CN110303116A - A kind of overlay film sand shell mould coating and preparation method thereof - Google Patents
A kind of overlay film sand shell mould coating and preparation method thereof Download PDFInfo
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- CN110303116A CN110303116A CN201910737107.7A CN201910737107A CN110303116A CN 110303116 A CN110303116 A CN 110303116A CN 201910737107 A CN201910737107 A CN 201910737107A CN 110303116 A CN110303116 A CN 110303116A
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Abstract
The invention discloses a kind of overlay film sand shell mould coating and preparation method thereof, belong to technical field of paint preparation；A kind of overlay film sand shell mould coating, specifically includes consisting of ingredient: water, silica solution, sodium carboxymethylcellulose, silica flour, bentonite；A kind of preparation method of overlay film sand shell mould coating, specifically includes the following steps: prepared by raw material；Weigh base fluid；It weighs silica solution to be put into the second mixing tank, and water is added, be sufficiently stirred；Sodium carboxymethylcellulose is weighed to pour into the first mixing tank；It weighs silica flour and pours into stirring in blender, then weigh bentonite and pour into blender；Mixed liquor after stirring is poured into storage vat；Weighing, storage；Coating suspension performance in the present invention using sodium carboxymethylcellulose production is higher, rate of deposition is low, and in process, it can reduce the generation rate of pockmark, bubble on casting after producing using the coating that this method makes, and the scab rate of cast(ing) surface can be effectively reduced, effectively reduce production cost.
Description
Technical field
The present invention relates to technology for producing coating fields more particularly to a kind of overlay film sand shell mould coating and preparation method thereof.
Background technique
Precoated sand is the molding sand or core sand that sand grain surface is covered with one layer of hard resin film before moulding, is had in the prior art
Both two kinds of coating techniques of cold process and thermal method: cold process is dissolved resin with ethyl alcohol, and methenamine is added during mulling, make
It is coated on sand grain surface, ethyl alcohol volatilization obtains precoated sand；Sand is preheating to certain temperature by thermal method, and resin is added to make its melting, and stirring makes
Resin is coated on sand grain surface, adds methenamine aqueous solution and lubricant, cooling, broken, sieve to obtain precoated sand, is used for cast steel
Part, ironcasting.
Overlay film sand technique is to be blended by aggregate by high-temperature stirring in the prior art, then by foundry's core shooter handle
Overlay film sand is injected after hyperbar to be warmed in the various casting type chambers of certain temperature, by the solidification of some cycles,
Crust, then separates casting die through core shooting cylinder or oil cylinder, and the formwork for reaching intensity is taken out, natural using 12 hours
Solidification reaches some strength, smelting workshop casting.
But because cast article is all kinds of, casting heat energy-saving position thin and thick is different, does by overlay film sand technique in the prior art
Product surface out generates many subcutaneous blowholes after processing there are many irregular pockmark, part cast member, and in the prior art
It is viscous husky more serious, and then may cause casting and scrap and soldering, polishing repeatedly, cause that the production cost increases, and the prior art
In coating will generate precipitating after preparation is completed 8 hours, influence the normal use of coating, reduce production efficiency, and show
There is the solvent of solution in technology especially heavy using ethyl alcohol, higher cost, and then a kind of overlay film sand shell mould coating and preparation method thereof
It wants.
Summary of the invention
The purpose of the present invention is to solve the problems of the prior art, and a kind of overlay film sand shell mould coating that proposes and its
Preparation method.
To achieve the goals above, present invention employs following technical solutions:
A kind of overlay film sand shell mould coating, specifically includes consisting of ingredient: water, silica solution, sodium carboxymethylcellulose, silica flour,
Bentonite.
Preferably, the constituent is following parts by weight:
Water: 12-13 parts；
Silica solution: 2-3 parts；
Sodium carboxymethylcellulose: 0.1-0.2 parts；
Silica flour: 10-30 parts；
Bentonite: 1.5-1.7 parts.
A kind of preparation method of overlay film sand shell mould coating, specifically includes the following steps:
P1, raw material preparation: raw materials of silica sol, quartzy powder raw material, bentonite material, sodium carboxymethylcellulose raw material are prepared；
P2, it weighs base fluid: weighing 2-3kg water and be put into the first mixing tank；
P3, it weighs 2-3kg silica solution and is put into the second mixing tank, and 5-15kg water is added, be sufficiently stirred；
P4, the silica solution mixed liquor in the second mixing tank is poured into the first mixing tank；
P5, weigh sodium carboxymethylcellulose 0.1-0.2kg and pour into the first mixing tank, and during pouring into using stirring rod not
Disconnected stirring；
P6, static 1-3min, cross sieve for the mixed solution in the first mixing tank, and filtered mixed liquor is poured into third mixing
In bucket；
P7, it weighs 10-30kg silica flour and pours into and stir 1-3min in blender, then weigh 1.5-1.7kg bentonite and pour into stirring
2-4min is stirred in machine, and finally the mixed liquor in third mixing tank is poured into and stirs 5-15min in blender；
P8, the mixed liquor after stirring is poured into storage vat；
P9, weighing, storage.
