CN104923712A - 3D printing precoated sand and preparation method thereof - Google Patents

3D printing precoated sand and preparation method thereof Download PDF

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Publication number
CN104923712A
CN104923712A CN201510262226.3A CN201510262226A CN104923712A CN 104923712 A CN104923712 A CN 104923712A CN 201510262226 A CN201510262226 A CN 201510262226A CN 104923712 A CN104923712 A CN 104923712A
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sand
precoated sand
cashew nut
prints
nut shell
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CN201510262226.3A
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CN104923712B (en
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熊杰
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十堰长江造型材料有限公司
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Abstract

The invention relates to a precoated sand for a casting field, in particular to a 3D printing precoated sand. The 3D printing precoated sand comprises the following components: 5-8 wt% of cashew nut shells, 1-2 wt% of melamino-formaldehyde resins, 1-5 wt% of cashew nut shell liquid modified phenolic resins, 0.6-0.8 wt% of urotropin, 0.1-0.4 wt% of lubricant, 0.1-0.8 wt% of binding agents, 0.1-0.4 wt% of coupling agents, 0.5-1 wt% of dispersing agents, and the balance of crude sands. The prepared 3D printing precoated sand has high strength, high-temperature resistance, low gas generating amount and low expansion rate.

Description

A kind of 3D prints precoated sand and preparation method thereof

Technical field

The present invention relates to a kind of for the precoated sand in casting field, particularly relate to a kind of 3D and print precoated sand and preparation method thereof.

Background technology

3D prints, and is the one of rapid shaping technique, and it is a kind of based on mathematical model file, uses powdery metal, sand grains or plastics etc. can jointing material, is carried out the technology of constructed object by the mode successively printed.The field such as Making mold, industrial design of being everlasting is used to prepare model.Conventional cast industry is developed new product needs the process such as first mold, coremaking, core assembly, casting, length consuming time, and cost is high, and efficiency is low; Novel 3D printing technique, do not need mold, the operations such as coremaking substantially reduce new product development cycle, raise the efficiency.Because traditional precoated sand is in the deficiency of the aspect of performances such as intensity, stability, uniformity and grittiness, 3D prints precoated sand and substitutes traditional precoated sand and be used on 3D printing technique and become imperative trend.

Patent CN103272997A discloses iron castings precoated sand, comprise roughing sand, binding agent, methenamine, phenolic resins and additive A, described roughing sand is made up of 55-60 part emergy, 60-70 part bauxite sand, 10-20 part diatomite, the granularity of described roughing sand is 100-150 order, described bonding agent adds 4-6 part water react by by 3-5 part boric acid, 2-4 part waterglass, 1-2 part water soluble polymer rubber powder, 3-5 part starch, 0.5-0.8 part rosin, 4-5 part dextrin, and reaction post-drying obtains; Described additive A mixes burning forge process by by 4-6 part cement slurry, 2-4 part sawdust, 5-8 part water, the granularity of cement slurry is 0.5-0.8mm, burning forges product and 2-4 part montmorillonite powder, 3-4 part waterglass mixing granulation, roasting 3-4 hour again, sintering temperature controls, at 300-400 DEG C, to obtain additive A after pulverizing; This invention resistance to water soak is better, roughness is less, not easily in foundry goods scab.Patent CN101934346A discloses a kind of precoated sand, comprise roughing sand, binding agent, curing agent and coupling agent, the consumption of described curing agent is the 40-60% of binding agent gross mass, the consumption of coupling agent is the 0.2-0.5% of binding agent gross mass, the consumption of binding agent is the 1-1.5% of roughing sand gross mass, the granularity of roughing sand is 100-150 order, the constituent of roughing sand and weight ratio thereof are: yellow ground 70-80, diatomite 10-20, high-temperature cement 5-15, the constituent of binding agent and weight ratio thereof are: thermosetting phenolic resin 5-10, novolac resin 90-95.Not only heat resistance is better, roughness is less in the present invention, and gas permeability better, scab on foundry goods can be avoided.Patent CN104190854A discloses a kind of regeneration precoated sand, and its component and weight ratio are: discarded precoated sand: 55% ~ 65%; Isopropyl alcohol: 10 ~ 15%; Water: 10 ~ 15%; Silica sand: 8 ~ 15%; Methenamine: 2 ~ 5%; Phenolic resins: 0.5% ~ 1%; Curing agent: 0.1% ~ 0.2%; Calcium stearate: 0.05% ~ 0.1%, the invention also discloses a kind of regeneration precoated sand preparation method, by dropping in mixer after discarded precoated sand fragmentation, be heated to 120 DEG C and add isopropyl alcohol and water mix, mix and add silica sand, methenamine, calcium stearate, phenolic resins and curing agent successively and carry out uniform stirring, reach and can generate regeneration precoated sand without high temperature degreasing, this regeneration precoated sand has that intensity is high, toughness is high, high temperature resistant, gas forming amount is low, the advantage of the fast and product not scab of crust speed.

