CN110819125A - Low-temperature mold material for precision casting mold and preparation method thereof - Google Patents
Low-temperature mold material for precision casting mold and preparation method thereof Download PDFInfo
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- CN110819125A CN110819125A CN201810914670.2A CN201810914670A CN110819125A CN 110819125 A CN110819125 A CN 110819125A CN 201810914670 A CN201810914670 A CN 201810914670A CN 110819125 A CN110819125 A CN 110819125A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
- C08L91/06—Waxes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention belongs to the technical field of precision casting, and particularly relates to a low-temperature mould material for a precision casting mould and a preparation method thereof.
Description
Technical Field
The invention belongs to the technical field of precision casting, and particularly relates to a low-temperature mold material for a precision casting mold and a preparation method thereof.
Background
With the development of society, precision castings have been widely used in the aviation, weapon, and other industrial sectors, particularly in electronics, petroleum, chemical, transportation, light industry, textile, pharmaceutical, medical, pump, and valve components.
The mould material commonly used at present is two or three of sodium dodecyl benzene sulfonate, ozokerite and triethanolamine, and has good plasticity and filling property, but the mould material has poor thermal stability, low strength, high ash content, unfixed demoulding time, generates a large amount of waste products, has low mould material quality and high cost, seriously influences the improvement of casting quality, has small competitiveness in the international market of the produced casting, and cannot meet the requirement of the precision casting industry.
However, many investment casting enterprises in China want to produce castings for export, and the quality of the castings is required to be improved for export. Therefore, advanced investment casting equipment and high quality mold material are required in the production process.
Disclosure of Invention
The invention aims to solve the problems and provides a low-temperature mould material for a precision casting mould and a preparation method thereof.
The invention is realized by adopting the following technical scheme:
the low-temperature die material for the precision casting die comprises, by mass, 44-46 parts of montan wax, 2.5-3.5 parts of triethanolamine, 34-36 parts of α -olefin polymer, 3.5-4.5 parts of ethylene-vinyl acetate copolymer and 12-14 parts of ozokerite.
The invention also provides a method for preparing the low-temperature die material for the precision casting die, which comprises the following steps:
(1) heating α -olefin polymer at 120 ℃, and continuously stirring until the polymer is molten to obtain molten α -olefin polymer A;
(2) continuously heating the melted α -olefin polymer A obtained in the step (1) at 100-120 ℃, adding triethanolamine, and continuously stirring until the triethanolamine is completely melted to obtain a mixture B;
(3) continuously heating the mixture B obtained in the step (2) at 110-120 ℃, adding an ethylene-vinyl acetate copolymer, and continuously stirring until the mixture is completely molten to obtain a mixture C;
(4) continuously heating the mixture C obtained in the step (3) at 120 ℃, adding ozokerite, and continuously stirring until the mixture C is completely melted to obtain a mixture D;
(5) continuously heating the mixture D obtained in the step (4) at 110-120 ℃, and continuously stirring;
(6) reducing the temperature of the mixture D processed in the step (5) to 100 ℃, continuing heating and stirring, adding montan wax at the temperature of 90-100 ℃, and heating and stirring until the montan wax is molten to obtain a mixture E;
(7) and (4) continuously stirring and heating the mixture E obtained in the step (6), cooling to 80-90 ℃ and preparing into particles to obtain the low-temperature die material for the precision casting die.
Further, in the step (2), the step (3) and the step (4), the heating time is 1-2 minutes.
Further, the heating time in the step (5) and the heating time in the step (7) are both 3-4 hours.
Further, the heating time in the step (6) is 30-60 minutes.
The invention has the beneficial effects that:
1. the linear shrinkage rate and the sinking rate are low, so that the product has strong dimensional stability;
2. the penetration is within the range of 5-6 dmm, so that the product has high strength;
3. the gray level is low, so that the surface smoothness of the casting is good, the metal cannot be polluted, and the casting quality is high;
4. the softening point and the dropping point are in the ideal range, so that the die is easy to be removed in the casting process, and the production efficiency is higher.
