CN102688979A - Coated sand with long shelf life, and production method of coated sand - Google Patents
Coated sand with long shelf life, and production method of coated sand Download PDFInfo
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- CN102688979A CN102688979A CN2012102107856A CN201210210785A CN102688979A CN 102688979 A CN102688979 A CN 102688979A CN 2012102107856 A CN2012102107856 A CN 2012102107856A CN 201210210785 A CN201210210785 A CN 201210210785A CN 102688979 A CN102688979 A CN 102688979A
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- sand
- phenolic resins
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- 239000004576 sand Substances 0.000 title claims abstract description 92
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 152
- 239000005011 phenolic resin Substances 0.000 claims abstract description 48
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 48
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 31
- 235000010299 hexamethylene tetramine Nutrition 0.000 claims abstract description 23
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical group C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims abstract description 23
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000004327 boric acid Substances 0.000 claims abstract description 20
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical group [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims abstract description 19
- 239000008116 calcium stearate Substances 0.000 claims abstract description 19
- 235000013539 calcium stearate Nutrition 0.000 claims abstract description 19
- 239000000314 lubricant Substances 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 31
- 229960004011 methenamine Drugs 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 11
- 238000013467 fragmentation Methods 0.000 claims description 5
- 238000006062 fragmentation reaction Methods 0.000 claims description 5
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 239000007864 aqueous solution Substances 0.000 description 10
- 229920005989 resin Polymers 0.000 description 10
- 239000011347 resin Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 230000004927 fusion Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 239000005711 Benzoic acid Substances 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000010233 benzoic acid Nutrition 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000320 mechanical mixture Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003110 molding sand Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 229960004889 salicylic acid Drugs 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
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- Mold Materials And Core Materials (AREA)
Abstract
The invention provides coated sand with long shelf life and a production method of the coated sand. The coated sand is formed by silica sand, phenolic resin, a curing agent, a lubricant and boric acid, wherein 1-3 parts by weight of phenolic resin and 0.1-0.8 part by weight of boric acid are added in each 100 parts by weight of silica sand; the curing agent is urotropin, wherein 0.12-0.18 part by weight of urotropin is added in each one part by weight of phenolic resin; and the lubricant is calcium stearate, wherein 0.06-0.12 part by weight of calcium stearate is added in each one part by weight of phenolic resin. The production method comprises steps of heating silica sand to 100-130 DEG C; adding phenolic resin and boric acid into the obtained silica sand according to the proportion and mixing uniformly; adding urotropin into the obtained product according to the proportion and mixing uniformly; and adding calcium stearate into the obtained product according to the proportion and mixing uniformly.
Description
Technical field
The present invention relates to Modeling Material and production method thereof, especially relate to a kind of long shelf-life precoated sand and production method thereof.
Background technology
Precoated sand is sand grain surface promptly is covered with one deck hard resin film before moulding molding sand or a core sand.Two kinds of coating techniques of cold process and Re Fa are arranged: cold process with resin dissolves, and adds methenamine with ethanol in the mulling process, make the two be coated on sand grain surface, the ethanol volatilization, precoated sand; Hot method is preheating to uniform temperature to sand, adds resin and makes its fusion, stirs to make resin-coated at sand grain surface, adds the methenamine aqueous solution and lubricant, cooling, broken, sieve precoated sand.It is a kind of thermosetting resin sand the earliest, is invented in nineteen forty-four by German doctor Ke Ning.Its technical process is with the thermosetting phenolic resin of powdery and roughing sand mechanical mixture, solidifies during heating.Developed at present and added latent curing agent such as methenamine and lubricant such as calcium stearate with thermoplastic phenolic resins and be mixed with precoated sand through certain coating technique; When being heated, precoated sand is coated on the resin fusion of sand grain surface; Under the effect of the methylene that methenamine decomposites; The resin of fusion is transformed into the three-dimensional-structure of not fusion rapidly by linear structure, thereby precoated sand is solidified.Precoated sand is widely used in motor cylinder block, cylinder cap, inlet manifold, the production of various intricate castings such as all kinds of pipe fittings, the pump housing.
At present, the precoated sand of selling on the market, its fusing point are generally between 95 ℃～105 ℃, and such fusing point is in the winter time under the cryogenic conditions, generally can not lump in three months; And under the summer high temperature condition, one month even 10 days are less than just luming, and the shelf-life is short, and the serviceability of product is produced very big influence.Test shows, the fusing point that improves precoated sand helps prolonging its shelf-life, for example, when the fusing point of precoated sand reaches 110 ℃, in summer high temperature and moist environment, also can not lump in two months.How to improve the precoated sand fusing point, the shelf-life that prolongs precoated sand is the problem that the precoated sand technical field is eager to solve always.
