CN109014037B - Repair paste for lost foam and preparation method thereof - Google Patents
Repair paste for lost foam and preparation method thereof Download PDFInfo
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- CN109014037B CN109014037B CN201810863885.6A CN201810863885A CN109014037B CN 109014037 B CN109014037 B CN 109014037B CN 201810863885 A CN201810863885 A CN 201810863885A CN 109014037 B CN109014037 B CN 109014037B
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- paste
- lost foam
- casting
- repair
- repairing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
- B22C7/023—Patterns made from expanded plastic materials
Abstract
The invention discloses a repair paste for a lost foam and a preparation method thereof, wherein the repair paste comprises polyvinyl butyral and polyvinyl acetate emulsion, wherein the mass ratio of the polyvinyl acetate emulsion to the polyvinyl butyral is 1: 1.5-4. The repairing paste is easy to gasify, a mold repaired by using the repairing paste does not leave a trace on a casting after pouring, the surface of the casting is smooth, the gas evolution of the repairing paste is small, the pungent smell is small, and the repairing paste is environment-friendly. Moreover, the repair paste has the advantages of low raw material cost, simple preparation method, simple and convenient operation during repair and easy popularization.
Description
Technical Field
The invention relates to a repairing paste for a casting lost foam, in particular to a repairing paste for a lost foam and a preparation method thereof.
Background
Lost foam casting is one of the most advanced casting processes in the world at present, is known as a revolution in casting history, and is called as 21 st century green casting at home and abroad. Brief introduction of principle of lost foam casting process: the lost foam casting is that a model is gasified and lost in the casting process, and the model is a pattern used in the molding. And in the sand casting, the pattern is taken out, and molten metal is poured into the cavity to form a casting. The lost foam casting is to make a pattern with specific foamed plastic, then to embed it into molding sand (generally dry sand or dry sand containing adhesive), to pour molten metal into the pattern after certain treatment (mainly vibration and negative pressure extraction), until the molten metal gradually softens, liquefies, decomposes and gasifies the foamed plastic pattern, to form a cavity-casting formed by the pattern. Therefore, lost foam casting is also called gasification mold casting, full mold casting, and cavity-less casting.
The mold for lost foam casting is formed by a mold, and a cavity for lost foam casting is formed by the mold, so that the quality of a final part is determined by the quality of the mold. The mold is produced using a forming die, and therefore the quality of the forming die determines the quality of the mold and ultimately the quality of the part produced. From this relationship, we understand that we can easily see the role and irreplaceable position of the forming die in the production of lost foam casting.
Lost foam casting has some fundamental requirements on the design of the mold:
(1) the mold must conform to the requirements of the casting shape, size and surface roughness.
(2) Simple structure, convenient manufacture and convenient repair and maintenance.
In the process of manufacturing the white mold, adhesive gaps and defects on the surface of the mold are inevitably generated, and the precision of the casting is directly influenced if the adhesive gaps and the defects are not repaired. The prior repairing common factories use adhesive tapes and white paper, the materials used for the repairing can leave traces, the surface smoothness of castings is influenced, other repairing pastes are difficult to gasify, the gas evolution is large, and the pungent smell is large.
Disclosure of Invention
The invention aims to provide a repair paste for a lost foam and a repair method for the lost foam, wherein the repair paste is easy to gasify, a mold repaired by using the repair paste does not leave a trace on a casting after casting, the surface of the casting is smooth, the gas evolution of the repair paste is small, the pungent smell is small, and the repair paste is relatively environment-friendly. Moreover, the repair paste has the advantages of low raw material cost, simple preparation method, simple and convenient operation during repair and easy popularization. The repairing method for the lost foam by using the repairing paste is simple and convenient to operate, has good bonding performance with the lost foam, is short in repairing standing time, and has high practical value.
In order to achieve the aim, the invention provides a repair paste for a lost foam, which comprises polyvinyl butyral and polyvinyl acetate emulsion, wherein the mass ratio of the polyvinyl acetate emulsion to the polyvinyl butyral is 1: 1.5-4.
The invention also provides a preparation method of the repair paste for the lost foam, which comprises the step of mixing the polyvinyl butyral and the polyvinyl acetate emulsion according to the proportion.
The invention also provides a method for repairing the lost foam by applying the repair paste for the lost foam, which comprises the following steps:
(1) placing the lost foam on an operation table, and dipping absorbent cotton in acetone to clean the defective part of the lost foam;
(2) mixing polyvinyl butyral and polyvinyl acetate emulsion to obtain a repairing paste;
(3) coating the repair paste on the defect part, leveling and standing for 20-30 min;
wherein the mass ratio of the polyvinyl acetate emulsion to the polyvinyl butyral is 1: 1.5-4.
