CN111250647B - Binder for casting and application thereof - Google Patents
Binder for casting and application thereof Download PDFInfo
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- CN111250647B CN111250647B CN202010061967.6A CN202010061967A CN111250647B CN 111250647 B CN111250647 B CN 111250647B CN 202010061967 A CN202010061967 A CN 202010061967A CN 111250647 B CN111250647 B CN 111250647B
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- phosphate
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- polyacrylic acid
- acid
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- 239000011230 binding agent Substances 0.000 title claims abstract description 28
- 238000005266 casting Methods 0.000 title claims abstract description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 89
- 239000004584 polyacrylic acid Substances 0.000 claims abstract description 41
- 229920002125 Sokalan® Polymers 0.000 claims abstract description 37
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 22
- 239000010452 phosphate Substances 0.000 claims abstract description 22
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 16
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 12
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000000853 adhesive Substances 0.000 claims abstract description 7
- 230000001070 adhesive effect Effects 0.000 claims abstract description 7
- 239000000470 constituent Substances 0.000 claims abstract 2
- 239000004576 sand Substances 0.000 claims description 39
- 239000003999 initiator Substances 0.000 claims description 33
- 238000010438 heat treatment Methods 0.000 claims description 32
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 30
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 238000006243 chemical reaction Methods 0.000 claims description 24
- 238000004321 preservation Methods 0.000 claims description 24
- 238000005303 weighing Methods 0.000 claims description 21
- 238000002156 mixing Methods 0.000 claims description 17
- 235000012239 silicon dioxide Nutrition 0.000 claims description 13
- 238000012986 modification Methods 0.000 claims description 12
- 230000004048 modification Effects 0.000 claims description 12
- 239000004327 boric acid Substances 0.000 claims description 9
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 8
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 8
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 6
- 239000003110 molding sand Substances 0.000 claims description 5
- 229910021488 crystalline silicon dioxide Inorganic materials 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 2
- 235000006408 oxalic acid Nutrition 0.000 claims description 2
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims description 2
- 150000003013 phosphoric acid derivatives Chemical class 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 239000012266 salt solution Substances 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 239000000243 solution Substances 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 238000003786 synthesis reaction Methods 0.000 claims description 2
- 229910021486 amorphous silicon dioxide Inorganic materials 0.000 claims 1
- 239000002085 irritant Substances 0.000 abstract description 3
- 231100000021 irritant Toxicity 0.000 abstract description 3
- 101000623895 Bos taurus Mucin-15 Proteins 0.000 description 12
- 238000009991 scouring Methods 0.000 description 12
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 10
- 229910021538 borax Inorganic materials 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000004328 sodium tetraborate Substances 0.000 description 6
- 235000010339 sodium tetraborate Nutrition 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 5
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 5
- 238000005201 scrubbing Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229910002026 crystalline silica Inorganic materials 0.000 description 3
- QQFLQYOOQVLGTQ-UHFFFAOYSA-L magnesium;dihydrogen phosphate Chemical compound [Mg+2].OP(O)([O-])=O.OP(O)([O-])=O QQFLQYOOQVLGTQ-UHFFFAOYSA-L 0.000 description 3
- 229910000401 monomagnesium phosphate Inorganic materials 0.000 description 3
- 235000019785 monomagnesium phosphate Nutrition 0.000 description 3
- 239000011863 silicon-based powder Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- -1 boric acid modified phosphate Chemical class 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- RGPUVZXXZFNFBF-UHFFFAOYSA-K diphosphonooxyalumanyl dihydrogen phosphate Chemical compound [Al+3].OP(O)([O-])=O.OP(O)([O-])=O.OP(O)([O-])=O RGPUVZXXZFNFBF-UHFFFAOYSA-K 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000007849 furan resin Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002492 water-soluble polymer binding agent Substances 0.000 description 1
- MFXMOUUKFMDYLM-UHFFFAOYSA-L zinc;dihydrogen phosphate Chemical compound [Zn+2].OP(O)([O-])=O.OP(O)([O-])=O MFXMOUUKFMDYLM-UHFFFAOYSA-L 0.000 description 1
Classifications
-
- 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
- B22C1/167—Mixtures of inorganic and organic binding agents
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention relates to a binder for casting and application thereof. The binder for casting comprises the components
Polyacrylic acid, component phosphate and component
Silicon dioxide, as component
The mass of polyacrylic acid is taken as a reference, and the components
Phosphate is a component
The polyacrylic acid comprises the following components in percentage by mass: 0% -30%; components
Silicon dioxide as a constituent
Description
Technical Field
The invention relates to the field of casting molding materials, in particular to a binder for casting and application thereof.