Preferably, prepare raw materials of silica sol in step p1 specifically includes the following steps:
Q1, it weighs 5-10kg water and is put into reaction kettle, 3-4kg butylamine is added, 5-15min is sufficiently stirred；
Q2,7-8kg ethyl orthosilicate is added into reaction kettle, stirs 1-2min, stop stirring after forming gel；
Q3, the gel in reaction kettle is smashed to pieces using stamp pestle, reaction kettle is put into normal-temperature water cooling 15-45min；
Q4, water is added into reaction kettle, 50-70min is sufficiently stirred again, until generating colloidal sol.
Preferably, prepare quartzy powder raw material in step p1 specifically includes the following steps:
R1,2-4kg mineralizer is taken to be mixed into 10-30kg quartz sand；
R2, it mixture is put into ball mill smashes it through sieve；
R3, smashed mixture is put into calcining machine and is calcined, take out calcined mixture, carry out quenching；
R4, it the mixture after quenching is put into ball mill smashes it through sieve；
R5, quartzy powder raw material is obtained.
Preferably, prepare bentonite material in step p1 specifically includes the following steps:
S1, it takes 1.5-1.7kg raw ore of calcium base bentonite stone to be put into grinder to grind；
S2, the calcium-base bentonite powder after grinding is taken out, powdery sodium modifying agent is added, is thoroughly mixed；
S3, water is added into mixture, and is stirred continuously, and controlling modification temperature during adding water is 30-120 DEG C, it is modified
Time is 30-300min；
S4, it mixture is put into dryer drying obtains sodium bentonite.
Preferably, prepare sodium carboxymethylcellulose raw material in step p1 specifically includes the following steps:
T1, it takes smashed cellulose powder 0.1-0.2kg to be put into reaction utensil, catalyst is added, mixes well；
T2, heating reaction utensil instill sodium hydroxide solution into reaction utensil to 25-45 DEG C；
Chloroacetic acid sodium is added into reaction utensil, reacts 1-5h to 50-70 DEG C for T3, heating reaction utensil；
T4, it is cooled to room temperature to reaction utensil, alcoholic solution is added and impregnates 8-16h；
T5, PH regulator is added into reaction utensil, adjusts the PH to 6-8 of mixed liquor；
T6, sodium carboxymethylcellulose is obtained by filtration.
Preferably, sieve mesh number is 100-200 mesh in step R2, and sieve mesh number is 300-350 mesh in step R4.
Preferably, it is 50-200 DEG C that built-in temperature is dried in step S4, drying time 0.5-5h.
Preferably, in step T1 catalyst be tetramethyl ammonium hydrogen sulfate, tetrapropyl ammonium iodide, tetradecyl chloride pyridine,
Methoxycarbonyl base ethyltriphenylphosphonium bromide, tetrabutyl ammonium fluoride, tetrabutylammonium chloride, polyethylene glycol, trityl group iodate
One or more of phosphine.
