CN113787166B - Alkaline phenolic resin sand-blown carbon dioxide cold core box composition and core making method - Google Patents
Alkaline phenolic resin sand-blown carbon dioxide cold core box composition and core making method Download PDFInfo
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- CN113787166B CN113787166B CN202110987877.4A CN202110987877A CN113787166B CN 113787166 B CN113787166 B CN 113787166B CN 202110987877 A CN202110987877 A CN 202110987877A CN 113787166 B CN113787166 B CN 113787166B
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- 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
- B22C1/22—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 of resins or rosins
- B22C1/2233—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 of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B22C1/2246—Condensation polymers of aldehydes and ketones
- B22C1/2253—Condensation polymers of aldehydes and ketones with phenols
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
- B22C9/123—Gas-hardening
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention belongs to the technical field of casting, and particularly relates to an alkaline phenolic resin sand carbon dioxide blowing cold core box composition and a core making method, wherein the composition comprises, by weight, 1.6-3.0% of carbon dioxide hardening alkaline phenolic resin, 0.2-0.6% of alkali liquor, 0.2-1.2% of amorphous silicon oxide and the balance of raw sand, according to the weight percentage, the raw sand is firstly mixed with the alkali liquor, then the amorphous silicon oxide is added and mixed uniformly, finally the carbon dioxide hardening alkaline phenolic resin is added and mixed uniformly, the mixture is added into a sand storage hopper, a core shooter is used for injecting CO into a die cavity, and finally the CO is injected into the die cavity 2 Blowing into the sand core cavity to harden the sand core, and stripping to obtain sand mold or sand core; wherein CO 2 The blowing pressure is 0.1-0.4MPa, and the blowing time is 10-60s. When the alkaline phenolic resin sand blows the carbon dioxide cold core box composition sand mixture, the raw sand is firstly mixed with alkali liquor, so that atoms on the surface of silica sand grains and Na in the alkali liquor + Ions or K + The ion contacts and collides to form a compound or complex, so that the activity of the sand surface is improved, and the purposes of reducing the resin addition and improving the strength of the sand core (type) are realized.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to an alkaline phenolic resin sand blowing carbon dioxide cold core box composition and a core making method.
Background
Current cold box core making techniques include: the method for producing the core by blowing triethylamine urethane resin cold box and the method for producing the core by blowing sulfur dioxide furan resin cold box and the method for producing the core by blowing methyl formate alkaline resin cold box have the advantages of no need of heating a cold box mould, core production at room temperature, energy conservation and high core production efficiency. The hard blowing gas in the cold box core making technology is triethylamine, sulfur dioxide and methyl formate, toxic and flavored gas is released in the core making process, the labor condition is poor, the physical health of field personnel is endangered, the environment is polluted, and the tail gas is required to be provided with a washing tower for harmless treatment.
Blowing carbon dioxide to harden the basic resin sand in 1967. Because the resin is high in addition amount and low in strength, the method is not widely popularized and used. In the eighties of the twentieth century, the company Foseco in England promoted Ecolotec2000 to blow carbon dioxide to harden alkaline phenolic resin, the resin addition amount was 2.5% -3.5%, and the tensile strength was 0.4-1.0 MPa. The carbon dioxide-blowing hardening alkaline phenolic resin cold core box is nontoxic and odorless, is popular with enterprises, and is popularized and applied. Many enterprises in China introduce and produce carbon dioxide hardening alkaline phenolic resin. The carbon dioxide blowing hardening alkaline phenolic resin sand can be used for core making of a core shooter, also can be used for manual core making, and the carbon dioxide blowing hardening of the cannula is flexible and convenient to apply. However, compared with other cold-box, the carbon dioxide hardening alkaline phenolic resin sand resin has high addition amount, low strength and larger strength loss in rainy seasons, and the carbon dioxide hardening alkaline phenolic resin can only be used for producing sand cores with simple shapes and thick sections by blowing, and the large cores and the complex sand cores are subjected to processes such as stripping, conveying, core setting and the like, and the sand cores are easy to deform or damage due to low strength, so that the application of the carbon dioxide hardening alkaline phenolic resin sand resin is limited. Improving the strength of the carbon dioxide blowing hardening alkaline phenolic resin sand, expanding the application range and being a research subject in the technical field of casting.
Disclosure of Invention
The invention aims to overcome the defects of the cold box technology and provide an alkaline phenolic resin sand blowing carbon dioxide cold box composition and a core making method.
In order to achieve the above purpose, the invention adopts the technical scheme that:
the carbon dioxide cold box composition is prepared with alkaline phenolic resin 1.6-3.0 wt%, alkali solution 0.2-0.6 wt%, non-crystalline silica 0.2-1.2 wt% and sand for the rest.
Preferably, the composition comprises, by weight, 1.8-2.5% of carbon dioxide hardened alkaline phenolic resin, 0.4-0.5% of alkali liquor, 0.3-0.8% of amorphous silicon oxide, and the balance of raw sand.
The alkali liquor is one or a mixture of two alkali liquor in NaOH aqueous solution or KOH aqueous solution, and the concentration of alkali liquor solute is 35% -45%. The aqueous alkali solution is a mixture of aqueous NaOH solution and aqueous KOH solution, wherein the aqueous NaOH solution accounts for 65-75% of the total amount of the solution, and the balance is the aqueous KOH solution.
