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Phenolic resin binder with less resin content

A technology of phenolic resin and resin content, which is applied in the direction of casting molding equipment, molds, cores, etc., can solve the problems of low strength, increased dosage, and increased core cost, and achieve strong bonding strength, high compressive strength, The effect of reduced dosage

Inactive Publication Date: 2019-02-19
合肥凯大新型材料科技有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Phenolic resin is one of the earliest industrialized synthetic resins with a history of nearly a hundred years. Phenolic resin is a high molecular polymer formed by condensation of phenols and aldehydes in the presence of acid or alkali catalysts. According to the catalyst Different, different types of structures are synthesized. Under acidic conditions, phenols and aldehydes will condense into linear straight-chain thermoplastic resins; under alkaline conditions, they will condense into thermosetting resins containing methylol branched chains. The raw materials are cheap, the synthesis process is simple, the equipment requirements are not high, and it has excellent properties such as heat resistance, friction resistance, flame retardancy, electrical insulation, and easy molding processing, so it is widely used; due to the good heat resistance of phenolic resin, It is used as a sand binder in casting. CO2 hardened alkaline phenolic resin is a new type of binder, which has the dual advantages of environmental protection and manufacturability, and is in line with the development trend of green and clean casting. However, due to the relatively high viscosity of the resin The maximum is more than 150mPa s, it is not easy to mix evenly with silica sand, and the use performance is not good, but the low viscosity of the resin will result in low strength, and it is easy to collapse the box when the mold is opened, which affects the production efficiency. The existing patent application number is 2012104836704. A kind of CO2 hardening alkaline phenolic resin and its preparation method limit the preparation composition, composition ratio and preparation method. The method of co-catalyzing alcohol and alkali in the polycondensation reaction stage is used to reduce the viscosity of the resin, thereby enhancing the performance of the molding sand. However, in the actual preparation process Among them, due to the low strength of the sand core at room temperature, the increase in the amount of resin added will lead to an increase in the cost of the core, and insufficient addition will affect the compressive strength of the phenolic resin binder. Therefore, it is necessary to further optimize the modification of the CO2 hardening basic resin

Method used

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  • Phenolic resin binder with less resin content

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preparation example Construction

[0020] The preparation method of the modifier is to heat the xylene solution with a mass concentration of 28-36% to 125-135°C in an argon atmosphere, and then add 2.6-3.2% polyacrylic acid equivalent to the weight of the xylene solution Butyl ester, 1.2-1.8% α-cyanoacrylate, 2.2-2.8% vinyl tertiary carbonate, stirred for 40-60 minutes, then cooled to 95-105°C, then added 1.5-2 % isooctyl acrylate, 0.8-1.2% dodecyl mercaptan, 0.2-0.7% furfural, stir for 10-12 hours, cool to room temperature after completion, add ethanol and let stand for 4-6 hours, filter after completion, Obtained by washing and drying;

[0021] The preparation method includes the following contents: mixing thermosetting resole phenolic resin, thermosetting b-stage phenolic resin, alkali aqueous solution with a mass concentration of 50%, and a modifier, stirring and mixing for 30-40 minutes at a temperature of 85-95°C , lower the temperature to 45°C, add potassium pyrophosphate, boric acid, alkaline regulator...

Embodiment 1

[0033] A phenolic resin binder with reduced resin content, comprising the following raw materials in parts by weight: 40 parts of thermosetting resole phenolic resin, 24 parts of thermosetting B-stage phenolic resin, 80 parts of alkali aqueous solution with a mass concentration of 50%, and 8 parts of modifier 2 parts of potassium pyrophosphate, 5 parts of boric acid, 4 parts of alkaline regulator, 8 parts of ammonium sulfate, 3.2 parts of lauryl glucoside, 3.5 parts of polycarbonate diol, 2.2 parts of organometallic carboxylic acid compound, wood 1.6 parts of sodium sulfonate, 5 parts of silane coupling agent;

[0034]The preparation method of the modifier is as follows: in an argon atmosphere, heat a xylene solution with a mass concentration of 32% to 130°C, and then add 2.9% polybutylacrylate, 1.5% α -Cyanoacrylate, 2.5% vinyl tertiary carbonate, stirred for 50 minutes, then cooled to 100°C, then added 1.8% isooctyl acrylate, 1% dodecyl mercaptan, 0.5 % furfural, stirred an...

Embodiment 2

[0038] A phenolic resin binder with reduced resin content, comprising the following raw materials in parts by weight: 35 parts of thermosetting resole phenolic resin, 20 parts of thermosetting B-stage phenolic resin, 75 parts of alkali aqueous solution with a mass concentration of 50%, and 10 parts of modifier 3 parts, potassium pyrophosphate 3 parts, boric acid 4 parts, alkaline regulator 5 parts, ammonium sulfate 10 parts, lauryl glucoside 3.6 parts, polycarbonate diol 3.3 parts, organometallic carboxylic acid compound 2.6 parts, wood 1.4 parts of sodium sulfonate, 6 parts of silane coupling agent;

[0039] The preparation method of the modifier is as follows: in an argon atmosphere, heat a xylene solution with a mass concentration of 28% to 125°C, and then add 3.2% polybutylacrylate, 1.2% α -Cyanoacrylate, 2.8% vinyl tertiary carbonate, stirred for 60 minutes, then cooled to 105°C, then added 2% isooctyl acrylate, 1.2% dodecyl mercaptan, 0.2 % furfural, stirred and reacted...

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Abstract

The invention belongs to the technical field of binders used in casting production molding and core making processes, and particularly relates to a phenolic resin binder with less resin content. The phenolic resin binder comprises the following raw materials of thermosetting resol, thermosetting resitol, aqueous alkali with the mass concentration of 50%, a modifier, potassium pyrophosphate, boricacid, an alkaline regulator, ammonium sulfate, lauryl glucoside, polycarbonate diol, an organometallic carboxylic acid compound, sodium lignosulfonate and a silane coupling agent. Compared with the prior art, the phenolic resin binder has the following advantages that different properties of the thermosetting resol and the thermosetting resitol are utilized to perform a reaction with the modifierand the aqueous alkali under a high temperature condition, so that the obtained phenolic resin binder has good binding strength; and compared with the prior art, the addition amount of phenolic resinis reduced, the good pressure resistance strength is ensured, and the phenolic resin binder can be used for casting and enhancing the service performance of molding sand.

Description

technical field [0001] The invention belongs to the technical field of binders used in casting production modeling and core-making processes, and in particular relates to a phenolic resin binder with reduced resin content. Background technique [0002] Phenolic resin is one of the earliest industrialized synthetic resins with a history of nearly a hundred years. Phenolic resin is a high molecular polymer formed by condensation of phenols and aldehydes in the presence of acid or alkali catalysts. According to the catalyst Different, different types of structures are synthesized. Under acidic conditions, phenols and aldehydes will condense into linear straight-chain thermoplastic resins; under alkaline conditions, they will condense into thermosetting resins containing methylol branched chains. The raw materials are cheap, the synthesis process is simple, the equipment requirements are not high, and it has excellent properties such as heat resistance, friction resistance, flam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/22
CPCB22C1/2246
Inventor 张海涛
Owner 合肥凯大新型材料科技有限公司
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