Compared with prior art, the present invention provides a kind of overlay film sand shell mould coating and preparation method thereof, having following has
Beneficial effect:
1, the overlay film sand shell mould coating weighs 5-10kg water and is put into reaction kettle when preparing raw materials of silica sol, and 3-4kg is added
5-15min is sufficiently stirred in butylamine, and 7-8kg ethyl orthosilicate is added into reaction kettle, stirs 1-2min, stops after forming gel
Stirring, smashs the gel in reaction kettle to pieces using stamp pestle, and reaction kettle is put into normal-temperature water cooling 15-45min, is added into reaction kettle
Enter water, 50-70min is sufficiently stirred again, until generating colloidal sol；
When preparing quartzy powder raw material, takes 2-4kg mineralizer to be mixed into 10-30kg quartz sand, mixture is put into ball mill
Sieve is smashed it through, smashed mixture is put into calcining machine and is calcined, takes out calcined mixture, carries out quenching, it will
Mixture after quenching, which is put into ball mill, smashes it through sieve, obtains quartzy powder raw material；
It when preparing bentonite material, takes 1.5-1.7kg raw ore of calcium base bentonite stone to be put into grinder and grinds, after taking out grinding
Calcium-base bentonite powder, be added powdery sodium modifying agent, be thoroughly mixed, water be added into mixture, and be stirred continuously,
And it is 30-120 DEG C that modification temperature is controlled during adding water, mixture is put into dryer by modification time 30-300min
Drying obtains sodium bentonite；
When preparing sodium carboxymethylcellulose, smashed cellulose powder 0.1-0.2kg is taken to be put into reaction utensil, catalysis is added
Agent mixes well, and heats reaction utensil to 25-45 DEG C, and sodium hydroxide solution, heating reaction utensil to 50-70 are instilled into reaction utensil
DEG C, chloroacetic acid sodium is added into reaction utensil, reacts 1-5h, is cooled to room temperature to reaction utensil, alcoholic solution is added and impregnates 8-16h,
PH regulator is added into reaction utensil, adjusts the PH to 6-8 of mixed liquor, sodium carboxymethylcellulose is obtained by filtration；
It when preparing coating, weighs 2-3kg water and is put into the first mixing tank, weigh 2-3kg silica solution and be put into the second mixing tank,
And 5-15kg water is added, it is sufficiently stirred, the silica solution mixed liquor in the second mixing tank is poured into the first mixing tank, carboxylic first is weighed
Base sodium cellulosate 0.1-0.2kg is poured into the first mixing tank, and is stirred continuously during pouring into using stirring rod, static 1-
Mixed solution in first mixing tank is crossed sieve, filtered mixed liquor is poured into third mixing tank, 10- is weighed by 3min
30kg silica flour, which pours into, stirs 1-3min in blender, then weighs 1.5-1.7kg bentonite and pour into stirring 2-4min in blender,
Finally the mixed liquor in third mixing tank is poured into and stirs 5-15min in blender, the mixed liquor after stirring is poured into storing
In bucket, weighing, storage.
2, the overlay film sand shell mould coating, can guarantee not precipitate in 7 days, and suspension is higher, and the solvent in solution uses
Water reduces production cost.
3, the overlay film sand shell mould coating, it is intracavitary with the overlay film sand casting type of spray gun spraying to high-temperature molding after stirring,
Casting type chamber reaches high-intensitive after two minutes, using spontaneous curing in 12 hours, after meltshop is poured, casting R
The too deep place of arc will no longer generate irregular pockmark and subcutaneous blowhole, and casting no longer occurs gluing the situation of sand, reduces
Human and material resources consumption, reduces production cost.
Specific embodiment
Below in conjunction in the embodiment of the present invention, technical solution in the embodiment of the present invention is clearly and completely retouched
It states, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
Comparative example 1:
A kind of preparation method of overlay film sand shell mould coating is prepared as a raw material in coating preparation using aggregate, and using normal
The preparation method of rule.
Embodiment 1:
A kind of overlay film sand shell mould coating, specifically includes consisting of ingredient: water, silica solution, sodium carboxymethylcellulose, silica flour,
Bentonite.
Constituent is following parts by weight:
Water: 12.5kg；
Silica solution: 2.5kg；
Sodium carboxymethylcellulose: 0.1kg；
Silica flour: 20kg；
Bentonite: 1.6kg.
A kind of preparation method of overlay film sand shell mould coating, specifically includes the following steps:
P1, raw material preparation: raw materials of silica sol, quartzy powder raw material, bentonite material, sodium carboxymethylcellulose raw material are prepared；
P2, it weighs base fluid: weighing 2.5kg water and be put into the first mixing tank；
P3, it weighs 2.5kg silica solution and is put into the second mixing tank, and 10kg water is added, be sufficiently stirred；
P4, the silica solution mixed liquor in the second mixing tank is poured into the first mixing tank；
P5, it weighs sodium carboxymethylcellulose 0.1kg and pours into the first mixing tank, and constantly stirred during pouring into using stirring rod
It mixes；
P6, static 2min, cross sieve for the mixed solution in the first mixing tank, and filtered mixed liquor is poured into third mixing tank
In；
P7, it weighs 20kg silica flour and pours into and stir 2min in blender, then weigh 1.6kg bentonite and pour into stirring in blender
Mixed liquor in third mixing tank is finally poured into and stirs 10min in blender by 3min；
P8, the mixed liquor after stirring is poured into storage vat；
P9, weighing, storage.