Detailed Description
The technical solutions in the examples will be clearly and completely described below. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Example 1
Weighing 44 parts of montan wax, 2.5 parts of triethanolamine, 34 parts of α -olefin polymer, 3.5 parts of ethylene-vinyl acetate copolymer and 12 parts of ozokerite by weight, and preparing the low-temperature mould material for the precision casting mould according to the following steps:
(1) heating α -olefin polymer at 120 ℃, and continuously stirring until the polymer is molten to obtain molten α -olefin polymer A;
(2) continuously heating the melted α -olefin polymer A obtained in the step (1) at 100 ℃ for 1 minute, adding triethanolamine, and continuously stirring until the triethanolamine is completely melted to obtain a mixture B;
(3) continuously heating the mixture B obtained in the step (2) at 110 ℃ for 1 minute, adding ethylene-vinyl acetate copolymer, and continuously stirring until the mixture is completely molten to obtain a mixture C;
(4) continuously heating the mixture C obtained in the step (3) at 120 ℃ for 1 minute, adding ozokerite, and continuously stirring until the mixture C is completely melted to obtain a mixture D;
(5) continuously heating the mixture D obtained in the step (4) at 110 ℃, and continuously stirring for 3 hours;
(6) reducing the temperature of the mixture D processed in the step (5) to 100 ℃, continuing heating and stirring for 30 minutes, adding montan wax at 90 ℃, and heating and stirring until the montan wax is molten to obtain a mixture E;
(7) and (4) continuously stirring and heating the mixture E obtained in the step (6) for 3 hours, cooling to 80 ℃, and granulating to obtain the low-temperature die material for the precision casting die.
Example 2
Weighing 46 parts of montan wax, 3.5 parts of triethanolamine, 36 parts of α -olefin polymer, 4.5 parts of ethylene-vinyl acetate copolymer and 14 parts of ozokerite by weight, and preparing the low-temperature mould material for the precision casting mould according to the following steps:
(1) heating α -olefin polymer at 120 ℃, and continuously stirring until the polymer is molten to obtain molten α -olefin polymer A;
(2) continuously heating the melted α -olefin polymer A obtained in the step (1) at 120 ℃ for 2 minutes, adding triethanolamine, and continuously stirring until the triethanolamine is completely melted to obtain a mixture B;
(3) continuously heating the mixture B obtained in the step (2) at 120 ℃ for 2 minutes, adding ethylene-vinyl acetate copolymer, and continuously stirring until the mixture is completely molten to obtain a mixture C;
(4) continuously heating the mixture C obtained in the step (3) at 120 ℃ for 2 minutes, adding ozokerite, and continuously stirring until the mixture C is completely melted to obtain a mixture D;
(5) continuously heating the mixture D obtained in the step (4) at 120 ℃, and continuously stirring for 4 hours;
(6) reducing the temperature of the mixture D processed in the step (5) to 100 ℃, continuing heating and stirring for 60 minutes, adding montan wax at the temperature of 100 ℃, and heating and stirring until the montan wax is molten to obtain a mixture E;
(7) and (4) continuously stirring and heating the mixture E obtained in the step (6) for 4 hours, cooling to 90 ℃ and preparing into particles to obtain the low-temperature die material for the precision casting die.
Example 3
Weighing 45 parts of montan wax, 3 parts of triethanolamine, 35 parts of α -olefin polymer, 4 parts of ethylene-vinyl acetate copolymer and 13 parts of ozokerite by weight, and preparing the low-temperature mould material for the precision casting mould according to the following steps:
(1) heating α -olefin polymer at 120 ℃, and continuously stirring until the polymer is molten to obtain molten α -olefin polymer A;
(2) continuously heating the melted α -olefin polymer A obtained in the step (1) at 110 ℃ for 1.5 minutes, adding triethanolamine, and continuously stirring until the mixture is completely melted to obtain a mixture B;
(3) continuously heating the mixture B obtained in the step (2) at 115 ℃ for 1.5 minutes, adding ethylene-vinyl acetate copolymer, and continuously stirring until the mixture is completely molten to obtain a mixture C;
(4) continuously heating the mixture C obtained in the step (3) at 120 ℃ for 1.5 minutes, adding ozokerite, and continuously stirring until the mixture C is completely molten to obtain a mixture D;
(5) continuously heating the mixture D obtained in the step (4) at 115 ℃, and continuously stirring for 3.5 hours;
(6) reducing the temperature of the mixture D processed in the step (5) to 100 ℃, continuing heating and stirring for 45 minutes, adding montan wax at the temperature of 95 ℃, and heating and stirring until the montan wax is molten to obtain a mixture E;
(7) and (4) continuously stirring and heating the mixture E obtained in the step (6) for 3-4 hours, cooling to 85 ℃, and preparing into particles to obtain the low-temperature die material for the precision casting die.
