Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of preparation method of coating for sand core that improves foundry quality

A technology for sand cores and coatings, which is applied in casting and molding equipment, coatings, cores, etc., can solve the problems of poor anti-sticking sand and sand washing ability of coatings, high prices, and lack of zircon powder resources.

Active Publication Date: 2020-10-23
HANSHAN RONGSHENG MACHINERY CASTING
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"But the shortcomings of the above patent content are: 1. Zircon powder up to 30% is used. my country's zircon powder resources are scarce, most of which rely on imports, and the price is expensive, resulting in limited sources of raw materials for coatings and increased costs.
2. There are many refractory aggregate components. If the raw material quality of a certain component fluctuates, it will affect the performance of the entire coating system, and it is difficult to control the sintering performance and other properties of the coating.
3. Using polyvinyl alcohol organic binder, the high-temperature strength of the coating is low, and the coating has poor ability to resist sand sticking and sand washing

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for preparing a coating for a sand core that improves casting quality, comprising the steps of:

[0024] S1. Corresponding cyclodextrin, ethylenediamine, 2-pyrenebutyric acid, N-hydroxysuccinimide, dimethylaminopyridine, and N,N-dimethylformamide according to the weight-to-volume ratio of 20g:70ml:5g: 2g: 1g: 360ml are mixed together and put into the reactor, then add dicyclohexylcarbodiimide into the reactor, stir continuously for 3 hours, take it out, put it into acetone for precipitation, and then centrifuge to take out the supernatant to get the mixture A standby;

[0025] S2, immerse the graphene nanosheets in the nitric acid solution, then filter out after ultrasonic treatment for 2 hours, then rinse with deionized water until neutral and dry for later use;

[0026] S3, putting the graphene nanosheets treated in step S2 into the reactor, then adding an acylating agent to the reactor, filtering out after ultrasonic treatment for 20min, then washing with d...

Embodiment 2

[0037] A method for preparing a coating for a sand core that improves casting quality, comprising the steps of:

[0038] S1. Cyclodextrin, ethylenediamine, 2-pyrenebutyric acid, N-hydroxysuccinimide, dimethylaminopyridine, and N,N-dimethylformamide correspond to the weight-to-volume ratio of 23g:80ml:6g: 2.6g: 1.3g: 370ml are mixed together and put into the reactor, then add dicyclohexylcarbodiimide into the reactor, stir continuously for 4 hours, take it out, put it into acetone for precipitation, and then centrifuge to take out the supernatant Get mixture A for later use;

[0039]S2, immerse the graphene nanosheets in the nitric acid solution, then filter out after ultrasonic treatment for 2.5h, then rinse with deionized water until neutral and dry for later use;

[0040] S3, putting the graphene nanosheets treated in step S2 into the reactor, then adding an acylating agent to the reactor, filtering out after ultrasonic treatment for 22min, then washing with deionized water...

Embodiment 3

[0051] A method for preparing a coating for a sand core that improves casting quality, comprising the steps of:

[0052] S1. Cyclodextrin, ethylenediamine, 2-pyrenebutyric acid, N-hydroxysuccinimide, dimethylaminopyridine, and N,N-dimethylformamide correspond to 25g:90ml:7g according to the weight-to-volume ratio: 3g: 1.5g: 380ml were mixed together and put into the reactor, then added dicyclohexylcarbodiimide into the reactor, stirred continuously for 5 hours, took it out, put it into acetone for precipitation, and then centrifuged to take out the supernatant to obtain Mixture A is standby;

[0053] S2, immerse the graphene nanosheets in the nitric acid solution, then filter out after ultrasonic treatment for 3 hours, then rinse with deionized water until neutral and dry for later use;

[0054] S3, putting the graphene nanosheets treated in step S2 into the reactor, then adding an acylating agent to the reactor, filtering out after ultrasonic treatment for 25min, then washin...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a sand core coating preparation method for improving casting quality. The method comprises the following steps: S1, preparing a mixture A; S2, carrying out acid leaching treatment on the graphene nanosheets; S3, acylating the graphene nanosheets; S4, preparing a material B; S5, weighing raw materials; and S6, preparing the finished product paint. The preparation method is simple in overall process, reasonable in matching of all steps, low in production cost, safe and environment-friendly, and the prepared coating has good strength and impact resistance, is high in heatconductivity and not easy to crack, effectively improves the surface precision of a casting and improves the casting quality.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a preparation method of a coating for a sand core that improves casting quality. Background technique [0002] At present, in the molding and core preparation process, due to the good formability of the coated sand, the high strength of the sand core, the clear outline, and the high dimensional accuracy, it can manufacture the most complex shell cores, and it has developed rapidly abroad. Now, coated sand has been widely used in automobiles, diesel engines, hydraulic parts and other industries, and can meet the production requirements of various complex precision castings. [0003] The characteristics of coatings for coated sand cores are: ① Due to the fine particle size of the shell core: generally 70 / 140 and strong surface hydrophobicity, the coating should have strong permeability. At the same time, the shape of the shell core is complex and the sand core is thin, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00C08G83/00
CPCB22C3/00C08G83/001
Inventor 王安
Owner HANSHAN RONGSHENG MACHINERY CASTING
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com