The raw sand is standard sand, natural silica sand, artificial silica sand, zirconium sand, forsterite sand, precious sand or ceramic grain sand.
The natural silica sand is preferably large forest water-washed silica sand, scrubbing silica sand, enclosure water-washed silica sand, scrubbing silica sand and armed silica sand, the silica content of the silica sand should be more than 90%, and the silica sand is suitable for iron castings and nonferrous alloy castings; the silica sand content of the selected silica sand and the Fujian sea sand is more than 95 percent, and the method is suitable for steel castings.
The carbon dioxide hardening alkaline phenolic resin comprises: various carbon dioxide-curable alkaline phenolic resins for casting are commercially available;
the amorphous silicon oxide is silica white obtained by a precipitation method, silica fume and zirconium gas phase silicon oxide obtained by a pyrolysis method.
Preferably, the amorphous silica is silica fume, zirconia, or a mixture thereof. The technical indexes of the zirconium gas phase silicon oxide are as follows: siO (SiO) 2 The content is equal to or more than 85 percent, the specific surface area is equal to or more than 15m 2 /g。
The white carbon black is prepared by adding sulfuric acid into sodium silicate for neutralization, precipitating, washing and drying;
the fumed silica is prepared by pyrolyzing carbon tetrachloride in a high-temperature furnace;
silica fume is a byproduct produced during the production of silicon alloy, and is micropowder containing amorphous silicon oxide collected from a mining furnace flue;
when zirconium gas phase silicon oxide is produced by using an electric furnace, zirconium silicate is decomposed at high temperature, silicon dioxide is partially reduced to silicon monoxide, oxides of the silicon are discharged from a flue in a gaseous state, the silicon monoxide is oxidized to silicon dioxide immediately in the flue, and the silicon dioxide is collected to obtain the zirconium gas phase silicon oxide.
Silica fume and zircon vapor phase silica are industrial byproducts. The present application recommends comprehensive utilization of industrial byproducts.
A method for blowing carbon dioxide cold core box by using composite alkaline phenolic resin sand includes such steps as mixing raw sand with alkali solution, adding non-crystal silicon oxide, mixing, adding carbon dioxide to harden alkaline phenolic resin, mixing, loading it in sand storage hopper, injecting it in mould cavity, and CO 2 Blowing into the sand core cavity to harden the sand core, and stripping to obtain sand mold or sand core; wherein CO 2 The blowing pressure is 0.1-0.4MPa, and the blowing time is 10-60s.
The carbon dioxide is industrial CO 2 。
Further, a sand mixer is adopted for mixing, preferably a continuous sand mixer is adopted, the raw sand is firstly mixed with alkali liquor, then amorphous silicon oxide is added for mixing, and finally carbon dioxide hardening alkaline phenolic resin is added for mixing. Automatically controlling the feeding proportion by using a PLC, and uniformly mixing and feeding; adding the well mixed core-making sand composition into a sand storage hopper of a core shooter, injecting the core-making sand composition into a die cavity by the core shooter under the pressure of 0.4-0.7 MPa, and blowing carbon dioxide into the sand core cavity through a blowing plate under the pressure of 0.1-0.4MPa for 10-60 s; the 10-25 mm thin core is blown for 10-30 s, the blowing time is prolonged properly when the thickness of the core is larger than 25mm, the core is ejected out after being hardened, the core can be dried on the surface, and the core can be cast in a mold closing way in the same day, or can be stored for 3-5 days and then cast in a mold closing way.
In addition, the alkaline phenolic resin sand blowing carbon dioxide cold box composition manual core making method can be utilized, and comprises the following steps:
after the core making sand composition is mixed, the core box and the sand box are filled manually, and are compacted by a pneumatic tool or manually, and carbon dioxide is blown and hardened by a tube of a Shenyang Hui Asia water glass sand blowing hardening instrument. 1 to 5 pipes are inserted into the small core, 6 to 10 pipes are inserted into the large core, the blowing pressure is 0.1 to 0.4MPa, and the blowing time is 10 to 60 seconds. The blowing pressure and the blowing time are preset, and the blowing hardening instrument automatically controls the blowing program. After hardening, the box is turned over by manpower or a crane, and the mould is lifted.
Compared with the prior art, the invention has the beneficial effects that:
when the alkaline phenolic resin sand blows the carbon dioxide cold core box composition sand mixture, the raw sand is firstly mixed with alkali liquor, so that atoms on the surface of silica sand grains and Na in the alkali liquor + Ions or K + The ion contact and collision form a compound or complex, the activity of the sand surface is improved, a linking bridge between the sand surface and a resin film is increased, and the coating property of resin on the sand surface is increased, so that the mechanical property of carbon dioxide hardening alkaline phenolic resin sand is improved.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The core making process includes mixing raw sand with alkali solution, adding amorphous silica, mixing, adding carbon dioxide hardened alkaline phenolic resin, mixing with sand mixer to obtain core making sand mixture, injecting the core making sand mixture into mold, and blowing CO with blowing plate 2 Blowing gas into the die cavity for hardening, and CO 2 The blowing pressure is 0.1-0.4MPa, the blowing time is 10-60s, the lower limit of the small-sized and core blowing time is taken, the blowing time is properly prolonged for the large-sized and core, and the mold is pulled out after the blowing is finished.
