CN105964927A - Diatomite-EVA emulsion composite water-soluble mold core and preparation method thereof - Google Patents
Diatomite-EVA emulsion composite water-soluble mold core and preparation method thereof Download PDFInfo
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- CN105964927A CN105964927A CN201610090133.1A CN201610090133A CN105964927A CN 105964927 A CN105964927 A CN 105964927A CN 201610090133 A CN201610090133 A CN 201610090133A CN 105964927 A CN105964927 A CN 105964927A
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- water
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- eva emulsion
- kieselguhr
- soluble
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/105—Salt cores
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Medicinal Preparation (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses a diatomite-EVA emulsion composite water-soluble mold core. The water-soluble mold core comprises the following raw materials in parts by weight: 30-40 parts of diatomite, 10-15 parts of talcum powder, 1-2 parts of calcium sulfate whisker, 5-10 parts of sodium chloride, 2-4 parts of an EVA emulsion with solid content being 45-55%, 5-10 parts of soluble glass, 0.1-0.15 parts of aluminium isopropoxide, 0.5-1 part of polyvinylpyrrolidone, 1-2 parts of maltodextrin, 0.1-0.2 parts of polyoxyethylene sorbitan monooleate, and 10-15 parts of a bonding auxiliary agent. The water-soluble mold core has the advantages of good intensity, size stability, low hygroscopicity, good toughness, difficult generation of cracks and defects, good water soluble collapsibility, easy cleaning, environment protection, and high practical value.
Description
Technical field
The present invention relates to casting technology field, particularly relate to a kind of kieselguhr-EVA emulsion and be combined water-soluble core and preparation method thereof.
Background technology
There is a large amount of component in process industry, its inwall is thin-wall complicated structure, and partial lumen is almost closed, and have is connected.At present conventional resin core, the collapsibility performance such as metal-cored are poor, and casting pouring rear interior cavity is difficult to clean up, and affects fineness and the dimensional accuracy of foundry goods inner surface, it is impossible to meet the demand of this type of cast casting.Therefore, high performance water-soluble core is developed the most necessary.
Water-soluble core refers to water-soluble material as binding agent and adds filler, the core then made by different molding modes such as cast, compacting sintering molding.After casting pouring, this core can dissolve defeated and dispersed in water, reaches to clear up the effect of core.Water-soluble core has does not gets angry, it is possible to decrease the feature such as casting defect, easy removing, does not damage foundry goods during cleaning, is particularly suited for complicated inner cavity and the foundry goods in bending duct.Further, water-soluble core is easily recycled, energy-conserving and environment-protective, is a kind of relatively advanced core-making technique, has good application prospect.At present, the combination property of water-soluble core is the best, remains the defects such as cracking poor at core strength, yielding, water-soluble collapsibility be undesirable, therefore limits it and extensively apply.
Summary of the invention
The object of the invention is contemplated to make up the defect of prior art, it is provided that a kind of high intensity, low moisture absorption, kieselguhr-EVA emulsion that cracking resistance is good are combined water-soluble core and preparation method thereof.
The present invention is achieved by the following technical solutions:
A kind of kieselguhr-EVA emulsion is combined water-soluble core, and it is to be prepared by the raw material of following weight parts:
Kieselguhr 30-40, Pulvis Talci 10-15, calcium sulfate crystal whiskers 1-2, sodium chloride 5-10, solid content is EVA emulsion 2-4 of 45-55%, waterglass 5-10, aluminum isopropylate. 0.1-0.15, polyvinylpyrrolidone 0.5-1, maltodextrin 1-2, polyoxyethylene sorbitan monooleate dehydration 0.1-0.2, adhesive aid 10-15；
Described adhesive aid is prepared by the raw materials in: guar gum 3-5, acrylic acid 0.5-1, alkenyl succinic anhydride 0.3-0.5, Ammonium persulfate. 0.01-0.015, calcium lignosulfonate 1-2, Silane coupling reagent KH-570 0.1-0.2, water 40-60；The preparation method of adhesive aid is that guar gum, alkenyl succinic anhydride and calcium lignosulfonate are added to the water 80-90 DEG C of stirring 1-2h, is subsequently adding remaining raw material 60-70 DEG C, 1000-1500r/min stirs 1-2h, after cooling and get final product.
