CN113214577A - Hard polyvinyl chloride pipe fitting filled with superfine active calcium carbonate and preparation method thereof - Google Patents
Hard polyvinyl chloride pipe fitting filled with superfine active calcium carbonate and preparation method thereof Download PDFInfo
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- CN113214577A CN113214577A CN202110519949.2A CN202110519949A CN113214577A CN 113214577 A CN113214577 A CN 113214577A CN 202110519949 A CN202110519949 A CN 202110519949A CN 113214577 A CN113214577 A CN 113214577A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
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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
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
Abstract
The invention relates to a hard polyvinyl chloride pipe fitting filled with superfine active calcium carbonate and a preparation method thereof. The mixture after the hot mixing needs to be slowly stirred for a plurality of minutes from high speed to low speed in a hot mixing device, and then is discharged into a cold mixing device for cold mixing, so that the phenomenon of short injection of the product in the production process can be effectively avoided; the mixed powder is melted and extruded by an extruder and then is sent to an injection molding machine for injection molding production, so that the generation of cold spots of the product can be reduced; the temperature of an extruder cylinder of the granulation equipment is controlled at 155-165 ℃, and the temperature of the confluence core area is always 4-6 ℃ lower than that of a first area, a second area, a third area and a die area of the extruder cylinder, so that the generation of black lines of a product can be reduced; the product produced by the drying and dehumidifying step is added, so that the surface quality is high and no bubbles are generated.
Description
Technical Field
The invention relates to the technical field of polyvinyl chloride materials, in particular to a hard polyvinyl chloride pipe fitting filled with superfine active calcium carbonate and a preparation method thereof.
Background
At present, the specification and the model of injection molding hard polyvinyl chloride (PVC-U) pipe fittings applied to building materials are very various, so that enterprises in the upstream of the current production need to bear the production of various products with various specifications. Under the automatic production scale of a plurality of rigid polyvinyl chloride (PVC-U) pipe fittings manufacturing enterprises at present, the adopted centralized feeding system is likely to meet hundreds of rigid polyvinyl chloride (PVC-U) pipe fittings products with different specifications on the basis of one formula system.
The hard polyvinyl chloride (PVC-U) pipe product is different from a hard polyvinyl chloride (PVC-U) pipe product, the specification of the hard polyvinyl chloride pipe is single, a mold is simple, but the polyvinyl chloride (PVC-U) pipe product has various types, the mold structure of the forming appearance is complex, the requirement on the dimensional accuracy is higher, and even a certain type of product has the compact requirement of a metal insert, so that the injection molding hard polyvinyl chloride (PVC-U) pipe has extremely high requirement on a formula system, and the required formula system has to meet the production of hundreds of products in both stability and fluidity.
In the formula system of the traditional rigid polyvinyl chloride (PVC-U) pipe fitting for building materials, a certain proportion of common light calcium carbonate is often adopted as filling so as to improve the heat resistance and the dimensional stability of the product. The common light calcium carbonate has the conditions of high oil absorption value and large index range value change, so that the condition that the dosage of other auxiliary agent components in a formula is high or low is influenced, the instability of the formula components also influences the plasticizing quality of materials used for production equipment, influences the stability and the fluidity of a plasticized material, further easily generates the phenomena of color deviation, cold spots, black lines and the like in a product, and simultaneously reduces the mechanical property of a hard polyvinyl chloride (PVC-U) pipe fitting.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the rigid polyvinyl chloride pipe fitting filled with the superfine activated calcium carbonate, which can be used in building facilities such as civil houses, office buildings, factory buildings and the like, has good drop resistance and impact resistance and can effectively improve the physical properties and service life of rigid polyvinyl chloride pipe fitting products, and the preparation method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the superfine active calcium carbonate filled rigid polyvinyl chloride pipe fitting is prepared from the following raw materials in parts by weight: 90-110 parts of polyvinyl chloride resin powder, 7-10 parts of superfine active calcium carbonate, 5-5.5 parts of stabilizer, 3.5-4 parts of impact resistance agent, 0.2-0.3 part of lubricant, 1-1.5 parts of processing flowing agent and 3-4 parts of titanium dioxide.
Further, the hard polyvinyl chloride pipe fitting filled with the superfine active calcium carbonate is prepared from the following raw materials in parts by weight: 100 parts of polyvinyl chloride resin powder, 8 parts of superfine active calcium carbonate, 5.2 parts of stabilizer, 3.7 parts of impact resistance agent, 0.25 part of lubricant, 1.2 parts of processing flowing agent and 3.5 parts of titanium dioxide.
Further, the stabilizer is a calcium zinc stabilizer.
Further, the impact resistant agent is an acrylate impact resistant agent.
The application also provides a preparation method of the hard polyvinyl chloride pipe fitting filled with the superfine active calcium carbonate, which comprises the following steps:
(1) weighing: weighing raw materials for forming the rigid polyvinyl chloride pipe fitting according to the proportion;
(2) primary heat mixing: putting the raw materials for forming the rigid polyvinyl chloride pipe fitting into mixing equipment for hot mixing, wherein the temperature of primary hot mixing is 115-120 ℃, the rotating speed is 1350-1450 r/min, and the time is 10-15 min;
(3) secondary thermal mixing: immediately carrying out secondary thermal mixing after the primary thermal mixing is finished, wherein the temperature of the secondary thermal mixing is 117-122 ℃, the rotating speed is 400-500 r/min, and the time is 2.5-3.5 min, so as to obtain a thermal mixed material;
(4) cold mixing: putting the hot mixed material into a cold mixer at the temperature of 55-60 ℃, and performing cold mixing for 15-20 min to obtain a cold mixed material;
(5) and (3) extruding and granulating: adding the cold mixture into an extruder for granulation to obtain a granular material; the temperature of a machine barrel of the extruder is 155-165 ℃; the temperature of the die confluence core area is 155-160 ℃, the temperature of the die opening area is 160-165 ℃, and the temperature of the die confluence core area is always 4-6 ℃ lower than that of the first area, the second area, the third area and the die opening area of the machine barrel;
(6) drying and dehumidifying: drying and dehumidifying the granular material for 1.5-2 h at the temperature of 70-80 ℃ to obtain dried granular material;
(7) molding: and (3) feeding the dried granules into an injection molding machine, and molding to obtain the hard polyvinyl chloride pipe fitting filled with the superfine activated calcium carbonate.
Further, the raw materials for forming the rigid polyvinyl chloride pipe fitting are placed into a mixing device to be subjected to hot mixing in the step (2), the temperature of the first hot mixing is 118 ℃, the rotating speed is 1400r/min, and the time is 13 min.
Further, in the step (3), after the primary thermal mixing is finished, performing secondary thermal mixing immediately, wherein the temperature of the secondary thermal mixing is 120 ℃, the rotating speed is 450r/min, and the time is 3.0min, so as to obtain a thermal mixed material.
Further, in the step (4), the hot mixture is placed at the temperature of 58 ℃ for cold mixing, and the cold mixing time is 18min, so that a cold mixture is obtained.