It is in layer adopted by precoated sand gravity to superpose to fire by laser the process making its curing molding that 3D prints, 3D printing technique adopts and is the mode that superposes of gravity and is that laser forms by a firing compared with common core manufacturing craft, and common core manufacturing craft adopts pressure to penetrate the type of making and coremaking temperature generally at 200-260 degree, and 3D prints precoated sand is all be used in more complicated, require on higher foundry goods; No matter 3D is that coremaking or casting are high to the performance requirement of precoated sand if printing precoated sand.The each tool advantage of precoated sand disclosed in above-mentioned patent, but still the requirement printed at 3D cannot be met.Thus cause adopting the cycle of 3D printing technique cast article long, efficiency is low and high in cost of production is not enough.

Summary of the invention

The invention provides a kind of 3D with good adhesive force, smoothness, intensity and toughness and print precoated sand and preparation method thereof.

A kind of 3D prints precoated sand, comprises the component of following content:

Cashew nut shell 5-8 wt %

Melamine resin 1-2 wt %

Cashew nut shell liquid phenol-formaldehyde resin modified 1-5 wt %

Methenamine 0.6-0.8 wt %

Lubricant 0.1-0.4 wt %

Binding agent 0.1-0.8 wt %

Coupling agent 0.1-0.4 wt %

Dispersant 0.5-1 wt %

Roughing sand surplus.

Described roughing sand is two or more compounds of ceramsite sand, alumine sand, zircon sand and chromite sand.

Preferably, the granularity of described roughing sand and cashew nut shell is 110-130 order, and polishing is to particle rounding.

Described coupling agent is the compound of one or more coupling agents in amino silane, borate and Tissuemat E.

Described binding agent is one or more in polyvinyl alcohol, Sodium Polyacrylate, polyacrylamide and chlorate.Preferably, described binding agent is polyvinyl alcohol and chlorate, and its weight ratio is 2:3.

Described dispersant is one or more in sodium phosphate trimer, lauryl sodium sulfate and methyl anyl alcohol.

Preferably, a kind of 3D prints precoated sand, comprises the component of following content:

Cashew nut shell 6 wt %

Melamine resin 1.5 wt %

Cashew nut shell liquid phenol-formaldehyde resin modified 3 wt %

Methenamine 0.7 wt %

Lubricant 0.2 wt %

Polyvinyl alcohol 0.2 wt %

Chlorate 0.3wt %

Borate 0.25 wt %

Methyl anyl alcohol 0.8 %

Roughing sand surplus;

3D prints a preparation method for precoated sand, comprises the following steps:

(1) by roughing sand and the washing of cashew nut shell, remove silt wherein and other foreign material and metaling, then it is pulverized, sieve;

(2) roughing sand of above-mentioned process and cashew nut shell are preheated to 80-95 DEG C, then join in puddle mixer, mix;

(3) in puddle mixer, add melamine resin, cashew nut shell liquid modified phenolic resin and binding agent, stir after 1-2 minute, add methenamine, stirring reaction 5-8 minute;

(4) lubricant, coupling agent and dispersant is added, mix and blend 5-10 minute in the compound obtained to step (3); Obtain precoated sand.

Preferably, described step (1) roughing sand after crushed and cashew nut shell cross 110-130 object sieve, and polishing is to particle rounding.

Preferably, after described step (3) adds methenamine, compound is heated with stirring to 155-165 DEG C, then stirring reaction 5-8 minute.

Preferably, in described step (4), treat that the compound that step (3) obtains is air-cooled to 100-110 DEG C, add lubricant, coupling agent and dispersant.

