CN106734854A - A kind of method that compound resin prepares high temperature resistant cracking resistance precoated sand - Google Patents
A kind of method that compound resin prepares high temperature resistant cracking resistance precoated sand Download PDFInfo
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- CN106734854A CN106734854A CN201611265244.8A CN201611265244A CN106734854A CN 106734854 A CN106734854 A CN 106734854A CN 201611265244 A CN201611265244 A CN 201611265244A CN 106734854 A CN106734854 A CN 106734854A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
- B22C1/2233—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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Abstract
The invention discloses a kind of method that compound resin prepares high temperature resistant cracking resistance precoated sand, belong to precoated sand preparing technical field.The present invention is first by quartz sand,Mix with the slurries broken into by glutinous rice and water after the sieving of waste ceramic mix grinding,Freezed after wet ball grinding,Sieve to obtain dried powder,Then by formalin and phenol,Oxalic acid reacts to obtain phenolic resin,It is dissolved in absolute ethyl alcohol obtaining phenolic resin ethanol solution,Again by dried powder and land plaster,Dimethicone etc. pours into puddle mixer mixing,Add methenamine solution,The stirring reactions of epoxy resin E 51,And phenolic resin ethanol solution and dibromomethylbenzene glycidol ether is added dropwise carries out curing reaction,Room temperature is cooled to after solidification and sand is unloaded,Can obtain high temperature resistant cracking resistance precoated sand,Obtained precoated sand solidification effect of the invention is good,Intensity is high,And it is low with gas forming amount,Resistant to elevated temperatures excellent properties,Material degrees of coordination is preferable,It is not easily broken in casting,The production requirement of various complex precise casting can be met.
Description
Technical field
The invention discloses a kind of method that compound resin prepares high temperature resistant cracking resistance precoated sand, belong to precoated sand technology of preparing
Field.
Background technology
As the fast-developing and engineering goods foreign export of auto industry needs, and casting international market exploitation,
To casting quality requirement also more and more higher, such as cast(ing) surface and dimensional accuracy are improved, thin-section casting increases, internal defect in cast drop
Low etc., precoated sand refers to that one layer of molding sand or core sand of hard resin are covered with sand grain surface before moulding, due to precoated sand tool
Have the advantages that strong adaptability, intensity are high, gas forming amount is low, production casting dimension accuracy high, any surface finish, be easy to preserve, in recent years
Using increasingly extensive in the casting fields such as steel-casting, ironcasting.Simultaneously precoated sand application in the world, especially Japan,
Application in the country such as South Korea, Eastern Europe and China's Taiwan foundary industry is also developed rapidly therewith.
The main raw material(s) of precoated sand refers to roughing sand, resin, curing agent and additional materials, with good mobility and is deposited
Putting property, the performance of precoated sand is primarily referred to as three indexs such as room temperature tensile strength, hot tensile strength and crust performance.Cover at present
The production technology of film sand has cold method with plastic film, cold dry-mixed method with plastic film, half xeothermic method with plastic film and a hot method with plastic film, cold method with plastic film be by sand,
Other additives, powdered resin and methenamine, are well mixed in addition puddle mixer, are adding alcohol to blend together grume shape, shake out
Dry, crush, screening obtains precoated sand；Hot method overlay film is then the production technology of nowadays main use, and hot method overlay film is by silica sand
It is heated to more than 130 DEG C and is added in puddle mixer when silica sand cools to uniform temperature add resin, the methenamine aqueous solution, hard
Resin acid calcium and other additives.Precoated sand is obtained after broken, screening.However, prior art prepare precoated sand heat resistance compared with
Difference, easily ruptures in the more complicated casting of cast structure, especially more easily rupturable when thin-section casting is cast, material association
Scheduling is poor, is unfavorable for the popularization and application of precoated sand.