Background
In the casting production, the heating hardening core making is a core making method that liquid resin and raw sand are mixed uniformly and injected into a metal core box at a certain temperature, and a binder can be condensed and hardened in a short time. The resin is widely used up to now, but the used resin is furan resin, phenolic resin and the like, although the resin has high use strength, smoke and pungent smell are generated in the casting production process, the working environment is polluted, the temperature range for realizing hardening is narrow, and the temperature control requirement is strict. Xuzhengda et al, university of China's science and technology, published ' polyacrylate binder sand warm-box core-making technology ' in ' hot working technology ', developed a polyacrylate resin binder and a curing agent adapted to the same, successfully applied to the warm-box core-making technology, but the heating time is long, the normal temperature strength is low, and the normal temperature strength is only 1.1-1.2 MPa. At present, no environment-friendly adhesive with high strength, wide hardening temperature range and high hardening speed exists.
Disclosure of Invention
The purpose of the invention is as follows:
the invention provides an adhesive for casting and application thereof, aiming at solving the technical problems and providing an adhesive which has wide curing temperature range, high curing strength and no irritant gas generation in the curing process.
The technical scheme is as follows:
the binder for casting comprises polyacrylic acid as a component I, phosphate as a component II and silicon dioxide as a component III, wherein the phosphate as the component II accounts for the polyacrylic acid as the component I by mass percent based on the mass of the polyacrylic acid as the component I: 0% -30%; the component III, silicon dioxide, accounts for the polyacrylic acid of the component I by mass percent: 0 to 50 percent.
The polyacrylic acid of the component I is polymerized by water, acrylic acid and an initiator, and comprises the following raw materials in percentage by mass:
acrylic acid 13% -26%;
73.57% -86.63% of water;
0.37 to 0.43 percent of initiator.
The acrylic acid is colorless liquid, and the initiator is one or more of persulfate.
The component I polyacrylic acid is prepared by the following steps of weighing acrylic acid, water and an initiator according to the mass ratio, stirring and mixing the water and the initiator, heating to 70-95 ℃, fully dissolving the initiator, adding the acrylic acid, carrying out heat preservation reaction for 5-70 min, introducing boric acid or borate in the heat preservation reaction process for modification, cooling and discharging for later use.
Component II phosphate refers to a phosphate solution produced by chemical synthesis of phosphoric acid and an alkaline oxide or hydroxide.
The phosphate of the component II is a phosphate single salt or a phosphate double salt solution.
The phosphate of the component II is modified into modified phosphate by boric acid, citric acid or oxalic acid.
The silicon dioxide of the component III is one or more of crystalline silicon dioxide, non-crystalline silicon dioxide, silicon micropowder, micro silicon powder, surface modified silicon dioxide or mineral substances taking silicon dioxide as a main component.
The application of the binder for casting and the application of the binder for casting to prepare molding sand.
Weighing polyacrylic acid of a component I, which accounts for 2.0-3.0% of the weight of the raw sand, weighing phosphate of a component II and silicon dioxide of a component III according to the mass percentage, premixing the weighed phosphate of the component II and the silicon dioxide of the component III with the raw sand for 40-60 s, adding the weighed polyacrylic acid of the component I, and mixing the sand and making a core; in the heating hardening core making process, the temperature of the core box is 100-250 ℃, and the heating time is 1-4 min.
The advantages and effects are as follows:
the invention researches a binder for casting, which is suitable for heating and hardening, does not contain harmful substances such as phenol, formaldehyde and the like, has wide hardening temperature application range and high hardening speed, prepares a sand core with high strength, does not discharge toxic and harmful substances in the pouring process, and is an environment-friendly binder system for casting.
The invention develops the binder which has wide hardening temperature range, high strength and no irritant gas generation in the hardening process, and solves the defects of the hot core box method and the warm core box method.
The casting binder provided by the invention is odorless, tasteless and nontoxic water-soluble polymer binder, and has high tensile strength and good collapsibility when being applied to a heating hardening core making process.
The polyacrylic acid adhesive for casting prepared by the invention is applied to practical production, no toxic and harmful gas is emitted in the production and use processes, and the mixed molding sand has good fluidity, high core strength and good collapsibility.