Further, in the step (5), the temperatures of the first zone, the second zone and the third zone of the extruder cylinder are 162 ℃, the temperature of the fourth zone of the extruder cylinder is 158 ℃, the temperature of the die confluence zone is 157 ℃, and the temperature of the die orifice zone is 162 ℃.
Further, in the step (6), the granular material is placed at the temperature of 75 ℃ for drying and dehumidifying for 1.8h, so that dried granular material is obtained.
The invention relates to a hard polyvinyl chloride pipe fitting filled with superfine active calcium carbonate and a preparation method thereof, on the basis of a formula taking the original common light calcium carbonate as a filler, the superfine active calcium carbonate is used for replacing the common light calcium carbonate as the filler, and the use amount of other auxiliary agent components is reduced under the condition of keeping the filling part unchanged; the method specifically comprises the following steps: the traditional formula is as follows: 90-110 parts of polyvinyl chloride resin powder, 7-10 parts of common light calcium carbonate, 5-5.5 parts of stabilizer, 4.5-5.5 parts of impact resistance agent, 0.35-0.45 part of lubricant, 1.8-2.5 parts of processing flowing agent and 3-4 parts of titanium dioxide; the formula of the application is as follows: 90-110 parts of polyvinyl chloride resin powder, 7-10 parts of superfine active calcium carbonate, 5-5.5 parts of stabilizer, 3.5-4 parts of impact resistance agent, 0.2-0.3 part of lubricant, 1-1.5 parts of processing flowing agent and 3-4 parts of titanium dioxide; therefore, compared with the existing formula, the formula of the composite material obviously reduces the dosage of the impact resistance agent, the lubricant and the processing flow agent, and reduces the formula cost; the superfine active calcium carbonate replaces the common light calcium carbonate and has the advantages that: the superfine active calcium carbonate filler obtained after the morphology control and the surface activation modification can keep the interface bonding strength with the polyvinyl chloride resin powder of the composite main material in a reasonable range, and has good bonding strength with the polyvinyl chloride resin powder, so that the comprehensive mechanical property of the used composite material is enhanced; the larger the oil absorption of the common light calcium carbonate filler is, the larger the addition amount of other additives in the formula is correspondingly obtained to make up for other additives which are absorbed by the filler but can not play a role, generally, the oil absorption value of the common light calcium carbonate is 60-80ml/100g, the oil absorption value of the superfine activated calcium carbonate used in the invention is 20-25ml/100g, as the superfine activated nano calcium carbonate is used as the filler, the capillary adsorption among powder particle gaps and the powder flowability are good, the oil absorption value is small, the smaller the particle surface energy is, the smaller the oil absorption value is, therefore, in the material of the composite ingredient, the lower the oil absorption value is, the lower the dosage of other corresponding additives can be reduced, and the effect of reducing the formula cost can be achieved;
description of the reduction in the amount of impact modifier: the ultrafine active calcium carbonate is used as the filler of the inorganic rigid polyvinyl chloride (PVC-U) pipe fitting, the dispersibility of the ultrafine active calcium carbonate is strong, the problem of unstable product quality caused by the phenomena that ultrafine calcium carbonate powder is easy to agglomerate and the material mixing is not uniform in the material mixing process is solved, the interface adhesion among the polyvinyl chloride resin powder, the ultrafine active calcium carbonate powder and the impact resistant agent powder is more balanced and tighter, the mechanical property of the rigid polyvinyl chloride (PVC-U) pipe fitting product is greatly improved, and therefore the dosage of the impact resistant agent can be reduced and the requirements of a falling experiment in national standards can be completely met;
description of the reduction in lubricant amount: the superfine active calcium carbonate is used as the filler of an inorganic hard polyvinyl chloride (PVC-U) pipe fitting, the superfine active calcium carbonate is subjected to surface activation modification, the surface of the calcium carbonate is covered by modified molecules, gaps in particles are reduced, the surface performance of the calcium carbonate is changed by the covering, the surface polarity of the calcium carbonate is weakened, the friction force among the particles is reduced, and the lubricating property is better; therefore, the invention can reduce the dosage of the internal lubricant in the formula system and can also achieve the effect of improving the surface smoothness of the product;
description of reduction of processing flow agent: the invention adopts the superfine active calcium carbonate as the filler of the inorganic rigid polyvinyl chloride (PVC-U) pipe, the calcium carbonate is activated and modified to reduce aggregated particles, improve the dispersity, obviously increase the bulk density and obviously reduce the oil absorption value, the addition of the processing flowing agent can be simultaneously reduced while the plasticizing process of the melting material is promoted, and the addition of other additives can be correspondingly reduced by adding the smaller oil absorption of the calcium carbonate filler to make up other additives which are absorbed by the filler and can not play a role, so the dosage of the processing flowing agent in a formula system can be reduced, and the effect of good fluidity of the raw materials in a melting state can be ensured.
According to the invention, the mixing process of various injection molding hard polyvinyl chloride pipe fittings generally adopts hot mixing and then immediately discharges the hot mixed hard polyvinyl chloride pipe fittings into a cold mixer for further mixing, but various auxiliaries are not fully mixed and do not play a role, so that the injection molding amount of the product in the production process is easy to be unstable, and the injection molding failure of the product occurs; this application hot mixing's compounding needs to be followed high-speed the low-speed down at hot mixing equipment and slowly stirred after several minutes, cold mixing equipment carries out cold mixing again of discharging into, both static electricity has been eliminated, the mobility of dry blend improves, can improve the glossiness of extruding the granule again, because the easy absorption auxiliary agent granule of PVC granule that the inflation becomes big, can be better with the abundant looks blending of superfine active calcium carbonate, the granule size tends to the homogeneous mixing, the apparent density of dry blend increases rapidly, be favorable to extruding the improvement of granulation output and reduce the air displacement, can let various auxiliaries give full play to its effect, be favorable to the production stability of product, the phenomenon of product short notes appears in avoiding the production process.
According to the superfine active calcium carbonate filled rigid polyvinyl chloride pipe fitting and the preparation method thereof, various machines for injection molding rigid polyvinyl chloride pipe fitting products can be directly added with powder materials in a mixed formula for production, and the process flow is very easy to cause the products to generate cold spots; this application extrudes the powder mixture through the extruder melting earlier, send into the injection molding machine again after cutting into the granule material and carry out the production of moulding plastics, and the formula material that mixes this moment is through preheating plastify processing back, and the melting material can be more even after once plastify melting for multiclass hard polyvinyl chloride pipe fitting product production material is mobile good, reduces the production of product cold spot, improves its product property ability.
The invention relates to a hard polyvinyl chloride pipe fitting filled with superfine active calcium carbonate and a preparation method thereof, wherein the confluence core temperature of various extrusion granulators is equal to the cylinder temperature and the mouth mold temperature, no step change exists, and the produced injection molding hard polyvinyl chloride pipe fitting product is easy to generate black lines; when this application replaces ordinary light calcium carbonate with superfine active calcium carbonate, will extrude the temperature in granulation confluence core district again and control 4-6 ℃ lower than the temperature in barrel one district, two districts, three districts and die zone all the time, the granulation material of output this moment is more closely knit, and the surface quality of the PVC-U pipe fitting product that the later stage was moulded plastics out is very high, improves injection moulding performance, and reduces the production of product black line.
