CN111391190A - Composite resin casting mold and manufacturing method thereof - Google Patents
Composite resin casting mold and manufacturing method thereof Download PDFInfo
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- CN111391190A CN111391190A CN202010233798.XA CN202010233798A CN111391190A CN 111391190 A CN111391190 A CN 111391190A CN 202010233798 A CN202010233798 A CN 202010233798A CN 111391190 A CN111391190 A CN 111391190A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/26—Moulds or cores
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/002—Priming paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a composite resin casting mould and a manufacturing method thereof, which are characterized in that: the coating comprises a base mold, a bottom coating and a wear-resistant layer, wherein the bottom coating is made of epoxy resin; the wear-resistant layer is made of modified polyurethane. Compared with the prior art, the invention has the beneficial effects that: the process of a female die consisting of a female die and/or a male die is omitted, a base die (namely a casting sand mould) of a casting wood die or other non-metal dies can be directly processed and cast by a numerical control machine tool, and a diluent, a hardening agent and nano aluminum oxide are added into polyurethane, so that the polyurethane viscosity can be reduced while the wear resistance and hardness of the polyurethane are improved, the gel time is prolonged, the Shore hardness can still be kept as high as 65-70D, and the superior performance enables all gas and airless spraying equipment and even a common spray can to smoothly carry out spraying. In the process of carrying out secondary numerical control finish machining on the wear-resistant layer, the polyurethane material generates cutting and shredding, and is free of dust, environment-friendly and pollution-free.
Description
Technical Field
The invention belongs to the technical field of mold processing, and particularly relates to a composite resin casting mold.
Background
At present, most of moulds used in the domestic and foreign casting industry are metal moulds, resin moulds, wood moulds and foam moulds, although the wood moulds have short manufacturing period and low production cost, the service life of the wood mould casting is short, the sand casting molding frequency is only about 200 times, and especially most of the surface layer of the wood moulds are painted or brushed with nitro-acid, alkyd and other paints and have no wear resistance; although the metal mould is wear-resistant, the metal mould is not corrosion-resistant and moisture-proof, and particularly has the defects of easiness in sand sticking when being cooled in winter, long manufacturing period, high manufacturing cost and the like; although the polyurethane mold (resin mold) has the advantages of wear resistance, corrosion resistance, moisture resistance, sand adhesion prevention in winter and the like, the polyurethane mold (resin mold) also has the disadvantages of complicated manufacturing process flow, great environmental pollution, long period, high manufacturing cost and the like, and the defects of long manufacturing time, material and delivery period and the like of a female mold consisting of a female mold and/or a male mold which is complicated; the whole process of processing and manufacturing the density board generates dust, and the environment is polluted.
For example, the defects of various conventional moulds can be effectively overcome by coating polyurethane on the surface of the original nonmetal casting mould, but the viscosity of the polyurethane material adopted in the prior art and the A, B material after mixing is about 5000-5500mPa s, the viscosity is very high, and the gel time is only 15-20 minutes, so that the polyurethane can be directly coated on the surface of the nonmetal casting mould only by manual coating, and the labor and the time are wasted. At present, both air spraying equipment and airless spraying equipment cannot be used for completing spraying. If a diluent is added into polyurethane, spraying can be carried out, but the hardness and the wear resistance are not enough. Currently, although there are many kinds of polyurethane or polyurea, no polyurethane suitable for spraying casting molds and maintaining performance is found.
Disclosure of Invention
In order to solve the technical problems in the prior art, the technical scheme adopted by the invention for achieving the purpose is as follows:
a composite resin casting mould comprises a base mould, a bottom coating and a wear-resistant layer, wherein the bottom coating is made of epoxy resin; the wear-resistant layer is made of modified polyurethane, the modified polyurethane comprises A, B components, and the component A is isocyanate; the component B is polyhydric alcohol, the component A and the component B are mixed according to the weight ratio of 100: 5-100: 40 for use, and the component A further comprises a diluent, a hardening agent and nano-alumina.
Further, the base mold is made of non-metal materials, specifically wood, plastics, resin foaming materials or recyclable paper boards.
Further, the mass ratio of the diluent, the hardening agent, the nano alumina and the A, B component after mixing is 20-25%, 0.8-1% and 2-3% respectively.