The invention can also adopt a manual core making method, the core making sand composition is filled into a core box manually after being mixed, and is compacted by a pneumatic tool or an electric tool, and carbon dioxide is blown to harden by using a sodium silicate sand (purchased from Shenyang Huiya) HYT-2 blow hardening instrument cannula. 1 to 5 pipes are inserted into the small core, 6 to 10 pipes are inserted into the large core, the blowing pressure is 0.1 to 0.4MPa, and the blowing time is 10 to 60 seconds. The blowing pressure and the blowing time are preset, and the blowing hardening instrument is automatically controlled.
Example 1
CO 2 The hardened cold box core sand composition is:
2000g of Dalin water-washed sand, 10.0g of 40% NaOH aqueous solution and 10.0g of silica fume, 40g of carbon dioxide hardening alkaline phenolic resin (selected from JL-161 resin produced by Shenyang Huiya general) are taken, the Dalin water-washed sand is firstly mixed with the NaOH aqueous solution, the silica fume is added into the mixed solution, and finally, the carbon dioxide hardening alkaline phenolic resin is added into the mixed solution, and the components and the dosage are uniformly mixed through a vane type sand mixer in the sequence shown in Table 1.
The core making method comprises the following steps:
cores were fabricated using a Suzhou open technologies, inc. MLWA1 tester. Filling the 50% core-making sand composition into a sand shooting cylinder, injecting the core-making sand mixture into a standard 8-shaped tensile sample mold cavity by compressed air under the pressure of 0.4MPa, and pushing a blowing plate to the top of the mold by the core box mold along with the descending of a main cylinder, wherein the main cylinder is ascended to compress the blowing plate; starting the air blowing valve to drive CO under 0.2MPa 2 After the blowing is finished, the box is opened for coring, 5 boxes of 10 sand cores are manufactured, the tensile strength of the 8-shaped sample is detected by a hydraulic testing machine, and the instant strength is measured in 60 seconds: 0.48, 0.65, 0.56, 0.71, 0.62, (MPa), one maximum value and one minimum value are removed, and the average value of 3 samples in the middle is 0.61MPa; the final strength measured for 24 hours is as follows: 1.46, 1.74, 1.42, 1.68, 1.75, (MPa), one maximum value, one minimum value are removed, and the average value of the middle 3 samples is taken as: 1.62MPa. The average instant tensile strength, 24h average tensile strength is listed in table 2.
The rest 50% of core sand composition is used for manually forging standard phi 50mm multiplied by 50mm compression-resistant samples, a group of 10 samples are placed in an air blowing device, a sealing cover is closed, an air blowing valve is started, and CO is added under 0.2MPa 2 The gas is introduced into the blowing device, blowing is carried out for 25 seconds, after the blowing is finished, the cover is opened for coring, 10 sand cores are arranged in each box, the compressive strength of a sample is detected by a hydraulic testing machine, and the instant compressive strength measured in 60 seconds is as follows: 2.1, 2.9, 2.5, 3.1, 1.5,(MPa), taking an average value of 2.5MPa of 3 samples in the middle; the compression strength measured for 24 hours is as follows: 6.5, 7.8, 6.4, 7.5, 7.9, (MPa), the average value of the middle 3 samples was: 7.2MPa. The immediate average compressive strength, 24h average compressive strength is shown in Table 2.
Example 2
CO 2 The core sand composition of the hardening cold box is
2000g of enclosure water sand, 10.0g of 40% NaOH aqueous solution and 10.0g of silica fume, 40g of carbon dioxide hardening alkaline phenolic resin (selected from JL-161 resin produced by Shenyang Huiya general production), and mixing the enclosure water sand with the NaOH aqueous solution, adding the silica fume, mixing uniformly, and finally adding the carbon dioxide hardening alkaline phenolic resin, mixing uniformly by a blade type sand mixer, wherein the components and the dosage are shown in Table 1.
The core making method comprises the following steps:
cores were fabricated using a Suzhou open technologies, inc. MLWA1 tester. Filling the obtained composition into a sand shooting cylinder, injecting a core-making sand mixture into a standard 8-shaped tensile sample mold cavity by using compressed air under the pressure of 0.4MPa, and pushing a blowing plate to the top of the mold by the descending of a core box mold along with a main cylinder, and pressing the blowing plate by the ascending of the main cylinder; starting the air blowing valve to drive CO under 0.2MPa 2 After the blowing is finished, the box is opened for coring, 5 boxes of 10 sand cores are manufactured, the tensile strength of the 8-shaped sample is detected by a hydraulic testing machine, and the instant strength is measured in 60 seconds: 0.39, 0.59, 0.61, 0.69, 0.60 (MPa), one maximum value and one minimum value are removed, and the average value of the middle 3 samples is taken as follows: 0.60MPa; the final strength measured for 24 hours is as follows: 1.58, 1.60, 1.49, 1.45, 1.73 (MPa) with one maximum value and one minimum value removed, taking the average of the middle 3 samples as follows: 1.55MPa. The average instant tensile strength, 24h average tensile strength is shown in Table 2.