Prepare raw materials of silica sol in step p1 specifically includes the following steps:
Q1, it weighs 8kg water and is put into reaction kettle, 3kg butylamine is added, 10min is sufficiently stirred；
Q2,7kg ethyl orthosilicate is added into reaction kettle, stirs 1min, stop stirring after forming gel；
Q3, the gel in reaction kettle is smashed to pieces using stamp pestle, reaction kettle is put into normal-temperature water cooling 25min；
Q4, water is added into reaction kettle, 60min is sufficiently stirred again, until generating colloidal sol.
Prepare quartzy powder raw material in step p1 specifically includes the following steps:
R1,3kg mineralizer is taken to be mixed into 20kg quartz sand；
R2, it mixture is put into ball mill smashes it through sieve；
R3, smashed mixture is put into calcining machine and is calcined, take out calcined mixture, carry out quenching；
R4, it the mixture after quenching is put into ball mill smashes it through sieve；
R5, quartzy powder raw material is obtained.
Prepare bentonite material in step p1 specifically includes the following steps:
S1, it takes 1.6kg raw ore of calcium base bentonite stone to be put into grinder to grind；
S2, the calcium-base bentonite powder after grinding is taken out, powdery sodium modifying agent is added, is thoroughly mixed；
S3, water is added into mixture, and is stirred continuously, and controlling modification temperature during adding water is 80 DEG C, modification time
For 180min；
S4, it mixture is put into dryer drying obtains sodium bentonite.
Sodium carboxymethylcellulose raw material is prepared in step p1 specifically includes the following steps:
T1, it takes smashed cellulose powder 0.1kg to be put into reaction utensil, catalyst is added, mixes well；
T2, heating reaction utensil instill sodium hydroxide solution into reaction utensil to 30 DEG C；
Chloroacetic acid sodium is added into reaction utensil, reacts 3h to 60 DEG C for T3, heating reaction utensil；
T4, it is cooled to room temperature to reaction utensil, alcoholic solution is added and impregnates 12h；
T5, PH regulator is added into reaction utensil, adjusts the PH to 7 of mixed liquor；
T6, sodium carboxymethylcellulose is obtained by filtration.
Sieve mesh number is 150 mesh in step R2, and sieve mesh number is 320 mesh in step R4.
It is 120 DEG C that built-in temperature is dried in step S4, drying time 3h.
Catalyst is tetramethyl ammonium hydrogen sulfate, tetrapropyl ammonium iodide, tetradecyl chloride pyridine, methoxycarbonyl in step T1
Base ethyltriphenylphosphonium bromide, tetrabutyl ammonium fluoride, tetrabutylammonium chloride, polyethylene glycol, one in trityl group phosphonium iodide
Kind is several.
It when preparing raw materials of silica sol, weighs 8kg water and is put into reaction kettle, 3kg butylamine is added, 10min is sufficiently stirred, to
7kg ethyl orthosilicate is added in reaction kettle, stirs 1min, stops stirring after forming gel, is smashed to pieces in reaction kettle using stamp pestle
Reaction kettle is put into normal-temperature water cooling 25min, water is added into reaction kettle, 60min is sufficiently stirred again, until raw by gel
At colloidal sol；
When preparing quartzy powder raw material, 3kg mineralizer is taken to be mixed into 20kg quartz sand, mixture is put into after being crushed in ball mill
Sieve is crossed, smashed mixture is put into calcining machine and is calcined, takes out calcined mixture, quenching is carried out, after quenching
Mixture be put into ball mill and smash it through sieve, obtain quartzy powder raw material；
When preparing bentonite material, takes 1.6kg raw ore of calcium base bentonite stone to be put into grinder and grind, the calcium after taking out grinding
Base bentonite powder is added powdery sodium modifying agent, is thoroughly mixed, water is added into mixture, and be stirred continuously, and
Adding control modification temperature during water is 80 DEG C, modification time 180min, and mixture is put into drying in dryer and obtains sodium
Base bentonite；
When preparing sodium carboxymethylcellulose, smashed cellulose powder 0.1kg is taken to be put into reaction utensil, catalyst is added,
It mixes well, heats reaction utensil to 30 DEG C, instill sodium hydroxide solution into reaction utensil, heating reaction utensil is to 60 DEG C, Xiang Fanying
Chloroacetic acid sodium is added in ware, reacts 3h, is cooled to room temperature to reaction utensil, alcoholic solution is added and impregnates 12h, is added into reaction utensil
PH regulator adjusts the PH to 7 of mixed liquor, sodium carboxymethylcellulose is obtained by filtration；
It when preparing coating, weighs 2.5kg water and is put into the first mixing tank, weigh 2.5kg silica solution and be put into the second mixing tank,
And 12.5kg water is added, it is sufficiently stirred, the silica solution mixed liquor in the second mixing tank is poured into the first mixing tank, carboxylic first is weighed
Base sodium cellulosate 0.1kg is poured into the first mixing tank, and is stirred continuously during pouring into using stirring rod, static 2min, will
Mixed solution in first mixing tank crosses sieve, and filtered mixed liquor is poured into third mixing tank, weighs 20kg silica flour
It pours into and stirs 2min in blender, then weigh 1.6kg bentonite and pour into stirring 3min in blender, it finally will be in third mixing tank
Mixed liquor pour into and stir 10min in blender, the mixed liquor after stirring is poured into storage vat, weighing, storage.