Further, the diluent is a product sold in the chemical industry of Zhang hong Kong Yuanbang, and the model is a new generation of PU-10 environment-friendly diluent modifier; the hardening agent is a product sold in Hongyui chemical industry of Dongguan, and the model is a hardening wear-resistant anti-scraping agent HR-8501; the nano alumina is 50 nano alumina subjected to surface grafting modification treatment by adopting a silane coupling agent KH-550, and the production manufacturer is Nanjing Eprina nano material.
Further, the epoxy resin is E-44/6101 epoxy resin with Shore hardness of 90-95D. Because the base material of the non-metal molds such as the cast wood mold is soft, in order to enhance the hardness of the non-metal molds, high-hardness E-44/6101 epoxy resin (with Shore hardness of 90-95D) is sprayed or brushed, and the epoxy resin can be used as the surface of the non-metal molds such as the wood mold and the like and the ground coating of the modified polyurethane, so that the problem of poor adhesion of the polyurethane is solved.
The method for further manufacturing the composite resin casting mould comprises the following steps: (1) processing a base die: adopting three-dimensional design, carrying out numerical control processing on wood, plastics and resin foaming materials or recyclable paperboard materials, reducing the size by 0.2-5mm, modifying a base die, and sealing holes and smearing greasiness;
(2) spraying and brushing a bottom coating: spraying epoxy resin on the surface of the base mold, wherein the thickness is 0.1-2 mm;
(3) spraying and brushing a wear-resistant layer: preparing modified polyurethane, namely, after keeping the temperature of the component A at 40 ℃ for 1 hour, adding a diluent, a hardening agent and nano alumina into the component A according to the weight ratios of 20-25%, 0.8-1% and 2-3% after mixing with the component A, B, uniformly mixing and stirring the component A and the component A by adopting a stirrer of 60-1500 r/min, using the component B at the normal temperature (18-35 ℃), and uniformly mixing and stirring the component A, B according to the weight ratio of 100: 5-100: 40; spraying modified polyurethane on the bottom coating, wherein the thickness is 0.1-6mm, and preparing a composite resin casting mold;
(4) polishing: and (4) carrying out wax wiping and accurate polishing treatment on the manufactured composite resin casting mould to achieve the smoothness as a mirror.
The method for further manufacturing the composite resin casting mould with the wear-resistant and corrosion-resistant coating of 0.2-0.5mm comprises the following steps:
(1) processing a base die: adopting three-dimensional design, carrying out numerical control processing on wood, plastics and resin foaming materials or recyclable paperboard materials, reducing the size by 0.2-0.5mm, modifying a base die, sealing holes, smearing grease, grinding and polishing;
(2) spraying and brushing a bottom coating: spraying epoxy resin on the surface of the base mold, wherein the thickness is 0.1-0.2 mm;
(3) spraying and brushing a wear-resistant layer: preparing modified polyurethane, namely after keeping the temperature of the component A at 40 ℃ for 1 hour, adding a diluent, a hardening agent and nano alumina into the component A according to the weight ratio of 20-25%, 0.8-1% and 2-3% after mixing with the component A, B, uniformly mixing and stirring the component A and the component A by adopting a stirrer of 60-1500 r/min, using the component B at the normal temperature (18-35 ℃), and uniformly mixing and stirring the component B according to the weight ratio of A, B to 100: 10; spraying modified polyurethane on the bottom coating, wherein the thickness is 0.1-0.4mm, and preparing a composite resin casting mold; the thickness of the size is reduced by 0.2-0.5mm to obtain a compensation;
(4) polishing: and (4) carrying out wax wiping and accurate polishing treatment on the manufactured composite resin casting mould to achieve the smoothness as a mirror.