According to the superfine active calcium carbonate filled rigid polyvinyl chloride pipe fitting and the preparation method thereof, early-stage materials of various rigid polyvinyl chloride pipe fitting products cannot be dehumidified and dried, a certain amount of water often exists in the raw materials, and the produced rigid polyvinyl chloride pipe fitting products are easy to generate a bubble condition, so that the appearance of the products is influenced; drying and dehumidifying step is add to this application, and the drying and dehumidifying step is used for dehumidifying and drying a small amount of moisture in the raw materials, and the surface quality of the hard polyvinyl chloride pipe fitting product of output, especially thick wall product this moment has obvious improvement, and no bubble produces.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Fig. 2 is a picture of a rigid pvc pipe prepared in example 1 of the present invention, with product names: and (6) performing 110 vertical examination.
Fig. 3 is a picture of a rigid pvc pipe prepared in example 1 of the present invention, with product names: 110 are straight through.
Fig. 4 is a picture of a rigid pvc pipe prepared in example 1 of the present invention, with product names: 110x75H type.
Fig. 5 is a picture of a rigid pvc pipe prepared in example 1 of the present invention, with product names: a tee with a diameter of 40 multiplied by 25.
Fig. 6 is a picture of a rigid pvc pipe prepared in example 4 of the present invention, with product names: and (6) performing 110 vertical examination.
Fig. 7 is a picture of a rigid pvc pipe prepared in example 5 of the present invention, with product names: 110 are straight through.
Fig. 8 is a picture of a rigid pvc pipe prepared in example 6 of the present invention, with product names: 110x75H type.
Fig. 9 is a photograph of a rigid pvc pipe prepared in example 7 of the present invention, with product names: a tee with a diameter of 40 multiplied by 25.
Detailed Description
The following examples may help one skilled in the art to more fully understand the present invention, but are not intended to limit the invention in any way.
Example 1
A preparation method of a hard polyvinyl chloride pipe fitting filled with superfine active calcium carbonate comprises the following steps:
(1) weighing: weighing the raw materials for forming the hard polyvinyl chloride pipe fitting according to the ratio, wherein the raw materials for forming the hard polyvinyl chloride pipe fitting are as follows: 270 kg of polyvinyl chloride resin powder, 21 kg of superfine active calcium carbonate, 15 kg of a calcium zinc stabilizer, 10.5 kg of an acrylate shock resistant agent, 0.6 kg of a lubricant, 3 kg of a processing flowing agent and 9 kg of titanium dioxide;
(2) primary heat mixing: putting the raw materials for forming the rigid polyvinyl chloride pipe fitting into mixing equipment for hot mixing, wherein the temperature of primary hot mixing is 115 ℃, the rotating speed is 1350r/min, and the time is 10 min;
(3) secondary thermal mixing: immediately carrying out secondary thermal mixing after the primary thermal mixing is finished, wherein the temperature of the secondary thermal mixing is 117 ℃, the rotating speed is 400r/min, and the time is 2.5min, so as to obtain a thermal mixed material;
(4) cold mixing: putting the hot mixed material into a temperature of 55 ℃ for cold mixing for 15min to obtain a cold mixed material;
(5) and (3) extruding and granulating: adding the cold mixture into an extruder for granulation to obtain a granular material; the temperatures of a first zone, a second zone and a third zone of the cylinder of the extruder are all 160 ℃, and the temperature of a fourth zone of the cylinder of the extruder is 155 ℃; the temperature of the die confluence core area is 156 ℃, the temperature of the die orifice area is 160 ℃, and the temperature of the die confluence core area is always 4 ℃ lower than that of the first area, the second area, the third area and the die orifice area of the machine barrel;
(6) drying and dehumidifying: drying and dehumidifying the granular material at the temperature of 70 ℃ for 1.5h to obtain dried granular material;
(7) molding: respectively sending the dried granules into an injection molding machine 1 for producing 110 vertical inspection, an injection molding machine 2 for producing 110 straight-through, an injection molding machine 3 for producing 110x75H type and an injection molding machine 4 for producing 40 x 25 reducing tee joint through pipelines, and molding to obtain the ultra-fine activated calcium carbonate filled rigid polyvinyl chloride pipe fittings which are respectively as follows: 110 vertical inspection, 110 straight-through, 110x75H type, 40 x 25 reducing tee.
The mixing equipment used in this example was produced by yili limited, zhang gang city, and the model number was: SRL-Z1000/2500; the extruder used was a model number of a product of Zhang hong bell mechanical limited: BRZ 80/156; the injection molding machine used was a model number of 250T/300T manufactured by Haitian Plastic machine group Co.
The polyvinyl chloride resin powder used in this example was obtained from Yibin Tianyuan group, Ltd., SG-8 type, and had a density of 1.38 to 1.40g/cm3。
The superfine active calcium carbonate used in the example is purchased from Guangxi and American New Material science and technology Limited, the activation degree is more than or equal to 95 percent, and the average grain diameter is 1.2-2.5 mu m.
The calcium zinc stabilizer used in this example was purchased from Guangdong Xinda New Material science and technology, Inc., and the product grade was industrial grade.
The acrylic impact modifier used in the present example is obtained from Shandong Ruifeng Polymer materials Co., Ltd, and has a molecular weight of 30000-60000 and a pH of 6-8.
The lubricant used in the example is purchased from Guangdong Huanji chemical Co., Ltd, has a softening point of 103-106 ℃ and a density of 0.94-0.96 g/cm3。
The process flow agent used in this example was purchased from new environmental protection materials, inc, and the product grade was industrial grade.
The titanium dioxide used in this example was purchased from the dragon boa herbori ltd, R-type, density 4.26g/cm3, refractive index 2.72.
