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Environment-friendly high-strength phenolic resin special for precoated sand

A technology of phenolic resin and coated sand, which is used in casting molding equipment, molds, cores, etc., can solve the problems of slow curing speed, low heat resistance, poor strength, etc., to speed up curing speed and increase shift output. Effect

Inactive Publication Date: 2020-06-19
上海坦默新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although after years of continuous improvement, compared with phenolic resin products in Europe, America, Japan and South Korea, there are still disadvantages such as slightly weaker strength, low heat resistance, slow curing speed, and unpleasant smell.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] The present invention also provides a preparation method of special phenolic resin for environmentally friendly high-strength coated sand: specifically, it includes the following steps:

[0035] (1) Feeding stage: phenols and formaldehyde are metered into the reactor, catalysts and additives are fed in at the same time according to the proportion, pay attention to accurate feeding, and pay attention to heat preservation of pipelines;

[0036] (2) Polycondensation reaction stage: volatile substance vapor (moisture, formaldehyde, etc.) enters the condenser through the pipeline, the temperature is controlled in the range of 80°C-90°C, and the polycondensation reaction speed is controlled by temperature; the pH value is controlled at ≤3.5;

[0037] (3) Dehydration process stage: after the volatile steam is condensed, it will no longer flow back, but will be discharged to the condensation receiving tank, the time requirement is 8-12h, and the temperature requirement is 100-15...

Embodiment 1

[0046] Embodiment 1 provides a preparation method of a special phenolic resin for environmentally friendly high-strength coated sand, which is obtained by reacting phenols and formaldehydes in the presence of catalysts and additives.

[0047] The phenols are phenol; the formaldehydes are formaldehyde; the mol ratio of the phenol and formaldehyde is 1:1.08;

[0048] The catalyst is urotropine and oxalic acid; based on 1 mole of phenols, the content of urotropine is 6%, and the content of oxalic acid is 1%;

[0049] The additives are KH550 and polyimide; KH550 0.5‰ and polyimide 7‰ based on 1 mole of phenols.

[0050] Specifically, the following steps are included:

[0051] (1) Feeding stage: phenols and formaldehyde are metered into the reactor, catalysts and additives are fed in at the same time according to the proportion, pay attention to accurate feeding, and pay attention to heat preservation of pipelines;

[0052] (2) Polycondensation reaction stage: volatile substance st...

Embodiment 2

[0057] Example 2 provides a preparation method of a special phenolic resin for environmentally friendly high-strength coated sand, which is obtained by reacting phenols and formaldehydes in the presence of catalysts and additives.

[0058] The phenols are phenol; the formaldehydes are formaldehyde; the mol ratio of the phenol and formaldehyde is 1:1.1;

[0059] The catalyst is urotropine and oxalic acid; based on 1 mole of phenols, the content of urotropine is 10%, and the content of oxalic acid is 3%;

[0060] The additives are KH550 and polyimide; based on 1 mole of phenols, KH550 1‰, polyimide 4‰.

[0061] Specifically, the steps are the same as in Example 1.

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PUM

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Abstract

The invention belongs to the technical field of phenolic resin preparation, and particularly relates to environment-friendly high-strength phenolic resin special for precoated sand. The invention discloses a preparation method of the environment-friendly high-strength phenolic resin special for precoated sand. The environment-friendly high-strength phenolic resin is obtained by reacting phenols with formaldehyde in the presence of a catalyst and an additive. The brand-new precoated sand composite resin is prepared by adding a special raw material polyimide to replace original aniline and controlling the temperature and dehydration during synthesis in a reaction kettle, the resin is already used in batches in a precoated sand manufacturing factory, and the original strength and heat resistance defects puzzling people for many years are overcome. Particularly, the curing speed of the precoated sand is increased, the outputs of a sand core and a shell mold are increased, and pungent chokes originally generated by heating the precoated sand in a workshop are replaced by aromatic smells.

Description

technical field [0001] The invention belongs to the technical field of phenolic resin preparation, and more specifically relates to a special phenolic resin for environmentally friendly high-strength coated sand. Background technique [0002] At present, the main raw material for the production of coated sand is phenolic resin, which is added as a binder in an appropriate amount according to the requirements of use, mixed with a certain proportion of aggregate, curing agent, lubricant, and additives, stirred evenly, and then packaged and used after cooling. The formula and processing technology of the phenolic resin for coated sand currently produced in China is still imported from abroad in the 1970s, that is, the chemical reaction of phenol and formaldehyde in a reactor, and then the addition of aniline, coupling agent, and additives. become. Although after many years of continuous improvement, compared with phenolic resin products in Europe, America, Japan and South Kore...

Claims

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Application Information

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IPC IPC(8): C08G8/10C08L61/10C08L79/08C08K5/544B22C1/22
CPCB22C1/2253C08G8/10C08L61/06C08L79/08C08K5/544
Inventor 王海江
Owner 上海坦默新材料科技有限公司
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