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 de

Method used

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  • Preparation method of graphene modified phenolic resin for precoated sand

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Example Embodiment

[0026] A method of preparing graphite coated sand-modified phenolic resin, comprising the steps of:

[0027] ① When phenol, oxalic acid was added to the kettle and heated to 80 ~ 100 ℃, formaldehyde was added dropwise to the kettle, after the addition was complete the reaction was refluxed for 1 to 3 hours, was added dialdehyde, is returned to the free phenol content of less than 1.0% , dehydration distillation, when the temperature was raised to 160. deg.] C, vacuum is turned on, dehydration continues 0.5 to 1 hour to obtain a reaction solution;

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

[0029] ② The reaction solution was cooled to below 100 deg.] C, the modifier compound was added, stirred for 0.5 to 1 hour, the organic amine is added thereto, heated to 130 ~ 135 ℃, modified coupling agent was then added, heated to 140 ~ 145 ℃, poly measured speed of 63 ~ 67s, the temperature was raised to 145 ~ 150 ℃ discharge, resulting graphene coated sand modified p...

Example Embodiment

[0044] Example 1

[0045] A method of preparing graphite coated sand-modified phenolic resin, comprising the steps of:

[0046] ① the 500kg of phenol, 2.5 kg of oxalic acid was added to the kettle and heated to 80 ℃, 250kg of formaldehyde was added dropwise to the kettle, after the addition was complete the reaction was refluxed for 1 hour, 10kg dialdehyde, is returned to the free phenol content of less than 1.0% when, dehydration distillation, when the temperature was raised to 160. deg.] C, vacuum is turned on, the dehydration continued for 0.5 hour to obtain a reaction solution;

[0047] The dialdehyde is succinaldehyde;

[0048] ② The reaction solution was cooled to below 100 deg.] C, 0.5kg compound modifier is added, stirred for 0.5 hour, and thereto is added an organic amine 5kg heated to 130. deg.] C, then added 2.5kg modified coupling agent, heated to 140 deg.] C, measured Jackspeed is 63 ~ 67s, the discharge temperature was raised to 145 deg.] C, to obtain graphene coated...

Example Embodiment

[0052] Example 2

[0053] A method of preparing graphite coated sand-modified phenolic resin, comprising the steps of:

[0054] ① While phenol 500kg, 25kg of oxalic acid was added to the kettle and heated to 100 deg.] C, 300kg of formaldehyde was added dropwise to the kettle, after the addition was complete the reaction was refluxed for three hours, 20kg dialdehyde, is returned to the free phenol content of less than 1.0% , dehydration distillation, when the temperature was raised to 160. deg.] C, vacuum is turned on, continued dehydrated for 1 hour to obtain a reaction solution;

[0055] The dialdehyde is glutaraldehyde;

[0056] ② The reaction solution was cooled to below 100 deg.] C, 2.5kg compound modifier is added, stirred for 1 hour, and thereto is added an organic amine 25kg, temperature was raised to 135 deg.] C, 5kg modified coupling agent was then added, temperature was raised to 145 deg.] C, measured poly speed is 63 ~ 67s, the discharge temperature was raised to 150 de...

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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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