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A Pressure Forming Process of Resin and Mineral Mixed Castings
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A molding process and resin technology, applied in the field of pressure molding process, can solve the problems of porosity, low density, low efficiency, etc., and achieve the effect of uniform color without color difference, uniform and smooth surface, and improved efficiency.
Active Publication Date: 2019-12-24
湖北耐创新材料洁具有限公司
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[0002] At present, the production process of castings containing artificial stone is cast through molds under normal temperature and pressure, because the reaction of the resin is not complete at room temperature, which easily leads to discoloration of the product surface
The production cycle of normal temperature curing is long, and one product is produced in one hour, which is inefficient; at the same time, because of the normal pressure, the proportion of resin must be more than 30%, not only the cost is high, the density is low, the surface hardness of the obtained casting is low, and pores are prone to occur Defects such as shrinkage and porosity, high resin content, and easy deformation of the product
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Embodiment 1
[0041] A pressure forming process for a water tank resin and mineral mixed casting, including:
[0042] Raw material mixing step: mix resin and granules and add additives, then heat and evacuate until complete defoaming to obtain material, the material is kept at a constant temperature of 50°C;
[0043] Injection step: Preheat the mold to 50°C and tilt it at 45°; inject the material into the cavity from the bottom of the mold under a pressure of 0.4MPa, and the material in the cavity begins to gel until the end of gelation (m-benzene The gelation temperature of neopentyl glycol polyester resin is 80°C, that is, the injection is stopped when the mold temperature rises to 80°C), and the material is continuously injected into the mold cavity, and the air in the mold cavity is released from the exhaust port above the mold Discharging; while injecting the material into the mold cavity, adjust the temperature of the mold to rise to 100°C at a rate of 4°C / min; after the injection is ...
Embodiment 2
[0054] A pressure forming process for a water tank resin and mineral mixed casting, including:
[0055] Raw material mixing step: mix resin and granules and add additives, then heat and evacuate until complete defoaming to obtain material, the material is kept at a constant temperature of 50°C;
[0056] Injection step: Preheat the mold to 60°C and tilt it at 45°; inject the material into the cavity from the bottom of the mold under a pressure of 0.6MPa, and the material in the cavity begins to gel until the end of gelation (Polymethanol) The gelation temperature of methyl acrylate is 80°C, that is, the injection is stopped when the mold temperature rises to 80°C), and the material is continuously injected into the mold cavity, and the air in the mold cavity is discharged from the exhaust port above the mold ;While injecting the material into the mold cavity, adjust the temperature of the mold to rise to 120°C at a rate of 4°C / min; after the injection is completed, place the mo...
Embodiment 3
[0071] The relationship between the viscosity change of the material and the temperature
[0072] Prepare materials with the raw materials and proportioning of Example 1. The viscosity of the material is tested under different temperature conditions, and the temperature-viscosity relationship curve is as follows: figure 1 shown. It can be seen from the figure that the increase in temperature can significantly reduce the viscosity of the resin, greatly improve the fluidity, and prevent the uneven distribution of particles due to the low viscosity of the material.
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Abstract
The invention discloses a pressure molding process of a resin and mineral mixed casting part. The pressure molding process comprises the following steps: a step of mixing raw materials: mixing resin with particles to obtain a mixture and adding additives into the mixture; then performing heating and vacuumizing until defoaming is completely carried out so as to obtain a material; a step of injecting the material: pre-heating a mould to 50 DEG C to 60 DEG C and inclining the mould; injecting the material into a mould cavity from the lower part of the mould under pressure of 0.2MPa to 0.6MPa, and continuously injecting the material into the mould cavity from the beginning of gelatinization of the material in the mould cavity to the ending of gelatinization of the material in the mould cavity; regulating a temperature of the mould and rising the temperature of the mould to 100 DEG C to 120 DEG C at a rising ratio of 1 DEG C / min to 4 DEG C / min while the material is injected into the mouldcavity at the same time; and a step of demoulding: opening the mould and taking a casting blank out, performing heat insulation and shaping on the casting blank at 60 DEG C to 80 DEG C, and then cooling to obtain a resin casting part. According to the molding process disclosed by the invention, through cooperation of temperature regulation and pressure setting, a shrinkage gap produced by curing can be filled preferably, and the surface of the obtained casting part has no defects.
Description
technical field [0001] The invention relates to a pressure molding process of a resin and mineral mixed casting, belonging to the technical field of injection molding. Background technique [0002] At present, the production process of castings containing artificial stone is cast through molds under normal temperature and pressure, because the reaction of the resin is not complete at room temperature, which may easily cause the surface of the product to change color. The production cycle of normal temperature curing is long, and one product is produced in one hour, which is inefficient; at the same time, because of the normal pressure, the proportion of resin must be more than 30%, not only the cost is high, the density is low, the surface hardness of the obtained casting is low, and pores are prone to occur Defects such as shrinkage and porosity, high resin content, and easy deformation of the product. Contents of the invention [0003] In order to overcome the deficienc...
Claims
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Application Information
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