The content of the invention
Present invention mainly solves technical problem：It is poor for existing precoated sand heat resistance, it is more multiple in cast structure
Easily ruptured during miscellaneous casting, especially more easily rupturable, the poor defect of material degrees of coordination when thin-section casting is cast, there is provided
Compound resin cladding mixed sand surface after surface treatment, solidify to form and covers obtained in a kind of epoxy modified phenolic
The method of film sand, the present invention will first mix after quartz sand, the sieving of waste ceramic mix grinding with the slurries broken into by glutinous rice and water, through wet
Freezed after method ball milling, sieve to obtain dried powder, formalin and phenol, oxalic acid are then reacted into obtain phenolic resin, be dissolved in anhydrous
In ethanol phenolic resin ethanol solution, then dried powder and land plaster, dimethicone etc. poured into puddle mixer mix, then plus
Enter methenamine solution, epoxy resin E-51 stirring reactions, and phenolic resin ethanol solution and dibromomethylbenzene glycidol is added dropwise
Ether carries out curing reaction, and room temperature is cooled to after solidification and sand is unloaded, you can obtain high temperature resistant cracking resistance precoated sand, is covered obtained in the present invention
Film sand solidification effect is good, intensity is high, and with gas forming amount is low, resistant to elevated temperatures excellent properties, material degrees of coordination preferably, in casting
It is not easily broken during casting, the production requirement of various complex precise casting can be met.
In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention is：
（1）Weigh respectively 400~500g quartz sands, 3~5g diatomite, 4~6g carborundum, 8~10g polyster fibres and 50~
60g waste ceramics, add and 300~320 mesh sieves are crossed after 2~4h of ball milling in ball mill, obtain mixed-powder, then to weigh 50~100g glutinous
Rice be added in 800~1000g water, after mixing move into beater in, with 18000~20000r/min rotating speeds mashing 15~
20min, crosses 200~240 mesh after mashing, obtain slurries, in mass ratio 1:5 will carry out wet ball grinding after mixed-powder and slurries mixing
40~60min, is discharged after ball milling, and 200~220 mesh sieves are crossed after freeze-drying, obtains dried powder, standby；
（2）During 80~100g mass fractions are weighed respectively for 37% formalin and 120~150g phenol addition four-hole boiling flask, with
1~3g oxalic acid is added afterwards, and 90~110 DEG C will be warming up to during four-hole boiling flask moves into oil bath pan after mixing, 2~3h of stirring reaction, instead
70~80 DEG C, in mass ratio 1 are cooled to after should terminating:4 mix the material in four-hole boiling flask and absolute ethyl alcohol, and stirring mixing is equal
Phenolic resin ethanol solution is obtained after even, it is standby；
（3）300~400g steps are weighed respectively（1）Standby dried powder, 5~15g land plasters, 1~3g silane couplers KH-
550th, 10~15g dimethicones, are added sequentially in puddle mixer, with 1000~2000r/min after being heated to 150~200 DEG C
Rotating speed stirring 20~30min of mixing, is cooled to 100~110 DEG C after mixing, add 10~15g, 20% methenamines of mass fraction molten
Liquid, continues to stir 1~2h of mixing；
（4）To 100~200g epoxy resin E-51 are added in the puddle mixer after above-mentioned stirring, carried out with 3000~5000r/min
Stirring, 80~100g steps are added dropwise while stirring（2）Standby phenolic resin ethanol solution, control is dripped off in 1~2h, is dripped
Plus 2~4g dibromomethylbenzene glycidol ethers are added after terminating, with 1000~2000r/min rotating speeds stirring 30~50min of mixing, stir
Room temperature is cooled to after mixing, sand is unloaded, you can high temperature resistant cracking resistance precoated sand is obtained.
Application process of the invention is：The obtained high temperature resistant cracking resistance precoated sand of 30~50kg present invention is poured into first is waved
In the sand hopper of formula shell core machine, and sand-spraying hole and core mould are entered into sand hole position alignment, core mould is then preheated to 200~
300 DEG C, then precoated sand of the present invention is injected in core mould, control shooting pressure for 0.2~0.4MPa, shooting time is typically controlled
System is 6~10mm in 3~10s, precoated sand thickness of the shell, precoated sand is closely filled core box, after penetrating sand and terminating, stands crust
Treatment, investing time is 20~60s, after the crust stage terminates, core mould is penetrated into sand mouth down, with the amplitude of 45° angle
Vacillate now to the left, now to the right, outwell the remaining sand not crusted, then the core in core mould is stood, 80~100s of cure process, while control
Mold temperature is 260~300 DEG C, is stood after last end to be hardened and is cooled to room temperature, and core is taken out in the demoulding.After testing,
Obtained high temperature resistant cracking resistance precoated sand gas forming amount of the invention is low, resistance to elevated temperatures is preferable, and its gas forming amount is 3.6~4.3mL/g, often
Warm tensile strength is 7~9MPa, and hot tensile strength is 2.8~3.6MPa, and high temperature resistant temperature is up to more than 200 DEG C, heat-resistant time
More than 220s is extended to, and with preferable material degrees of coordination, in the more complicated casting of cast structure, rupture rate is only 1
~3%.