The surface observation results of the rigid polyvinyl chloride pipe produced in this example are shown in Table 1 below
TABLE 1
| Product name | Whether or not cold spots are generated | Whether black lines are generated | Whether or not to generate bubbles | Whether or not to generate short notes |
| 110 vertical examination | Whether or not | Whether or not | Whether or not | Whether or not |
| 110 straight-through | Whether or not | Whether or not | Whether or not | Whether or not |
| 110x75H model | Whether or not | Whether or not | Whether or not | Whether or not |
| 40X 25 reducing tee | Whether or not | Whether or not | Whether or not | Whether or not |
Example 2
A preparation method of a hard polyvinyl chloride pipe fitting filled with superfine active calcium carbonate comprises the following steps:
(1) weighing: weighing the raw materials for forming the hard polyvinyl chloride pipe fitting according to the ratio, wherein the raw materials for forming the hard polyvinyl chloride pipe fitting are as follows: 330 kg of polyvinyl chloride resin powder, 30 kg of superfine active calcium carbonate, 16.5 kg of a calcium zinc stabilizer, 12 kg of an acrylic ester impact modifier, 0.9 kg of a lubricant, 4.5 kg of a processing flowing agent and 12 kg of titanium dioxide;
(2) primary heat mixing: putting the raw materials for forming the hard polyvinyl chloride pipe fitting into mixing equipment for hot mixing, wherein the temperature of primary hot mixing is 120 ℃, the rotating speed is 1450r/min, and the time is 15 min;
(3) secondary thermal mixing: immediately carrying out secondary thermal mixing after the primary thermal mixing is finished, wherein the temperature of the secondary thermal mixing is 122 ℃, the rotating speed is 500r/min, and the time is 3.5min, so as to obtain a thermal mixed material;
(4) cold mixing: putting the hot mixed material into a condition of 60 ℃ for cold mixing, wherein the time of cold mixing is 20min, and obtaining a cold mixed material;
(5) and (3) extruding and granulating: adding the cold mixture into an extruder for granulation to obtain a granular material; the temperature of the first zone, the second zone and the third zone of the extruder cylinder is 165 ℃, and the temperature of the fourth zone of the extruder cylinder is 160 ℃; the temperature of the die confluence core area is 159 ℃, the temperature of the die orifice area is 165 ℃, and the temperature of the die confluence core area is always 6 ℃ lower than that of the first area, the second area, the third area and the die orifice area of the machine barrel;
(6) drying and dehumidifying: drying and dehumidifying the granular material at the temperature of 80 ℃ for 2h to obtain dried granular material;
(7) molding: respectively sending the dried granules into an injection molding machine 1 for producing 110 vertical inspection, an injection molding machine 2 for producing 110 straight-through, an injection molding machine 3 for producing 110x75H type and an injection molding machine 4 for producing 40 x 25 reducing tee joint through pipelines, and molding to obtain the ultra-fine activated calcium carbonate filled rigid polyvinyl chloride pipe fittings which are respectively as follows: 110 vertical inspection, 110 straight-through, 110x75H type, 40 x 25 reducing tee.
The mixing equipment used in this example was produced by yili limited, zhang gang city, and the model number was: SRL-Z1000/2500; the extruder used was a model number of a product of Zhang hong bell mechanical limited: BRZ 80/156; the injection molding machine used was a model number of 250T/300T manufactured by Haitian Plastic machine group Co.
The polyvinyl chloride resin powder used in this example was obtained from Yibin Tianyuan group, Ltd., SG-8 type, and had a density of 1.38 to 1.40g/cm3。
The superfine active calcium carbonate used in the example is purchased from Guangxi and American New Material science and technology Limited, the water content is 0.05 percent, and the pH value is 7-8.
The calcium zinc stabilizer used in this example was purchased from Guangdong Xinda New Material science and technology, Inc., and the product grade was industrial grade.
The acrylic impact modifier used in the present example is obtained from Shandong Ruifeng Polymer materials Co., Ltd, and has a molecular weight of 30000-60000 and a pH of 6-8.
The lubricant used in the example is purchased from Guangdong Huanji chemical Co., Ltd, has a softening point of 103-106 ℃ and a density of 0.94-0.96 g/cm3。
The process flow agent used in this example was purchased from new environmental protection materials, inc, and the product grade was industrial grade.
The titanium dioxide used in this example was purchased from the dragon boa herbori ltd, R-type, density 4.26g/cm3, refractive index 2.72.
The surface observation results of the rigid polyvinyl chloride pipe produced in this example are shown in Table 2 below
TABLE 2
| Product name | Whether or not cold spots are generated | Whether black lines are generated | Whether or not to generate bubbles | Whether or not to generate short notes |
| 110 vertical examination | Whether or not | Whether or not | Whether or not | Whether or not |
| 110 straight-through | Whether or not | Whether or not | Whether or not | Whether or not |
| 110x75H model | Whether or not | Whether or not | Whether or not | Whether or not |
| 40X 25 reducing tee | Whether or not | Whether or not | Whether or not | Whether or not |
Example 3
A preparation method of a hard polyvinyl chloride pipe fitting filled with superfine active calcium carbonate comprises the following steps:
(1) weighing: weighing the raw materials for forming the hard polyvinyl chloride pipe fitting according to the ratio, wherein the raw materials for forming the hard polyvinyl chloride pipe fitting are as follows: 300 kg of polyvinyl chloride resin powder, 24 kg of superfine active calcium carbonate, 15.6 kg of calcium zinc stabilizer, 11.1 kg of acrylate impact modifier, 0.75 kg of lubricant, 3.6 kg of processing flowing agent and 10.5 kg of titanium dioxide;
(2) primary heat mixing: putting the raw materials for forming the rigid polyvinyl chloride pipe fitting into mixing equipment for hot mixing, wherein the temperature of primary hot mixing is 118 ℃, the rotating speed is 1400r/min, and the time is 13 min;
(3) secondary thermal mixing: immediately carrying out secondary thermal mixing after the primary thermal mixing is finished, wherein the temperature of the secondary thermal mixing is 120 ℃, the rotating speed is 450r/min, and the time is 3.0min, so as to obtain a thermal mixed material;
(4) cold mixing: putting the hot mixed material into a condition of 58 ℃ for cold mixing, wherein the time of cold mixing is 18min, and obtaining a cold mixed material;
(5) and (3) extruding and granulating: adding the cold mixture into an extruder for granulation to obtain a granular material; the temperatures of the first zone, the second zone and the third zone of the extruder cylinder are 162 ℃, and the temperature of the fourth zone of the extruder cylinder is 158 ℃; the temperature of the die confluence core area is 157 ℃, the temperature of the die opening area is 162 ℃, and the temperature of the die confluence core area is always lower than the temperatures of the first area, the second area, the third area and the die opening area of the machine barrel by 5 ℃;
(6) drying and dehumidifying: drying and dehumidifying the granular material at the temperature of 75 ℃ for 1.8h to obtain dried granular material;
(7) molding: respectively sending the dried granules into an injection molding machine 1 for producing 110 vertical inspection, an injection molding machine 2 for producing 110 straight-through, an injection molding machine 3 for producing 110x75H type and an injection molding machine 4 for producing 40 x 25 reducing tee joint through pipelines, and molding to obtain the ultra-fine activated calcium carbonate filled rigid polyvinyl chloride pipe fittings which are respectively as follows: 110 vertical inspection, 110 straight-through, 110x75H type, 40 x 25 reducing tee.
The mixing equipment used in this example was produced by yili limited, zhang gang city, and the model number was: SRL-Z1000/2500; the extruder used was a model number of a product of Zhang hong bell mechanical limited: BRZ 80/156; the injection molding machine used was a model number of 250T/300T manufactured by Haitian Plastic machine group Co.
The polyvinyl chloride resin powder used in this example was obtained from Yibin Tianyuan group, Ltd., SG-8 type, and had a density of 1.38 to 1.40g/cm3。
The superfine active calcium carbonate used in the example is purchased from Guangxi and American New Material science and technology Limited, the water content is 0.05 percent, and the pH value is 7-8.
The calcium zinc stabilizer used in this example was purchased from Guangdong Xinda New Material science and technology, Inc., and the product grade was industrial grade.
The acrylic impact modifier used in the present example is obtained from Shandong Ruifeng Polymer materials Co., Ltd, and has a molecular weight of 30000-60000 and a pH of 6-8.
