CN110695309A - Alcohol-based film-coated sand cavity coating and preparation method thereof - Google Patents

Alcohol-based film-coated sand cavity coating and preparation method thereof Download PDF

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Publication number
CN110695309A
CN110695309A CN201911188034.7A CN201911188034A CN110695309A CN 110695309 A CN110695309 A CN 110695309A CN 201911188034 A CN201911188034 A CN 201911188034A CN 110695309 A CN110695309 A CN 110695309A
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China
Prior art keywords
alcohol
stirring
parts
stirrer
phenolic resin
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Pending
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CN201911188034.7A
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Chinese (zh)
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桑超
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桑超
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Priority to CN201911188034.7A priority Critical patent/CN110695309A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C3/00Selection of compositions for coating the surfaces of moulds, cores, or patterns

Abstract

The invention discloses an alcohol-based film-coated sand cavity coating and a preparation method thereof, wherein the coating is prepared from the following raw materials in parts by weight: 15 parts of methanol, 22.5 parts of cooked high-alumina powder, 3 parts of sodium bentonite, 0.35 part of PVB and 3.8 parts of phenolic resin. The alcohol-based precoated sand cavity coating provided by the invention can remove pockmarks, subcutaneous holes and sticky sand generated on the surface of a casting when the precoated sand process is used for casting the casting with uneven thickness and deep radian at a hot spot part, and is beneficial to reducing the cost of manpower and material resources for a casting enterprise, thereby reducing the production cost.