The adhesive is applied to a heating hardening core making process, and the prepared 8-shaped sample has higher tensile strength, the instant strength is more than or equal to 0.5MPa, and the normal-temperature tensile strength of the sample is more than or equal to 1.5 MPa.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The preparation of the molding sand comprises a binder for casting and raw sand, wherein the raw sand is scrubbing sand of a big forest. The strength, gas evolution and other measurement methods of the prepared molding sand are measured according to GB/T2684-2009 sand and mixture test method for casting.
Example 1:
preparing polyacrylic acid of component I: the ingredients of water 79.6%, acrylic acid 20% and potassium persulfate 0.4% were weighed out separately. Respectively adding weighed water and an initiator into a three-neck flask with a stirrer, starting the stirrer to fully dissolve the initiator when the heating temperature of the three-neck flask rises to 80 ℃, adding weighed acrylic acid, and carrying out heat preservation reaction for 20 min. Modification can be carried out by introducing 1.6% of boric acid during the heat preservation reaction.
Weighing 13.3 percent of component II aluminum dihydrogen phosphate by weight of component I, weighing 13.3 percent of component III crystal type silicon dioxide by weight of component I, premixing the component III crystal type silicon dioxide with the Dahlin scouring sand for 60s, then adding 3.0 percent of component I polyacrylic acid by weight of the Dahlin scouring sand, mixing the sand and making a core, heating and hardening at 150 ℃ for 3min, and preparing an 8-shaped sample. The immediate tensile strength of the 8-shaped sample sand core is measured to be 0.64MPa, and the normal-temperature tensile strength is measured to be 2.06 MPa. The gas evolution is 7.4ml/g, and the high-temperature residual strength is 0 MPa.
Example 2:
preparing polyacrylic acid of component I: the components, water 76.6%, acrylic acid 23% and ammonium persulfate 0.4% are respectively weighed. Respectively adding weighed water and an initiator into a three-neck flask with a stirrer, starting the stirrer to fully dissolve the initiator when the heating temperature of the three-neck flask rises to 90 ℃, adding weighed acrylic acid, and carrying out heat preservation reaction for 35 min. The modification can be carried out by introducing 1.6 percent of borax in the heat preservation reaction process.
Weighing 13.3 wt% of component I, namely 13.3 wt% of component II, and 20 wt% of component I, namely micro silicon powder and raw sand, premixing for 60s, then adding 3.0 wt% of polyacrylic acid binder of scrubbing sand of the forest, mixing sand and making a core, heating and hardening at 120 ℃ for 4min, and preparing an 8-shaped sample. The immediate tensile strength of the 8-shaped sample sand core is measured to be 0.64MPa, and the normal-temperature tensile strength is measured to be 1.87 MPa. The gas evolution is 8.0ml/g, and the high-temperature residual strength is 0.04 MPa.
Example 3:
preparing polyacrylic acid of component I: the components, water 79.6%, acrylic acid 20% and ammonium persulfate 0.4% are respectively weighed. Respectively adding weighed water and an initiator into a three-neck flask with a stirrer, starting the stirrer to fully dissolve the initiator when the heating temperature of the three-neck flask rises to 85 ℃, adding weighed acrylic acid, and carrying out heat preservation reaction for 10 min. Modification can be carried out by introducing 1.6% of boric acid during the heat preservation reaction.
Weighing 20 wt% of component I, namely boric acid modified phosphate of component II, 6.7 wt% of component I, namely silicon micropowder of component III, and Dahlin scouring sand, premixing for 60s, then adding 3.0 wt% of component I, namely polyacrylic acid, of the Dahlin scouring sand, and mixing sand to prepare a core. Heating and hardening temperature is 200 ℃, time is 1.5min, and 8-shaped samples are prepared. The instant tensile strength of the 8-shaped sample sand core is measured to be 0.81MPa, and the normal-temperature tensile strength is measured to be 2.15 MPa. The gas evolution is 7.0ml/g, and the high-temperature residual strength is 0 MPa.
Example 4:
preparing polyacrylic acid of component I: the components, water 76.6%, acrylic acid 23% and potassium persulfate 0.4% were weighed out separately. Respectively adding weighed water and an initiator into a three-neck flask with a stirrer, starting the stirrer to fully dissolve the initiator when the heating temperature of the three-neck flask rises to 95 ℃, adding weighed acrylic acid, and carrying out heat preservation reaction for 50 min. The modification can be carried out by introducing 1.6 percent of borax in the heat preservation reaction process.