The lubricant used in the example is purchased from Guangdong Huanji chemical Co., Ltd, has a softening point of 103-106 ℃ and a density of 0.94-0.96 g/cm3。
The process flow agent used in this example was purchased from new environmental protection materials, inc, and the product grade was industrial grade.
The titanium dioxide used in this example was purchased from the dragon boa herbori ltd, R-type, density 4.26g/cm3, refractive index 2.72.
The surface observation results of the rigid polyvinyl chloride pipe produced in this example are shown in Table 3 below
TABLE 3
| Product name | Whether or not cold spots are generated | Whether black lines are generated | Whether or not to generate bubbles | Whether or not to generate short notes |
| 110 vertical examination | Whether or not | Whether or not | Whether or not | Whether or not |
| 110 straight-through | Whether or not | Whether or not | Whether or not | Whether or not |
| 110x75H model | Whether or not | Whether or not | Whether or not | Whether or not |
| 40X 25 reducing tee | Whether or not | Whether or not | Whether or not | Whether or not |
Example 4
A preparation method of a hard polyvinyl chloride pipe fitting filled with superfine active calcium carbonate comprises the following steps:
(1) weighing: weighing the raw materials for forming the hard polyvinyl chloride pipe fitting according to the ratio, wherein the raw materials for forming the hard polyvinyl chloride pipe fitting are as follows: 300 kg of polyvinyl chloride resin powder, 24 kg of superfine active calcium carbonate, 15.6 kg of calcium zinc stabilizer, 11.1 kg of acrylate impact modifier, 0.75 kg of lubricant, 3.6 kg of processing flowing agent and 10.5 kg of titanium dioxide;
(2) primary heat mixing: putting the raw materials for forming the hard polyvinyl chloride pipe fitting into mixing equipment for hot mixing, wherein the temperature of primary hot mixing is 118 ℃, the rotating speed is 1400r/min, and the time is 13min, so as to obtain a hot mixed material;
(3) cold mixing: putting the hot mixed material into a condition of 58 ℃ for cold mixing, wherein the time of cold mixing is 18min, and obtaining a cold mixed material;
(4) and (3) extruding and granulating: adding the cold mixture into an extruder for granulation to obtain a granular material; the temperatures of the first zone, the second zone and the third zone of the extruder cylinder are 162 ℃, and the temperature of the fourth zone of the extruder cylinder is 158 ℃; the temperature of the die confluence core area is 157 ℃, the temperature of the die opening area is 162 ℃, and the temperature of the die confluence core area is always lower than the temperatures of the first area, the second area, the third area and the die opening area of the machine barrel by 5 ℃;
(5) drying and dehumidifying: drying and dehumidifying the granular material at the temperature of 75 ℃ for 1.8h to obtain dried granular material;
(6) molding: respectively sending the dried granules into an injection molding machine 1 for producing 110 vertical inspection, an injection molding machine 2 for producing 110 straight-through, an injection molding machine 3 for producing 110x75H type and an injection molding machine 4 for producing 40 x 25 reducing tee joint through pipelines, and molding to obtain the ultra-fine activated calcium carbonate filled rigid polyvinyl chloride pipe fittings which are respectively as follows: 110 vertical inspection, 110 straight-through, 110x75H type, 40 x 25 reducing tee.
The mixing equipment used in this example was produced by yili limited, zhang gang city, and the model number was: SRL-Z1000/2500; the extruder used was a model number of a product of Zhang hong bell mechanical limited: BRZ 80/156; the injection molding machine used was a model number of 250T/300T manufactured by Haitian Plastic machine group Co.
The polyvinyl chloride resin powder used in this example was obtained from Yibin Tianyuan group, Ltd., SG-8 type, and had a density of 1.38 to 1.40g/cm3。
The superfine active calcium carbonate used in the example is purchased from Guangxi and American New Material science and technology Limited, the water content is 0.05 percent, and the pH value is 7-8.
The calcium zinc stabilizer used in this example was purchased from Guangdong Xinda New Material science and technology, Inc., and the product grade was industrial grade.
The acrylic impact modifier used in the present example is obtained from Shandong Ruifeng Polymer materials Co., Ltd, and has a molecular weight of 30000-60000 and a pH of 6-8.
The lubricant used in the example is purchased from Guangdong Huanji chemical Co., Ltd, has a softening point of 103-106 ℃ and a density of 0.94-0.96 g/cm3。
The process flow agent used in this example was purchased from new environmental protection materials, inc, and the product grade was industrial grade.
The titanium dioxide used in this example was purchased from the dragon boa herbori ltd, R-type, density 4.26g/cm3, refractive index 2.72.
The surface observation results of the rigid polyvinyl chloride pipe produced in this example are shown in Table 4 below
TABLE 4
| Product name | Whether or not cold spots are generated | Whether black lines are generated | Whether or not to generate bubbles | Whether or not to generate short notes |
| 110 vertical examination | Whether or not | Whether or not | Whether or not | Is provided with |
| 110 straight-through | Whether or not | Whether or not | Whether or not | Is provided with |
| 110x75H model | Whether or not | Whether or not | Whether or not | Is provided with |
| 40X 25 reducing tee | Whether or not | Whether or not | Whether or not | Is provided with |
Example 5
A preparation method of a hard polyvinyl chloride pipe fitting filled with superfine active calcium carbonate comprises the following steps:
(1) weighing: weighing the raw materials for forming the hard polyvinyl chloride pipe fitting according to the ratio, wherein the raw materials for forming the hard polyvinyl chloride pipe fitting are as follows: 300 kg of polyvinyl chloride resin powder, 24 kg of superfine active calcium carbonate, 15.6 kg of calcium zinc stabilizer, 11.1 kg of acrylate impact modifier, 0.75 kg of lubricant, 3.6 kg of processing flowing agent and 10.5 kg of titanium dioxide;
(2) primary heat mixing: putting the raw materials for forming the rigid polyvinyl chloride pipe fitting into mixing equipment for hot mixing, wherein the temperature of primary hot mixing is 118 ℃, the rotating speed is 1400r/min, and the time is 13 min;
(3) secondary thermal mixing: immediately carrying out secondary thermal mixing after the primary thermal mixing is finished, wherein the temperature of the secondary thermal mixing is 120 ℃, the rotating speed is 450r/min, and the time is 3.0min, so as to obtain a thermal mixed material;
(4) cold mixing: putting the hot mixed material into a condition of 58 ℃ for cold mixing, wherein the time of cold mixing is 18min, and obtaining a cold mixed material;
(5) drying and dehumidifying: putting the cold mixture into a condition of 75 ℃ for drying and dehumidifying for 1.8h to obtain a dry mixture;
(6) molding: respectively sending the dried granules into an injection molding machine 1 for producing 110 vertical inspection, an injection molding machine 2 for producing 110 straight-through, an injection molding machine 3 for producing 110x75H type and an injection molding machine 4 for producing 40 x 25 reducing tee joint through pipelines, and molding to obtain the ultra-fine activated calcium carbonate filled rigid polyvinyl chloride pipe fittings which are respectively as follows: 110 vertical inspection, 110 straight-through, 110x75H type, 40 x 25 reducing tee.