Description

Alcohol-based film-coated sand cavity coating and preparation method thereof
Technical Field
The invention relates to the technical field of paint preparation, in particular to an alcohol-based film-coated sand cavity paint and a preparation method thereof.
Background
At present, the clay sand process is gradually replaced by a film-covered sand process due to the disadvantages of high labor intensity, large environmental pollution, large land occupation, low production efficiency and long period.
The technology of the precoated sand is used on a core of a casting in China before, and due to the rapid development of the national foundry industry in recent years, the technology of the precoated sand slowly develops a single core of the casting into a precoated shell mold casting, the technology of the precoated sand is formed by stirring and mixing aggregates (casting raw sand, resin and other auxiliary materials) at high temperature, a core shooter in a foundry is used for shooting the precoated sand into various casting cavities heated to certain temperature under high pressure, the time and the temperature of the period are determined by curing and crusting (according to the size and the thickness of the casting shell) for a certain period, then a core shooting cylinder or an oil cylinder is used for separating the casting mold, the membrane shell is taken out, the natural curing is carried out for 12 hours, a certain strength is obtained, and the casting is poured by the foundry.
Because the cast products are various, particularly the wall thickness of the cast and the radian of the cast with uneven thickness of the hot spot part of the cast are deep, the surface of the product manufactured by the sand-coated technology has a plurality of irregular pits, and a plurality of subcutaneous air holes are generated after some cast is processed, so that the cast is scrapped or needs to be repeatedly welded, repaired and polished, and the production cost is increased.
Disclosure of Invention
Aiming at the technical defects, the invention aims to provide an alcohol-based film-coated sand cavity coating and a preparation method thereof, and aims to solve the problem that pits or subcutaneous air holes exist on the surface of a product manufactured by the existing film-coated sand process.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides an alcohol-based film-coated sand cavity coating which is prepared from the following raw materials in parts by weight: 15 parts of methanol, 22.5 parts of cooked high-alumina powder, 3 parts of sodium bentonite, 0.35 part of PVB and 3.8 parts of phenolic resin.
Preferably, the calcined high-alumina powder is 320 meshes calcined high-alumina powder and the content of alumina is more than or equal to 85%.
Preferably, the PVB is powdered, 15S medium viscous.
Preferably, the phenolic resin is thermoplastic phenolic resin powder.
The invention also provides a preparation method of the alcohol-based film-coated sand cavity coating, which comprises the following steps:
s1, weighing methanol with the formula ratio, dividing equally, and placing in a container A and a container B for later use;
s2, weighing the high-alumina powder with the formula amount, placing the high-alumina powder with the formula amount into a paint stirrer for stirring, wherein the rotating speed of the paint stirrer is 50r/min, and slowly pouring the sodium bentonite with the formula amount into the paint stirrer during stirring;
s3, weighing the phenolic resin with the formula ratio, slowly pouring the phenolic resin into the container A, and stirring for ten minutes by using a gun type stirrer at the rotating speed of 2800r/min until the phenolic resin powder is completely dissolved;
s4, weighing PVB in a formula amount, slowly pouring the PVB into the container B, and stirring for ten minutes by using a gun type stirrer at the rotating speed of 2800r/min until PVB powder is completely dissolved;
s5, pouring the solution obtained in the step S3 into a paint stirrer, and stirring for five minutes, wherein the rotating speed of the paint stirrer is 50 r/min;
s6, pouring the solution obtained in the step S4 into a paint stirrer, and stirring for ten minutes at the rotating speed of 50r/min to obtain a finished product of the alcohol-based precoated sand cavity paint;
and S7, opening a discharge hole at the bottom of the stirrer, discharging the finished product of the alcohol-based film-coated sand-shaped cavity coating while stirring, then filling the finished product into a container, and sealing the container.
The invention has the beneficial effects that: the alcohol-based precoated sand cavity coating provided by the invention can remove pockmarks, subcutaneous holes and sticky sand generated on the surface of a casting when the precoated sand process is used for casting the casting with uneven thickness and deep radian at a hot spot part, and is beneficial to reducing the cost of manpower and material resources for a casting enterprise, thereby reducing the production cost.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An alcohol-based film-coated sand cavity coating is prepared from the following raw materials in parts by weight: 15kg of methanol, 22.5kg of cooked high-alumina powder, 3kg of sodium bentonite, 0.35kg of PVB and 3.8kg of phenolic resin; wherein the cooked high-alumina powder is 320 meshes of cooked high-alumina powder, the content of alumina is more than or equal to 85 percent, the PVB is powdery, the PVB is sticky in 15S, and the phenolic resin is thermoplastic phenolic resin powder.
The preparation method of the alcohol-based film-coated sand cavity coating comprises the following steps:
s1, weighing methanol with the formula ratio, dividing equally, and placing in a container A and a container B for later use;
s2, weighing the high-alumina powder with the formula amount, placing the high-alumina powder with the formula amount into a paint stirrer for stirring, wherein the rotating speed of the paint stirrer is 50r/min, and slowly pouring the sodium bentonite with the formula amount into the paint stirrer during stirring;
s3, weighing the phenolic resin with the formula ratio, slowly pouring the phenolic resin into the container A, and stirring for ten minutes by using a gun type stirrer at the rotating speed of 2800r/min until the phenolic resin powder is completely dissolved;
s4, weighing PVB with the formula amount, slowly pouring the PVB into the container B, and stirring for ten minutes by using a gun type stirrer at the rotating speed of 2800r/min until the PVB is completely dissolved;
s5, pouring the solution obtained in the step S3 into a paint stirrer, and stirring for five minutes, wherein the rotating speed of the paint stirrer is 50 r/min;
s6, pouring the solution obtained in the step S4 into a paint stirrer, and stirring for ten minutes at the rotating speed of 50r/min to obtain a finished product of the alcohol-based precoated sand cavity paint;
and S7, opening a discharge hole at the bottom of the stirrer, discharging the finished product of the alcohol-based film-coated sand-shaped cavity coating while stirring, then filling the finished product into a container, and sealing the container.
Comparative example:
a preparation method of a precoated sand cavity coating is characterized in that aggregate is adopted as a raw material to prepare the precoated sand cavity coating, and a conventional preparation method is adopted.
The coating prepared by the comparative example and the embodiment of the invention is tested, 400 castings are divided into two groups during testing, 200 castings in each group are processed, and the testing steps are as follows: the two groups of castings are respectively processed by the coatings prepared by different preparation methods, and the castings are detected after the processing is finished, wherein the test results are shown in the following table 1:
item Comparative example Examples of the invention
Product (person) containing pockmark 15 4
Product with air hole 12 2
Product (body) with sand stuck on surface 18
As can be seen from Table 1, the coating prepared by the embodiment of the invention can effectively remove pockmarks and subcutaneous bubbles on the surface of a casting, and can effectively reduce the sand sticking rate of the surface of the casting and reduce the production cost of a casting enterprise.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (5)