At present; The way of the softening point through improving the used phenolic resins of precoated sand can improve the fusing point of precoated sand; After but the phenolic resins softening point improved, under the situation of same resin addition, its adhesion strength can reduce greatly; Cause precoated sand tension and bending strength not to reach technological requirement, need to increase amount of resin.Yet the increase amount of resin has not only increased the precoated sand production cost, and the phenolic resins in the precoated sand contains a small amount of harmful free phenol, and these phenol owing to be heated and can evaporate, produce flue gas in precoated sand production and use, endanger workers ' health.
In the past in precoated sand coremaking or modeling process, in order to accelerate the cross-linking reaction of phenolic resins and methenamine in the precoated sand, solidify as early as possible, enhance productivity, when producing precoated sand, often add some acidic materials as auxiliary agent.Mostly this type of material is organic acid, as: salicylic acid, benzoic acid, phthalic acid etc.Their affiliation that adds reduces the fusing point of precoated sand.
Summary of the invention
In order to overcome the defective of prior art; The technical problem that the present invention will solve is: a kind of long shelf-life precoated sand and production method thereof are provided; Through in producing the precoated sand process, adding a kind of material that can improve the overlay film melting point, produce a kind of precoated sand of growing the shelf-life.
In order to solve the problems of the technologies described above, on the one hand, the present invention provides a kind of long shelf-life precoated sand, and it is by comprising that silica sand, phenolic resins, curing agent, lubricant and boric acid processes; In wherein per 100 weight portion silica sands, add phenolic resins 1～3 weight portion, boric acid 0.1～0.8 weight portion; Said curing agent is a methenamine, and the phenolic resins of per 1 weight portion adds the methenamine of 0.12～0.18 weight portion; Said lubricant is a calcium stearate, and the phenolic resins of per 1 weight portion adds the calcium stearate of 0.06～0.12 weight portion.
On the other hand, the present invention also provides a kind of production method of growing the shelf-life precoated sand, and it may further comprise the steps:
S1: silica sand is heated to 100～130 ℃;
S2: in the silica sand that step S1 obtains, proportionally add phenolic resins and boric acid, mix;
S3: in the product that step S2 obtains, proportionally add methenamine, mix;
S4: in the product that step S3 obtains, proportionally add calcium stearate, mix.
Preferably, the production method of said long shelf-life precoated sand, the product that its step S4 obtains also passes through fragmentation.
The beneficial effect that the present invention brings: through adding the small amount of boron acid assistant, improve the fusing point of precoated sand, reduce the caking of precoated sand, thereby prolong its maintenance phase.
The specific embodiment
Illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.
Embodiment 1: the silica sand of 100 weight portions is heated to 100 ℃; In the silica sand that obtains, behind the boric acid of the phenolic resins of adding 1 weight portion and 0.1 weight portion, mix; In the product that obtains, mix add the aqueous solution of 0.18 weight portion methenamine by the phenolic resins of per 1 weight portion after; In the product that obtains, add the calcium stearate of 0.12 weight portion by the phenolic resins of per 1 weight portion after, mix, obtain long shelf-life precoated sand.
Embodiment 2: the silica sand of 100 weight portions is heated to 130 ℃; In the silica sand that obtains, behind the boric acid of the phenolic resins of adding 3 weight portions and 0.2 weight portion, mix; In the product that obtains, mix add the aqueous solution of 0.12 weight portion methenamine by the phenolic resins of per 1 weight portion after; In the product that obtains, add the calcium stearate of 0.06 weight portion by the phenolic resins of per 1 weight portion after, mix, obtain long shelf-life precoated sand.
Embodiment 3: the silica sand of 100 weight portions is heated to 115 ℃; In the silica sand that obtains, behind the boric acid of the phenolic resins of adding 2 weight portions and 0.3 weight portion, mix; In the product that obtains, mix add the aqueous solution of methenamine of 0.15 weight portion by the phenolic resins of per 1 weight portion after; In the product that obtains, add the calcium stearate of 0.09 weight portion by the phenolic resins of per 1 weight portion after, mix, obtain long shelf-life precoated sand after the fragmentation.
Embodiment 4: the silica sand of 100 weight portions is heated to 105 ℃; In the silica sand that obtains, behind the boric acid of the phenolic resins of adding 1.5 weight portions and 0.4 weight portion, mix; In the product that obtains, mix add the aqueous solution of methenamine of 0.16 weight portion by the phenolic resins of per 1 weight portion after; In the product that obtains, add the calcium stearate of 0.1 weight portion by the phenolic resins of per 1 weight portion after, mix, obtain long shelf-life precoated sand after the fragmentation.
Embodiment 5: the silica sand of 100 weight portions is heated to 110 ℃; In the silica sand that obtains, behind the boric acid of the phenolic resins of adding 2.5 weight portions and 0.5 weight portion, mix; In the product that obtains, mix add the aqueous solution of methenamine of 0.13 weight portion by the phenolic resins of per 1 weight portion after; In the product that obtains, add the calcium stearate of 0.08 weight portion by the phenolic resins of per 1 weight portion after, mix, obtain long shelf-life precoated sand.