Weighing 13.3 wt% of component I, magnesium dihydrogen phosphate II, 20 wt% of component I, amorphous silica III and Dahlin scouring sand, premixing for 60s, adding 3.0 wt% of component I, polyacrylic acid, and mixing to make core. Heating and hardening temperature is 180 ℃, time is 2min, and 8-shaped samples are prepared. The immediate tensile strength of the 8-shaped sample sand core is measured to be 0.62MPa, and the normal-temperature tensile strength is measured to be 1.7 MPa. The gas evolution is 6.2ml/g, and the high-temperature residual strength is 0.03 MPa.
Example 5:
preparing polyacrylic acid of component I: the components, water 73.57%, acrylic acid 26% and ammonium persulfate 0.43% are respectively weighed. Respectively adding weighed water and an initiator into a three-neck flask with a stirrer, starting the stirrer to fully dissolve the initiator when the heating temperature of the three-neck flask rises to 70 ℃, adding weighed acrylic acid, and carrying out heat preservation reaction for 70 min. Modification can be carried out by introducing 1.6% of boric acid during the heat preservation reaction.
Weighing the component III crystalline silica accounting for 30 percent of the weight of the component I, premixing the component III crystalline silica with the Dahlin scouring sand for 60s, then adding the component I polyacrylic acid accounting for 2.0 percent of the weight of the Dahlin scouring sand, and mixing the sand to prepare the core. Heating and hardening temperature is 250 ℃, time is 1min, and 8-shaped samples are prepared. The immediate tensile strength of the 8-shaped sample sand core is measured to be 0.42MPa, and the normal-temperature tensile strength is measured to be 1.67 MPa. The gas evolution is 8.3ml/g, and the high-temperature residual strength is 0.02 MPa.
Example 6:
preparing polyacrylic acid of component I: the components, water 86.63%, acrylic acid 13% and potassium persulfate 0.37% were weighed out separately. Respectively adding weighed water and an initiator into a three-neck flask with a stirrer, starting the stirrer to fully dissolve the initiator when the heating temperature of the three-neck flask rises to 95 ℃, adding weighed acrylic acid, and carrying out heat preservation reaction for 5 min. Modification can be carried out by introducing 1.6% of boric acid during the heat preservation reaction.
Weighing 50 wt% of component I, premixing the surface modified silicon dioxide of component III with Dahlin scouring sand for 60s, adding 2.5 wt% of component I polyacrylic acid of Dahlin scouring sand, and mixing sand to prepare a core. Heating and hardening temperature is 100 ℃, time is 4min, and 8-shaped samples are prepared. The immediate tensile strength of the 8-shaped sample sand core is measured to be 0.55MPa, and the normal-temperature tensile strength is measured to be 1.50 MPa. The gas evolution is 7.2ml/g, and the high-temperature residual strength is 0.04 MPa.
Example 7:
preparing polyacrylic acid of component I: the components, water 76.6%, acrylic acid 23%, ammonium persulfate 0.1% and potassium persulfate 0.3%, were weighed out separately. Respectively adding weighed water and an initiator into a three-neck flask with a stirrer, starting the stirrer to fully dissolve the initiator when the heating temperature of the three-neck flask rises to 95 ℃, adding weighed acrylic acid, and carrying out heat preservation reaction for 50 min. The modification can be carried out by introducing 1.6 percent of borax in the heat preservation reaction process.
Weighing 15 wt% of component I, mixing the component II with citric acid modified phosphate, 30 wt% of component I, quartz and Dahlin scouring sand, premixing for 60s, adding 3.0 wt% of polyacrylic acid binder, and mixing to make core. Heating and hardening temperature is 180 ℃, time is 2min, and 8-shaped samples are prepared. The immediate tensile strength of the 8-shaped sample sand core is measured to be 0.89MPa, and the normal-temperature tensile strength is measured to be 2.38 MPa. The gas evolution was 7.4ml/g, and the high-temperature residual strength was 0.04 MPa.
Example 8:
preparing polyacrylic acid of component I: the components, water 76.6%, acrylic acid 23% and ammonium persulfate 0.4% are respectively weighed. Respectively adding weighed water and an initiator into a three-neck flask with a stirrer, starting the stirrer to fully dissolve the initiator when the heating temperature of the three-neck flask rises to 95 ℃, adding weighed acrylic acid, and carrying out heat preservation reaction for 50 min. The modification can be carried out by introducing 1.6 percent of borax in the heat preservation reaction process.