The overlay film sand shell mould coating, can guarantee not precipitate in 7 days, and suspension is higher, and the solvent in solution uses water,
Reduce production cost.
The overlay film sand shell mould coating, intracavitary with the overlay film sand casting type of spray gun spraying to high-temperature molding after stirring, warp
Casting type chamber reaches high-intensitive after spending two minutes, using spontaneous curing in 12 hours, after meltshop is poured, and casting R arc
Too deep place will no longer generate irregular pockmark and subcutaneous blowhole, and casting no longer occurs gluing the situation of sand, reduces people
Power, material resources consumption, reduce production cost.
Embodiment 2:
A kind of overlay film sand shell mould coating, specifically includes consisting of ingredient: water, silica solution, sodium carboxymethylcellulose, silica flour,
Bentonite.
Constituent is following parts by weight:
Water: 12.5kg；
Silica solution: 2.5kg；
Sodium carboxymethylcellulose: 0.2kg；
Silica flour: 20kg；
Bentonite: 1.6kg.
A kind of preparation method of overlay film sand shell mould coating, specifically includes the following steps:
P1, raw material preparation: raw materials of silica sol, quartzy powder raw material, bentonite material, sodium carboxymethylcellulose raw material are prepared；
P2, it weighs base fluid: weighing 2.5kg water and be put into the first mixing tank；
P3, it weighs 2.5kg silica solution and is put into the second mixing tank, and 10kg water is added, be sufficiently stirred；
P4, the silica solution mixed liquor in the second mixing tank is poured into the first mixing tank；
P5, it weighs sodium carboxymethylcellulose 0.2kg and pours into the first mixing tank, and constantly stirred during pouring into using stirring rod
It mixes；
P6, static 2min, cross sieve for the mixed solution in the first mixing tank, and filtered mixed liquor is poured into third mixing tank
In；
P7, it weighs 20kg silica flour and pours into and stir 2min in blender, then weigh 1.6kg bentonite and pour into stirring in blender
Mixed liquor in third mixing tank is finally poured into and stirs 10min in blender by 3min；
P8, the mixed liquor after stirring is poured into storage vat；
P9, weighing, storage.
Prepare raw materials of silica sol in step p1 specifically includes the following steps:
Q1, it weighs 8kg water and is put into reaction kettle, 3kg butylamine is added, 10min is sufficiently stirred；
Q2,7kg ethyl orthosilicate is added into reaction kettle, stirs 1min, stop stirring after forming gel；
Q3, the gel in reaction kettle is smashed to pieces using stamp pestle, reaction kettle is put into normal-temperature water cooling 25min；
Q4, water is added into reaction kettle, 60min is sufficiently stirred again, until generating colloidal sol.
Prepare quartzy powder raw material in step p1 specifically includes the following steps:
R1,3kg mineralizer is taken to be mixed into 20kg quartz sand；
R2, it mixture is put into ball mill smashes it through sieve；
R3, smashed mixture is put into calcining machine and is calcined, take out calcined mixture, carry out quenching；
R4, it the mixture after quenching is put into ball mill smashes it through sieve；
R5, quartzy powder raw material is obtained.
Prepare bentonite material in step p1 specifically includes the following steps:
S1, it takes 1.6kg raw ore of calcium base bentonite stone to be put into grinder to grind；
S2, the calcium-base bentonite powder after grinding is taken out, powdery sodium modifying agent is added, is thoroughly mixed；
S3, water is added into mixture, and is stirred continuously, and controlling modification temperature during adding water is 80 DEG C, modification time
For 180min；
S4, it mixture is put into dryer drying obtains sodium bentonite.
Sodium carboxymethylcellulose raw material is prepared in step p1 specifically includes the following steps:
T1, it takes smashed cellulose powder 0.2kg to be put into reaction utensil, catalyst is added, mixes well；
T2, heating reaction utensil instill sodium hydroxide solution into reaction utensil to 30 DEG C；
Chloroacetic acid sodium is added into reaction utensil, reacts 3h to 60 DEG C for T3, heating reaction utensil；
T4, it is cooled to room temperature to reaction utensil, alcoholic solution is added and impregnates 12h；
T5, PH regulator is added into reaction utensil, adjusts the PH to 7 of mixed liquor；
T6, sodium carboxymethylcellulose is obtained by filtration.