The rest 50% of core sand composition is used for manually forging standard phi 50mm multiplied by 50mm compression-resistant samples, a group of 10 samples are placed in an air blowing device, a sealing cover is closed, an air blowing valve is started, and CO is added under 0.2MPa 2 The air is introduced into the air blowing device and blown for 25 seconds, and after the air blowing is finishedAnd (3) uncovering and coring, wherein each box comprises 10 sand cores, the compressive strength of a sample is detected by a hydraulic testing machine, and the instant compressive strength measured in 60s is as follows: 1.7, 2.8, 2.7, 3.1, 2.7 (MPa), taking the average value of 3 samples in the middle to be 2.7MPa; the compression strength measured for 24 hours is as follows: 7.1, 7.2, 6.7, 6.5, 7.8 (MPa), the average value of the middle 3 samples was: 7.0MPa. The immediate average compressive strength, 24h average compressive strength is shown in Table 2.
Example 3
CO 2 The hardened cold box core sand composition is:
2000g of standard sand, 10.0g of 40% NaOH aqueous solution and 10.0g of zirconium gas phase silicon oxide are taken, 40g of carbon dioxide hardening alkaline phenolic resin (selected from JL-161 resin produced by Shenyang Huiya general) is taken, the standard sand is firstly mixed with the NaOH aqueous solution, then zirconium gas phase silicon oxide is added for uniform mixing, and finally the sequence of adding the carbon dioxide hardening alkaline phenolic resin is mixed uniformly by a blade type sand mixer, wherein the components and the dosage are shown in table 1.
The core making method comprises the following steps:
the core is manufactured by adopting a MLWA1 sample machine of Suzhou open technology, the obtained sand is mixed, the core-manufacturing (molding) sand composition is filled into a sand injection cylinder, the core-manufacturing (molding) sand composition is injected into a standard 8-shaped tensile sample experimental mold by compressed air under 0.6MPa, and CO is injected into the mold under 0.2MPa 2 The gas is blown into a standard 8-shaped sample experiment mould through a blowing plate, the blowing time is 30s, two sand cores are opened and cored, 5 boxes of 10 sand cores are manufactured, the tensile strength of the 8-shaped sample is detected by a hydraulic testing machine, the instant strength is measured in 60s, namely 0.69, 0.81, 0.79, 0.82 and 0.79 (MPa), one maximum value and one minimum value are removed, and the average value of 3 samples in the middle is 0.79; the final strength measured for 24 hours is as follows: 1.59, 1.73, 1.62, 1.29, 1.67, (MPa), one maximum value and one minimum value are removed, and the average value of the middle 3 samples is taken as follows: 1.63MPa. I.e. the tensile strength at average and the tensile strength at average over 24 hours are shown in Table 2.
The rest 50% of core sand composition is used for manually forging standard phi 50mm multiplied by 50mm compression-resistant samples, a group of 10 samples are placed in an air blowing device, a sealing cover is closed, an air blowing valve is started, and CO is added under 0.2MPa 2 The gas is introduced into the blowing device, blowing is carried out for 25 seconds, after the blowing is finished, the cover is opened for coring, 10 sand cores are arranged in each box, the compressive strength of a sample is detected by a hydraulic testing machine, and the instant compressive strength measured in 60 seconds is as follows: 3.1, 3.6, 3.5, 3.7, 3.5 (MPa), taking the average value of 3 samples in the middle to be 3.5MPa; the compression strength measured for 24 hours is as follows: 7.1, 7.8, 7.3, 5.8, 7.5, taking the average of the middle 3 samples as: 7.3MPa. The immediate average compressive strength, 24h average compressive strength is shown in Table 2.
Example 4
CO 2 The core sand composition of the hardening cold box is
2000g of standard sand, 7g of 40% NaOH aqueous solution, 3g of 40% KOH aqueous solution and 10.0g of zirconium gas phase silicon oxide, 40g of carbon dioxide hardening alkaline phenolic resin (selected from the Style SQJ610 resin), and mixing the standard sand with alkali liquor, then adding the zirconium gas phase silicon oxide, mixing uniformly, and finally adding the carbon dioxide hardening alkaline phenolic resin, mixing uniformly by a blade type sand mixer, wherein the components and the dosage are shown in Table 1.
The core making method comprises the following steps:
cores were fabricated using a Suzhou open technologies, inc. MLWA1 tester. Filling the obtained composition into a sand shooting cylinder, injecting a core-making sand mixture into a standard 8-shaped tensile sample mold cavity by using compressed air under the pressure of 0.4MPa, and pushing a blowing plate to the top of the mold by the descending of a core box mold along with a main cylinder, and pressing the blowing plate by the ascending of the main cylinder; starting the air blowing valve to drive CO under 0.2MPa 2 After the blowing is finished, the box is opened for coring, 5 boxes of 10 sand cores are manufactured, the tensile strength of the 8-shaped sample is detected by a hydraulic testing machine, and the instant strength is measured in 60 seconds: 0.69, 0.83, 0.85, 0.90 and 0.86 (MPa), one maximum value and one minimum value are removed, and the average value of 3 samples in the middle is 0.86MPa; the final strength measured for 24 hours is as follows: 1.62, 1.49, 1.41, 1.23, 1.42 (MPa), one maximum value and one minimum value are removed, and the average value of the middle 3 samples is taken as follows: 1.44MPa. The average instant tensile strength, and the tensile strength after averaging 24 hours are shown in Table 2.