Embodiment 6: the silica sand of 100 weight portions is heated to 125 ℃; In the silica sand that obtains, behind the boric acid of the phenolic resins of adding 2.6 weight portions and 0.6 weight portion, mix; In the product that obtains, mix add the aqueous solution of methenamine of 0.17 weight portion by the phenolic resins of per 1 weight portion after; In the product that obtains, add the calcium stearate of 0.11 weight portion by the phenolic resins of per 1 weight portion after, mix, obtain long shelf-life precoated sand.
Embodiment 7: the silica sand of 100 weight portions is heated to 120 ℃; In the silica sand that obtains, behind the boric acid of the phenolic resins of adding 2.3 weight portions and 0.8 weight portion, mix; In the product that obtains, mix add the aqueous solution of methenamine of 0.14 weight portion by the phenolic resins of per 1 weight portion after; In the product that obtains, add the calcium stearate of 0.07 weight portion by the phenolic resins of per 1 weight portion after, mix, obtain long shelf-life precoated sand.
Embodiment 8: the silica sand of 100 weight portions is heated to 122 ℃; In the silica sand that obtains, behind the boric acid of the phenolic resins of adding 2.7 weight portions and 1.0 weight portions, mix; In the product that obtains, mix add the aqueous solution of methenamine of 0.14 weight portion by the phenolic resins of per 1 weight portion after; In the product that obtains, add the calcium stearate of 0.08 weight portion by the phenolic resins of per 1 weight portion after, mix, obtain long shelf-life precoated sand after the fragmentation.
Comparative Examples: the silica sand of 100 weight portions is heated to 115 ℃; After in the silica sand that obtains, adding the phenolic resins of 2 weight portions, mix; In the product that obtains, mix add the aqueous solution of methenamine of 0.15 weight portion by the phenolic resins of per 1 weight portion after; In the product that obtains, add the calcium stearate of 0.09 weight portion by the phenolic resins of per 1 weight portion after, mix, obtain precoated sand.
Embodiment 1～8 and Comparative Examples products obtained therefrom are by JB/T 8583-2007 " precoated sand is used in casting " appendix A: cast the test method that must survey fusing point in the performance indications with precoated sand, the fusing point of measurement products.Through test, the fusing point such as the following table of embodiment 1～8 and Comparative Examples products obtained therefrom.
| Embodiment | Fusing point (℃) |
| Embodiment 1 | 104 |
| Embodiment 2 | 108 |
| Embodiment 3 | 110 |
| Embodiment 4 | 112 |
| Embodiment 5 | 115 |
| Embodiment 6 | 118 |
| Embodiment 7 | 120 |
| Embodiment 8 | 120 |
| Comparative Examples | 100 |
Test result shows: add boric acid when producing length shelf-life precoated sand, the fusing point of precoated sand is improved than Comparative Examples, explains that the adding of boric acid helps improving the fusing point of precoated sand, prolongs the maintenance phase of product.Yet it is in per 100 weight portion silica sands, when the addition of boric acid surpasses 0.8 weight portion, not obvious to the fusing point that improves precoated sand.
For a person skilled in the art, the present invention also has various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. one kind long shelf-life precoated sand is characterized in that: it is by comprising that silica sand, phenolic resins, curing agent, lubricant and boric acid processes; In wherein per 100 weight portion silica sands, add phenolic resins 1～3 weight portion, boric acid 0.1～0.8 weight portion; Said curing agent is a methenamine, and the phenolic resins of per 1 weight portion adds the methenamine of 0.12～0.18 weight portion; Said lubricant is a calcium stearate, and the phenolic resins of per 1 weight portion adds the calcium stearate of 0.06～0.12 weight portion.
2. the production method of the said long shelf-life precoated sand of claim 1, it is characterized in that: it may further comprise the steps:
S1: silica sand is heated to 100～130 ℃;
S2: in the silica sand that step S1 obtains, proportionally add phenolic resins and boric acid, mix;
S3: in the product that step S2 obtains, proportionally add methenamine, mix;
S4: in the product that step S3 obtains, proportionally add calcium stearate, mix.