A kind of kieselguhr-EVA emulsion is combined the preparation method of water-soluble core, comprises the following steps:
(1) raw material is weighed by weight, first kieselguhr, Pulvis Talci, calcium sulfate crystal whiskers, waterglass and sodium chloride are added jointly batch mixer mixed at high speed 10-15min, then sinters 1-2h in 600-700 DEG C, after cooling, be ground to 200-300 mesh, it is subsequently adding EVA emulsion mix homogeneously, obtains component A；
(2) aluminum isopropylate. is added in the water of 60-80 times of weight, add polyoxyethylene sorbitan monooleate dehydration after pH is adjusted to 3-4 and stir 2-4h in 85-95 DEG C, then temperature be adjusted to 40-60 DEG C and add remaining raw material stirring 1-2h, after cooling, obtaining B component；
(3) component A and B component are added mixed at high speed 10-20min after batch mixer, then it is loaded in mould compacting, treats its curing and demolding, at 200-250 DEG C, dry 12-24h, finally according to needs, its profile is carried out machining, obtain kieselguhr-EVA emulsion and be combined water-soluble core.
The invention have the advantage that
The present invention is by guar gum, alkenyl succinic anhydride, acrylic acid, compounding and the molding of reaction prepared adhesive aid, beneficially core between calcium lignosulfonate and Silane coupling reagent KH-570, and can be effectively improved tensile property and the resistance to water soak of core；Kieselguhr has good dispersibility and wearability, EVA emulsion has good toughness and adhesive property, by the compounding of the raw materials such as kieselguhr, EVA emulsion and processing, make the water-soluble core prepared have good intensity, stability and agent of low hygroscopicity, good toughness, be not susceptible to cracking, defect, water-soluble collapsibility is good, being prone to remove, environmental protection, practical value is high.
Detailed description of the invention
A kind of kieselguhr-EVA emulsion is combined water-soluble core, and it is to be prepared by the raw material of following weight parts:
Kieselguhr 30, Pulvis Talci 10, calcium sulfate crystal whiskers 1, sodium chloride 5, solid content is the EVA emulsion 2 of 45%, waterglass 5, aluminum isopropylate. 0.1, polyvinylpyrrolidone 0.5, maltodextrin 1, polyoxyethylene sorbitan monooleate dehydration 0.1, adhesive aid 10；
Described adhesive aid is prepared by the raw materials in: guar gum 3, acrylic acid 0.5, alkenyl succinic anhydride 0.3, Ammonium persulfate. 0.01, calcium lignosulfonate 1, Silane coupling reagent KH-570 0.1, water 40；The preparation method of adhesive aid is that guar gum, alkenyl succinic anhydride and calcium lignosulfonate are added to the water 80 DEG C of stirring 1h, is subsequently adding remaining raw material 60 DEG C, 1000r/min stirs 1h, after cooling and get final product.
A kind of kieselguhr-EVA emulsion is combined the preparation method of water-soluble core, comprises the following steps:
(1) raw material is weighed by weight, first kieselguhr, Pulvis Talci, calcium sulfate crystal whiskers, waterglass and sodium chloride are added jointly batch mixer mixed at high speed 10min, then sinters 1h in 600 DEG C, after cooling, be ground to 200 mesh, it is subsequently adding EVA emulsion mix homogeneously, obtains component A；
(2) aluminum isopropylate. is added in the water of 60 times of weight, add polyoxyethylene sorbitan monooleate dehydration after pH is adjusted to 3 and stir 2h in 85 DEG C, then temperature be adjusted to 40 DEG C and add remaining raw material stirring 1h, after cooling, obtaining B component；
(3) component A and B component are added mixed at high speed 10min after batch mixer, then it is loaded in mould compacting, treats its curing and demolding, at 200 DEG C, dry 12h, finally according to needs, its profile is carried out machining, obtain kieselguhr-EVA emulsion and be combined water-soluble core.
Through inspection, above-mentioned prepared water-soluble core performance is as follows:
Tensile strength: 7.0MPa；
Collapsibility performance: complete defeated and dispersed time≤10min in water；
Anti-moisture absorption property: place 24h under conditions of air humidity 80%, tensile strength reduces by 3.9%.
Claims (2)
1. a kieselguhr-EVA emulsion is combined water-soluble core, it is characterised in that it is to be prepared by the raw material of following weight parts:
Kieselguhr 30-40, Pulvis Talci 10-15, calcium sulfate crystal whiskers 1-2, sodium chloride 5-10, solid content is EVA emulsion 2-4 of 45-55%, waterglass 5-10, aluminum isopropylate. 0.1-0.15, polyvinylpyrrolidone 0.5-1, maltodextrin 1-2, polyoxyethylene sorbitan monooleate dehydration 0.1-0.2, adhesive aid 10-15；
Described adhesive aid is prepared by the raw materials in: guar gum 3-5, acrylic acid 0.5-1, alkenyl succinic anhydride 0.3-0.5, Ammonium persulfate. 0.01-0.015, calcium lignosulfonate 1-2, Silane coupling reagent KH-570 0.1-0.2, water 40-60；The preparation method of adhesive aid is that guar gum, alkenyl succinic anhydride and calcium lignosulfonate are added to the water 80-90 DEG C of stirring 1-2h, is subsequently adding remaining raw material 60-70 DEG C, 1000-1500r/min stirs 1-2h, after cooling and get final product.