Making cores with the remaining 50%Sand composition, a group of 10 samples were placed in a blowing apparatus, the sealing cap was closed, the blowing valve was actuated, and CO was injected under 0.2MPa 2 The gas is introduced into the blowing device, blowing is carried out for 25 seconds, after the blowing is finished, the cover is opened for coring, 10 sand cores are arranged in each box, the compressive strength of a sample is detected by a hydraulic testing machine, and the instant compressive strength measured in 60 seconds is as follows: 3.1, 3.7, 3.8, 4.0, 3.9 (MPa), taking the average value of 3 samples in the middle to be 3.8MPa; the compression strength measured for 24 hours is as follows: 7.3, 6.7, 6.3, 5.5, 6.4 (MPa), the average value of the middle 3 samples is: 6.5MPa. The immediate average compressive strength, 24h average compressive strength is shown in Table 2.
Example 5
CO 2 The core sand composition of the hardening cold box is
2000g of standard sand, 10.0g of 40% NaOH aqueous solution and 10.0g of zirconium gas phase silicon oxide are taken, the model number is JL-161 carbon dioxide hardened alkaline phenolic resin, and the standard sand is firstly mixed with the NaOH aqueous solution, then zirconium gas phase silicon oxide is added for uniform mixing, and finally the carbon dioxide hardened alkaline phenolic resin is added for uniform mixing through a blade type sand mixer in sequence, wherein the components and the dosage are shown in the table 1.
The core making method comprises the following steps:
cores were fabricated using a Suzhou open technologies, inc. MLWA1 tester. Filling the obtained composition into a sand shooting cylinder, injecting a core-making sand mixture into a standard 8-shaped tensile sample mold cavity by using compressed air under the pressure of 0.4MPa, and pushing a blowing plate to the top of the mold by the descending of a core box mold along with a main cylinder, and pressing the blowing plate by the ascending of the main cylinder; starting the air blowing valve to drive CO under 0.2MPa 2 After the blowing is finished, the box is opened for coring, 5 boxes of 10 sand cores are manufactured, the tensile strength of the 8-shaped sample is detected by a hydraulic testing machine, and the instant strength is measured in 60 seconds: 0.57, 0.73, 0.68, 0.85, 0.71 (MPa), one maximum value and one minimum value are removed, and the average value of the middle 3 samples is taken as follows: 0.71MPa; the final strength measured for 24 hours is as follows: 1.64, 1.76, 1.67, 1.31, 1.46MPa, one maximum value and one minimum value are removed, and the average value of the middle 3 samples is:1.59MPa. The average instant tensile strength and the tensile strength after 24 hours are shown in Table 2.
The rest 50% of core sand composition is used for manually forging standard phi 50mm multiplied by 50mm compression-resistant samples, a group of 10 samples are placed in an air blowing device, a sealing cover is closed, an air blowing valve is started, and CO is added under 0.2MPa 2 The gas is introduced into the blowing device, blowing is carried out for 25 seconds, after the blowing is finished, the cover is opened for coring, 10 sand cores are arranged in each box, the compressive strength of a sample is detected by a hydraulic testing machine, and the instant compressive strength measured in 60 seconds is as follows: 2.6, 3.3, 3.0, 3.8, 3.2 (MPa), taking the average value of 3 samples in the middle to be 3.2MPa; the compression strength measured for 24 hours is as follows: 7.4, 7.9, 7.5, 5.9, 6.6 (MPa), the average value of the middle 3 samples was: 7.1MPa. The immediate average compressive strength, 24h average compressive strength is shown in Table 2.
Example 6
CO 2 The core sand composition of the hardening cold box is
2000g of standard sand, 7.7g of 40% NaOH aqueous solution, 3.3g of 40% KOH aqueous solution, 11g of zirconium gas phase silicon oxide and 44g of model JL-161 carbon dioxide hardening alkaline phenolic resin are taken, the standard sand is firstly mixed with alkali liquor, then zirconium gas phase silicon oxide is added for uniform mixing, and finally the sequence of adding the carbon dioxide hardening alkaline phenolic resin is mixed uniformly by a blade type sand mixer, wherein the components and the dosage are shown in table 1.
The core making method comprises the following steps:
cores were fabricated using a Suzhou open technologies, inc. MLWA1 tester. Filling the obtained composition into a sand shooting cylinder, injecting a core-making sand mixture into a standard 8-shaped tensile sample mold cavity by using compressed air under the pressure of 0.4MPa, and pushing a blowing plate to the top of the mold by the descending of a core box mold along with a main cylinder, and pressing the blowing plate by the ascending of the main cylinder; starting the air blowing valve to drive CO under 0.2MPa 2 After the blowing is finished, the box is opened for coring, 5 boxes of 10 sand cores are manufactured, the tensile strength of the 8-shaped sample is detected by a hydraulic testing machine, and the instant strength is measured in 60 seconds: 0.79, 0.92, 0.85, 0.90, 0.91 (MPa), one maximum value and one minimum value are removed, and the average of the middle 3 samples is takenThe values are: 0.89MPa; the final strength measured for 24 hours is as follows: 1.87, 1.85, 1.80, 1.77, 1.80 (MPa), one maximum value and one minimum value are removed, and the average value of the middle 3 samples is taken as follows: 1.81MPa. The average instant tensile strength, and the tensile strength after averaging 24 hours are shown in Table 2.
