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Preparation method for modified foundry furan resin

A furan resin and modification technology, which is applied in casting molding equipment, casting molds, manufacturing tools, etc., can solve problems affecting the health of casting personnel, and achieve the effects of easy control and industrialization, low price, and a wide range of sugar sources

Active Publication Date: 2013-05-22
SUZHOU XINGYE MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, this preparation method does not deal with the unreacted phenol after the reaction, and the free phenol in the casting resin will emit during the casting process, which will affect the health of casting personnel
Based on the above reasons, the wood adhesive is not suitable for direct use as casting resin

Method used

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  • Preparation method for modified foundry furan resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 100g sucrose to 40g water until dissolved, then add 5g concentrated hydrochloric acid and 0.1g phenol, stir and heat up to 70°C, react for 10h, cool down to 30°C, adjust the pH value to 8.5 with 30% sodium hydroxide, add 0.1g The formaldehyde was reacted at 60°C for 3 hours, and then 40 g was dehydrated to obtain a brown-red viscous liquid.

[0039] According to the corresponding steps of the comparative example, under the conditions of steps (1) to (3) unchanged, in step (4), take 5 g of the above-mentioned brown-red viscous liquid to replace 5 g of furfuryl alcohol in step (4) of the comparative example (the total amount of raw materials 5% by weight), the raw materials actually participating in the reaction are 35g furfuryl alcohol, 5g brownish-red viscous liquid and 0.85g silane coupling agent, and other conditions remain unchanged to obtain a modified furan resin for casting, and its properties are shown in Table 1.

Embodiment 2

[0041] Add 100g sucrose to 75g water until dissolved, then add 15g concentrated phosphoric acid and 13.75g phenol, stir and heat up to 90°C, react for 2h, cool down to 60°C, adjust the pH value to 8.5 with 30% sodium hydroxide, add 3g of Formaldehyde was reacted at 90°C for 1 hour, and then 85 g was dehydrated to obtain a brown-black viscous liquid.

[0042] According to the corresponding steps of the comparative example, under the conditions of steps (1) to (3) unchanged, in step (4), take 10 g of the above-mentioned brown-black viscous liquid to replace 10 g of furfuryl alcohol in the step (4) of the comparative example (the total amount of raw materials 10% of the weight), the actual raw materials participating in the reaction are 30g furfuryl alcohol, 10g brown-black viscous liquid and 0.85g silane coupling agent, and other conditions remain unchanged to obtain a modified furan resin for casting, and its properties are shown in Table 1.

Embodiment 3

[0044] Add 100g sucrose to 80g water until dissolved, then add 20g concentrated nitric acid, 10g phenol and 5g hydroquinone, stir and heat up to 90°C, react for 2h, cool down to 60°C, adjust the pH value to 9.0, add 5g of formaldehyde, heat up to 90°C for 2 hours, then dehydrate 85g to obtain a brown-black viscous liquid.

[0045] According to the corresponding steps of the comparative example, under the condition that the steps (1) to (3) remain unchanged, in the step (4), take 20 g of the above-mentioned brown-black viscous liquid to replace 20 g of furfuryl alcohol in the step (4) of the comparative example (the total amount of raw materials 20% by weight), the actual raw materials that participated in the reaction were 20g furfuryl alcohol, 20g brown-black viscous liquid and 0.85g silane coupling agent, and other conditions were unchanged to obtain a modified furan resin for casting, and its properties are shown in Table 1.

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Abstract

The invention discloses a preparation method for modified foundry furan resin, which is characterized by comprising the following steps of: (1) dissolving 100 parts by weight of saccharides in 40-200 parts by weight of water, and then adding 0.1-50 parts by weight of phenols and 5-50 parts by weight of acid, reacting for 0.5-10 hours in a temperature condition of 70-100 DEG C, cooling to 30-90 DEG C, adding pH value to 7.5-10, adding 0.1-20 parts by weight of formaldehyde, heating to 60-100 DEG C and reacting for 0.5-6 hours, and then removing 5-280 parts by weight of water to obtain a viscous liquid; and (2) taking the viscous liquid obtained in the step (1) as a part of furfuryl alcohol substitutes, and preparing foundry furan resin according to the conventional process for foundry furan resin; wherein the dosage of the viscous liquid is equivalent to the weight of the substituted furfuryl alcohol, and is 1-20% of the total weight of the synthetic materials of foundry furan resin.

Description

technical field [0001] The invention belongs to the technical field of furan resin synthesis technology for casting, and in particular relates to a preparation method of modified furan resin for casting. Background technique [0002] As early as the 1960s, furan resin began to be used in the foundry industry, and has achieved rapid development. It has become the largest amount of foundry resin in my country and the world. As we all know, the existing furan resin for foundry is basically a resin synthesized with furfuryl alcohol as the main raw material. The higher the content of furfuryl alcohol in the furan resin for foundry, the higher its bonding strength, so the cost of the resin is greatly affected by furfuryl alcohol. [0003] The steps of preparing furfuryl alcohol are mainly to hydrolyze renewable agricultural by-products such as corncobs and crop stalks under the action of a catalyst to convert them into pentoses; dehydration and cyclization of pentoses to generate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G16/04B22C1/22
Inventor 王进兴黄萍珍顾嫒娟陆玉峰朱文英
Owner SUZHOU XINGYE MATERIALS TECH
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