The beneficial effects of the invention are as follows：
（1）Heat resisting film-coating sand of the invention obtained has that gas forming amount is low, calorific intensity is big, heat-resistant time is long and high temperature deformation is small
Feature, can meet the production requirement of various complex precise casting；
（2）Obtained high temperature resistant cracking resistance precoated sand hardening rate of the invention is high, and casting good forming effect, quality are high, and casting is strong
Degree is high, rupture rate is low, with preferable prospect of the application.
Specific embodiment
Weigh respectively first 400~500g quartz sands, 3~5g diatomite, 4~6g carborundum, 8~10g polyster fibres and
50~60g waste ceramics, add and 300~320 mesh sieves are crossed after 2~4h of ball milling in ball mill, obtain mixed-powder, then weigh 50~
100g glutinous rice is added in 800~1000g water, is moved into after mixing in beater, and 15 are beaten with 18000~20000r/min rotating speeds
~20min, crosses 200~240 mesh after mashing, obtain slurries, in mass ratio 1:5 will carry out wet method ball after mixed-powder and slurries mixing
40~60min of mill, is discharged after ball milling, and 200~220 mesh sieves are crossed after freeze-drying, obtains dried powder, standby；Then weigh respectively
80~100g mass fractions are added in four-hole boiling flask for 37% formalin and 120~150g phenol, are subsequently added 1~3g oxalic acid,
By in four-hole boiling flask immigration oil bath pan after mixing, 90~110 DEG C are warming up to, 2~3h of stirring reaction, reaction is cooled to 70 after terminating
~80 DEG C, in mass ratio 1:4 mix the material in four-hole boiling flask and absolute ethyl alcohol, and phenolic resin second is obtained after being uniformly mixed
Alcoholic solution, it is standby；Weigh the above-mentioned standby dried powders of 300~400g, 5~15g land plasters, 1~3g respectively again silane coupled
Agent KH-550,10~15g dimethicones, are added sequentially in puddle mixer, be heated to after 150~200 DEG C with 1000~
2000r/min rotating speeds stirring 20~30min of mixing, is cooled to 100~110 DEG C after mixing, add 10~15g mass fractions 20%
Methenamine solution, continues to stir 1~2h of mixing；Finally to addition 100~200g asphalt mixtures modified by epoxy resin in the puddle mixer after above-mentioned stirring
Fat E-51, is stirred with 3000~5000r/min, and the above-mentioned standby phenolic resin second of 80~100g is added dropwise while stirring
Alcoholic solution, control is dripped off in 1~2h, 2~4g dibromomethylbenzene glycidol ethers is added after completion of dropwise addition, with 1000~2000r/
Min rotating speeds stirring 30~50min of mixing, is cooled to room temperature after stirring, unload sand, you can obtain high temperature resistant cracking resistance precoated sand.
Example 1
Weigh 400g quartz sands, 3g diatomite, 4g carborundum, 8g polyster fibres and 50g waste ceramics respectively first, add ball milling
300 mesh sieves are crossed in machine after ball milling 2h, mixed-powder is obtained, then is weighed 50g glutinous rice and be added in 800g water, beater is moved into after mixing
In, 15min is beaten with 18000r/min rotating speeds, 200 mesh are crossed after mashing, obtain slurries, in mass ratio 1:5 by mixed-powder and slurries
Wet ball grinding 40min is carried out after mixing, is discharged after ball milling, 200 mesh sieves are crossed after freeze-drying, obtain dried powder, it is standby；Then divide
During another name takes 80g mass fractions for 37% formalin and 120g phenol addition four-hole boiling flask, 1g oxalic acid is subsequently added, after mixing
By in four-hole boiling flask immigration oil bath pan, 90 DEG C are warming up to, stirring reaction 2h, reaction is cooled to 70 DEG C, in mass ratio 1 after terminating:4
Material in four-hole boiling flask and absolute ethyl alcohol are mixed, phenolic resin ethanol solution is obtained after being uniformly mixed, it is standby；Distinguish again
The above-mentioned standby dried powders of 300g, 5g land plasters, 1g silane resin acceptor kh-550s, 10g dimethicones are weighed, is sequentially added
To in puddle mixer, it is heated to after 150 DEG C, with 1000r/min rotating speeds stirring mixing 20min, 100 DEG C being cooled to after mixing, adds
The methenamine solution of 10g mass fractions 20%, continues to stir mixing 1h；It is last to adding 100g in the puddle mixer after above-mentioned stirring
Epoxy resin E-51, is stirred with 3000r/min, and it is molten that the above-mentioned standby phenolic resin ethanol of 80g is added dropwise while stirring
Liquid, control is dripped off in 1h, and 2g dibromomethylbenzene glycidol ethers are added after completion of dropwise addition, is stirred with 1000r/min rotating speeds and mixed
30min, is cooled to room temperature after stirring, unload sand, you can obtain high temperature resistant cracking resistance precoated sand.