In this example, the montan wax and the α -olefin polymer were blended in the above-mentioned amounts by mass, which contributes to improving the strength and stability of the casting wax, and further, improving the precision and production efficiency of the casting.
Comparative example
The low-temperature mold materials for precision casting molds prepared in examples 1, 2 and 3 of the present invention were respectively used to measure various technical indexes, and three common low-temperature mold materials for precision casting molds were used to perform the above technical index measurements, and the obtained experimental data are shown in table 1:
table 1: the detection results of the low-temperature die material for the precision casting die and the low-temperature die material for the common precision casting die prepared by the embodiment of the invention
| Detecting items | Penetration/ddm | Softening point/. degree.C | Ash content | Shrinkage rate |
| Example 1 | 5.3 | 58 | 0.011 | 0.84 |
| Example 2 | 5.2 | 55 | 0.009 | 0.81 |
| Example 3 | 5.4 | 56 | 0.010 | 0.85 |
| Common mould material | 7.9 | 60 | 0.044 | 0.97 |
As can be seen from the detection results in Table 1, the low-temperature die material for the precision casting die manufactured according to the invention has the cone penetration always kept within the range of 5-6 dmm, so that the low-temperature die material for the precision casting die has high strength; the softening point and the dropping point are kept within the range of 50-60 ℃, so that the easy demoulding in the casting process is ensured; the ash content is low, so that the surface smoothness of the casting is good, the metal cannot be polluted, and the casting quality is high; the shrinkage rate is kept at a low value, and the product has good dimensional stability.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (5)
1. The low-temperature mould material for the precision casting mould is characterized by comprising, by mass, 44-46 parts of montan wax, 2.5-3.5 parts of triethanolamine, 34-36 parts of α -olefin polymer, 3.5-4.5 parts of ethylene-vinyl acetate copolymer and 12-14 parts of ozokerite.
2. A method for preparing a low-temperature molding material for precision casting molds according to claim 1, comprising the steps of:
(1) heating α -olefin polymer at 120 ℃, and continuously stirring until the polymer is molten to obtain molten α -olefin polymer A;
(2) continuously heating the melted α -olefin polymer A obtained in the step (1) at 100-120 ℃, adding triethanolamine, and continuously stirring until the triethanolamine is completely melted to obtain a mixture B;
(3) continuously heating the mixture B obtained in the step (2) at 110-120 ℃, adding an ethylene-vinyl acetate copolymer, and continuously stirring until the mixture is completely molten to obtain a mixture C;
(4) continuously heating the mixture C obtained in the step (3) at 120 ℃, adding ozokerite, and continuously stirring until the mixture C is completely melted to obtain a mixture D;
(5) continuously heating the mixture D obtained in the step (4) at 110-120 ℃, and continuously stirring;
(6) reducing the temperature of the mixture D processed in the step (5) to 100 ℃, continuing heating and stirring, adding montan wax at the temperature of 90-100 ℃, and heating and stirring until the montan wax is molten to obtain a mixture E;
(7) and (4) continuously stirring and heating the mixture E obtained in the step (6), cooling to 80-90 ℃ and preparing into particles to obtain the low-temperature die material for the precision casting die.
3. The method for preparing a low-temperature mold material for a precision casting mold according to claim 2, wherein the heating time in the step (2), the step (3) and the step (4) is 1 to 2 minutes.
4. The method for preparing a low-temperature mold material for a precision casting mold according to claim 2, wherein the heating time in the step (5) and the heating time in the step (7) are both 3 to 4 hours.
5. The method for preparing a low-temperature mold material for a precision casting mold according to claim 2, wherein the heating time in the step (6) is 30 to 60 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810914670.2A CN110819125A (en) | 2018-08-13 | 2018-08-13 | Low-temperature mold material for precision casting mold and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810914670.2A CN110819125A (en) | 2018-08-13 | 2018-08-13 | Low-temperature mold material for precision casting mold and preparation method thereof |
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| Publication Number | Publication Date |
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| CN110819125A true CN110819125A (en) | 2020-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810914670.2A Withdrawn CN110819125A (en) | 2018-08-13 | 2018-08-13 | Low-temperature mold material for precision casting mold and preparation method thereof |
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| CN (1) | CN110819125A (en) |
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- 2018-08-13 CN CN201810914670.2A patent/CN110819125A/en not_active Withdrawn
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Application publication date: 20200221 |