The method for further manufacturing the composite resin casting mould with the corrosion resistance and the wear resistance exceeding the 3-5mm coating of alloy steel and high-carbon steel comprises the following steps:
(1) processing a base die: the method is characterized in that a three-dimensional design is adopted, numerical control processing is carried out on wood, plastic and resin foaming materials or recyclable paperboard materials, the size is reduced by 3-5mm, a base die is modified, sealing holes are smeared, the base die is roughly processed, the surface is provided with a rough surface, and the adhesive force of the base die to epoxy resin can be enhanced;
(2) spraying and brushing a bottom coating: spraying epoxy resin on the surface of the base mold, wherein the thickness is 0.5-2 mm;
(3) spraying and brushing a wear-resistant layer: preparing modified polyurethane, namely after keeping the temperature of the component A at 40 ℃ for 1 hour, adding a diluent, a hardening agent and nano alumina into the component A according to the weight ratios of 20-25%, 0.8-1% and 2-3% after mixing with the component A, B, uniformly mixing and stirring the component A and the component A by adopting a stirrer of 60-1500 r/min, using the component B at the normal temperature (18-35 ℃), and uniformly mixing and stirring the component A, B according to the weight ratio of 100: 12;
spraying modified polyurethane on the bottom coating, wherein the thickness of the modified polyurethane is 2.5-6mm, a composite resin casting mold is manufactured, and the surplus 0.5-1 mm of the super-thick coating is the finishing allowance;
(4) finish machining: carrying out secondary numerical control fine machining on the preliminarily manufactured composite resin casting mould by adopting a PCD highlight milling cutter; because polyurethane belongs to elastomer high polymer materials, the rotational speed of 12000-24000 is generated during high-speed processing of the die, the phenomena of knife sticking and knife jumping can be generated by adopting metal processing cutters such as alloy cutters, high-speed steel milling cutters and the like, the phenomena of knife sticking and knife jumping during processing of the polyurethane can be solved by selecting PCD highlight milling cutters provided by Funanke superhard materials GmbH, and the apparent gloss of the polyurethane die is extremely high;
(5) polishing: and (4) carrying out wax wiping and accurate polishing treatment on the manufactured composite resin casting mould to achieve the smoothness as a mirror.
Compared with the prior art, the invention has the beneficial effects that: the process of a female die consisting of a female die and/or a male die is omitted, a base die (namely a casting sand mould) of a casting wood die or other non-metal dies can be directly processed and cast by a numerical control machine tool, and a diluent, a hardening agent and nano aluminum oxide are added into polyurethane, so that the polyurethane viscosity can be reduced while the wear resistance and hardness of the polyurethane are improved, the gel time is prolonged, the Shore hardness can still be kept as high as 65-70D, and the superior performance enables all gas and airless spraying equipment and even a common spray can to smoothly carry out spraying. In the process of carrying out secondary numerical control finish machining on the wear-resistant layer, the polyurethane material generates cutting and shredding, and is free of dust, environment-friendly and pollution-free.
The composite resin casting mould manufactured by the technical scheme of the invention comprises the following components: compared with the original polyurethane, the performance of the surface polyurethane layer is thoroughly changed, (1) the ultralow viscosity is reduced to 700-800 mPa s; (2) the ultra-long curing time is 50-60 min;
(3) the heat-resistant temperature reaches-60 to 120 ℃. (4) The wear resistance is 20-25 mg and exceeds that of alloy steel or high-carbon steel; (5) the modified polyurethane has excellent anti-sagging performance, and can be used for construction with 1mm without sagging after vertical spraying; (6) although the viscosity of the polyurethane is low and the gel time is long, the Shore hardness can still be kept as high as 65-70D; (7) the paint is suitable for all air and airless spraying equipment or manual brush coating, and even a common spray can smoothly finish construction.
The appearance of the cast wood mould is hardened, and the mould has a super-high wear-resistant and anti-corrosion coat, the performance of polyurethane in the form of soft and rigid is thoroughly embodied, the high wear-resistant performance of the mould exceeds that of alloy steel or high-carbon steel, and the mould is one of the emerging wear-resistant and anti-corrosion coating materials, and has extremely high market prospect.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the method for further manufacturing the composite resin casting mould with the wear-resistant and corrosion-resistant coating of 0.2-0.5mm comprises the following steps:
(1) processing a base die: adopting three-dimensional design, carrying out numerical control processing on the wood material to form a base die, reducing the size by 0.2-0.5mm, modifying the base die, sealing holes, smearing grease, grinding and polishing;
(2) spraying and brushing a bottom coating: e-44/6101 epoxy resin is sprayed on the surface of the base mold, and the thickness is 0.1-0.2 mm; the epoxy resin is E-44/6101 epoxy resin with Shore hardness of 90-95D. Because the base material of the non-metal molds such as the cast wood mold is soft, in order to enhance the hardness of the non-metal molds, high-hardness E-44/6101 epoxy resin (with Shore hardness of 90-95D) is adopted for spraying or brushing, the epoxy resin can be used as the surface of the non-metal molds such as the wood mold and the like and a transition layer of modified polyurethane, and the problem of poor adhesion of polyurethane is solved.