The rest 50% of core sand composition is used for manually forging standard phi 50mm multiplied by 50mm compression-resistant samples, a group of 10 samples are placed in an air blowing device, a sealing cover is closed, an air blowing valve is started, and CO is added under 0.2MPa 2 The gas is introduced into the blowing device, blowing is carried out for 25 seconds, after the blowing is finished, the cover is opened for coring, 10 sand cores are arranged in each box, the compressive strength of a sample is detected by a hydraulic testing machine, and the instant compressive strength measured in 60 seconds is as follows: 3.5, 4.1, 3.8, 4.0, 4.1 (MPa), taking the average value of 3 samples in the middle to be 3.9MPa; the compression strength measured for 24 hours is as follows: 8.4, 8.3, 8.1, 8.0, 8.1 (MPa), the average value of the middle 3 samples was: 8.1MPa. The immediate average compressive strength, 24h average compressive strength is shown in Table 2.
Example 7
CO 2 The core sand composition of the hardening cold box is
2000g of standard sand, 4.5g of 40% NaOH aqueous solution, 1.5g of 40% KOH aqueous solution, 11g of zirconium gas phase silica, 44g of JL-161 carbon dioxide hardening alkaline phenolic resin, and mixing the standard sand with alkali liquor, then adding zirconium gas phase silica, mixing uniformly, and finally adding the carbon dioxide hardening alkaline phenolic resin, mixing uniformly by a blade type sand mixer, wherein the components and the dosage are shown in Table 1.
The core making method comprises the following steps:
cores were fabricated using a Suzhou open technologies, inc. MLWA1 tester. Filling the obtained composition into a sand shooting cylinder, injecting a core-making sand mixture into a standard 8-shaped tensile sample mold cavity by using compressed air under the pressure of 0.4MPa, and pushing a blowing plate to the top of the mold by the descending of a core box mold along with a main cylinder, and pressing the blowing plate by the ascending of the main cylinder; starting the air blowing valve to drive CO under 0.2MPa 2 Air is blown into the sand core cavity through the blowing plate, the air is blown for 25 seconds, after the air blowing is finished, the box is opened for coring, two sand cores are arranged in each box, 5 boxes of 10 sand cores are manufactured, and an 8-shaped test machine is used for detectingThe sample tensile strength and the real-time strength measured in 60 seconds are as follows: 0.74, 0.82, 0.79, 0.85, 0.99, (MPa), one maximum value and one minimum value are removed, and the average value of the middle 3 samples is taken as follows: 0.82MPa; the final strength of the test is 1.87, 1.71, 1.50, 1.62 and 1.80, (MPa), one maximum value and one minimum value are removed, and the average value of 3 samples in the middle is: 1.71MPa. The average instant tensile strength, and the tensile strength after averaging 24 hours are shown in Table 2.
The rest 50% of core sand composition is used for manually forging standard phi 50mm multiplied by 50mm compression-resistant samples, a group of 10 samples are placed in an air blowing device, a sealing cover is closed, an air blowing valve is started, and CO is added under 0.2MPa 2 The gas is introduced into the blowing device, blowing is carried out for 25 seconds, after the blowing is finished, the cover is opened for coring, 10 sand cores are arranged in each box, the compressive strength of a sample is detected by a hydraulic testing machine, and the instant compressive strength measured in 60 seconds is as follows: 3.3, 3.7, 3.5, 3.8, 4.4, (MPa), taking the average value of 3 samples in the middle to be 3.6MPa; the compression strength measured for 24 hours is as follows: 8.4, 7.7, 6.8, 7.3, 8.1 (MPa), the average value of the middle 3 samples was: 7.7MPa. The immediate average compressive strength, 24h average compressive strength is shown in Table 2.
Comparative example 1
CO 2 The core sand composition of the hardening cold box is
The standard sand 2000g, JL-161 carbon dioxide hardened alkaline phenolic resin 40g and zirconium gas phase silicon oxide 10g are taken and mixed evenly by a vane type sand mixer, and the components and the dosage are shown in the table 1.
The core making method comprises the following steps:
cores were fabricated using a Suzhou open technologies, inc. MLWA1 tester. Filling the obtained composition into a sand shooting cylinder, injecting a core-making sand mixture into a standard 8-shaped tensile sample mold cavity by using compressed air under the pressure of 0.4MPa, and pushing a blowing plate to the top of the mold by the descending of a core box mold along with a main cylinder, and pressing the blowing plate by the ascending of the main cylinder; starting the air blowing valve to drive CO under 0.2MPa 2 After the blowing is finished, the box is opened for coring, 5 boxes of 10 sand cores are manufactured, the tensile strength of the 8-shaped sample is detected by a hydraulic testing machine, and the instant strength is measured in 60 seconds:0.60, 0.69, 0.62, 0.65, 0.75, (MPa), one maximum value and one minimum value are removed, and the average value of the middle 3 samples is taken as follows: 0.65MPa; the final strength of the test is 0.90, 0.99, 0.85, 0.72 and 1.12 (MPa), one maximum value and one minimum value are removed, and the average value of 3 samples in the middle is: 0.91MPa. The average instant tensile strength, and the tensile strength after averaging 24 hours are shown in Table 2.