The mixing equipment used in this example was produced by yili limited, zhang gang city, and the model number was: SRL-Z1000/2500; the extruder used was a model number of a product of Zhang hong bell mechanical limited: BRZ 80/156; the injection molding machine used was a model number of 250T/300T manufactured by Haitian Plastic machine group Co.
The polyvinyl chloride resin powder used in this example was obtained from Yibin Tianyuan group, Ltd., SG-8 type, and had a density of 1.38 to 1.40g/cm3。
The superfine active calcium carbonate used in the example is purchased from Guangxi and American New Material science and technology Limited, the water content is 0.05 percent, and the pH value is 7-8.
The calcium zinc stabilizer used in this example was purchased from Guangdong Xinda New Material science and technology, Inc., and the product grade was industrial grade.
The acrylic impact modifier used in the present example is obtained from Shandong Ruifeng Polymer materials Co., Ltd, and has a molecular weight of 30000-60000 and a pH of 6-8.
The lubricant used in the example is purchased from Guangdong Huanji chemical Co., Ltd, has a softening point of 103-106 ℃ and a density of 0.94-0.96 g/cm3。
The process flow agent used in this example was purchased from new environmental protection materials, inc, and the product grade was industrial grade.
The titanium dioxide used in this example was purchased from the dragon boa herbori ltd, R-type, density 4.26g/cm3, refractive index 2.72.
The surface observation results of the rigid polyvinyl chloride pipe produced in this example are shown in Table 5 below
TABLE 5
| Product name | Whether or not cold spots are generated | Whether black lines are generated | Whether or not to generate bubbles | Whether or not to generate short notes |
| 110 vertical examination | Is provided with | Whether or not | Whether or not | Whether or not |
| 110 straight-through | Is provided with | Whether or not | Whether or not | Whether or not |
| 110x75H model | Is provided with | Whether or not | Whether or not | Whether or not |
| 40X 25 reducing tee | Is provided with | Whether or not | Whether or not | Whether or not |
Example 6
A preparation method of a hard polyvinyl chloride pipe fitting filled with superfine active calcium carbonate comprises the following steps:
(1) weighing: weighing the raw materials for forming the hard polyvinyl chloride pipe fitting according to the ratio, wherein the raw materials for forming the hard polyvinyl chloride pipe fitting are as follows: 300 kg of polyvinyl chloride resin powder, 24 kg of superfine active calcium carbonate, 15.6 kg of calcium zinc stabilizer, 11.1 kg of acrylate impact modifier, 0.75 kg of lubricant, 3.6 kg of processing flowing agent and 10.5 kg of titanium dioxide;
(2) primary heat mixing: putting the raw materials for forming the rigid polyvinyl chloride pipe fitting into mixing equipment for hot mixing, wherein the temperature of primary hot mixing is 118 ℃, the rotating speed is 1400r/min, and the time is 13 min;
(3) secondary thermal mixing: immediately carrying out secondary thermal mixing after the primary thermal mixing is finished, wherein the temperature of the secondary thermal mixing is 120 ℃, the rotating speed is 450r/min, and the time is 3.0min, so as to obtain a thermal mixed material;
(4) cold mixing: putting the hot mixed material into a condition of 58 ℃ for cold mixing, wherein the time of cold mixing is 18min, and obtaining a cold mixed material;
(5) and (3) extruding and granulating: adding the cold mixture into an extruder for granulation to obtain a granular material; the temperatures of the first zone, the second zone and the third zone of the extruder cylinder are 162 ℃, and the temperature of the fourth zone of the extruder cylinder is 158 ℃; the temperature of the die confluence core area is 162 ℃, the temperature of the die orifice area is 162 ℃, and the temperature of the die confluence core area is the same as the temperatures of the first area, the second area, the third area and the die orifice area of the machine barrel;
(6) drying and dehumidifying: drying and dehumidifying the granular material at the temperature of 75 ℃ for 1.8h to obtain dried granular material;
(7) molding: respectively sending the dried granules into an injection molding machine 1 for producing 110 vertical inspection, an injection molding machine 2 for producing 110 straight-through, an injection molding machine 3 for producing 110x75H type and an injection molding machine 4 for producing 40 x 25 reducing tee joint through pipelines, and molding to obtain the ultra-fine activated calcium carbonate filled rigid polyvinyl chloride pipe fittings which are respectively as follows: 110 vertical inspection, 110 straight-through, 110x75H type, 40 x 25 reducing tee.
The mixing equipment used in this example was produced by yili limited, zhang gang city, and the model number was: SRL-Z1000/2500; the extruder used was a model number of a product of Zhang hong bell mechanical limited: BRZ 80/156; the injection molding machine used was a model number of 250T/300T manufactured by Haitian Plastic machine group Co.
The polyvinyl chloride resin powder used in this example was obtained from Yibin Tianyuan group, Ltd., SG-8 type, and had a density of 1.38 to 1.40g/cm3。
The superfine active calcium carbonate used in the example is purchased from Guangxi and American New Material science and technology Limited, the water content is 0.05 percent, and the pH value is 7-8.
The calcium zinc stabilizer used in this example was purchased from Guangdong Xinda New Material science and technology, Inc., and the product grade was industrial grade.
The acrylic impact modifier used in the present example is obtained from Shandong Ruifeng Polymer materials Co., Ltd, and has a molecular weight of 30000-60000 and a pH of 6-8.
The lubricant used in the example is purchased from Guangdong Huanji chemical Co., Ltd, has a softening point of 103-106 ℃ and a density of 0.94-0.96 g/cm3。
The process flow agent used in this example was purchased from new environmental protection materials, inc, and the product grade was industrial grade.
The titanium dioxide used in this example was purchased from the dragon boa herbori ltd, R-type, density 4.26g/cm3, refractive index 2.72.
The surface observation results of the rigid polyvinyl chloride pipe produced in this example are shown in Table 6 below
TABLE 6
| Product name | Whether or not cold spots are generated | Whether black lines are generated | Whether or not to generate bubbles | Whether or not to generate short notes |
| 110 vertical examination | Whether or not | Is provided with | Whether or not | Whether or not |
| 110 straight-through | Whether or not | Is provided with | Whether or not | Whether or not |
| 110x75H model | Whether or not | Is provided with | Whether or not | Whether or not |
| 40X 25 reducing tee | Whether or not | Is provided with | Whether or not | Whether or not |
Example 7
A preparation method of a hard polyvinyl chloride pipe fitting filled with superfine active calcium carbonate comprises the following steps:
(1) weighing: weighing the raw materials for forming the hard polyvinyl chloride pipe fitting according to the ratio, wherein the raw materials for forming the hard polyvinyl chloride pipe fitting are as follows: 300 kg of polyvinyl chloride resin powder, 24 kg of superfine active calcium carbonate, 15.6 kg of calcium zinc stabilizer, 11.1 kg of acrylate impact modifier, 0.75 kg of lubricant, 3.6 kg of processing flowing agent and 10.5 kg of titanium dioxide;
(2) primary heat mixing: putting the raw materials for forming the rigid polyvinyl chloride pipe fitting into mixing equipment for hot mixing, wherein the temperature of primary hot mixing is 118 ℃, the rotating speed is 1400r/min, and the time is 13 min;
(3) secondary thermal mixing: immediately carrying out secondary thermal mixing after the primary thermal mixing is finished, wherein the temperature of the secondary thermal mixing is 120 ℃, the rotating speed is 450r/min, and the time is 3.0min, so as to obtain a thermal mixed material;
(4) cold mixing: putting the hot mixed material into a condition of 58 ℃ for cold mixing, wherein the time of cold mixing is 18min, and obtaining a cold mixed material;
(5) and (3) extruding and granulating: adding the cold mixture into an extruder for granulation to obtain a granular material; the temperatures of the first zone, the second zone and the third zone of the extruder cylinder are 162 ℃, and the temperature of the fourth zone of the extruder cylinder is 158 ℃; the temperature of the die confluence core area is 157 ℃, the temperature of the die opening area is 162 ℃, and the temperature of the die confluence core area is always lower than the temperatures of the first area, the second area, the third area and the die opening area of the machine barrel by 5 ℃;
(6) molding: respectively sending the dried granules into an injection molding machine 1 for producing 110 vertical inspection, an injection molding machine 2 for producing 110 straight-through, an injection molding machine 3 for producing 110x75H type and an injection molding machine 4 for producing 40 x 25 reducing tee joint through pipelines, and molding to obtain the ultra-fine activated calcium carbonate filled rigid polyvinyl chloride pipe fittings which are respectively as follows: 110 vertical inspection, 110 straight-through, 110x75H type, 40 x 25 reducing tee.