This example operation is easy, when using, pours into the obtained high temperature resistant cracking resistance precoated sand of the 30kg present invention wave first
In the sand hopper of formula shell core machine, and sand-spraying hole and core mould are entered into sand hole position alignment, core mould is then preheated to 200
DEG C, then will precoated sand of the present invention inject core mould in, control shooting pressure be 0.2MPa, shooting time general control in 3s,
Precoated sand thickness of the shell is 6mm, precoated sand is closely filled core box, after penetrating sand and terminating, stands crust treatment, and investing time is
20s, after the crust stage terminates, sand mouth down is penetrated by core mould, is vacillated now to the left, now to the right with the amplitude of 45° angle, is outwelled and is not crusted
Remaining sand, then the core in core mould is stood, cure process 80s, while control mold temperature for 260 DEG C, finally treat firmly
Change stands after terminating and is cooled to room temperature, and core is taken out in the demoulding.After testing, the obtained high temperature resistant cracking resistance precoated sand hair of the present invention
Tolerance is low, resistance to elevated temperatures is preferable, and its gas forming amount is 3.6mL/g, and room temperature tensile strength is 7MPa, and hot tensile strength is
2.8MPa, up to 205 DEG C, heat-resistant time extends to 225s to high temperature resistant temperature, and with preferable material degrees of coordination, in cast structure
During more complicated casting, rupture rate is only 1%.
Example 2
Weigh 450g quartz sands, 4g diatomite, 5g carborundum, 9g polyster fibres and 55g waste ceramics respectively first, add ball milling
310 mesh sieves are crossed in machine after ball milling 3h, mixed-powder is obtained, then is weighed 75g glutinous rice and be added in 900g water, beater is moved into after mixing
In, 18min is beaten with 19000r/min rotating speeds, 220 mesh are crossed after mashing, obtain slurries, in mass ratio 1:5 by mixed-powder and slurries
Wet ball grinding 50min is carried out after mixing, is discharged after ball milling, 210 mesh sieves are crossed after freeze-drying, obtain dried powder, it is standby；Then divide
During another name takes 90g mass fractions for 37% formalin and 135g phenol addition four-hole boiling flask, 2g oxalic acid is subsequently added, after mixing
By in four-hole boiling flask immigration oil bath pan, 100 DEG C are warming up to, stirring reaction 2h, reaction is cooled to 75 DEG C, in mass ratio 1 after terminating:
4 mix the material in four-hole boiling flask and absolute ethyl alcohol, and phenolic resin ethanol solution is obtained after being uniformly mixed, standby；Divide again
Another name takes the above-mentioned standby dried powders of 350g, 10g land plasters, 2g silane resin acceptor kh-550s, 13g dimethicones, successively
It is added in puddle mixer, is heated to after 175 DEG C, with 1500r/min rotating speeds stirring mixing 25min, being cooled to 105 DEG C after mixing, plus
Enter the methenamine solution of 13g mass fractions 20%, continue to stir mixing 1h；It is last to be added in the puddle mixer after above-mentioned stirring
150g epoxy resin E-51, are stirred with 4000r/min, and the above-mentioned standby phenolic resin second of 90g is added dropwise while stirring
Alcoholic solution, control is dripped off in 1h, and 3g dibromomethylbenzene glycidol ethers are added after completion of dropwise addition, mixed with the stirring of 1500r/min rotating speeds
40min is closed, room temperature is cooled to after stirring, unload sand, you can obtain high temperature resistant cracking resistance precoated sand.