(3) Spraying and brushing a wear-resistant layer: preparing modified polyurethane, wherein the polyurethane is a product sold in the American Hensman chemical industry, A, B components are 6414A and 5117B, after the A component is kept at the constant temperature of 40 ℃ for 1 hour, diluent, hardening agent and nano-alumina are added according to the weight ratio of A, B mixed components of 22%, 0.9% and 2.5%, a stirrer of 60-1500 r/min is adopted to be uniformly mixed with the A component, the B component is used at the normal temperature (18-35 ℃), and A, B components are uniformly mixed and stirred according to the weight ratio of 100: 10; spraying modified polyurethane on the bottom coating, wherein the thickness is 0.1-0.4mm, and preparing a composite resin casting mold; the thickness of the size is reduced by 0.2-0.5mm to obtain a compensation;
(4) polishing: and (4) carrying out wax wiping and accurate polishing treatment on the manufactured composite resin casting mould to achieve the smoothness as a mirror.
Example 2:
the method for further manufacturing the composite resin casting mould with the corrosion resistance and the wear resistance exceeding the 3-5mm coating of alloy steel and high-carbon steel comprises the following steps:
(1) processing a base die: the three-dimensional design is adopted, numerical control processing is carried out on the wood material, the size is reduced by 3-5mm, the base die is modified, the sealing hole is smeared with grease, the base die is roughly processed, the surface is provided with a rough surface, and the adhesive force of the base die to epoxy resin can be enhanced;
(2) spraying and brushing a bottom coating: spraying epoxy resin on the surface of the base mold, wherein the thickness is 0.5-2 mm; e-44/6101 epoxy resin with high hardness (Shore hardness of 90-95D) is adopted for spraying or brushing, the epoxy resin can be used as the surface of non-metal molds such as wood molds and the like and the transition layer of modified polyurethane, and the problem of poor adhesion of polyurethane is solved;
(3) spraying and brushing a wear-resistant layer: preparing modified polyurethane, wherein the polyurethane is a product sold in the American Hounsfield chemical industry, A, B components are 6414A and 5117B, the A component is kept at the constant temperature of 40 ℃ for 1 hour, the A component is added with a diluent, a hardening agent and nano-alumina according to the weight ratio of 25%, 0.95% and 2.7% after being mixed with A, B components, the A component is uniformly mixed and stirred by adopting a stirrer of 60-1500 r/min, the B component is used at the normal temperature (18-35 ℃), and the A, B component is uniformly mixed and stirred according to the weight ratio of 100:12 for use;
spraying modified polyurethane on the bottom coating, wherein the thickness of the modified polyurethane is 2.5-6mm, a composite resin casting mold is manufactured, and the surplus 0.5-1 mm of the super-thick coating is the finishing allowance;
(4) finish machining: carrying out secondary numerical control fine machining on the preliminarily manufactured composite resin casting mould by adopting a PCD highlight milling cutter; because polyurethane belongs to elastomer high polymer materials, the rotational speed of 12000-24000 is generated during high-speed processing of the die, the phenomena of knife sticking and knife jumping can be generated by adopting metal processing cutters such as alloy cutters, high-speed steel milling cutters and the like, the phenomena of knife sticking and knife jumping during processing of the polyurethane can be solved by selecting PCD highlight milling cutters provided by Funanke superhard materials GmbH, and the apparent gloss of the polyurethane die is extremely high; in the process of carrying out secondary numerical control finish machining on the wear-resistant layer, the polyurethane material generates cutting and shredding, and is free of dust, environment-friendly and pollution-free;
(5) polishing: and (4) carrying out wax wiping and accurate polishing treatment on the manufactured composite resin casting mould to achieve the smoothness as a mirror.
