CN114196070B - Method for manufacturing PVC hollow profile with composite nano material and knurled surface - Google Patents
Method for manufacturing PVC hollow profile with composite nano material and knurled surface Download PDFInfo
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- CN114196070B CN114196070B CN202111480342.4A CN202111480342A CN114196070B CN 114196070 B CN114196070 B CN 114196070B CN 202111480342 A CN202111480342 A CN 202111480342A CN 114196070 B CN114196070 B CN 114196070B
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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
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
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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
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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
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
- C08K7/26—Silicon- containing compounds
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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
- C08K9/00—Use of pretreated ingredients
- C08K9/08—Ingredients agglomerated by treatment with a binding agent
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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
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/222—Magnesia, i.e. magnesium oxide
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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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- Health & Medical Sciences (AREA)
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- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a composite nano material and a method for manufacturing a PVC hollow section bar with knurled surface, wherein the composite nano material comprises nano SiO 2 MgO and SiO 2 Treating agent, siO 2 The treating agent is a mixture of gasified Fischer-Tropsch wax, stearic acid and epoxidized soybean oil. The manufacturing method comprises the process of manufacturing the PVC mixed material, the process of extrusion molding the PVC mixed material and the process of cooling and shaping the PVC hollow profile, wherein the process of manufacturing the PVC mixed material is as follows: the composite nano material is added into PVC mixture, and the PVC mixture is prepared by high and low stirring. The special composite nano material is added into the PVC mixture to manufacture the PVC hollow profile, so that the cooling shrinkage rate of the connecting ribs inside the hollow profile in the cooling shaping process after the connecting ribs are arranged at the die opening of the profile die can be reduced, and the quality of the profile is improved.
Description
Technical Field
The invention belongs to the technical field of PVC profile production, and particularly relates to a composite nanomaterial and a method for manufacturing a PVC hollow profile with knurled surface.
Background
The manufacturing process of the PVC hollow profile comprises three stages:
(1) Plasticizing the raw materials, namely heating and mixing by an extruder to change the solid raw materials into uniform viscous fluid;
(2) Molding, namely, continuously passing the melted material through a molding machine head at a certain pressure and speed under the action of an extrusion part of an extruder, so as to obtain a certain section shape;
(3) Cooling and shaping, namely fixing the obtained shape of the melted material by a shaping die and a cooling treatment method, and changing the melted material into a solid state.
In the cooling and shaping process, the existing cooling and shaping process mostly adsorbs hot blanks just coming out of a shaping machine head through vacuum negative pressure in a shaping die to cool and shape the hollow section bar, and certain cooling shrinkage phenomenon can occur in the cooling and shaping process after connecting ribs in the hollow section bar are positioned at the die opening of the section bar die, thereby affecting the shaping of patterns on the surface of the section bar and even affecting the appearance quality and shape of the section bar. This problem is to be solved.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a composite nano material and a method for manufacturing a PVC hollow profile with knurled surface, wherein the composite nano material can be applied to the PVC hollow profile with knurled surface and is used for reducing the cooling shrinkage rate of an internal connecting rib of the PVC hollow profile in the cooling shaping process after a profile die is opened; the PVC hollow profile manufactured by the manufacturing method can reduce the cooling shrinkage phenomenon of the internal connecting ribs in the cooling shaping process, and improve the quality of the profile.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a composite nano material, which comprises nano SiO 2 MgO and SiO 2 Treating agent of SiO 2 The treating agent is a mixture of gasified Fischer-Tropsch wax, stearic acid and epoxidized soybean oil.
In the above technical solution, the SiO 2 The treatment agent comprises 45-50% of Fischer-Tropsch wax, 35-40% of stearic acid and 15-20% of epoxidized soybean oil.
In the above technical solution, the nano SiO 2 MgO and SiO 2 The mass percentage of the treating agent is (6-8): (88-92): (2-3).
In the above technical solution, the nano SiO 2 MgO and SiO 2 The mass percentage of the treating agent is 7:90:3.
the invention provides a preparation method of a composite nano material, which comprises the following steps:
step 1, the nano SiO is arranged in a certain container by a fan 2 Floating dust treatment is carried out on MgO;
step 2, mixing the Fischer-Tropsch wax, stearic acid and epoxidized soybean oil according to a certain proportion, heating and pressurizing, and making them pass through a high-pressure metering pump and a spray head so as to makeThe SiO is obtained by gas atomization 2 A treating agent;
step 3, fully mixing the components under the action of a fan;
and step 4, collecting dust falling matters to obtain the composite nano material.
