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Alcohol-based coating for large castings and preparation method thereof

A technology for large-scale castings and coatings, applied in casting molding equipment, coatings, cores, etc., can solve problems such as high cost and difficult to meet actual needs, easy hardening of refractory aggregates, poor brushing performance, etc., to achieve good sand resistance Functional, not easy to delaminate, not easy to harden effect

Active Publication Date: 2019-07-09
CHINA ERZHONG GRP DEYANG HEAVY IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And these alcohol-based casting coatings all have various deficiencies, or the performance is not ideal, or the cost is very high and it is difficult to meet the actual needs.
And other suspending agents such as CN104841876A "a kind of production method of alcohol-based casting coating thixotropic suspending agent", CN102371334A "a kind of preparation method of casting alcohol-based coating suspending agent", "CN104741517A binary casting coating suspending agent" and other patents The proposed suspending agent also needs to add water during the preparation process. The powder casting coating prepared without water suspending agent has many problems in actual use, such as poor brushing performance, poor leveling, and poor suspension of the coating. Stratification will occur over time, and refractory aggregates are easy to harden
Therefore, at present, these coatings have various defects in large steel castings produced by alkaline phenolic resin sand. Therefore, the development has ideal suspension properties, such as the use of fully activated lithium-based bentonite. The water in it does not cause various hydrophobic properties. Materials such as phenolic resin, polyvinyl butyral resin and other gelled high-performance alcohol-based casting coatings have become a very urgent task

Method used

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  • Alcohol-based coating for large castings and preparation method thereof
  • Alcohol-based coating for large castings and preparation method thereof
  • Alcohol-based coating for large castings and preparation method thereof

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preparation example Construction

[0037] The preparation method of modified rosin is as follows: add 1 part of rosin to the reaction kettle and heat up to 160-210°C, and after maintaining for 0.5-1.0 hours, use anhydrous hydrogen chloride, zinc chloride, aluminum chloride, gallium chloride and trifluoro At least one of boron chloride is used as a catalyst, and the amount of catalyst added is 0.01 to 0.03 times of the weight of rosin, and at least one of sucrose, glucose, fructose and maltose is added in an amount of 0.15 to 0.3 times of the weight of rosin. Mix well, keep warm at 215-220°C for 0.4-0.6 hours, then raise the temperature to 250-285°C at a speed of 3-5°C / 5 minutes, keep warm for 3-7 hours, dehydrate under reduced pressure for 1.5-2.0 hours, wait for the acid value to drop To 23 ~ 26mgKOH / g, softening point ≥ 130 ° C, cooled and discharged to obtain modified rosin.

[0038] Low-viscosity polyvinyl butyral resin: its degree of polymerization is 300-400; molecular weight is 18×10 4 ~27×10 4 / mole,...

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Abstract

The invention relates to alcohol-based coating for large castings and a preparation method of the alcohol-based coating, in particular to casting coating for large nuclear power steel castings for basic phenolic resin sand molding production, and belongs to the field of casting coating. The casting coating is prepared from modified zirconium powder, lithium-based bentonite paste, magnesium aluminum silicate paste, alcohol soluble alky acid modified resin, modified rosin, low-viscosity polyvinyl butyral resin and carrier liquid. As for the coating, the suspension property (24 hours) is larger than 98%, the adhesive force is level 1, the gas volume is smaller than 10 ml / g, the solid content is larger than 73%, the coating abrasion performance is 0.06 g, and no burnt-on sand exists on the surfaces of the nuclear power castings of 200 tons of molten steel or above.

Description

technical field [0001] The invention relates to an alcohol-based coating for large castings, in particular to a casting coating for large nuclear power steel castings produced by alkaline phenolic resin sand molding, and belongs to the field of casting coatings. Background technique [0002] As we all know, alcohol-based coatings have high temperature resistance, erosion resistance, and burst resistance. Compared with traditional water-based coatings, which have slow drying speed, long construction period and high energy consumption, alcohol-based coatings have irreplaceable advantages. Therefore, alcohol-based casting coatings play a pivotal role in the production of castings, especially in large steel castings produced by alkaline phenolic resin sand. Its quality, especially the performance related to suspension, not only determines the quality of castings The inherent and apparent quality of the product, but also determines the production cycle of the product, the labor i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00
CPCB22C3/00
Inventor 白敏唐贤其
Owner CHINA ERZHONG GRP DEYANG HEAVY IND
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