The rest 50% of core sand composition is used for manually forging standard phi 50mm multiplied by 50mm compression-resistant samples, a group of 10 samples are placed in an air blowing device, a sealing cover is closed, an air blowing valve is started, and CO is added under 0.2MPa 2 The gas is introduced into the blowing device, blowing is carried out for 25 seconds, after the blowing is finished, the cover is opened for coring, 10 sand cores are arranged in each box, the compressive strength of a sample is detected by a hydraulic testing machine, and the instant compressive strength measured in 60 seconds is as follows: 2.9, 3.1, 2.8, 2.9, 3.4, (MPa), taking the average value of 3 samples in the middle to be 3.0MPa; the compression strength measured for 24 hours is as follows: 4.1, 4.4, 3.8, 3.2, 5.0 (MPa), the average value of the middle 3 samples is: 4.1MPa. The immediate average compressive strength, 24h average compressive strength is shown in Table 2.
Comparative example 2
CO 2 The core sand composition of the hardening cold box is
The standard sand 2000g, JL-161 carbon dioxide hardened alkaline phenolic resin 48g and zirconium gas phase silicon oxide 10g are taken and mixed evenly by a vane type sand mixer, and the components and the dosage are shown in the table 1.
The core making method comprises the following steps:
cores were fabricated using a Suzhou open technologies, inc. MLWA1 tester. Filling the obtained composition into a sand shooting cylinder, injecting a core-making sand mixture into a standard 8-shaped tensile sample mold cavity by using compressed air under the pressure of 0.4MPa, and pushing a blowing plate to the top of the mold by the descending of a core box mold along with a main cylinder, and pressing the blowing plate by the ascending of the main cylinder; starting the air blowing valve to drive CO under 0.2MPa 2 After the blowing is finished, the box is opened for coring, 5 boxes of 10 sand cores are manufactured, the tensile strength of the 8-shaped sample is detected by a hydraulic testing machine, and the instant strength is measured in 60 seconds: 0.77, 0.81, 0.80, 0.85, 0.78, (MPa), and removingOne maximum value and one minimum value are removed, and the average value of the middle 3 samples is taken as follows: 0.79MPa; the final strength of the test is 1.19, 1.20, 1.22, 1.21 and 1.28, (MPa), one maximum value and one minimum value are removed, and the average value of 3 samples in the middle is taken as follows: 1.21MPa. The average instant tensile strength, and the tensile strength after averaging 24 hours are shown in Table 2.
The rest 50% of core sand composition is used for manually forging standard phi 50mm multiplied by 50mm compression-resistant samples, a group of 10 samples are placed in an air blowing device, a sealing cover is closed, an air blowing valve is started, and CO is added under 0.2MPa 2 The gas is introduced into the blowing device, blowing is carried out for 25 seconds, after the blowing is finished, the cover is opened for coring, 10 sand cores are arranged in each box, the compressive strength of a sample is detected by a hydraulic testing machine, and the instant compressive strength measured in 60 seconds is as follows: 3.1, 3.3, 3.5, 3.6, 3.0, (MPa), taking the average value of 3 samples in the middle to be 3.3MPa; the compression strength measured for 24 hours is as follows: 5.1, 5.3, 5.2, 5.6, (MPa) taking the average of the middle 3 samples as: 5.2MPa. The immediate average compressive strength, 24h average compressive strength is shown in Table 2.
Comparative example 3
CO 2 The hardened cold box core sand composition is:
mixing 40% NaOH aqueous solution 10g with carbon dioxide hardening alkaline phenolic resin (selected from JL-161 resin produced by Shenyang Huiya general purpose) 48g, adding standard sand 2000g into a vane type sand mixer, adding zirconium gas phase silicon oxide 10.0g, mixing, and mixing the resin with alkali water mixture, wherein the components and the dosage are shown in table 1.
The core making method comprises the following steps:
cores were fabricated using a Suzhou open technologies, inc. MLWA1 tester. Filling the 50% core-making sand composition into a sand shooting cylinder, injecting the core-making sand mixture into a standard 8-shaped tensile sample mold cavity by compressed air under the pressure of 0.4MPa, and pushing a blowing plate to the top of the mold by the core box mold along with the descending of a main cylinder, wherein the main cylinder is ascended to compress the blowing plate; starting the air blowing valve to drive CO under 0.2MPa 2 Air is blown into the sand core cavity through the blowing plate, the air is blown for 25 seconds, after the air blowing is finished, the box is opened for coring, two sand cores are arranged in each box, 5 boxes of 10 sand cores are manufactured, and a hydraulic testing machine is used for detecting "The tensile strength of the 8-shaped sample is as follows when the instant strength is measured in 60 seconds: 0.67, 0.69, 0.65, 0.70, 0.68, (MPa), one maximum value and one minimum value are removed, and the average value of 3 samples in the middle is 0.68MPa; the final strength measured for 24 hours is as follows: 1.32, 1.30, 1.33, 1.31, 1.33, (MPa), one maximum value and one minimum value are removed, and the average value of the middle 3 samples is taken as: 1.32MPa. The average instant tensile strength, 24h average tensile strength is listed in table 2.