The application of the composite nano material is that the composite nano material is applied to the PVC hollow section with knurled surface and is used for reducing the cooling shrinkage rate of the internal connecting rib of the PVC hollow section in the cooling shaping process after the section die is taken out.
The invention provides a method for manufacturing a PVC hollow section with knurled surface, which comprises the process of manufacturing PVC mixed materials, the process of extrusion molding the PVC mixed materials and the process of cooling and shaping the PVC hollow section,
the PVC mixed material is prepared by the following steps: adding the composite nano material or the composite nano material prepared by the preparation method into a PVC mixture, and stirring the mixture into the PVC mixture by high and low stirring.
In the technical scheme, the addition amount of the composite nano material is 2-3% of the mass of the PVC mixture.
In the technical scheme, the extrusion molding process of the PVC mixed material comprises the following steps: the PVC mixed material is put into a PVC extruder, passes through a PVC profile die arranged at the rear end of the PVC extruder, and then passes through a second die arranged at the rear end of the PVC profile die, and is extruded and molded from an outlet of a first die arranged at the rear end of the second die;
the connecting rib flow channel of the second die is increased by 4% -5% in the height direction compared with the connecting rib flow channel of the first die, so that the plasticized PVC mixed material entering the connecting rib flow channel of the first die is increased by 4% -5% in the height direction, and cooling shrinkage of the plasticized PVC mixed material in the cooling shaping process after the plasticized PVC mixed material exits the first die is compensated.
In the above technical scheme, the PVC hollow profile with knurled surface comprises a knurled layer, and the cooling and shaping process of the PVC hollow profile is as follows: the PVC hollow section after extrusion molding enters a shaping die, a shaping die inlet section of the shaping die evenly sprays a certain amount of cooling water for quenching the surface pattern knurled on the surface of the section so as to ensure that the pattern is shaped quickly and is not deformed, and the spraying amount of the water is regulated by a water valve so that the sprayed water does not overflow the inlet of the shaping die.
The invention has the beneficial effects that:
1. the special composite nano material is added into the PVC mixture, and the PVC hollow profile with the knurled surface is manufactured through the extruder and the profile die, so that the cooling shrinkage rate of the connecting ribs inside the PVC hollow profile in the cooling and shaping process after the connecting ribs are arranged at the die opening of the profile die can be reduced.
2. When the manufacturing method of the PVC hollow section is used for designing the processing mould, the connecting rib runner of the second die is increased by 4% -5% in the height direction compared with the connecting rib runner of the first die, so that the expansion pressure of PVC mixed materials entering the connecting rib runner of the first die is increased by 4% -5% in the height direction, and the cooling shrinkage of the PVC mixed materials in the cooling shaping process after exiting the first die is compensated.
3. According to the manufacturing method of the PVC hollow section, a certain amount of cooling water is uniformly sprayed on the surface pattern after the surface of the section is knurled at the inlet section of the shaping die for quenching, so that the pattern can be rapidly shaped and is not deformed.
Drawings
FIG. 1 is a block diagram of a PVC hollow profile manufacturing process;
FIG. 2 is a cross-sectional view of a knurled portion of a PVC hollow profile die;
wherein: 1. a PVC extruder; 2. PVC section bar mould; 3. a second die; 4. a first die; 5. forming die; 6. a cooling system; 7. an inlet section of the shaping die; 8. a knurled layer; 9. a connecting rib; 10. knurling wheel.
Detailed Description
The invention will be further described with reference to specific examples for better illustrating the objects, technical solutions and advantages of the invention. This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art, and the present invention will only be defined by the appended claims.
SiO 2 In PVC processing, the viscosity is extremely high, the friction is large, the use is usually avoided as much as possible, but SiO 2 The wear resistance is strong, and the release agent is a good release agent for most film products. While nano SiO 2 After surface treatment, the PVC plastic film can be changed into a favorable one, the shrinkage rate of PVC products can be reduced, the shrinkage marks are reduced, the surface quality is improved, and the hardness and the surface strength of the products are improved. MgO is used for PVC processing, so that the zinc burning phenomenon of the Ca-Zn stabilizer can be reduced, and meanwhile, the MgO has an infrared reflection function, and the deformation resistance of the product can be improved in different use environments.
Based on the principle, the invention provides a composite nano material which comprises nano SiO 2 MgO and SiO 2 And (3) a treating agent.
Nano SiO 2 MgO and SiO 2 The mass percentage of the treating agent is (6-8): (88-92): (2-3), preferably 7:90:3.
SiO 2 the treating agent is a mixture of gasified Fischer-Tropsch wax, gasified stearic acid and gasified epoxidized soybean oil. SiO (SiO) 2 The mass percentage of the gasified Fischer-Tropsch wax in the treating agent is 45-50%, the mass percentage of the gasified stearic acid is 35-40%, and the mass percentage of the gasified epoxidized soybean oil is 15-20%. Different proportions may be selected depending on the application.
