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Preparation method of graphene modified phenolic resin for precoated sand

A graphene modification, phenolic resin technology, applied in the direction of manufacturing tools, casting molding equipment, metal processing equipment, etc., can solve the problems of reduced core strength, loose core surface, large environmental pollution, etc., to increase the normal temperature The effect of tensile strength, content reduction and environmental pollution reduction

Pending Publication Date: 2020-12-15
SHANDONG YUSHIJU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still many problems in the current phenolic resin material for coated sand. In the casting process of some high-performance materials, the coated sand added with phenolic resin is prone to core deformation and breakage, and the core surface is loose. Local strength reduction and other problems, and the phenolic resin contains a large amount of phenol and formaldehyde, which has great environmental pollution

Method used

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  • Preparation method of graphene modified phenolic resin for precoated sand

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preparation example Construction

[0026] A preparation method of graphene-modified phenolic resin for coated sand, comprising the following steps:

[0027] ① Add phenol and oxalic acid to the reaction kettle, raise the temperature to 80-100°C, add formaldehyde dropwise to the reaction kettle, after the dropwise addition, reflux for 1-3 hours, add dialdehyde, and reflux until the free phenol content is less than 1.0% , distillation dehydration, when the temperature rises to 160 ° C, turn on the vacuum, continue dehydration for 0.5 to 1 hour, and obtain the reaction solution;

[0028] The dialdehyde is succinaldehyde or / and glutaraldehyde;

[0029] ② Cool the reaction solution below 100°C, add compound modifier, stir for 0.5-1 hour, add organic amine to it, heat up to 130-135°C, then add modified coupling agent, heat up to 140-145°C, When the measured polymerization rate is 63-67s, the temperature is raised to 145-150°C and the material is discharged to obtain a graphene-modified phenolic resin for coated sand;...

Embodiment 1

[0045] A preparation method of graphene-modified phenolic resin for coated sand, comprising the following steps:

[0046] ①Add 500kg of phenol and 2.5kg of oxalic acid into the reaction kettle, raise the temperature to 80°C, add 250kg of formaldehyde dropwise to the reaction kettle, and reflux for 1 hour after the addition, add 10kg of dialdehyde, and reflux until the free phenol content is less than 1.0% , distilled and dehydrated, and when the temperature rose to 160°C, the vacuum was turned on, and the dehydration was continued for 0.5 hours to obtain a reaction solution;

[0047] The dialdehyde is succinaldehyde;

[0048] ② Cool the reaction solution below 100°C, add 0.5kg of composite modifier, stir for 0.5 hours, add 5kg of organic amine to it, raise the temperature to 130°C, then add 2.5kg of modified coupling agent, raise the temperature to 140°C, measure When the polymerization speed is 63-67s, heat up to 145°C and discharge to obtain graphene-modified phenolic resin...

Embodiment 2

[0053] A preparation method of graphene-modified phenolic resin for coated sand, comprising the following steps:

[0054] ①Add 500kg of phenol and 25kg of oxalic acid into the reaction kettle, raise the temperature to 100°C, add 300kg of formaldehyde dropwise to the reaction kettle, reflux for 3 hours after the addition, add 20kg of dialdehyde, and reflux until the free phenol content is less than 1.0% , distillation dehydration, when the temperature rises to 160 ° C, turn on the vacuum, continue dehydration for 1 hour, and obtain the reaction solution;

[0055] The dialdehyde is glutaraldehyde;

[0056] ② Cool the reaction solution below 100°C, add 2.5kg of composite modifier, stir for 1 hour, add 25kg of organic amine, raise the temperature to 135°C, then add 5kg of modified coupling agent, raise the temperature to 145°C, measure the polymerization When the speed is 63-67s, heat up to 150°C and discharge to obtain graphene-modified phenolic resin for coated sand;

[0057] ...

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Abstract

According to a preparation method of graphene modified phenolic resin for precoated sand, graphene, a composite modifier, and modified coupling agent are used for modifying the phenolic resin, so thatthe strength and the toughness of the phenolic resin can be obviously improved, and the graphene modified phenolic resin is suitable for manufacturing the precoated sand with high strength and high toughness; meanwhile, dialdehyde is added in the production process of the phenolic resin, the bifunctional aldehyde compound can react with phenol to form a macromolecular grid structure, phenolic resin molecules with high molecular weight are obtained, the content of phenol can be effectively reduced, and environmental pollution is reduced. By adding the composite modifier, the fluidity is improved, the polymerization speed is greatly reduced, the curing time of the phenolic resin is prolonged, the heat-resisting time can be greatly prolonged, and the collapsibility and the normal-temperaturetensile strength are improved; and the silane coupling agent can be better dispersed in the phenolic resin through the modified coupling agent, and the crosslinking condition of the silane coupling agent is effectively improved.

Description

technical field [0001] The invention relates to the technical field of phenolic resins, in particular to a preparation method of graphene-modified phenolic resins for coated sand. Background technique [0002] Phenolic resin is the earliest high-performance synthetic resin in industrial application. It has many advantages such as abundant raw materials, cheap price, low production cost and wide application. In addition, phenolic resin materials have excellent thermodynamic properties, good chemical stability and excellent bonding performance. Since its inception, phenolic resin has been one of the best-selling products in industrial products. Graphene is one of the materials with the highest strength known at present, and has good toughness, especially the oxidized graphene, which has been used as an excellent modifier to prepare various multifunctional polymer composites, high-strength porous ceramics material, which enhances many special properties of composite materials....

Claims

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Application Information

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IPC IPC(8): C08G8/28B22C1/22B22C1/02
CPCC08G8/28B22C1/2253B22C1/02
Inventor 张家畅赵敏南张彬张鹏陆欢欢
Owner SHANDONG YUSHIJU CHEM CO LTD
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