Sieve mesh number is 150 mesh in step R2, and sieve mesh number is 320 mesh in step R4.
It is 120 DEG C that built-in temperature is dried in step S4, drying time 3h.
Catalyst is tetramethyl ammonium hydrogen sulfate, tetrapropyl ammonium iodide, tetradecyl chloride pyridine, methoxycarbonyl in step T1
Base ethyltriphenylphosphonium bromide, tetrabutyl ammonium fluoride, tetrabutylammonium chloride, polyethylene glycol, one in trityl group phosphonium iodide
Kind is several.
It when preparing raw materials of silica sol, weighs 8kg water and is put into reaction kettle, 3kg butylamine is added, 10min is sufficiently stirred, to
7kg ethyl orthosilicate is added in reaction kettle, stirs 1min, stops stirring after forming gel, is smashed to pieces in reaction kettle using stamp pestle
Reaction kettle is put into normal-temperature water cooling 25min, water is added into reaction kettle, 60min is sufficiently stirred again, until raw by gel
At colloidal sol；
When preparing quartzy powder raw material, 3kg mineralizer is taken to be mixed into 20kg quartz sand, mixture is put into after being crushed in ball mill
Sieve is crossed, smashed mixture is put into calcining machine and is calcined, takes out calcined mixture, quenching is carried out, after quenching
Mixture be put into ball mill and smash it through sieve, obtain quartzy powder raw material；
When preparing bentonite material, takes 1.6kg raw ore of calcium base bentonite stone to be put into grinder and grind, the calcium after taking out grinding
Base bentonite powder is added powdery sodium modifying agent, is thoroughly mixed, water is added into mixture, and be stirred continuously, and
Adding control modification temperature during water is 80 DEG C, modification time 180min, and mixture is put into drying in dryer and obtains sodium
Base bentonite；
When preparing sodium carboxymethylcellulose, smashed cellulose powder 0.2kg is taken to be put into reaction utensil, catalyst is added,
It mixes well, heats reaction utensil to 30 DEG C, instill sodium hydroxide solution into reaction utensil, heating reaction utensil is to 60 DEG C, Xiang Fanying
Chloroacetic acid sodium is added in ware, reacts 3h, is cooled to room temperature to reaction utensil, alcoholic solution is added and impregnates 12h, is added into reaction utensil
PH regulator adjusts the PH to 7 of mixed liquor, sodium carboxymethylcellulose is obtained by filtration；
It when preparing coating, weighs 2.5kg water and is put into the first mixing tank, weigh 2.5kg silica solution and be put into the second mixing tank,
And 12.5kg water is added, it is sufficiently stirred, the silica solution mixed liquor in the second mixing tank is poured into the first mixing tank, carboxylic first is weighed
Base sodium cellulosate 0.2kg is poured into the first mixing tank, and is stirred continuously during pouring into using stirring rod, static 2min, will
Mixed solution in first mixing tank crosses sieve, and filtered mixed liquor is poured into third mixing tank, weighs 20kg silica flour
It pours into and stirs 2min in blender, then weigh 1.6kg bentonite and pour into stirring 3min in blender, it finally will be in third mixing tank
Mixed liquor pour into and stir 10min in blender, the mixed liquor after stirring is poured into storage vat, weighing, storage.
The overlay film sand shell mould coating, can guarantee not precipitate in 7 days, and suspension is higher, and the solvent in solution uses water,
Reduce production cost.
The overlay film sand shell mould coating, intracavitary with the overlay film sand casting type of spray gun spraying to high-temperature molding after stirring, warp
Casting type chamber reaches high-intensitive after spending two minutes, using spontaneous curing in 12 hours, after meltshop is poured, and casting R arc
Too deep place will no longer generate irregular pockmark and subcutaneous blowhole, and casting no longer occurs gluing the situation of sand, reduces people
Power, material resources consumption, reduce production cost.
Embodiment 3:
A kind of preparation method of overlay film sand shell mould coating, it is substantially the same manner as Example 2, the difference is that carboxylic is added in step P5
The quality of sodium carboxymethylcellulose pyce is 0.15kg.
Embodiment 4:
A kind of preparation method of overlay film sand shell mould coating, it is substantially the same manner as Example 2, moreover, also add in step P9
Enter 20mg preservative.