3. according to the production method of the said long shelf-life precoated sand of claim 2, it is characterized in that: the product that said step S4 obtains also passes through fragmentation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102107856A CN102688979A (en) | 2012-06-26 | 2012-06-26 | Coated sand with long shelf life, and production method of coated sand |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102107856A CN102688979A (en) | 2012-06-26 | 2012-06-26 | Coated sand with long shelf life, and production method of coated sand |
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| Publication Number | Publication Date |
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| CN102688979A true CN102688979A (en) | 2012-09-26 |
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| CN2012102107856A Pending CN102688979A (en) | 2012-06-26 | 2012-06-26 | Coated sand with long shelf life, and production method of coated sand |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103658506A (en) * | 2013-12-31 | 2014-03-26 | 安顺学院 | Easy-to-fill precoated sand and preparation process thereof |
| CN104289661A (en) * | 2014-09-10 | 2015-01-21 | 湖北工业大学 | Preparation of coated sand by use of phosphate inorganic binder and molding method thereof |
| CN104325065A (en) * | 2014-10-08 | 2015-02-04 | 吴江市液铸液压件铸造有限公司 | Coated sand and preparation method thereof |
| CN104858357A (en) * | 2015-05-07 | 2015-08-26 | 马鞍山市恒毅机械制造有限公司 | Precoated sand with high-temperature resistance and good compactness and preparation method thereof |
| CN107695284A (en) * | 2017-10-10 | 2018-02-16 | 洪诗宏 | A kind of smoke-free and tasteless environment-friendly resin sand and its preparation technology |
| CN109047644A (en) * | 2018-09-28 | 2018-12-21 | 佛山齐安建筑科技有限公司 | A kind of preparation method of high-performance precoated sand |
| WO2019015044A1 (en) * | 2017-07-19 | 2019-01-24 | 南通国盛铸造有限公司 | High-performance low-cost crystrip for use with gray cast iron parts of machine tool |
| CN110102704A (en) * | 2019-05-28 | 2019-08-09 | 沙县宏盛塑料有限公司 | A kind of modification phenolic resin-based precoated sand and preparation method thereof |
| CN110102703A (en) * | 2019-05-07 | 2019-08-09 | 秦声旺 | A kind of novel environment friendly smoke-free and tasteless precoated sand and preparation method thereof |
| CN112692226A (en) * | 2020-12-09 | 2021-04-23 | 南昌科勒有限公司 | Hot core box resin sand and resin sand core comprising same |
| CN115971405A (en) * | 2022-12-05 | 2023-04-18 | 常熟东南塑料有限公司 | Modified phenolic resin precoated sand and preparation method thereof |
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| CN102448637A (en) * | 2009-07-23 | 2012-05-09 | 旭有机材工业株式会社 | Phenol resin composition for shell molding, resin-coated sand for shell molding, and mold for shell molding obtained using same |
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| JPH11309543A (en) * | 1998-04-22 | 1999-11-09 | Gun Ei Chem Ind Co Ltd | Resin-coated sand for shell molding |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103658506B (en) * | 2013-12-31 | 2016-03-30 | 安顺学院 | Easy filling precoated sand and preparation technology thereof |
| CN103658506A (en) * | 2013-12-31 | 2014-03-26 | 安顺学院 | Easy-to-fill precoated sand and preparation process thereof |
| CN104289661A (en) * | 2014-09-10 | 2015-01-21 | 湖北工业大学 | Preparation of coated sand by use of phosphate inorganic binder and molding method thereof |
| CN104325065A (en) * | 2014-10-08 | 2015-02-04 | 吴江市液铸液压件铸造有限公司 | Coated sand and preparation method thereof |
| CN104858357A (en) * | 2015-05-07 | 2015-08-26 | 马鞍山市恒毅机械制造有限公司 | Precoated sand with high-temperature resistance and good compactness and preparation method thereof |
| WO2019015044A1 (en) * | 2017-07-19 | 2019-01-24 | 南通国盛铸造有限公司 | High-performance low-cost crystrip for use with gray cast iron parts of machine tool |
| CN107695284A (en) * | 2017-10-10 | 2018-02-16 | 洪诗宏 | A kind of smoke-free and tasteless environment-friendly resin sand and its preparation technology |
| CN109047644A (en) * | 2018-09-28 | 2018-12-21 | 佛山齐安建筑科技有限公司 | A kind of preparation method of high-performance precoated sand |
| CN110102703A (en) * | 2019-05-07 | 2019-08-09 | 秦声旺 | A kind of novel environment friendly smoke-free and tasteless precoated sand and preparation method thereof |
| CN110102704A (en) * | 2019-05-28 | 2019-08-09 | 沙县宏盛塑料有限公司 | A kind of modification phenolic resin-based precoated sand and preparation method thereof |
| CN110102704B (en) * | 2019-05-28 | 2020-12-18 | 沙县宏盛塑料有限公司 | Modified phenolic resin-based precoated sand and preparation method thereof |
| CN112692226A (en) * | 2020-12-09 | 2021-04-23 | 南昌科勒有限公司 | Hot core box resin sand and resin sand core comprising same |
| CN115971405A (en) * | 2022-12-05 | 2023-04-18 | 常熟东南塑料有限公司 | Modified phenolic resin precoated sand and preparation method thereof |
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Application publication date: 20120926 |