And (3) performance verification:
table 1 shows the performance parameters of the blank and control groups tested according to the present invention.
The first group is blank group, products sold in the American Hounsfield chemical industry are 6414A and 5117B, and A, B components are mixed according to the weight ratio of 100:40 and then directly coated on the surface of the wood mould;
the second group is prepared by weighing 6414A and 5117B of products sold in the American Hensman chemical industry, A, B components according to the weight ratio of 100:40, adding PU-10 new-generation environment-friendly dilution modifier into the A component according to 20-25% of the mixed weight, mixing A, B components, and spraying the mixture on the surface of a wood mold by using a spray can;
the third group is prepared by weighing 6414A and 5117B of products sold in the American Hensman chemical industry, A, B components according to the weight ratio of 100:40, adding a hardening wear-resistant anti-scraping agent HR-8501 and nano alumina into the A component according to 0.8-1% and 2-3% of the mixed weight, mixing A, B components, and brushing the mixture on the surface of a wood mold;
and the fourth group is prepared by weighing 6414A and 5117B of products sold in the American Hensmei chemical industry, A, B components according to the weight ratio of 100:40, adding PU-10 new-generation environment-friendly dilution modifier, hardening wear-resistant anti-scraping agent HR-8501 and nano-alumina into the A component according to 20-25%, 0.8-1% and 2-3% of the mixed weight, and spraying the mixture on the surface of a wood mold by using a spray can after A, B components are mixed.
The composite resin casting mould manufactured by the technical scheme of the invention has the advantages that the surface polyurethane layer is thoroughly changed compared with the performance of the original polyurethane: (1) reducing the ultralow viscosity to 700-800 mPa s; (2) the ultra-long curing time is 50-60 min;
(3) the heat-resistant temperature reaches-60 to 120 ℃. (4) The wear resistance is 20-25 mg and exceeds that of alloy steel or high-carbon steel; (5) the modified polyurethane has excellent anti-sagging performance, and can be used for construction with 1mm without sagging after vertical spraying; (6) although the viscosity of the polyurethane is low and the gel time is long, the Shore hardness can still be kept as high as 65-70D; (7) the paint is suitable for all air and airless spraying equipment or manual brush coating, and even a common spray can smoothly finish construction.
| Unit of | First group | Second group | Third group | Fourth group | |
| Viscosity of the solution | mPa s | 5000~5500 | 500~600 | 6000~6500 | 700~800 |
| Operational time | min | 15~20 | 60~70 | 5~10 | 50~60 |
| Abrasion resistance (NEMA) | mg | 3~4 | 9~10 | 20~25 | 20~25 |
| Heat resistance temperature | ℃ | 55~60 | -40~90 | -60~120 | -60~120 |
| Shore hardness (D) (ISO868) | - | 65~70 | 45~50 | 70~75 | 65~70 |
TABLE 1
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A composite resin casting mold is characterized in that: the coating comprises a base mold, a bottom coating and a wear-resistant layer, wherein the bottom coating is made of epoxy resin; the wear-resistant layer is made of modified polyurethane.
2. A composite resin casting mold as defined in claim 1, wherein: the modified polyurethane comprises A, B two components, wherein the component A is isocyanate; the component B is polyhydric alcohol, the component A and the component B are mixed according to the weight ratio of 100: 5-100: 40 for use, and the component A further comprises a diluent, a hardening agent and nano aluminum oxide.
3. A composite resin casting mold as defined in claim 1, wherein: the base mold is made of non-metal materials, specifically wood, plastics, resin foaming materials or recyclable paper boards.
4. A composite resin casting mold as defined in claim 1, wherein: the weight ratio of the diluent, the hardening agent, the nano alumina and the A, B component after mixing is 20-25%, 0.8-1% and 2-3% respectively.
5. A composite resin casting mold as defined in claim 1, wherein: the diluent is a product sold in Zhang Jia hong Yuanbang chemical industry, and the model is a PU-10 new generation environment-friendly diluent modifier; the hardening agent is a product sold in Hongyui chemical industry of Dongguan, and the model is a hardening wear-resistant anti-scraping agent HR-8501; the nano-alumina is subjected to surface grafting modification treatment by adopting a silane coupling agent KH-550.