Coating after the preparation of above-mentioned comparative example 1, implementation 1-4 is detected, detecting step is will be respectively by comparative example
1, the coating tinning observation prepared in embodiment 1-4, every group of 200 tanks, testing result such as the following table 1:
| Comparative example 1 | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | |
| Generate the coating (a) of precipitating | 32 | 8 | 6 | 6 | 5 |
Table 1
To above-mentioned comparative example 1, implement the coating after the preparation of 1-4 and carry out experimental test, 1000 casting of selection are divided into 5 when test
Group, every group of 200 casting, is processed, and testing procedure is that 5 groups of casting use different preparation method production in 5 respectively
Coating is processed, and is detected after processing is completed to casting, test result is as follows table 2:
| Comparative example 1 | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | |
| Product (a) containing pockmark | 14 | 10 | 9 | 9 | 6 |
| Containing leachy product (a) | 13 | 8 | 8 | 7 | 5 |
| The product (a) of surface scab | 17 | 11 | 9 | 6 | 5 |
Table 2
Referring to the experimental data in above-described embodiment 1-4 and table 1, table 2 it can be concluded that, the painting made of sodium carboxymethylcellulose
Expect that suspendability is higher, rate of deposition is low, and in process, and raw material is made with the following method, weighs 5-10kg water and is put into
In reaction kettle, 3-4kg butylamine is added, 5-15min is sufficiently stirred, 7-8kg ethyl orthosilicate is added into reaction kettle, stirs 1-
2min stops stirring after forming gel, smashs the gel in reaction kettle to pieces using stamp pestle, reaction kettle is put into normal-temperature water cooling
Water is added into reaction kettle, 50-70min is sufficiently stirred again by 15-45min, until generating colloidal sol；
When preparing quartzy powder raw material, takes 2-4kg mineralizer to be mixed into 10-30kg quartz sand, mixture is put into ball mill
Sieve is smashed it through, smashed mixture is put into calcining machine and is calcined, takes out calcined mixture, carries out quenching, it will
Mixture after quenching, which is put into ball mill, smashes it through sieve, obtains quartzy powder raw material；
It when preparing bentonite material, takes 1.5-1.7kg raw ore of calcium base bentonite stone to be put into grinder and grinds, after taking out grinding
Calcium-base bentonite powder, be added powdery sodium modifying agent, be thoroughly mixed, water be added into mixture, and be stirred continuously,
And it is 30-120 DEG C that modification temperature is controlled during adding water, mixture is put into dryer by modification time 30-300min
Drying obtains sodium bentonite；
When preparing sodium carboxymethylcellulose, smashed cellulose powder 0.1-0.2kg is taken to be put into reaction utensil, catalysis is added
Agent mixes well, and heats reaction utensil to 25-45 DEG C, and sodium hydroxide solution, heating reaction utensil to 50-70 are instilled into reaction utensil
DEG C, chloroacetic acid sodium is added into reaction utensil, reacts 1-5h, is cooled to room temperature to reaction utensil, alcoholic solution is added and impregnates 8-16h,
PH regulator is added into reaction utensil, adjusts the PH to 6-8 of mixed liquor, sodium carboxymethylcellulose is obtained by filtration；Referring to table 1 and table
2 significantly more efficient can reduce the generation rate of pockmark, bubble on casting after production, and energy using the coating of preparation method production
The scab rate for effectively reducing cast(ing) surface, effectively reduces production cost.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of overlay film sand shell mould coating, which is characterized in that specifically include consisting of ingredient: water, silica solution, carboxymethyl cellulose
Plain sodium, silica flour, bentonite.
2. a kind of overlay film sand shell mould coating according to claim 1, which is characterized in that the constituent is following weight
Part:
Water: 12-13 parts；
Silica solution: 2-3 parts；
Sodium carboxymethylcellulose: 0.1-0.2 parts；
Silica flour: 10-30 parts；
Bentonite: 1.5-1.7 parts.
3. a kind of preparation method of overlay film sand shell mould coating as described in claim 1, which is characterized in that specifically include following step
It is rapid:
P1, raw material preparation: raw materials of silica sol, quartzy powder raw material, bentonite material, sodium carboxymethylcellulose raw material are prepared；
P2, it weighs base fluid: weighing 2-3kg water and be put into the first mixing tank；
P3, it weighs 2-3kg silica solution and is put into the second mixing tank, and 5-15kg water is added, be sufficiently stirred；
P4, the silica solution mixed liquor in the second mixing tank is poured into the first mixing tank；
P5, weigh sodium carboxymethylcellulose 0.1-0.2kg and pour into the first mixing tank, and during pouring into using stirring rod not
Disconnected stirring；
P6, static 1-3min, cross sieve for the mixed solution in the first mixing tank, and filtered mixed liquor is poured into third mixing
In bucket；
P7, it weighs 10-30kg silica flour and pours into and stir 1-3min in blender, then weigh 1.5-1.7kg bentonite and pour into stirring
2-4min is stirred in machine, and finally the mixed liquor in third mixing tank is poured into and stirs 5-15min in blender；
P8, the mixed liquor after stirring is poured into storage vat；
P9, weighing, storage.