1. The alcohol-based film-coated sand cavity coating is characterized by being prepared from the following raw materials in parts by weight: 15 parts of methanol, 22.5 parts of cooked high-alumina powder, 3 parts of sodium bentonite, 0.35 part of PVB and 3.8 parts of phenolic resin.
2. The alcohol-based precoated sand-type cavity coating according to claim 1, wherein the calcined high-alumina powder is 320-mesh calcined high-alumina powder and the content of alumina is not less than 85%.
3. The alcohol-based coated sand cavity coating of claim 1, wherein the PVB is powdered and 15S medium viscosity.
4. The alcohol-based film-coated sand cavity coating of claim 1, wherein the phenolic resin is thermoplastic phenolic resin powder.
5. The preparation method of the alcohol-based film-coated sand cavity coating as claimed in claim 1, which is characterized by comprising the following steps:
s1, weighing methanol with the formula ratio, dividing equally, and placing in a container A and a container B for later use;
s2, weighing the high-alumina powder with the formula amount, placing the high-alumina powder with the formula amount into a paint stirrer for stirring, wherein the rotating speed of the paint stirrer is 50r/min, and slowly pouring the sodium bentonite with the formula amount into the paint stirrer during stirring;
s3, weighing the phenolic resin with the formula ratio, slowly pouring the phenolic resin into the container A, and stirring for ten minutes by using a gun type stirrer at the rotating speed of 2800r/min until the phenolic resin powder is completely dissolved;
s4, weighing PVB with the formula amount, slowly pouring the PVB into the container B, and stirring for ten minutes by using a gun type stirrer at the rotating speed of 2800r/min until the PVB is completely dissolved;
s5, pouring the solution obtained in the step S3 into a paint stirrer, and stirring for five minutes, wherein the rotating speed of the paint stirrer is 50 r/min;
s6, pouring the solution obtained in the step S4 into a paint stirrer, and stirring for ten minutes at the rotating speed of 50r/min to obtain a finished product of the alcohol-based precoated sand cavity paint;
and S7, opening a discharge hole at the bottom of the stirrer, discharging the finished product of the alcohol-based film-coated sand-shaped cavity coating while stirring, then filling the finished product into a container, and sealing the container.
CN201911188034.7A 2019-11-28 2019-11-28 Alcohol-based film-coated sand cavity coating and preparation method thereof Pending CN110695309A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911188034.7A CN110695309A (en) 2019-11-28 2019-11-28 Alcohol-based film-coated sand cavity coating and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911188034.7A CN110695309A (en) 2019-11-28 2019-11-28 Alcohol-based film-coated sand cavity coating and preparation method thereof

Publications (1)

Publication Number Publication Date
CN110695309A true CN110695309A (en) 2020-01-17

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1785883A (en) * 2005-12-09 2006-06-14 长安汽车(集团)有限责任公司 Film covered sand core fast drying repair paste
CN104014729A (en) * 2014-06-19 2014-09-03 杨俊新 Quickly dried alcohol based spraying casting coating and spraying method thereof
CN106270373A (en) * 2016-09-27 2017-01-04 湖北工业大学 A kind of precoated sand sand mold alcohol-base foundry coating and preparation method thereof
CN107414016A (en) * 2017-08-02 2017-12-01 湖北工业大学 A kind of cast paint for overlay film sand mold and preparation method thereof
CN108044022A (en) * 2018-01-13 2018-05-18 合肥市瑞宏重型机械有限公司 It is a kind of for alcohol-base paint of sand casting and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1785883A (en) * 2005-12-09 2006-06-14 长安汽车(集团)有限责任公司 Film covered sand core fast drying repair paste
CN104014729A (en) * 2014-06-19 2014-09-03 杨俊新 Quickly dried alcohol based spraying casting coating and spraying method thereof
CN106270373A (en) * 2016-09-27 2017-01-04 湖北工业大学 A kind of precoated sand sand mold alcohol-base foundry coating and preparation method thereof
CN107414016A (en) * 2017-08-02 2017-12-01 湖北工业大学 A kind of cast paint for overlay film sand mold and preparation method thereof
CN108044022A (en) * 2018-01-13 2018-05-18 合肥市瑞宏重型机械有限公司 It is a kind of for alcohol-base paint of sand casting and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
河南省机械工程学会: "《铸工考工问答》", 31 December 1983, 郑州:河南科学技术出版社 *

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