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Special high-strength modified phenolic resin adhesive for precoated sand and preparation method of special high-strength modified phenolic resin adhesive

A phenolic resin and binder technology, used in manufacturing tools, casting molding equipment, metal processing equipment, etc., can solve the problems affecting the quality of castings, reducing the yield of castings, and high resin usage, and achieve excellent product quality. Comprehensive performance, The effect of promoting environmental protection, energy saving and emission reduction, and improving the tensile strength at room temperature

Inactive Publication Date: 2016-02-24
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

However, the coated sand produced by ordinary phenolic resin usually has disadvantages such as low strength and large gas generation. Therefore, the amount of resin used is usually high, which not only increases the cost, but also leads to excessive gas generation. It is often easy to use when casting complex sand molds. Pore ​​defects in castings seriously affect the quality of castings, reduce the yield of castings, and indirectly increase the cost of castings

Method used

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  • Special high-strength modified phenolic resin adhesive for precoated sand and preparation method of special high-strength modified phenolic resin adhesive
  • Special high-strength modified phenolic resin adhesive for precoated sand and preparation method of special high-strength modified phenolic resin adhesive
  • Special high-strength modified phenolic resin adhesive for precoated sand and preparation method of special high-strength modified phenolic resin adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In a device equipped with a three-necked flask, a stirrer and a coil condenser, put 1100g of phenol, 100g of o-cresol, 782g of 37% formaldehyde, and 1.8g of catalyst zinc acetate, and control the temperature at a reaction temperature of 98-102°C for 80 minutes.

[0019] After the reaction time is up, add 6g of oxalic acid and 4g of formic acid, control the temperature at 98-102°C, and react for 130min.

[0020] After the reaction time is up, the material is lowered to below 65°C, and vacuum dehydrated, the dehydration amount is 803g.

[0021] After the dehydration is completed, add 33g of polyamide and 4.5g of silane, stir evenly, and granulate.

[0022] The test results of performance indicators are as follows:

[0023]

Embodiment 2

[0025] In a 2000L reactor, put 510g of phenol, 80g of o-cresol, 350g of 37% formaldehyde, add 0.8g of catalyst zinc acetate, control the temperature at the reaction temperature of 98-102°C, and react for 90min.

[0026] After the reaction time is up, add 3.5g of oxalic acid and 2.7g of formic acid, control the temperature at 98-102°C, and react for 110min.

[0027] After the reaction time is up, the material is lowered to below 65°C, and vacuum dehydrated, the dehydration amount is 351g.

[0028] After the dehydration is completed, add 25g of polyamide and 2.95g of silane, stir evenly, and granulate.

[0029] The test results of performance indicators are as follows:

[0030]

Embodiment 3

[0032] In a 2000L reactor, put 600g of phenol, 68g of bisphenol A, 398g of 37% formaldehyde, add 1.2g of catalyst zinc acetate, control the temperature at the reaction temperature of 98-102°C, and react for 70min.

[0033] After the reaction time is up, add 5.1g of oxalic acid and 3.6g of formic acid, control the temperature at 98-102°C, and react for 140min.

[0034] After the reaction time is up, the material is lowered to below 65°C, and vacuum dehydrated, the dehydration amount is 372g.

[0035] After the dehydration is completed, add 36g of polyamide and 2.6g of silane, stir evenly, and granulate.

[0036] The test results of performance indicators are as follows:

[0037]

[0038] It can be seen from the above examples that the present invention modifies the phenolic resin with two kinds of modifiers, adopts secondary catalysis in the process, optimizes the molecular structure, improves the toughness of the resin, and compares the normal temperature tensile strength ...

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Abstract

The invention provides a special high-strength modified phenolic resin adhesive for precoated sand and a preparation method of the special high-strength modified phenolic resin adhesive. The adhesive comprises phenol, formaldehyde, a catalyst, a modifier 1, a modifier 2 and silane, wherein the mole ratio of phenol to formaldehyde is 1:(0.7-0.8), the adding quantity of the modifier 1 accounts for 3%-30% of the mass of phenol, the adding quantity of the modifier 2 accounts for 0.5%-10% of the mass of phenol, and the adding quantity of silane accounts for 0.3%-0.8% of the mass of phenol. The preparation method is simple and convenient to operate, and reduction of the enterprise cost and promotion of energy saving and emission reduction are facilitated. The adhesive and the preparation method can be applied to the field of adhesives.

Description

technical field [0001] The invention relates to a binder, in particular to a special high-strength modified phenolic resin binder for coated sand, and a preparation method of the binder. Background technique [0002] Molding sand and core sand that have been covered with a layer of solid resin film on the surface of sand grains before molding and core making are called coated sand. Coated sand is used for casting with simple process, rapid prototyping (core), good fluidity, and high casting surface quality. Excellent, easy to remove sand, convenient for long-term storage, wide application range and other advantages, so it is favored by the industry and is more and more widely used. However, the coated sand produced by ordinary phenolic resin usually has disadvantages such as low strength and large gas generation. Therefore, the amount of resin used is usually high, which not only increases the cost, but also leads to excessive gas generation. It is often easy to use when cas...

Claims

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Application Information

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IPC IPC(8): C08G8/28C08G8/10B22C1/22
CPCC08G8/28B22C1/2253C08G8/10
Inventor 刘春晶谢树忠闵云浩
Owner 广东省铸力铸材科技有限公司