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Hot box resin binder for thin-walled non-ferrous metal castings and preparation method thereof

A resin binder, non-ferrous metal technology, applied in the direction of adhesives, adhesive types, aldehyde/ketone condensation polymer adhesives, etc., can solve problems affecting product quality, high production cost and use cost, sand core collapse Poor quality and other problems, to achieve the effects of excellent product quality, comprehensive performance, reduced consumption costs, and improved thermal tensile strength

Active Publication Date: 2016-08-24
广东省铸力铸材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the sand core making process of such castings in China uses urea-formaldehyde resin sand and coated sand, which have the following quality defects: (1) The high content of free formaldehyde and free phenol in the resin will pollute the environment
(2) The thermal tensile strength is low, the core box of the sand core is easily damaged, the constant tensile strength is low, and the sand core has poor moisture resistance and is not suitable for storage
(3) The prepared sand core collapses poorly, and it is difficult to remove the residual sand in the pipe
(4) Urea-formaldehyde resin has a short storage period and is easy to delaminate, which affects the quality of the product
(5) High production cost and use cost

Method used

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  • Hot box resin binder for thin-walled non-ferrous metal castings and preparation method thereof
  • Hot box resin binder for thin-walled non-ferrous metal castings and preparation method thereof
  • Hot box resin binder for thin-walled non-ferrous metal castings and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In a device equipped with a three-neck flask, agitator and coil condenser, put 630g of formaldehyde (formaldehyde content 37%), add 80g of furfuryl alcohol, 190g of urea, 20g of sucrose, 20g of xylitol, and add 2.5g of catalyst FA to control the pH value. In the range of 8.5 to 9.0, at a material temperature of 80 to 85°C, add reaction for 90 minutes;

[0019] After the reaction time is up, add 50g of melamine, and add reaction for 30 minutes at a material temperature of 80-85°C;

[0020] After the reaction time is up, add 150g of methanol and 8g of catalyst FB, control the pH value in the range of 5.0-5.5, the temperature range of the material in the range of 95-98°C, and the etherification reaction takes 90 minutes.

[0021] After the reaction time is up, reduce the temperature of the material to below 75°C, add 1.7g of catalyst FA, control the pH value within the range of 7.0-7.5, add 40g of urea, and wait for the stirring and dissolution to complete, then vacuum deh...

Embodiment 2

[0029] In a 2000L enamel reaction kettle, put 630kg of formaldehyde (formaldehyde content 37%), add 90kg of furfuryl alcohol, 210kg of urea, 25g of sucrose or 30kg of xylitol, add 2.5kg of catalyst FA, and control the pH value within the range of 8.5-9.0. The temperature is 80-85°C, and the addition reaction takes 90 minutes.

[0030] After the reaction time is up, add 65kg of melamine, and add reaction for 30 minutes at a material temperature of 80-85°C. After the reaction time is up, add 165kg of methanol and 10kg of catalyst FB, control the pH value in the range of 5.0-5.5, and carry out the etherification reaction for 90 minutes at the material temperature of 95-98°C.

[0031] After the reaction time is up, reduce the temperature of the material to below 75°C, add 2.5g of catalyst FA, control the pH value within the range of 7.0-7.5, add 50kg of urea, and after stirring and dissolving, vacuum dehydration, the dehydration amount is 310-320kg.

[0032] After the dehydration...

Embodiment 3

[0039] In a 2000L enamel reaction kettle, put 690kg of formaldehyde (formaldehyde content 37%), add 87kg of furfuryl alcohol, 210kg of urea, 30Kg of sucrose, 20kg of xylitol, add 2.5kg of catalyst FA, and control the pH value within the range of 8.5-9.0. The temperature is 80-85°C, and the addition reaction takes 90 minutes.

[0040] After the reaction time is up, add 65kg of melamine, and add reaction for 30 minutes at a material temperature of 80-85°C.

[0041] After the reaction time is up, add 165kg of methanol and 10kg of catalyst FB, control the pH value in the range of 5.0-5.5, and carry out the etherification reaction for 90 minutes at the material temperature of 95-98°C.

[0042] After the reaction time is up, reduce the temperature of the material to below 75°C, add 2.5g of catalyst FA, control the pH value within the range of 7.0-7.5, add 50kg of urea, and after stirring and dissolving, vacuum dehydrate, the dehydration amount is 340-350kg.

[0043] After the dehyd...

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PUM

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Abstract

The invention provides a low-cost, high-quality, high-strength and easy-to-collapse special heat box resin binder for thin-walled nonferrous metal castings and a preparation method thereof. The binder includes formaldehyde, catalyst, furfuryl alcohol, disintegrating agent, urea, melamine, methanol and silane; wherein, the urea is added in two times, the molar ratio of formaldehyde to the urea added for the first time is 2.2 to 2.4, and the formaldehyde to the second The molar ratio of urea added for the first time is 1.8-2.0; the addition of furfuryl alcohol is 12.5-13.5% of the mass of formaldehyde; the addition of disintegrating agent is 6.5-8.5% of the mass of formaldehyde; the addition of melamine is 8.0-10.0 %; the amount of methanol added is 24.0-28.0% of the mass of formaldehyde; the amount of silane added is 0.7-0.8% of the mass of formaldehyde; the preparation method includes an addition reaction stage, an etherification and polycondensation reaction stage and an adjustment reaction stage. The invention can be applied in the field of adhesives.

Description

technical field [0001] The invention relates to an adhesive, in particular to a special hot box resin adhesive for thin-walled non-ferrous metal castings, and a preparation method of the adhesive. Background technique [0002] The most common non-ferrous metal thin-walled castings are plumbing equipment, lighting, etc., and its materials are copper, zinc, magnesium, and aluminum alloy. The casting mold of the product is mainly realized through the combination of steel mold and sand core. The hot core box resin sand process requires high precision and good surface roughness of the castings. It does not need to be processed inside, and it is difficult or even impossible to process. It is also required that the castings have no blisters, no pores, good collapsibility, and are environmentally friendly and energy-saving. There are higher requirements. At present, urea-formaldehyde resin sand and coated sand are used in the sand core making process of such castings in China, whic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J161/32C08G12/42
Inventor 刘春晶谢树忠李方义
Owner 广东省铸力铸材科技有限公司