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Preparation method of novel modified furan resin for casting

A furan resin and modification technology, applied in casting molding equipment, casting molds, manufacturing tools and other directions, can solve problems such as the unsuitability of wood board adhesives, and achieve the effects of low price, improved strength, and simple and feasible process

Active Publication Date: 2014-09-24
SUZHOU XINGYE MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the comprehensive performance requirements of the casting process mentioned above, the wood adhesive is not suitable for direct use as casting resin

Method used

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  • Preparation method of novel modified furan resin for casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Add 30g of water, 100g of sucrose and 0.1g of urea into the reaction vessel, stir at 10°C until dissolved, then add 5g of concentrated sulfuric acid, stir and raise the temperature to 60°C, react for 20h, cool down to 30°C; oxidize with 30% hydrogen Adjust the pH value to 7.5 with sodium, add 0.1 g of formaldehyde, raise the temperature at 60°C for 6 hours, and then dehydrate 5 g to obtain a brown-red viscous liquid.

[0036] According to the corresponding steps of the comparative example, under the constant conditions of steps (1) to (3), get the above-mentioned brownish red viscous liquid 5g in the step (4) to replace the 5g furfuryl alcohol in the step (4) of the comparative example (the total amount of raw materials 5% of weight), the raw materials that actually participate in the reaction are 35g furfuryl alcohol, 5g brownish-red viscous liquid and 0.85g silane coupling agent, and other conditions are constant to obtain furan resin for modified casting, and its perf...

Embodiment 2

[0038] Add 60g of water, 100g of glucose and 5g of urea into the reaction vessel, stir at 30°C until dissolved, then add 10g of concentrated nitric acid, stir and raise the temperature to 80°C, react for 4 hours, and cool down to 40°C; use 30% sodium hydroxide Adjust the pH value to 8.5, add 6g of formaldehyde, heat up to 70°C for 4 hours, and then dehydrate 80g to obtain a brown-red viscous liquid.

[0039] According to the corresponding steps of the comparative example, under the constant condition of steps (1)~(3), get the above-mentioned brownish-red viscous liquid 5g in the step (4) to replace the 10g furfuryl alcohol in the comparative example step (4) (the total amount of raw materials 10% of weight), the raw materials that actually participate in the reaction are 30g furfuryl alcohol, 10g brownish-red viscous liquid and 0.85g silane coupling agent, and other conditions are constant to obtain furan resin for modified casting, and its performance is shown in Table 1.

Embodiment 3

[0041] Add 76g of water, 100g of sucrose and 7.5g of urea into the reaction vessel, stir at 40°C until dissolved, then add 25g of concentrated hydrochloric acid, stir and raise the temperature to 84°C, react for 2 hours, and cool down to 50°C; adjust with 20% ammonia water When the pH value reached 8.5, 8g of formaldehyde was added, the temperature was raised to 95°C for 1 hour, and then 98g was dehydrated to obtain a brown-red viscous liquid.

[0042] According to the corresponding steps of the comparative example, under the constant conditions of steps (1) to (3), get the above-mentioned brownish-red viscous liquid 20g in step (4) to replace 20g furfuryl alcohol in the step (4) of the comparative example (the total amount of raw materials 20% of weight), the raw materials that actually participate in the reaction are 20g furfuryl alcohol, 20g brownish red viscous liquid and 0.85g silane coupling agent, and other conditions are constant to obtain furan resin for modified casti...

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Abstract

The invention discloses a preparation method of novel modified furan resin for casting. The method is characterized by comprising the following steps of: (1) dissolving 100 parts by weight of saccharides and 0.1-40 parts by weight of urea into 30-200 parts by weight of water; adding 5-60 parts by weight of acid into a mixture to react for 0.5-10 hours at the temperature of 60-105 DEG C; cooling to 30-90 DEG C; regulating a pH value to 7.5-10 and adding 0.1-40 parts by weight of formaldehyde; raising the temperature to 60-100 DEG C to react for 0.5-6 hours; and removing 3-300 parts by weight of water to obtain viscous liquid; and (2) using the viscous liquid obtained in the step (1) as a partial furfuryl alcohol substitute and preparing the novel modified furan resin for casting according to the conventional process of furan resin for casting, wherein the using amount of the viscous liquid is equivalent to the weight of furfuryl alcohol to be substituted and accounts for 1-20 percent of the total weight of a furan resin synthetic raw material for casting. The method is simple, feasible and environmentally-friendly, and a reticulate structure of the resin is formed during curing, so that the intensity of furan resin sand for casting can be improved.

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 a novel modified furan resin for casting. Background technique [0002] The foundry binder system is composed of resin, curing agent and catalyst. A good foundry binder system must have good chemical stability and low viscosity; the resin and raw sand have a longer working life. After curing, it has good demoulding performance; sufficient strength at room temperature and high temperature; and has good collapsibility and easy regeneration of molding sand. Therefore, the choice of casting resin is very important. [0003] Furan resin refers to a resin synthesized with furfuryl alcohol having a furan ring as the main raw material. In the 1960s, furan resin began to be used in the foundry industry. It has developed rapidly due to its excellent properties such as fast hardening at room temperature, good diffusi...

Claims

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Application Information

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Patent Type & Authority Patents(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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