This example operation is easy, when using, pours into the obtained high temperature resistant cracking resistance precoated sand of the 40kg present invention wave first
In the sand hopper of formula shell core machine, and sand-spraying hole and core mould are entered into sand hole position alignment, core mould is then preheated to 250
DEG C, then will precoated sand of the present invention inject core mould in, control shooting pressure be 0.3MPa, shooting time general control in 7s,
Precoated sand thickness of the shell is 8mm, precoated sand is closely filled core box, after penetrating sand and terminating, stands crust treatment, and investing time is
40s, after the crust stage terminates, sand mouth down is penetrated by core mould, is vacillated now to the left, now to the right with the amplitude of 45° angle, is outwelled and is not crusted
Remaining sand, then the core in core mould is stood, cure process 90s, while control mold temperature for 280 DEG C, finally treat firmly
Change stands after terminating and is cooled to room temperature, and core is taken out in the demoulding.After testing, the obtained high temperature resistant cracking resistance precoated sand hair of the present invention
Tolerance is low, resistance to elevated temperatures is preferable, and its gas forming amount is 3.9mL/g, and room temperature tensile strength is 8MPa, and hot tensile strength is
3.2MPa, up to 210 DEG C, heat-resistant time extends to 230s to high temperature resistant temperature, and with preferable material degrees of coordination, in cast structure
During more complicated casting, rupture rate is only 2%.
Example 3
Weigh 500g quartz sands, 5g diatomite, 6g carborundum, 10g polyster fibres and 60g waste ceramics respectively first, add ball
320 mesh sieves are crossed in grinding machine after ball milling 4h, mixed-powder is obtained, then is weighed 100g glutinous rice and be added in 1000g water, moved into after mixing and beaten
In pulp grinder, 20min is beaten with 20000r/min rotating speeds, 240 mesh are crossed after mashing, obtain slurries, in mass ratio 1:5 by mixed-powder and
Wet ball grinding 60min is carried out after slurries mixing, is discharged after ball milling, 220 mesh sieves are crossed after freeze-drying, obtain dried powder, it is standby；With
During 100g mass fractions are weighed respectively afterwards for 37% formalin and 150g phenol addition four-hole boiling flask, 3g oxalic acid is subsequently added, mixed
By in four-hole boiling flask immigration oil bath pan after conjunction, 110 DEG C are warming up to, stirring reaction 3h, reaction is cooled to 80 DEG C after terminating, by quality
Than 1:4 mix the material in four-hole boiling flask and absolute ethyl alcohol, and phenolic resin ethanol solution is obtained after being uniformly mixed, standby；
Weigh the above-mentioned standby dried powders of 400g, 15g land plasters, 3g silane resin acceptor kh-550s, 15g dimethicones respectively again,
It is added sequentially in puddle mixer, is heated to after 200 DEG C, with 2000r/min rotating speeds stirring mixing 30min, 110 being cooled to after mixing
DEG C, the methenamine solution of 15g mass fractions 20% is added, continue to stir mixing 2h；It is last to add in the puddle mixer after above-mentioned stirring
Enter 200g epoxy resin E-51, be stirred with 5000r/min, the above-mentioned standby phenolic resin of 100g is added dropwise while stirring
Ethanol solution, control is dripped off in 2h, and 4g dibromomethylbenzene glycidol ethers are added after completion of dropwise addition, is stirred with 2000r/min rotating speeds
Mixing 50min, is cooled to room temperature after stirring, unload sand, you can obtain high temperature resistant cracking resistance precoated sand.
This example operation is easy, when using, pours into the obtained high temperature resistant cracking resistance precoated sand of the 50kg present invention wave first
In the sand hopper of formula shell core machine, and sand-spraying hole and core mould are entered into sand hole position alignment, core mould is then preheated to 300
DEG C, then will precoated sand of the present invention inject core mould in, control shooting pressure be 0.4MPa, shooting time general control in 10s,
Precoated sand thickness of the shell is 10mm, precoated sand is closely filled core box, after penetrating sand and terminating, stands crust treatment, investing time
It is 60s, after the crust stage terminates, core mould is penetrated into sand mouth down, vacillated now to the left, now to the right with the amplitude of 45° angle, outwells and do not tie
The remaining sand of shell, then the core in core mould is stood, cure process 100s, while controlling mold temperature for 300 DEG C, finally treat
Hardening stands after terminating and is cooled to room temperature, and core is taken out in the demoulding.After testing, the obtained high temperature resistant cracking resistance precoated sand of the present invention
Gas forming amount is low, resistance to elevated temperatures is preferable, and its gas forming amount is 4.3mL/g, and room temperature tensile strength is 9MPa, and hot tensile strength is
3.6MPa, up to 215 DEG C, heat-resistant time extends to 235s to high temperature resistant temperature, and with preferable material degrees of coordination, in cast structure
During more complicated casting, rupture rate is only 3%.
