost is low, the synthetic route is easy to produce, the problem of environmental pollution caused by a large amount of industrial wastewater in the production process of phenolic resin is solved, and the synthesized product has high molecular weight.

Description

technical field [0001] The invention belongs to the technical field of phenolic resins, in particular to a bisphenol A paraformaldehyde phenolic resin and a preparation method thereof. Background technique [0002] At present, in the production process of phenolic resin, phenol and formaldehyde aqueous solution with a mass fraction of about 37% are used as reaction monomers, but because the formaldehyde aqueous solution with a mass fraction of about 37% contains a large amount of water, and at the same time, it is also used in the polycondensation reaction of phenolic resin. A certain amount of water will be produced. [0003] In order to promote the polycondensation reaction in the production process of phenolic resin, the water must be removed, so that a large amount of industrial wastewater will inevitably be generated in the production of phenolic resin. Harmful substances in wastewater seriously endanger the environment and are difficult to treat. [0004] Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/20
CPCC08G8/20
Inventor 郭睿李平安赵云飞
Owner SHAANXI UNIV OF SCI & TECH
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