The mixing equipment used in this example was produced by yili limited, zhang gang city, and the model number was: SRL-Z1000/2500; the extruder used was a model number of a product of Zhang hong bell mechanical limited: BRZ 80/156; the injection molding machine used was a model number of 250T/300T manufactured by Haitian Plastic machine group Co.
The polyvinyl chloride resin powder used in this example was obtained from Yibin Tianyuan group, Ltd., SG-8 type, and had a density of 1.38 to 1.40g/cm3。
The superfine active calcium carbonate used in the example is purchased from Guangxi and American New Material science and technology Limited, the water content is 0.05 percent, and the pH value is 7-8.
The calcium zinc stabilizer used in this example was purchased from Guangdong Xinda New Material science and technology, Inc., and the product grade was industrial grade.
The acrylic impact modifier used in the present example is obtained from Shandong Ruifeng Polymer materials Co., Ltd, and has a molecular weight of 30000-60000 and a pH of 6-8.
The lubricant used in the example is purchased from Guangdong Huanji chemical Co., Ltd, has a softening point of 103-106 ℃ and a density of 0.94-0.96 g/cm3。
The process flow agent used in this example was purchased from new environmental protection materials, inc, and the product grade was industrial grade.
The titanium dioxide used in this example was purchased from the dragon boa herbori ltd, R-type, density 4.26g/cm3, refractive index 2.72.
The surface observation results of the rigid polyvinyl chloride pipe produced in this example are shown in Table 7 below
TABLE 7
| Product name | Whether or not cold spots are generated | Whether black lines are generated | Whether or not to generate bubbles | Whether or not to generate short notes |
| 110 vertical examination | Whether or not | Whether or not | Is provided with | Whether or not |
| 110 straight-through | Whether or not | Whether or not | Is provided with | Whether or not |
| 110x75H model | Whether or not | Whether or not | Is provided with | Whether or not |
| 40X 25 reducing tee | Whether or not | Whether or not | Is provided with | Whether or not |
Comparative example 1
A preparation method of a hard polyvinyl chloride pipe fitting filled with superfine active calcium carbonate comprises the following steps:
(1) weighing: weighing the raw materials for forming the hard polyvinyl chloride pipe fitting according to the ratio, wherein the raw materials for forming the hard polyvinyl chloride pipe fitting are as follows: 300 kg of polyvinyl chloride resin powder, 24 kg of common light calcium carbonate, 15.6 kg of calcium zinc stabilizer, 11.1 kg of acrylate impact modifier, 0.75 kg of lubricant, 3.6 kg of processing flowing agent and 10.5 kg of titanium dioxide;
(2) primary heat mixing: putting the raw materials for forming the rigid polyvinyl chloride pipe fitting into mixing equipment for hot mixing, wherein the temperature of primary hot mixing is 118 ℃, the rotating speed is 1400r/min, and the time is 13 min;
(3) secondary thermal mixing: immediately carrying out secondary thermal mixing after the primary thermal mixing is finished, wherein the temperature of the secondary thermal mixing is 120 ℃, the rotating speed is 450r/min, and the time is 3.0min, so as to obtain a thermal mixed material;
(4) cold mixing: putting the hot mixed material into a condition of 58 ℃ for cold mixing, wherein the time of cold mixing is 18min, and obtaining a cold mixed material;
(5) and (3) extruding and granulating: adding the cold mixture into an extruder for granulation to obtain a granular material; the temperatures of the first zone, the second zone and the third zone of the extruder cylinder are 162 ℃, and the temperature of the fourth zone of the extruder cylinder is 158 ℃; the temperature of the die confluence core area is 157 ℃, the temperature of the die opening area is 162 ℃, and the temperature of the die confluence core area is always lower than the temperatures of the first area, the second area, the third area and the die opening area of the machine barrel by 5 ℃;
(6) drying and dehumidifying: drying and dehumidifying the granular material at the temperature of 75 ℃ for 1.8h to obtain dried granular material;
(7) molding: respectively sending the dried granules into an injection molding machine 1 for producing 110 vertical inspection, an injection molding machine 2 for producing 110 straight-through, an injection molding machine 3 for producing 110x75H type and an injection molding machine 4 for producing 40 x 25 reducing tee joint through pipelines, and molding to obtain the ultra-fine activated calcium carbonate filled rigid polyvinyl chloride pipe fittings which are respectively as follows: 110 vertical inspection, 110 straight-through, 110x75H type, 40 x 25 reducing tee.
The mixing equipment used in this example was produced by yili limited, zhang gang city, and the model number was: SRL-Z1000/2500; the extruder used was a model number of a product of Zhang hong bell mechanical limited: BRZ 80/156; the injection molding machine used was a model number of 250T/300T manufactured by Haitian Plastic machine group Co.
The polyvinyl chloride resin powder used in this example was obtained from Yibin Tianyuan group, Ltd., SG-8 type, and had a density of 1.38 to 1.40g/cm3。
The superfine active calcium carbonate used in the example is purchased from Guangxi and American New Material science and technology Limited, the water content is 0.05 percent, and the pH value is 7-8.
The calcium zinc stabilizer used in this example was purchased from Guangdong Xinda New Material science and technology, Inc., and the product grade was industrial grade.
The acrylic impact modifier used in the present example is obtained from Shandong Ruifeng Polymer materials Co., Ltd, and has a molecular weight of 30000-60000 and a pH of 6-8.
The lubricant used in the example is purchased from Guangdong Huanji chemical Co., Ltd, has a softening point of 103-106 ℃ and a density of 0.94-0.96 g/cm3。
The process flow agent used in this example was purchased from new environmental protection materials, inc, and the product grade was industrial grade.
The titanium dioxide used in this example was purchased from the dragon boa herbori ltd, R-type, density 4.26g/cm3, refractive index 2.72.