The granularity of prepared precoated sand: 115-140 order; Hot bending strength: 5-7MPa; Cold bending strength: 15-18MPa; Gas forming amount 13-16vm/g; Fusing point: 100-110 DEG C; Anxious coefficient of thermal expansion is less than 0.1%.

Melamine resin in the present invention and cashew nut shell liquid phenol-formaldehyde resin modified with the use of, have fine humidification to the smoothness on precoated sand surface and toughness.Other compositions of melamine resin used in the present invention and cashew nut shell liquid phenol-formaldehyde resin modified and precoated sand can merge mutually, thus better play its performance.Especially when the mass ratio of melamine resin and cashew nut shell liquid phenol-formaldehyde resin modified is 1:2, more obvious to the humidification of precoated sand performance.

The invention has the beneficial effects as follows: a kind of 3D of the present invention prints precoated sand and adopts melamine resin, cashew nut shell liquid phenol-formaldehyde resin modified and binding agent simultaneously, other compositions of itself and precoated sand can merge mutually, thus better play its performance, the performances such as the intensity of raising precoated sand and heatproof.Present invention uses two or more sand grains and coordinate cashew nut shell, and Control granularity and grain shape, further increase intensity and the toughness of precoated sand, there is good adhesive force.The present invention also employs lubricant, coupling agent and dispersant simultaneously and defines its proportioning, and make to cover the homogenize material configuration of sand film Central Plains, plasticity strengthens, quality evenly.3D prepared by the present invention prints precoated sand and has high, high temperature resistant, the low gas forming amount of intensity and low thermal expansion, and it is applied to 3D and prints, compared with traditional precoated sand, can expedite product shaping, shorten product development cycle, enhance productivity.

Detailed description of the invention

Embodiment 1

A kind of 3D prints precoated sand, comprises the component of following content:

Cashew nut shell 5wt %

Melamine resin 1wt %

Cashew nut shell liquid phenol-formaldehyde resin modified 1wt %

Methenamine 0.6wt %

Lubricant 0.1 wt %

Sodium Polyacrylate 0.1wt %

Amino silane 0.1 wt %

Lauryl sodium sulfate 0.5 wt %

Roughing sand surplus;

Print the proportioning of precoated sand according to above-mentioned 3D, prepare as follows, comprise the following steps:

(1) by roughing sand and the washing of cashew nut shell, remove silt wherein and other foreign material and metaling, then it is pulverized, cross 110-130 object sieve, and polishing is to particle rounding;

(2) roughing sand of above-mentioned process and cashew nut shell are preheated to 80-95 DEG C, then join in puddle mixer, mix;

(3) in puddle mixer, add melamine resin, cashew nut shell liquid modified phenolic resin and Sodium Polyacrylate, stir after 1-2 minute, add methenamine, be heated with stirring to 155-165 DEG C, reaction 5-8 minute;

(4) treat that the compound that step (3) obtains is air-cooled to 100-110 DEG C, add lubricant, coupling agent and dispersant, mix and blend 5-10 minute; Obtain precoated sand.

Embodiment 2

A kind of 3D prints precoated sand, comprises the component of following content:

Cashew nut shell 6 wt %

Melamine resin 1.5 wt %

Cashew nut shell liquid phenol-formaldehyde resin modified 3 wt %

Methenamine 0.7 wt %

Lubricant 0.2 wt %

Polyvinyl alcohol 0.2 wt %

Chlorate 0.3wt %

Borate 0.25 wt %

Methyl anyl alcohol 0.8 %

Roughing sand surplus;

Print the proportioning of precoated sand according to above-mentioned 3D, prepare as follows, comprise the following steps:

(1) by roughing sand and the washing of cashew nut shell, remove silt wherein and other foreign material and metaling, then it is pulverized, cross 110-130 object sieve, and polishing is to particle rounding;

(2) roughing sand of above-mentioned process and cashew nut shell are preheated to 80-95 DEG C, then join in puddle mixer, mix;

(3) in puddle mixer, add melamine resin, cashew nut shell liquid modified phenolic resin, polyvinyl alcohol and chlorate, stir after 1-2 minute, add methenamine, be heated with stirring to 155-165 DEG C, reaction 5-8 minute;

(4) treat that the compound that step (3) obtains is air-cooled to 100-110 DEG C, add lubricant, coupling agent and dispersant, mix and blend 5-10 minute; Obtain precoated sand.