Through the technical scheme, the repairing paste is easy to gasify, a mold repaired by using the repairing paste does not leave a trace on a casting after pouring, the surface of the casting is smooth, the gas evolution of the repairing paste is small, the pungent smell is small, and the repairing paste is environment-friendly. Moreover, the repair paste has the advantages of low raw material cost, simple preparation method, simple and convenient operation during repair and easy popularization. The repairing method for the lost foam by using the repairing paste is simple and convenient to operate, has good bonding performance with the lost foam, is short in repairing standing time, and has high practical value.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a repair paste for a lost foam, which comprises polyvinyl butyral and polyvinyl acetate emulsion, wherein the mass ratio of the polyvinyl acetate emulsion to the polyvinyl butyral is 1: 1.5-4.
Through the technical scheme, the repairing paste is easy to gasify, a mold repaired by using the repairing paste does not leave a trace on a casting after pouring, the surface of the casting is smooth, the gas evolution of the repairing paste is small, the pungent smell is small, and the repairing paste is environment-friendly. Moreover, the repair paste has the advantages of low raw material cost, simple preparation method, simple and convenient operation during repair and easy popularization. The repairing method for the lost foam by using the repairing paste is simple and convenient to operate, has good bonding performance with the lost foam, is short in repairing standing time, and has high practical value.
In a preferred embodiment of the invention, in order to obtain easy gasification, the mould repaired by the repair paste does not leave marks on the casting after casting, the surface of the casting is smooth, the repair paste has small gas forming amount and small pungent smell, and the repair paste is environment-friendly.
In a preferred embodiment of the invention, in order to obtain easy gasification, the mould repaired by the repair paste does not leave marks on the casting after casting, the surface of the casting is smooth, the repair paste has small gas evolution and less pungent smell, and the repair paste is environment-friendly, and the number average molecular weight of polyvinyl butyral is preferably from 30k to 45 k.
In a preferred embodiment of the invention, in order to obtain easy gasification, the mould repaired by the repair paste does not leave marks on the casting after casting, the surface of the casting is smooth, the repair paste has small gas evolution and small pungent smell, and the repair paste is environment-friendly.
In a preferred embodiment of the invention, in order to obtain easy gasification, the mould repaired by the repair paste does not leave marks on the casting after casting, the surface of the casting is smooth, the repair paste has small gas evolution and small pungent smell, and is environment-friendly, and preferably, the polyvinyl butyral accounts for 65-80% by mass percent.
In a preferred embodiment of the invention, in order to obtain easy gasification, the mould repaired by the repair paste does not leave marks on the casting after casting, the surface of the casting is smooth, the repair paste has small gas evolution and small pungent smell, and is environment-friendly, and preferably, the polyvinyl butyral accounts for 70-75 percent by mass.
The invention also provides a preparation method of the repair paste for the lost foam, which comprises the step of mixing the polyvinyl butyral and the polyvinyl acetate emulsion according to the proportion.
Through the technical scheme, the repairing paste is easy to gasify, a mold repaired by using the repairing paste does not leave a trace on a casting after pouring, the surface of the casting is smooth, the gas evolution of the repairing paste is small, the pungent smell is small, and the repairing paste is environment-friendly. Moreover, the repair paste has the advantages of low raw material cost, simple preparation method, simple and convenient operation during repair and easy popularization. The repairing method for the lost foam by using the repairing paste is simple and convenient to operate, has good bonding performance with the lost foam, is short in repairing standing time, and has high practical value.
The invention also provides a method for repairing the lost foam by applying the repair paste for the lost foam, which comprises the following steps:
(1) placing the lost foam on an operation table, and dipping absorbent cotton in acetone to clean the defective part of the lost foam;
(2) mixing polyvinyl butyral and polyvinyl acetate emulsion to obtain a repairing paste;
(3) coating the repair paste on the defect part, leveling and standing for 20-30 min;
wherein the mass ratio of the polyvinyl acetate emulsion to the polyvinyl butyral is 1: 1.5-4.
Through the technical scheme, the repairing paste is easy to gasify, a mold repaired by using the repairing paste does not leave a trace on a casting after pouring, the surface of the casting is smooth, the gas evolution of the repairing paste is small, the pungent smell is small, and the repairing paste is environment-friendly. Moreover, the repair paste has the advantages of low raw material cost, simple preparation method, simple and convenient operation during repair and easy popularization. The repairing method for the lost foam by using the repairing paste is simple and convenient to operate, has good bonding performance with the lost foam, is short in repairing standing time, and has high practical value.
The present invention will be described in detail below by way of examples.
Example 1
The repair method of the lost foam comprises the following steps:
(1) blowing off dust at the defect part of the lost foam by using a blower, placing the lost foam on an operation table, and dipping absorbent cotton in acetone to clean the defect part of the lost foam;
(2) mixing polyvinyl butyral with the number average molecular weight of 30K and the milky white glue I type polyvinyl acetate emulsion to obtain a repairing paste; wherein, the polyvinyl butyral accounts for 75 percent by mass, and the milky white glue I type polyvinyl acetate emulsion accounts for 25 percent by mass;
(3) and coating the repair paste on the defect part, leveling and standing for 25 min.