A kind of kieselguhr-EVA emulsion the most according to claim 1 is combined the preparation method of water-soluble core, it is characterised in that comprise the following steps:
(1) raw material is weighed by weight, first kieselguhr, Pulvis Talci, calcium sulfate crystal whiskers, waterglass and sodium chloride are added jointly batch mixer mixed at high speed 10-15min, then sinters 1-2h in 600-700 DEG C, after cooling, be ground to 200-300 mesh, it is subsequently adding EVA emulsion mix homogeneously, obtains component A；
(2) aluminum isopropylate. is added in the water of 60-80 times of weight, add polyoxyethylene sorbitan monooleate dehydration after pH is adjusted to 3-4 and stir 2-4h in 85-95 DEG C, then temperature be adjusted to 40-60 DEG C and add remaining raw material stirring 1-2h, after cooling, obtaining B component；
(3) component A and B component are added mixed at high speed 10-20min after batch mixer, then it is loaded in mould compacting, treats its curing and demolding, at 200-250 DEG C, dry 12-24h, finally according to needs, its profile is carried out machining, obtain kieselguhr-EVA emulsion and be combined water-soluble core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610090133.1A CN105964927A (en) | 2016-02-18 | 2016-02-18 | Diatomite-EVA emulsion composite water-soluble mold core and preparation method thereof |
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| CN201610090133.1A CN105964927A (en) | 2016-02-18 | 2016-02-18 | Diatomite-EVA emulsion composite water-soluble mold core and preparation method thereof |
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| CN105964927A true CN105964927A (en) | 2016-09-28 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101073819A (en) * | 2007-06-22 | 2007-11-21 | 华中科技大学 | Soluble salt element for high-pressure casting |
| CN101269401A (en) * | 2008-05-13 | 2008-09-24 | 西安康博新材料科技有限公司 | Highly tenacious soluble composite material salt core and production method |
| CN101869963A (en) * | 2010-07-06 | 2010-10-27 | 湖南江滨机器（集团）有限责任公司 | Foundry water-soluble composite salt core material, salt core preparation method and prepared salt core |
| CN102153972A (en) * | 2011-05-23 | 2011-08-17 | 中国一拖集团有限公司 | Normal temperature quick-drying adhesive for assembling and installing complex kenel and preparation method |
| CN102786295A (en) * | 2012-08-06 | 2012-11-21 | 江苏大学 | Water-soluble ceramic core and preparation method thereof |
| CN103567356A (en) * | 2013-10-11 | 2014-02-12 | 铜陵市经纬流体科技有限公司 | Sodium silicate sand with high wet-compressive strength and preparation method thereof |
| CN104475685A (en) * | 2014-11-14 | 2015-04-01 | 华中科技大学 | Preparation method of water-soluble sand core used for aluminium alloy or magnesium alloy thin wall complex casting |
| CN104646593A (en) * | 2013-11-19 | 2015-05-27 | 朱华 | Process for preparing soluble composite salt core |
-
2016
- 2016-02-18 CN CN201610090133.1A patent/CN105964927A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101073819A (en) * | 2007-06-22 | 2007-11-21 | 华中科技大学 | Soluble salt element for high-pressure casting |
| CN101269401A (en) * | 2008-05-13 | 2008-09-24 | 西安康博新材料科技有限公司 | Highly tenacious soluble composite material salt core and production method |
| CN101869963A (en) * | 2010-07-06 | 2010-10-27 | 湖南江滨机器（集团）有限责任公司 | Foundry water-soluble composite salt core material, salt core preparation method and prepared salt core |
| CN102153972A (en) * | 2011-05-23 | 2011-08-17 | 中国一拖集团有限公司 | Normal temperature quick-drying adhesive for assembling and installing complex kenel and preparation method |
| CN102786295A (en) * | 2012-08-06 | 2012-11-21 | 江苏大学 | Water-soluble ceramic core and preparation method thereof |
| CN103567356A (en) * | 2013-10-11 | 2014-02-12 | 铜陵市经纬流体科技有限公司 | Sodium silicate sand with high wet-compressive strength and preparation method thereof |
| CN104646593A (en) * | 2013-11-19 | 2015-05-27 | 朱华 | Process for preparing soluble composite salt core |
| CN104475685A (en) * | 2014-11-14 | 2015-04-01 | 华中科技大学 | Preparation method of water-soluble sand core used for aluminium alloy or magnesium alloy thin wall complex casting |
Non-Patent Citations (1)
| Title |
|---|
| 叶久新等: "《熔模精铸工艺指南》", 30 June 2006, 湖南科学技术出版社 * |
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Application publication date: 20160928 |
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