The surface observation results of the rigid polyvinyl chloride pipe produced in this example are shown in Table 8 below
TABLE 8
| Product name | Whether or not cold spots are generated | Whether black lines are generated | Whether or not to generate bubbles | Whether or not to generate short notes |
| 110 vertical examination | Whether or not | Is provided with | Whether or not | Whether or not |
| 110 straight-through | Whether or not | Is provided with | Whether or not | Whether or not |
| 110x75H model | Whether or not | Is provided with | Whether or not | Whether or not |
| 40X 25 reducing tee | Whether or not | Is provided with | Whether or not | Whether or not |
According to the performance measurement results, the preparation method of the hard polyvinyl chloride pipe fitting filled with the ultrafine active calcium carbonate replaces the common light calcium carbonate with the ultrafine active calcium carbonate, and the use amount of other auxiliary agent components is reduced under the condition of keeping the filling part unchanged, so that the product quality is improved, and the formula cost is reduced; according to the method, the mixed material which is well mixed in hot is slowly stirred for several minutes from high speed to low speed in the hot mixing equipment, and then is discharged into the cold mixing equipment for cold mixing, so that static electricity is eliminated, the fluidity of the dry mixed material is improved, and the glossiness of extruded particles can be improved; according to the application, the mixed powder is melted and extruded through an extruder, and is cut into granules and then sent to an injection molding machine for injection molding production, at the moment, after the mixed formula material is subjected to preheating and plasticizing treatment, the molten material is more uniform after one-time plasticizing and melting, so that the product flowability of various hard polyvinyl chloride pipe fitting products is good, the cold spots of the products are reduced, and the product performance is improved; the temperature of the extrusion granulation confluence core area is controlled to be 4-6 ℃ lower than that of the first area, the second area, the third area and the die area of the machine barrel all the time, so that the produced granulated material is more compact, the surface quality of a PVC-U pipe fitting product injected in the later period is high, and the generation of black lines of the product is reduced; drying and dehumidifying step is add to this application, and the drying and dehumidifying step is used for dehumidifying and drying a small amount of moisture in the raw materials, and the surface quality of the hard polyvinyl chloride pipe fitting product of output, especially thick wall product this moment has obvious improvement, and no bubble produces.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. The hard polyvinyl chloride pipe fitting filled with the superfine active calcium carbonate is characterized by comprising the following raw materials in parts by weight: 90-110 parts of polyvinyl chloride resin powder, 7-10 parts of superfine active calcium carbonate, 5-5.5 parts of stabilizer, 3.5-4 parts of impact resistance agent, 0.2-0.3 part of lubricant, 1-1.5 parts of processing flowing agent and 3-4 parts of titanium dioxide.
2. The ultra-fine activated calcium carbonate filled rigid polyvinyl chloride pipe fitting as claimed in claim 1, wherein the ultra-fine activated calcium carbonate filled rigid polyvinyl chloride pipe fitting is composed of the following raw materials by weight: 100 parts of polyvinyl chloride resin powder, 8 parts of superfine active calcium carbonate, 5.2 parts of stabilizer, 3.7 parts of impact resistance agent, 0.25 part of lubricant, 1.2 parts of processing flowing agent and 3.5 parts of titanium dioxide.
3. The pipe fitting of claim 1, wherein the stabilizer is calcium zinc stabilizer.
4. The ultra-fine activated calcium carbonate filled rigid polyvinyl chloride pipe fitting as claimed in claim 1, wherein said impact resistant agent is an acrylate impact resistant agent.
5. A method for preparing a rigid polyvinyl chloride pipe fitting filled with the ultrafine active calcium carbonate according to any one of claims 1 to 4, comprising the following steps:
(1) weighing: weighing raw materials for forming the rigid polyvinyl chloride pipe fitting according to the proportion;
(2) primary heat mixing: putting the raw materials for forming the rigid polyvinyl chloride pipe fitting into mixing equipment for hot mixing, wherein the temperature of primary hot mixing is 115-120 ℃, the rotating speed is 1350-1450 r/min, and the time is 10-15 min;
(3) secondary thermal mixing: immediately carrying out secondary thermal mixing after the primary thermal mixing is finished, wherein the temperature of the secondary thermal mixing is 117-122 ℃, the rotating speed is 400-500 r/min, and the time is 2.5-3.5 min, so as to obtain a thermal mixed material;
(4) cold mixing: putting the hot mixed material into a cold mixer at the temperature of 55-60 ℃, and performing cold mixing for 15-20 min to obtain a cold mixed material;
(5) and (3) extruding and granulating: adding the cold mixture into an extruder for granulation to obtain a granular material; the temperature of a machine barrel of the extruder is 155-165 ℃; the temperature of the die confluence core area is 155-160 ℃, the temperature of the die opening area is 160-165 ℃, and the temperature of the die confluence core area is always 4-6 ℃ lower than that of the first area, the second area, the third area and the die opening area of the machine barrel;
(6) drying and dehumidifying: drying and dehumidifying the granular material for 1.5-2 h at the temperature of 70-80 ℃ to obtain dried granular material;
(7) molding: and (3) feeding the dried granules into an injection molding machine, and molding to obtain the hard polyvinyl chloride pipe fitting filled with the superfine activated calcium carbonate.
6. The method for preparing a hard polyvinyl chloride pipe fitting filled with ultrafine active calcium carbonate according to claim 5, wherein the raw materials for preparing the hard polyvinyl chloride pipe fitting in the step (2) are put into a mixing device for hot mixing, and the temperature of the first hot mixing is 118 ℃, the rotating speed is 1400r/min, and the time is 13 min.
7. The method for preparing a rigid PVC pipe fitting filled with ultrafine activated calcium carbonate according to claim 5, wherein the step (3) is carried out by performing secondary thermal mixing immediately after the primary thermal mixing is finished, wherein the temperature of the secondary thermal mixing is 120 ℃, the rotation speed is 450r/min, and the time is 3.0min, so as to obtain the hot mixed material.
8. The method for preparing the hard polyvinyl chloride pipe fitting filled with the ultrafine active calcium carbonate according to claim 5, wherein in the step (4), the hot mixed material is placed at a temperature of 58 ℃ for cold mixing, and the cold mixing time is 18min, so that a cold mixed material is obtained.
9. The method for preparing a rigid PVC pipe filled with ultrafine activated calcium carbonate according to claim 5, wherein in step (5), the temperatures of the first zone, the second zone and the third zone of the extruder cylinder are 162 ℃, the temperature of the fourth zone of the extruder cylinder is 158 ℃, the temperature of the die confluence zone is 157 ℃ and the temperature of the die orifice zone is 162 ℃.
10. The method for preparing a hard polyvinyl chloride pipe fitting filled with ultrafine active calcium carbonate according to claim 5, wherein in the step (6), the granules are placed at a temperature of 75 ℃ for drying and dehumidifying for 1.8h to obtain dried granules.
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| CN115850882A (en) * | 2022-11-17 | 2023-03-28 | 邓权塑业科技（湖南）有限公司 | High-calcium PVC (polyvinyl chloride) pipe and production process |
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