CN104804162A

CN104804162A - Hot core box resin for casting and preparation method thereof

Info

Publication number: CN104804162A
Application number: CN201510238720.6A
Authority: CN
Inventors: 吴景泉; 殷涛; 艾家贵
Original assignee: Appearance Of City River Wuhu Electromechanical Technology Co Ltd
Current assignee: Appearance Of City River Wuhu Electromechanical Technology Co Ltd
Priority date: 2015-05-12
Filing date: 2015-05-12
Publication date: 2015-07-29

Abstract

The invention discloses a hot core box resin for casting and a preparation method thereof. The hot core box resin for casting comprises the following raw materials by mass percentage: 91-93 percent of furfuryl alcohol, 0.1-0.2 percent of solid formaldehyde, 2.0-3.0 percent of urea, 4.3-5.2 percent of monohydric alcohol and 0.6 percent of coupling agent. During production, firstly the furfuryl alcohol and the monohydric alcohol are added into a reaction kettle, and the PH value is controlled to be 10.0-11.0; then the uniformly mixed urea and solid formaldehyde are added, steam is added for increasing temperature, steam inlet speed is kept to control the temperature to be increased to approximate 87 DEC G within one hour and the heat is preserved for two hours; then the temperature is decreased to approximate 60 DEG C, the PH value is regulated to 5.5-6.5 by using acidic catalyst, the steam is added again to increase the temperature to approximate 90 DEG C, the heat is preserved for one hour, then the temperature is naturally decreased to be below 55 DEG C and the coupling is added and uniformly mixed to obtain finished products. Since the solid formaldehyde is used for replacing liquid formaldehyde, the total amount of the solid formaldehyde is reduced by more than 50 percent and the amount of free formaldehyde is reduced; the hot core box resin has the advantages of low viscosity, easiness in sand mixing and good mold sand mobility; the solidifying speed is fast, the strength is high and the casting quality is favorably improved.

Description

A kind of hot core box for casting resin and preparation method thereof

Technical field

The invention belongs to a kind of hot core box resin and preparation method thereof, particularly relate to a kind of hot core box for casting resin and preparation method thereof.

Background technology

The general smell of current hot core box resin is comparatively large, and mainly owing to containing a large amount of free formaldehydes in resin, contaminate environment, infringement workman is healthy, and in the process of use, hot core box resin gas forming amount is large, and raising rate is fast, easily produces casting flaw; Also there is core resistance to water soak poor, intensity is unstable.

Summary of the invention

The object of this invention is to provide a kind of use procedure Free-formaldehyde content low, hot core box for casting resin that intensity is high, viscosity is low and preparation method thereof.Object of the present invention is achieved through the following technical solutions: this hot core box for casting resin, its raw material and mass percentage are: furfuryl alcohol 91-93%, solid formaldehyde 0.1-0.2%, urea 2.0-3.0%, monohydroxy-alcohol 4.3-5.2% and coupling agent fixed amount are 0.6%, first furfuryl alcohol, monohydroxy-alcohol are added in reactor in production process, pH value is controlled at 10.0-11.0; Then add the urea and solid formaldehyde that mix, add steam and heat up, keep intake velocity, control in 1 hour, be warming up to about 87 DEG C and carry out insulation 2 hours; Be cooled to about 60 DEG C again, regulate pH value to 5.5-6.5 with an acidic catalyst, add steam again and be warming up to about 90 DEG C, be incubated Temperature fall less than 55 DEG C after 1 hour and add after coupling agent stirs and obtain finished product.

The present invention adopts solid formaldehyde to replace liquid formaldehyde, and the total amount of solid formaldehyde reduces more than 50%, reduces formaldehyde free amount; And there is the low easy mulling of viscosity, sand fluidity is good; Quick solidifying, intensity are high, favourable raising casting quality.

Embodiment

The present invention is described in further detail in conjunction with the embodiments.

This its raw material of hot core box for casting resin and mass percentage are: furfuryl alcohol 91-93%, solid formaldehyde 0.1-0.2%, urea 2.0-3.0%, monohydroxy-alcohol 4.3-5.2% and coupling agent fixed amount are 0.6%.

First 93kg furfuryl alcohol, 4.3kg monohydroxy-alcohol are added in reactor in production process, pH value is controlled at 10.0-11.0; Then add the 2kg urea and 0.2kg solid formaldehyde that mix, add steam and heat up, keep intake velocity, control in 1 hour, be warming up to about 87 DEG C and carry out insulation 2 hours; Be cooled to about 60 DEG C again, regulate pH value to 5.5-6.5 with an acidic catalyst, add steam again and be warming up to about 90 DEG C, be incubated Temperature fall less than 55 DEG C after 1 hour and add after 0.6kg coupling agent stirs and obtain finished product.

Claims

1. a hot core box for casting resin, is characterized in that;

Its raw material and mass percentage are: furfuryl alcohol 91-93%, solid formaldehyde 0.1-0.2%, urea 2.0-3.0%, monohydroxy-alcohol 4.3-5.2% and coupling agent fixed amount are 0.6%.

2. the preparation method of hot core box for casting resin according to claim 1, is characterized in that:

First furfuryl alcohol, monohydroxy-alcohol are added in reactor, pH value is controlled at 10.0-11.0; Then add the urea and solid formaldehyde that mix, add steam and heat up, keep intake velocity, control in 1 hour, be warming up to about 87 DEG C and carry out insulation 2 hours; Be cooled to about 60 DEG C again, regulate pH value to 5.5-6.5 with an acidic catalyst, add steam again and be warming up to about 90 DEG C, be incubated Temperature fall less than 55 DEG C after 1 hour and add after coupling agent stirs and obtain finished product.