Embodiment 3

A kind of 3D prints precoated sand, comprises the component of following content:

Cashew nut shell 8 wt %

Melamine resin 2 wt %

Cashew nut shell liquid phenol-formaldehyde resin modified 5 wt %

Methenamine 0.8 wt %

Lubricant 0.4 wt %

Polyacrylamide 0.6wt %

Chlorate 0.2wt %

Tissuemat E 0.4 wt %

Sodium phosphate trimer 1 wt %

Roughing sand surplus;

Print the proportioning of precoated sand according to above-mentioned 3D, prepare as follows, comprise the following steps:

(1) by roughing sand and the washing of cashew nut shell, remove silt wherein and other foreign material and metaling, then it is pulverized, cross 110-130 object sieve, and polishing is to particle rounding;

(2) roughing sand of above-mentioned process and cashew nut shell are preheated to 80-95 DEG C, then join in puddle mixer, mix;

(3) in puddle mixer, add melamine resin, cashew nut shell liquid modified phenolic resin and polyacrylamide, stir after 1-2 minute, add methenamine, be heated with stirring to 155-165 DEG C, reaction 5-8 minute;

(4) treat that the compound that step (3) obtains is air-cooled to 100-110 DEG C, add lubricant, coupling agent and dispersant, mix and blend 5-10 minute; Obtain precoated sand.

Embodiment 4

A kind of 3D prints precoated sand, comprises the component of following content:

Cashew nut shell 6 wt %

Cashew nut shell liquid phenol-formaldehyde resin modified 3 wt %

Methenamine 0.7 wt %

Lubricant 0.2 wt %

Polyvinyl alcohol 0.2 wt %

Chlorate 0.3wt %

Borate 0.25 wt %

Methyl anyl alcohol 0.8 %

Roughing sand surplus;

Print the proportioning of precoated sand according to above-mentioned 3D, prepare as follows, comprise the following steps:

(1) by roughing sand and the washing of cashew nut shell, remove silt wherein and other foreign material and metaling, then it is pulverized, cross 110-130 object sieve, and polishing is to particle rounding;

(2) roughing sand of above-mentioned process and cashew nut shell are preheated to 80-95 DEG C, then join in puddle mixer, mix;

(3) in puddle mixer, add melamine resin, cashew nut shell liquid modified phenolic resin, polyvinyl alcohol and chlorate, stir after 1-2 minute, add methenamine, be heated with stirring to 155-165 DEG C, reaction 5-8 minute;

(4) treat that the compound that step (3) obtains is air-cooled to 100-110 DEG C, add lubricant, coupling agent and dispersant, mix and blend 5-10 minute; Obtain precoated sand.

Embodiment 5

A kind of 3D prints precoated sand, comprises the component of following content:

Cashew nut shell 6 wt %

Melamine resin 1.5 wt %

Cashew nut shell liquid phenol-formaldehyde resin modified 3 wt %

Methenamine 0.7 wt %

Lubricant 0.2 wt %

Polyvinyl alcohol 0.4 wt %

Chlorate 0.1wt %

Borate 0.25 wt %

Methyl anyl alcohol 0.8 %

Roughing sand surplus;

Print the proportioning of precoated sand according to above-mentioned 3D, prepare as follows, comprise the following steps:

(1) by roughing sand and the washing of cashew nut shell, remove silt wherein and other foreign material and metaling, then it is pulverized, cross 110-130 object sieve, and polishing is to particle rounding;

(2) roughing sand of above-mentioned process and cashew nut shell are preheated to 80-95 DEG C, then join in puddle mixer, mix;

(3) in puddle mixer, add melamine resin, cashew nut shell liquid modified phenolic resin, polyvinyl alcohol and chlorate, stir after 1-2 minute, add methenamine, be heated with stirring to 155-165 DEG C, reaction 5-8 minute;

(4) treat that the compound that step (3) obtains is air-cooled to 100-110 DEG C, add lubricant, coupling agent and dispersant, mix and blend 5-10 minute; Obtain precoated sand.