The rest 50% of core sand composition is used for manually forging standard phi 50mm multiplied by 50mm compression-resistant samples, a group of 10 samples are placed in an air blowing device, a sealing cover is closed, an air blowing valve is started, and CO is added under 0.2MPa 2 The gas is introduced into the blowing device, blowing is carried out for 25 seconds, after the blowing is finished, the cover is opened for coring, 10 sand cores are arranged in each box, the compressive strength of a sample is detected by a hydraulic testing machine, and the instant compressive strength measured in 60 seconds is as follows: 3.41, 3.49, 3.30, 3.22 and 3.58 (MPa), one maximum value and one minimum value are removed, and the average value of 3 samples in the middle is 3.40MPa; the compression strength measured for 24 hours is as follows: 6.86, 6.33, 6.35, 6.42, 6.43 (MPa), one maximum value and one minimum value are removed, and the average value of the middle 3 samples is: 6.4MPa. The immediate average compressive strength, 24h average compressive strength is shown in Table 2.
TABLE 1
TABLE 2
As can be seen from table 2, example 3 compares with comparative example 1 data:
immediate tensile strength: (0.79-0.45)/0.45×100% = 75%
Intensity for 24h (1.63-0.91)/0.91×100% =79%
Example 3 is compared with comparative example 1: the resin addition amount is the same, the instant strength is improved by 75%, and the tensile strength for 24 hours is improved by 79%, so that the addition of the alkali improves the mechanical properties of the carbon dioxide hardening alkaline phenolic resin sand.
Meanwhile, as can be seen from Table 2, the resin addition amount of example 3 was 2%, the resin addition amount of comparative example 3 was 2.4%, and the mechanical properties were compared as follows:
immediate tensile strength: (0.79-0.68)/0.68×100+=16%
Tensile strength for 24h (1.60-1.32)/1.32X100% = 21.2%
Comparative example 3 the modification effect is remarkably reduced due to the mixing of the resin with alkali water before sand mixing, which interferes with the reaction of the surface atoms of the sand example with alkali ions, and comparative example 3 is compared with example 3: the instant tensile strength is reduced by 16 percent, and the 24-hour tensile strength is reduced by 21.2 percent.
After the resin alkali-water mixture of comparative example 3 was left in the room for 24 hours, the mixture became cloudy, the upper and lower colors of the liquid became unbalanced, and the alkali water deteriorated the stability of the resin liquid, so that the alkali water was added to the resin before the sand mixing, resulting in deterioration of the resin.
Therefore, the composition has low resin addition amount and high mechanical property, is favorable for popularization and application, blows hard gas without toxicity and smell, improves the labor condition of workers, and is favorable for environmental protection.
In the foregoing, the protection scope of the present invention is not limited to the preferred embodiments of the present invention, and any simple changes or equivalent substitutions of the technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present invention disclosed in the present invention fall within the protection scope of the present invention.
Claims (7)
1. A method for producing a carbon dioxide cold box composition by using alkaline phenolic resin sand, which is characterized in that: the alkaline phenolic resin sand blowing carbon dioxide cold box composition comprises the following components in percentage by weight: 1.6 to 3.0 percent of carbon dioxide hardening alkaline phenolic resin, 0.2 to 0.6 percent of alkali liquor, 0.2 to 1.2 percent of amorphous silicon oxide and the balance of raw sand;
according to the weight percentage, the raw materials areMixing sand with alkali liquor, adding amorphous silicon oxide, mixing, adding carbon dioxide to harden alkaline phenolic resin, mixing, adding the mixture into sand storage hopper, injecting into mould cavity with core shooter, and adding CO 2 Blowing into the sand core cavity to harden the sand core, and stripping to obtain sand mold or sand core; wherein CO 2 The blowing pressure is 0.1-0.4MPa, and the blowing time is 10-60s.
2. The method of making a carbon dioxide cold box composition using alkaline phenolic resin sand as claimed in claim 1, wherein: the carbon dioxide cold box composition is prepared from (by weight) alkaline phenolic resin 1.8-2.5%, alkaline solution 0.4-0.5%, amorphous silica 0.3-0.8%, and raw sand for the rest.
3. A method of making a carbon dioxide cold box composition using alkaline phenolic resin sand as claimed in claim 1 or claim 2, wherein: the alkali liquor is one or two of NaOH aqueous solution and KOH aqueous solution, and the mass concentration of the alkali liquor is 35% -45%.
4. A method of making a carbon dioxide cold box composition using alkaline phenolic resin sand as claimed in claim 3, wherein: the alkali liquor is a mixture of NaOH aqueous solution and KOH aqueous solution, wherein the NaOH aqueous solution accounts for 65-75% of the total solution, and the rest is KOH aqueous solution.
5. The method of making a carbon dioxide cold box composition using alkaline phenolic resin sand as claimed in claim 1, wherein: the amorphous silicon oxide is silica fume or zirconium gas phase silicon oxide.
6. The method of making a carbon dioxide cold box composition using alkaline phenolic resin sand as claimed in claim 1, wherein: the raw sand is standard sand, natural silica sand, artificial silica sand, zirconium sand, forsterite sand, precious sand or ceramic grain sand.
7. The method of making a carbon dioxide cold box composition using alkaline phenolic resin sand as claimed in claim 1, wherein: the CO 2 Is industrial CO 2 。
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