Example 2
The repair method of the lost foam comprises the following steps:
(1) blowing off dust at the defect part of the lost foam by using a blower, placing the lost foam on an operation table, and dipping absorbent cotton in acetone to clean the defect part of the lost foam;
(2) mixing polyvinyl butyral with the number average molecular weight of 45K and the milky white glue I type polyvinyl acetate emulsion to obtain a repairing paste; wherein, the polyvinyl butyral accounts for 65 percent by mass, and the milky white glue I type polyvinyl acetate emulsion accounts for 35 percent by mass;
(3) and coating the repair paste on the defect part, leveling and standing for 20 min.
Example 3
The repair method of the lost foam comprises the following steps:
(1) blowing off dust at the defect part of the lost foam by using a blower, placing the lost foam on an operation table, and dipping absorbent cotton in acetone to clean the defect part of the lost foam;
(2) mixing polyvinyl butyral with the number average molecular weight of 30K and the milky white glue I type polyvinyl acetate emulsion to obtain a repairing paste; wherein, the polyvinyl butyral accounts for 80 percent by mass, and the milky white glue I type polyvinyl acetate emulsion accounts for 20 percent by mass;
(3) and coating the repair paste on the defect part, leveling and standing for 30 min.
The ZGCr25Ni20 molten steel is poured into the lost foam repaired by the application examples 1-3, and the defect that the casting is not marked after pouring, the surface of the casting is smooth, and the casting has no shrinkage porosity, air holes and other casting defects, thereby indicating that the repair paste has small gas evolution. In the casting process, the pungent smell is small, which shows that the repairing paste of the invention has small pungent smell and is relatively environment-friendly. As mentioned above, the repairing method for the lost foam by using the repairing paste is simple and convenient to operate, has good bonding performance with the lost foam, is short in repairing standing time and has high practical value.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (5)
1. The repair paste for the lost foam is characterized by consisting of polyvinyl butyral and polyvinyl acetate emulsion; wherein, the polyvinyl butyral accounts for 65 to 80 percent by weight percent.
2. The repair paste for lost foam according to claim 1, wherein the polyvinyl acetate emulsion is one or more of RF701 type super white latex, type I white latex, and type II white latex.
3. The repair paste for lost foam according to claim 1, wherein the polyvinyl butyral has a number average molecular weight of from 30k to 45 k.
4. The repair paste for a lost foam according to claim 1, wherein the polyvinyl butyral comprises 70% to 75% by mass.
5. A method for preparing a repair paste for a lost foam, comprising the step of mixing the polyvinyl butyral and the polyvinyl acetate emulsion according to the blending ratio of the polyvinyl butyral and the polyvinyl acetate emulsion of claim 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810863885.6A CN109014037B (en) | 2018-08-01 | 2018-08-01 | Repair paste for lost foam and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810863885.6A CN109014037B (en) | 2018-08-01 | 2018-08-01 | Repair paste for lost foam and preparation method thereof |
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| Publication Number | Publication Date |
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| CN109014037A CN109014037A (en) | 2018-12-18 |
| CN109014037B true CN109014037B (en) | 2020-06-16 |
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Citations (3)
| 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 |
| CN101497104A (en) * | 2009-03-11 | 2009-08-05 | 杨玉光 | Lost foam paint and method for producing the same |
| CN101642797A (en) * | 2009-09-01 | 2010-02-10 | 郑宝安 | Mending paste special for lost foam casting |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102942887B (en) * | 2012-11-22 | 2014-01-08 | 西安工程大学 | Foamed plastic binder for lost form casting and method for preparing binder |
| CN105537520A (en) * | 2016-01-19 | 2016-05-04 | 安徽涌畅铸件有限公司 | Production technology for casting lost foam |
-
2018
- 2018-08-01 CN CN201810863885.6A patent/CN109014037B/en active Active
Patent Citations (3)
| 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 |
| CN101497104A (en) * | 2009-03-11 | 2009-08-05 | 杨玉光 | Lost foam paint and method for producing the same |
| CN101642797A (en) * | 2009-09-01 | 2010-02-10 | 郑宝安 | Mending paste special for lost foam casting |
Non-Patent Citations (2)
| Title |
|---|
| "关于敦煌壁画保护方法的评价";徐毓明;《文物》;19821231;第70-74页 * |
| "消失模铸造泡塑模样的黏结操作技巧";袁东洲;《第十三届21省（市、区）4市铸造会议暨第七届安徽省铸造技术大会论文集》;20120701;第217-220页 * |
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