Embodiment 6

A kind of 3D prints precoated sand, comprises the component of following content:

Cashew nut shell 6 wt %

Melamine resin 1.5 wt %

Cashew nut shell liquid phenol-formaldehyde resin modified 3 wt %

Methenamine 0.7 wt %

Lubricant 0.2 wt %

Polyvinyl alcohol 0.2 wt %

Chlorate 0.3wt %

Borate 0.25 wt %

Methyl anyl alcohol 0.8 %

Roughing sand surplus;

Print the proportioning of precoated sand according to above-mentioned 3D, prepare as follows, comprise the following steps:

(1) by roughing sand and the washing of cashew nut shell, remove silt wherein and other foreign material and metaling, then it is pulverized, sieve;

(2) roughing sand of above-mentioned process and cashew nut shell are preheated to 80-95 DEG C, then join in puddle mixer, mix;

(3) in puddle mixer, add melamine resin, cashew nut shell liquid modified phenolic resin and binding agent, stir after 1-2 minute, add methenamine, stirring reaction 5-8 minute;

(4) lubricant, coupling agent and dispersant is added, mix and blend 5-10 minute in the compound obtained to step (3); Obtain precoated sand.

Performance test is carried out to the precoated sand prepared by above-described embodiment 1-6.Its performance test results is in table 1.

The performance of table 1. precoated sand

Above precoated sand and preparation method thereof is printed to a kind of 3D that the embodiment of the present invention provides, be described in detail, apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (10)

1. 3D prints a precoated sand, and it is characterized in that, described precoated sand comprises the component of following content:
Cashew nut shell 5-8 wt %
Melamine resin 1-2 wt %
Cashew nut shell liquid phenol-formaldehyde resin modified 1-5 wt %
Methenamine 0.6-0.8 wt %
Lubricant 0.1-0.4 wt %
Binding agent 0.1-0.8 wt %
Coupling agent 0.1-0.4 wt %
Dispersant 0.5-1 wt %
Roughing sand surplus.
2. a kind of 3D according to claim 1 prints precoated sand, and it is characterized in that, described roughing sand is two or more compounds of ceramsite sand, alumine sand, zircon sand and chromite sand.
3. a kind of 3D according to claim 1 prints precoated sand, and it is characterized in that, the granularity of described roughing sand and cashew nut shell is 110-130 order, and polishing is to particle rounding.
4. a kind of 3D according to claim 1 prints precoated sand, it is characterized in that, described binding agent is one or more in polyvinyl alcohol, Sodium Polyacrylate, polyacrylamide and chlorate.
5. a kind of 3D according to claim 1 prints precoated sand, it is characterized in that, described dispersant is one or more in sodium phosphate trimer, lauryl sodium sulfate and methyl anyl alcohol.
6. a kind of 3D according to claim 1 prints precoated sand, it is characterized in that, described 3D prints precoated sand, comprises the component of following content:
Cashew nut shell 6 wt %
Melamine resin 1.5 wt %
Cashew nut shell liquid phenol-formaldehyde resin modified 3 wt %
Methenamine 0.7 wt %
Lubricant 0.2 wt %
Polyvinyl alcohol 0.2 wt %
Chlorate 0.3wt %
Borate 0.25 wt %
Methyl anyl alcohol 0.8 %
Roughing sand surplus.
7. a kind of 3D as claimed in claim 1 prints the preparation method of precoated sand, and it is characterized in that, the method comprises the following steps:
(1) by roughing sand and the washing of cashew nut shell, remove silt wherein and other foreign material and metaling, then it is pulverized, sieve;
(2) roughing sand of above-mentioned process and cashew nut shell are preheated to 80-95 DEG C, then join in puddle mixer, mix;
(3) in puddle mixer, add melamine resin, cashew nut shell liquid modified phenolic resin and binding agent, stir after 1-2 minute, add methenamine, stirring reaction 5-8 minute;
(4) lubricant, coupling agent and dispersant is added, mix and blend 5-10 minute in the compound obtained to step (3); Obtain precoated sand.
8. a kind of 3D according to claim 7 prints the preparation method of precoated sand, it is characterized in that, described step (1) roughing sand after crushed and cashew nut shell cross 110-130 object sieve, and polishing is to particle rounding.
9. a kind of 3D according to claim 7 prints the preparation method of precoated sand, and it is characterized in that, after described step (3) adds methenamine, compound is heated with stirring to 155-165 DEG C, stirring reaction 5-8 minute.
10. a kind of 3D according to claim 7 prints the preparation method of precoated sand, it is characterized in that, in described step (4), treats that the compound that step (3) obtains is air-cooled to 100-110 DEG C, add lubricant, coupling agent and dispersant.
CN201510262226.3A 2015-05-20 2015-05-20 A kind of 3D prints precoated sand CN104923712B (en)