Weighing a mixed solution of zinc dihydrogen phosphate and magnesium dihydrogen phosphate of a component II with the weight of 13.3 percent of the component I, non-crystalline silicon dioxide of a component III with the weight of 20 percent of the component I, micro silicon powder with the weight of 10 percent and Dahlin scouring sand, premixing for 50s, adding polyacrylic acid of the component I with the weight of 3.0 percent of the Dahlin scouring sand, and mixing the sand and making a core. Heating and hardening temperature is 180 ℃, time is 2min, and 8-shaped samples are prepared. The immediate tensile strength of the 8-shaped sample sand core is measured to be 0.82MPa, and the normal-temperature tensile strength is measured to be 2.21 MPa. The gas evolution is 7.0ml/g, and the high-temperature residual strength is 0.03 MPa.
Example 9:
preparing polyacrylic acid of component I: the components, water 76.6%, acrylic acid 23% and potassium persulfate 0.4% were weighed out separately. Respectively adding weighed water and an initiator into a three-neck flask with a stirrer, starting the stirrer to fully dissolve the initiator when the heating temperature of the three-neck flask rises to 95 ℃, adding weighed acrylic acid, and carrying out heat preservation reaction for 50 min. The modification can be carried out by introducing 1.6 percent of borax in the heat preservation reaction process.
Weighing 13.3 wt% of component I, magnesium dihydrogen phosphate II, 20 wt% of component I, crystalline silica III and raw sand, premixing for 40s, adding 3.0 wt% of component I, polyacrylic acid, and mixing to make core. Heating and hardening temperature is 180 ℃, time is 2min, and 8-shaped samples are prepared. The instant tensile strength of the 8-shaped sample sand core is measured to be 0.75MPa, and the normal-temperature tensile strength is measured to be 1.98 MPa. The gas evolution is 7.1ml/g, and the high-temperature residual strength is 0.03 MPa.
Comparative example 10:
formulation component I polyacrylic acid: the components, water 76.6%, acrylic acid 23% and initiator 0.4% are respectively weighed. Respectively adding weighed water and an initiator into a three-neck flask with a stirrer, starting the stirrer to fully dissolve the initiator when the heating temperature of the three-neck flask rises to 70 ℃, adding weighed acrylic acid, and carrying out heat preservation reaction for 65 min. The modification can be carried out by introducing 1.6 percent of borax in the heat preservation reaction process.
Weighing polyacrylic acid of the component I with the weight of 3.0 percent of the scrubbing sand of the forest, and mixing the sand to prepare the core. Heating and hardening temperature is 220 ℃, time is 1.5min, and 8-shaped samples are prepared. The immediate tensile strength of the 8-shaped sample sand core is measured to be 0.54MPa, and the normal-temperature tensile strength is measured to be 1.53 MPa. The gas evolution is 5.3ml/g, and the high-temperature residual strength is 0 MPa.
Comparative example 11:
weighing DH-02 type polyacrylate resin binder accounting for 2.5 percent of the weight of the scrubbing sand of the big forest, weighing YZ type hardener accounting for 20 percent of the mass of the binder, and mixing the sand and making cores. Heating and hardening temperature is 120 ℃, time is 3min, and 8-shaped samples are prepared. The immediate tensile strength of the 8-shaped sample sand core is measured to be 0.1MPa, and the normal-temperature tensile strength is measured to be 1.1 MPa. The gas evolution is 8.3ml/g, and the high-temperature residual strength is 0.04 MPa.
Comparative example 12:
weighing hot core box resin (phenolic resin) accounting for 2.5% of the weight of the scrubbing sand of the forest, weighing curing agent (ammonium chloride: urea: water: 1:3:3) accounting for 20% of the mass of the binder (accounting for the mass of the resin), and mixing the sand and making the core. The heat hardening temperature was 210 ℃ and the time was 30 seconds, and a sample in the shape of "8" was prepared. The immediate tensile strength of the 8-shaped sample sand core is measured to be 0.5MPa, and the normal-temperature tensile strength is measured to be 1.9 MPa. The gas evolution is 18.5ml/g, and the high-temperature residual strength is 0.01 MPa.