Claims (1)
1. a kind of method that compound resin prepares high temperature resistant cracking resistance precoated sand, it is characterised in that specifically preparation process is：
（1）Weigh respectively 400~500g quartz sands, 3~5g diatomite, 4~6g carborundum, 8~10g polyster fibres and 50~
60g waste ceramics, add and 300~320 mesh sieves are crossed after 2~4h of ball milling in ball mill, obtain mixed-powder, then to weigh 50~100g glutinous
Rice be added in 800~1000g water, after mixing move into beater in, with 18000~20000r/min rotating speeds mashing 15~
20min, crosses 200~240 mesh after mashing, obtain slurries, in mass ratio 1:5 will carry out wet ball grinding after mixed-powder and slurries mixing
40~60min, is discharged after ball milling, and 200~220 mesh sieves are crossed after freeze-drying, obtains dried powder, standby；
（2）During 80~100g mass fractions are weighed respectively for 37% formalin and 120~150g phenol addition four-hole boiling flask, with
1~3g oxalic acid is added afterwards, and 90~110 DEG C will be warming up to during four-hole boiling flask moves into oil bath pan after mixing, 2~3h of stirring reaction, instead
70~80 DEG C, in mass ratio 1 are cooled to after should terminating:4 mix the material in four-hole boiling flask and absolute ethyl alcohol, and stirring mixing is equal
Phenolic resin ethanol solution is obtained after even, it is standby；
（3）300~400g steps are weighed respectively（1）Standby dried powder, 5~15g land plasters, 1~3g silane couplers KH-
550th, 10~15g dimethicones, are added sequentially in puddle mixer, with 1000~2000r/min after being heated to 150~200 DEG C
Rotating speed stirring 20~30min of mixing, is cooled to 100~110 DEG C after mixing, add 10~15g, 20% methenamines of mass fraction molten
Liquid, continues to stir 1~2h of mixing；
（4）To 100~200g epoxy resin E-51 are added in the puddle mixer after above-mentioned stirring, carried out with 3000~5000r/min
Stirring, 80~100g steps are added dropwise while stirring（2）Standby phenolic resin ethanol solution, control is dripped off in 1~2h, is dripped
Plus 2~4g dibromomethylbenzene glycidol ethers are added after terminating, with 1000~2000r/min rotating speeds stirring 30~50min of mixing, stir
Room temperature is cooled to after mixing, sand is unloaded, you can high temperature resistant cracking resistance precoated sand is obtained.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107214292A (en) * | 2017-06-28 | 2017-09-29 | 安徽华飞机械铸锻有限公司 | A kind of moulding sand for casting and preparation method thereof |
| CN111690399A (en) * | 2020-04-27 | 2020-09-22 | 北京大德广源石油技术服务有限公司 | Sand control agent for fracturing and use method thereof |
| CN112139442A (en) * | 2020-09-23 | 2020-12-29 | 济南市平阴县玛钢厂 | Preparation process and compression molding system of high-performance precoated sand for complex castings |
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| CN111690399A (en) * | 2020-04-27 | 2020-09-22 | 北京大德广源石油技术服务有限公司 | Sand control agent for fracturing and use method thereof |
| CN111690399B (en) * | 2020-04-27 | 2021-09-07 | 北京大德广源石油技术服务有限公司 | Sand control agent for fracturing and use method thereof |
| CN112139442A (en) * | 2020-09-23 | 2020-12-29 | 济南市平阴县玛钢厂 | Preparation process and compression molding system of high-performance precoated sand for complex castings |
| CN112139442B (en) * | 2020-09-23 | 2021-09-24 | 济南市平阴县玛钢厂 | Preparation process and compression molding system of high-performance precoated sand for complex castings |
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