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CN105195669A (en) * 2015-10-28 2015-12-30 九江学院 Preparation method of resin binder capable of realizing CO2 gas hardening
CN106001386A (en) * 2016-05-26 2016-10-12 合肥市田源精铸有限公司 Ductile iron crankshaft molding sand and preparation method thereof
CN106077426A (en) * 2016-07-29 2016-11-09 无锡市三峰仪器设备有限公司 A kind of instrument Foundry Coated Sand of resistance to water soak
CN106563764A (en) * 2016-10-26 2017-04-19 宁夏共享模具有限公司 Precoated sand material for 3D printing and preparing method and forming method of precoated sand material
CN108296421A (en) * 2017-10-27 2018-07-20 柳州市柳晶科技股份有限公司 A kind of precoated sand for 3D printing
CN108296476A (en) * 2017-09-11 2018-07-20 柳州市柳晶科技股份有限公司 A kind of 3D printing coremaking precoated sand
CN108296410A (en) * 2017-09-27 2018-07-20 柳州市柳晶科技股份有限公司 A kind of 3D printing high intensity precoated sand and preparation method thereof
CN108296420A (en) * 2017-10-27 2018-07-20 柳州市柳晶科技股份有限公司 A kind of 3D printing precoated sand and preparation method thereof
CN108296418A (en) * 2017-09-29 2018-07-20 柳州市柳晶科技股份有限公司 A kind of precoated sand and preparation method thereof for 3D printing
CN109277517A (en) * 2018-11-28 2019-01-29 合肥仁创铸造材料有限公司 A kind of casting high temperature resistant haydite precoated sand and preparation method thereof
CN109746382A (en) * 2019-03-04 2019-05-14 苏州轻金三维科技有限公司 A kind of 3 D-printing precoated sand and preparation method thereof

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CN105195669A (en) * 2015-10-28 2015-12-30 九江学院 Preparation method of resin binder capable of realizing CO2 gas hardening
CN106001386A (en) * 2016-05-26 2016-10-12 合肥市田源精铸有限公司 Ductile iron crankshaft molding sand and preparation method thereof
CN106077426A (en) * 2016-07-29 2016-11-09 无锡市三峰仪器设备有限公司 A kind of instrument Foundry Coated Sand of resistance to water soak
CN106563764A (en) * 2016-10-26 2017-04-19 宁夏共享模具有限公司 Precoated sand material for 3D printing and preparing method and forming method of precoated sand material
CN108296476A (en) * 2017-09-11 2018-07-20 柳州市柳晶科技股份有限公司 A kind of 3D printing coremaking precoated sand
CN108296410A (en) * 2017-09-27 2018-07-20 柳州市柳晶科技股份有限公司 A kind of 3D printing high intensity precoated sand and preparation method thereof
CN108296410B (en) * 2017-09-27 2020-04-10 柳州市柳晶科技股份有限公司 3D prints and uses high strength tectorial membrane sand
CN108296418A (en) * 2017-09-29 2018-07-20 柳州市柳晶科技股份有限公司 A kind of precoated sand and preparation method thereof for 3D printing
CN108296418B (en) * 2017-09-29 2020-04-10 柳州市柳晶科技股份有限公司 Precoated sand for 3D printing and preparation method thereof
CN108296421B (en) * 2017-10-27 2020-01-10 柳州市柳晶科技股份有限公司 Precoated sand for 3D printing
CN108296421A (en) * 2017-10-27 2018-07-20 柳州市柳晶科技股份有限公司 A kind of precoated sand for 3D printing
CN108296420A (en) * 2017-10-27 2018-07-20 柳州市柳晶科技股份有限公司 A kind of 3D printing precoated sand and preparation method thereof
CN109277517A (en) * 2018-11-28 2019-01-29 合肥仁创铸造材料有限公司 A kind of casting high temperature resistant haydite precoated sand and preparation method thereof
CN109746382A (en) * 2019-03-04 2019-05-14 苏州轻金三维科技有限公司 A kind of 3 D-printing precoated sand and preparation method thereof

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