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Preparation method of resin for casting

A technology of casting resin and cardanol, which is applied in casting molding equipment, casting molds, manufacturing tools, etc., to achieve the effects of low water content, increased toughness and moisture resistance, and improved moisture resistance

Active Publication Date: 2014-02-05
共享新材料(山东)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] So far, there is no way to overcome the above drawbacks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment one: a kind of preparation method of resin for casting, this method comprises the steps:

[0024] a. Add 100 parts of furfural, 50 parts of cardanol, 20 parts of urea, and 0.1 part of sodium hydroxide into the reactor, control the reaction temperature at 85° C., keep the temperature for 1 hour, cool down to room temperature, and obtain the resin;

[0025] b. Add 100 parts of the above resin, 160 parts of furfuryl alcohol, and 0.5 parts of hydrochloric acid into the reactor, control the reaction temperature at 98°C, keep the temperature for 1 hour, then transfer to the vacuum distillation kettle, under the conditions of temperature 55°C and vacuum degree -0.06MPa Distill and dehydrate under reduced pressure for 1 hour, lower to room temperature, adjust pH to 7.0, then add 6 parts of silane and 10 parts of dioctyl phthalate, and stir evenly to obtain an environmentally friendly and moisture-resistant casting resin.

Embodiment 2

[0026] Embodiment two: a kind of preparation method of resin for casting, this method comprises the steps:

[0027] a. Add 100 parts of furfural, 65 parts of cardanol, 15 parts of urea, and 0.15 parts of barium hydroxide into the reactor, control the reaction temperature at 95° C., keep the temperature for 2 hours, cool to room temperature, and obtain the resin;

[0028] b. Add 100 parts of the above resin, 180 parts of furfuryl alcohol, and 0.6 parts of sulfuric acid into the reactor, control the reaction temperature at 108°C, and keep the temperature for 1.5 hours, then transfer it to a vacuum distillation kettle, at a temperature of 65°C and a vacuum of -0.065MPa Distill and dehydrate under reduced pressure for 1.5 hours, lower to room temperature, adjust the pH to 7.0, then add 8 parts of siloxane and 15 parts of dibutyl phthalate, and stir evenly to obtain an environmentally friendly and moisture-resistant casting resin.

Embodiment 3

[0029] Embodiment three: a kind of preparation method of resin for casting, this method comprises the steps:

[0030] a. Add 100 parts of furfural, 80 parts of cardanol, 10 parts of urea, and 0.5 part of zinc acetate into the reactor, control the reaction temperature at 115° C., keep the temperature for 2 hours, cool to room temperature, and obtain the resin;

[0031] b. Add 100 parts of resin, 230 parts of furfuryl alcohol, and 0.8 parts of formic acid into the reactor, control the reaction temperature at 98°C, keep it warm for 2 hours, transfer it to a vacuum distillation kettle, and put it under the conditions of temperature 70°C and vacuum degree -0.07MPa Distilled and dehydrated under reduced pressure for 1 hour, lowered to room temperature, adjusted pH to 7.5, then added 10 parts of ethyl silicate and 20 parts of dibutyl phthalate, and stirred evenly to obtain an environmentally friendly and moisture-resistant casting resin.

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PUM

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Abstract

The invention relates to a preparation method of resin and in particular relates to a preparation method of resin for casting. The preparation method of the resin for casting is characterized by comprising the following steps: adding furfuraldehyde, cardanol, urea and an alkali catalyst into a reactor, preserving heat, carrying out a reaction, and then cooling to room temperature, thus obtaining resin; adding the resin, furfuraldehyde and an acid catalyst into the reactor, controlling the reaction temperature at 70-100 DEG C, preserving heat and carrying out a reaction for 1-3 hours, transferring reaction products into a reduced pressure distillation kettle, carrying out reduced pressure distillation and dehydration for 1-2 hours under the conditions that the temperature is 50-80 DEG C and the vacuum degree ranges from minus 0.05MPa to minus 0.08MPa, cooling to room temperature, regulating pH value to be 7.0-7.5, then adding 6-10 parts by weight of silicon compound and 15-20 parts of dibasic ester, and uniformly stirring, thus obtaining the resin for casting. The preparation method of the resin for casting is unique and environment-friendly, and the moisture resistance is better than that of the traditional furan resin.

Description

technical field [0001] The invention relates to a method for preparing resin, in particular to a method for preparing resin for casting. Background technique [0002] In the late 1950s, furan resin began to appear and was used in the foundry industry, forming the furan resin no-setting resin sand process. Furan resin generally uses furfuryl alcohol as the main component, and through single or compound modification of urea-formaldehyde, ketone-formaldehyde, phenol-formaldehyde and other components, the casting resin with relatively excellent performance is finally synthesized. [0003] Although furan resin has many excellent properties, the formaldehyde poisoning and smoke pollution produced in the casting process have always plagued the foundry industry. Formaldehyde exists in two forms in furan resin, one is free formaldehyde, even if it is controlled in a very low range, due to the large amount of resin sand, the total amount of formaldehyde released during the molding pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/34C08G14/12C08G14/08B22C1/22
Inventor 马文何龙杨洋韩文
Owner 共享新材料(山东)有限公司
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