4. a kind of preparation method of overlay film sand shell mould coating according to claim 3, which is characterized in that prepared in step p1
Raw materials of silica sol specifically includes the following steps:
Q1, it weighs 5-10kg water and is put into reaction kettle, 3-4kg butylamine is added, 5-15min is sufficiently stirred；
Q2,7-8kg ethyl orthosilicate is added into reaction kettle, stirs 1-2min, stop stirring after forming gel；
Q3, the gel in reaction kettle is smashed to pieces using stamp pestle, reaction kettle is put into normal-temperature water cooling 15-45min；
Q4, water is added into reaction kettle, 50-70min is sufficiently stirred again, until generating colloidal sol.
5. a kind of preparation method of overlay film sand shell mould coating according to claim 3, which is characterized in that prepared in step p1
Quartzy powder raw material specifically includes the following steps:
R1,2-4kg mineralizer is taken to be mixed into 10-30kg quartz sand；
R2, it mixture is put into ball mill smashes it through sieve；
R3, smashed mixture is put into calcining machine and is calcined, take out calcined mixture, carry out quenching；
R4, it the mixture after quenching is put into ball mill smashes it through sieve；
R5, quartzy powder raw material is obtained.
6. a kind of preparation method of overlay film sand shell mould coating according to claim 3, which is characterized in that prepared in step p1
Bentonite material specifically includes the following steps:
S1, it takes 1.5-1.7kg raw ore of calcium base bentonite stone to be put into grinder to grind；
S2, the calcium-base bentonite powder after grinding is taken out, powdery sodium modifying agent is added, is thoroughly mixed；
S3, water is added into mixture, and is stirred continuously, and controlling modification temperature during adding water is 30-120 DEG C, it is modified
Time is 30-300min；
S4, it mixture is put into dryer drying obtains sodium bentonite.
7. a kind of preparation method of overlay film sand shell mould coating according to claim 3, which is characterized in that prepared in step p1
Sodium carboxymethylcellulose raw material specifically includes the following steps:
T1, it takes smashed cellulose powder 0.1-0.2kg to be put into reaction utensil, catalyst is added, mixes well；
T2, heating reaction utensil instill sodium hydroxide solution into reaction utensil to 25-45 DEG C；
Chloroacetic acid sodium is added into reaction utensil, reacts 1-5h to 50-70 DEG C for T3, heating reaction utensil；
T4, it is cooled to room temperature to reaction utensil, alcoholic solution is added and impregnates 8-16h；
T5, PH regulator is added into reaction utensil, adjusts the PH to 6-8 of mixed liquor；
T6, sodium carboxymethylcellulose is obtained by filtration.
8. a kind of preparation method of overlay film sand shell mould coating according to claim 5, which is characterized in that sieve in step R2
Mesh number is 100-200 mesh, and sieve mesh number is 300-350 mesh in step R4.
9. a kind of preparation method of overlay film sand shell mould coating according to claim 6, which is characterized in that dried in step S4
Built-in temperature is 50-200 DEG C, drying time 0.5-5h.
10. a kind of preparation method of overlay film sand shell mould coating according to claim 7, which is characterized in that urged in step T1
Agent is tetramethyl ammonium hydrogen sulfate, tetrapropyl ammonium iodide, tetradecyl chloride pyridine, methoxycarbonyl base ethyltriphenyl phosphonium bromide
One or more of phosphine, tetrabutyl ammonium fluoride, tetrabutylammonium chloride, polyethylene glycol, trityl group phosphonium iodide.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112828242A (en) * | 2021-01-27 | 2021-05-25 | 桑超 | Water-based paint for special casting process and preparation method and application thereof |
| CN114799041A (en) * | 2022-05-07 | 2022-07-29 | 安徽大天铸业有限责任公司 | Precoated sand-loam core coating for inner runner of casting and preparation method thereof |
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| CN114799041A (en) * | 2022-05-07 | 2022-07-29 | 安徽大天铸业有限责任公司 | Precoated sand-loam core coating for inner runner of casting and preparation method thereof |
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