6. A composite resin casting mold as defined in claim 1, wherein: the epoxy resin is E-44/6101 epoxy resin with Shore hardness of 90-95D.
7. A method of making a composite resin casting mold as defined in claims 1 to 6,
the method comprises the following steps:
(1) processing a base die: adopting three-dimensional design, carrying out numerical control processing on wood, plastics and resin foaming materials or recyclable paperboard materials, reducing the size by 0.2-5mm, modifying a base die, and sealing holes and smearing greasiness;
(2) spraying and brushing a bottom coating: spraying epoxy resin on the surface of the base mold, wherein the thickness is 0.1-2 mm;
(3) spraying and brushing a wear-resistant layer: preparing modified polyurethane, namely after keeping the temperature of the component A at 40 ℃ for 1 hour, adding a diluent, a hardening agent and nano alumina into the component A according to the weight ratio of 20-25%, 0.8-1% and 2-3% after mixing with the component A, B, mixing and stirring the components uniformly with the component A, using the component B at normal temperature, mixing and stirring the components uniformly according to the weight ratio of A, B according to the mass ratio of 100: 5-100: 40; spraying modified polyurethane on the bottom coating, wherein the thickness is 0.1-6mm, and preparing a composite resin casting mold;
(4) polishing: and (4) carrying out wax wiping and accurate polishing treatment on the manufactured composite resin casting mould.
8. The method of manufacturing a composite resin casting mold according to claim 7,
the method comprises the following steps:
(1) processing a base die: adopting three-dimensional design, carrying out numerical control processing on wood, plastics and resin foaming materials or recyclable paperboard materials, reducing the size by 0.2-0.5mm, modifying a base die, sealing holes, smearing grease, grinding and polishing;
(2) spraying and brushing a bottom coating: spraying epoxy resin on the surface of the base mold, wherein the thickness is 0.1-0.2 mm; (3) spraying and brushing a wear-resistant layer: preparing modified polyurethane, namely after keeping the temperature of the component A at 40 ℃ for 1 hour, adding a diluent, a hardening agent and nano alumina into the component A according to the weight ratio of 20-25%, 0.8-1% and 2-3% after mixing with the component A, B, mixing and stirring the components A uniformly, using the component B at normal temperature, mixing and stirring the components A and B uniformly according to the weight ratio of A, B to 100: 10; spraying modified polyurethane on the bottom coating, wherein the thickness is 0.1-0.4mm, and preparing a composite resin casting mold;
(4) polishing: and (4) carrying out wax wiping and accurate polishing treatment on the manufactured composite resin casting mould.
9. The method of manufacturing a composite resin casting mold according to claim 7,
the method comprises the following steps:
(1) processing a base die: carrying out numerical control processing on wood, plastic and resin foaming materials or recyclable paperboard materials by adopting a three-dimensional design, reducing the size by 3-5mm, modifying a base die, and sealing holes and smearing greasiness;
(2) spraying and brushing a bottom coating: spraying epoxy resin on the surface of the base mold, wherein the thickness is 0.5-2 mm;
(3) spraying and brushing a wear-resistant layer: preparing modified polyurethane, namely after the component A is kept at the constant temperature of 40 ℃ for 1 hour, adding a diluent, a hardening agent and nano alumina into the component A according to the weight ratios of 20-25%, 0.8-1% and 2-3% after mixing with the component A, B, uniformly mixing and stirring the component A and the component A by adopting a stirrer of 60-1500 r/min, using the component B at normal temperature, and uniformly mixing and stirring the component A, B according to the weight ratio of 100: 12;
spraying modified polyurethane on the bottom coating, wherein the thickness is 2.5-6mm, and preparing a composite resin casting mold;
(4) finish machining: carrying out secondary numerical control fine machining on the preliminarily manufactured composite resin casting mould by adopting a PCD highlight milling cutter; (5) polishing: and (4) carrying out wax wiping and accurate polishing treatment on the manufactured composite resin casting mould to achieve the smoothness as a mirror.
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| CN111391190B (en) | 2022-02-15 |
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