Claims (6)
1. The application of the adhesive for casting is characterized in that: the application of the binder for casting to preparing the molding sand comprises weighing 2.0-3.0% of the components of the raw sand by weight
Polyacrylic acid, the components are weighed according to the mass percentage
Phosphate and Components
Silicon dioxide, then weighing the components
Phosphate and Components
Premixing silica and raw sand for 40-60 s, and then adding the weighed components
Polyacrylic acid, and sand mixing and core making; in the heating hardening core making process, the temperature of a core box is 100-250 ℃, and the heating time is 1-4 min;
the binder for casting comprises the components
Polyacrylic acid, component
Phosphate and Components
Silicon dioxide, as component
The mass of polyacrylic acid is taken as a reference, and the components
Phosphate is a component
The polyacrylic acid comprises the following components in percentage by mass: greater than 0 and less than or equal to 30 percent; components
Silicon dioxide as a constituent
The polyacrylic acid comprises the following components in percentage by mass: greater than 0 and less than or equal to 50 percent;
components
The polyacrylic acid is prepared by the following steps of weighing acrylic acid, water and an initiator according to the mass ratio, stirring and mixing the water and the initiator, fully dissolving the initiator when the heating temperature is raised to 70-95 ℃, adding the acrylic acid, carrying out heat preservation reaction for 5-70 min, introducing boric acid or borate in the heat preservation reaction process for modification, cooling and discharging for later use;
components
The polyacrylic acid is polymerized by water, acrylic acid and an initiator, and comprises the following raw materials in percentage by mass:
13% -26% of acrylic acid;
73.57% -86.63% of water;
0.37% -0.43% of an initiator.
2. Use of a foundry binder according to claim 1, characterized in that: the acrylic acid is colorless liquid, and the initiator is one or more of persulfate.
3. Use of a foundry binder according to claim 1, characterized in that: components
Phosphate refers to a phosphate solution produced by chemical synthesis of phosphoric acid and an alkaline oxide or hydroxide.
4. Use of a foundry binder according to claim 1, characterized in that: components
The phosphate is a phosphate single salt or a phosphate double salt solution.
5. Use of a foundry binder according to claim 1, characterized in that: components
The phosphate is modified into a modified phosphate by boric acid, citric acid or oxalic acid.
6. Use of a foundry binder according to claim 1, characterized in that: components
The silicon dioxide is crystalline silicon dioxide or amorphous silicon dioxide.
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| CN202010061967.6A CN111250647B (en) | 2020-01-20 | 2020-01-20 | Binder for casting and application thereof |
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| CN202010061967.6A CN111250647B (en) | 2020-01-20 | 2020-01-20 | Binder for casting and application thereof |
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| CN111250647B true CN111250647B (en) | 2021-07-16 |
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| CN85100367A (en) * | 1985-04-01 | 1985-11-10 | 湖南大学 | Acrylic acid series copolymer resin type sand adhesive |
| JPH081272A (en) * | 1994-06-20 | 1996-01-09 | Kao Corp | Molding sand adhesion preventive agent composition |
| JP2002266002A (en) * | 2001-03-12 | 2002-09-18 | Harima Chem Inc | Metallic fine particle-containing composition and producing method therefor |
| CN1805808A (en) * | 2003-06-13 | 2006-07-19 | Esk制陶两合公司 | Durable bn mould separating agents for the die casting of metals |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3778586A (en) * | 1970-04-02 | 1973-12-11 | Composite Sciences | Process for coating metals using resistance heating of preformed layer |
| GB0402516D0 (en) * | 2004-02-05 | 2004-03-10 | Univ Birmingham | Improved investment casting process |
| CN101941042B (en) * | 2010-09-03 | 2013-01-09 | 吴江市液铸液压件铸造有限公司 | Easily collapsed coated sand |
| EP2450389B1 (en) * | 2010-11-08 | 2015-03-18 | EMS-Patent AG | Adhesion promoter for textile reinforcing inserts and their use. |
| CN105855456B (en) * | 2016-04-13 | 2018-04-03 | 沈阳工业大学 | A kind of phosphate binders self-hardening sand curing agent and its preparation and application |
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2020
- 2020-01-20 CN CN202010061967.6A patent/CN111250647B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85100367A (en) * | 1985-04-01 | 1985-11-10 | 湖南大学 | Acrylic acid series copolymer resin type sand adhesive |
| JPH081272A (en) * | 1994-06-20 | 1996-01-09 | Kao Corp | Molding sand adhesion preventive agent composition |
| JP2002266002A (en) * | 2001-03-12 | 2002-09-18 | Harima Chem Inc | Metallic fine particle-containing composition and producing method therefor |
| CN1805808A (en) * | 2003-06-13 | 2006-07-19 | Esk制陶两合公司 | Durable bn mould separating agents for the die casting of metals |
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| CN111250647A (en) | 2020-06-09 |
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