As one example, siO 2 The mass percentage of the Fischer-Tropsch wax in the treating agent is 45%, the mass percentage of the stearic acid is 35%, and the mass percentage of the epoxidized soybean oil is 20%.
As one example, siO 2 The mass percentage of the Fischer-Tropsch wax in the treating agent is 45%, the mass percentage of the stearic acid is 40%, and the mass percentage of the epoxidized soybean oil is 15%.
As one example, siO 2 The mass percentage of the Fischer-Tropsch wax in the treating agent is 47%, the mass percentage of the stearic acid is 37%, and the mass percentage of the epoxidized soybean oil is 16%.
As one example, siO 2 The mass percentage of the Fischer-Tropsch wax in the treating agent is 48%, the mass percentage of the stearic acid is 35%, and the mass percentage of the epoxidized soybean oil is 17%.
As one example, siO 2 The mass percentage of the Fischer-Tropsch wax in the treating agent is 50%, the mass percentage of the stearic acid is 35%, and the mass percentage of the epoxidized soybean oil is 15%. The invention provides a preparation method of a composite nano material, which comprises the following steps:
step 1, nanometer SiO is carried out in a certain container by a fan 2 Floating dust treatment is carried out on MgO;
step 2, mixing Fischer-Tropsch wax, stearic acid and epoxidized soybean oil according to a certain proportion (such as the above proportion), heating and pressurizing, and making it be aerosolized by means of high-pressure metering pump and spray head so as to obtain the invented SiO 2 A treating agent;
step 3, the components (nano SiO obtained in step 1) are processed by a fan 2 And MgO and SiO obtained in step 2 2 Treating agent) is fully mixed;
and step 4, collecting dust falling matters to obtain the composite nano material.
The composite nano material can be applied to PVC hollow profiles with knurled surfaces and is used for reducing the cooling shrinkage rate of internal connecting ribs of the PVC hollow profiles in the cooling and shaping process after the profile die is opened.
The invention provides a method for manufacturing a PVC hollow profile with knurled surface, which comprises the process of manufacturing a PVC mixed material, the process of extrusion molding the PVC mixed material and the process of cooling and shaping the PVC hollow profile.
The PVC mixed material is prepared by the following steps: adding the composite nano material or the composite nano material prepared by the preparation method into a PVC mixture, and stirring the mixture into a PVC mixture by high and low stirring.
The flow chart of the manufacturing method is shown in fig. 1, the PVC mixed material enters a PVC extruder 1 and then passes through a PVC profile die 2, a second die 3 and a first die 4 respectively, so that the extrusion molding process is completed, a knurling wheel 10 carries out knurling treatment on the PVC mixed material, then the PVC mixed material enters a shaping die 5, the cooling shaping process is completed, and a cooling system 6 carries out further cooling treatment on the hollow profile cooled by the shaping die 5.
In the technical scheme, the addition amount of the composite nano material is 2-3% of the mass of the PVC mixture.
The PVC mixture adopts a conventional formula in the prior art, the formula of the PVC mixture mainly comprises PVC resin and an auxiliary agent, and the auxiliary agent comprises: heat stabilizers, lubricants, processing modifiers, impact modifiers, fillers, anti-aging agents, colorants, and the like.
The extrusion molding process of the PVC mixture comprises the following steps: PVC mixed materials are put into a PVC extruder 1, pass through a PVC profile die 2 arranged at the rear end of the PVC extruder 1, pass through a second die 3 arranged at the rear end of the PVC profile die 2, and are extruded and molded from an outlet of a first die 4 arranged at the rear end of the second die 3. Preferably, the second die 3 has a length of 30-40mm and the first die 4 has a length of 30mm.
The connecting rib flow channel of the second die 3 is increased by 4% -5% in the height direction compared with the connecting rib flow channel of the first die 4, so that the plasticized PVC mixed material entering the connecting rib flow channel of the first die 4 is increased by 4% -5% in the height direction, and the cooling shrinkage of the plasticized PVC mixed material in the cooling shaping process after the PVC mixed material exits the first die 4 is compensated.
The sectional view of the knurled part of the die of the PVC hollow section is shown in fig. 2, and fig. 2 is the sectional view of the knurled part of the PVC hollow section. The uppermost surface of the section bar is provided with a knurling layer 8, and the hollow part is provided with a connecting rib 9.
In the above technical scheme, the PVC hollow profile with knurled surface comprises a knurled layer 8, and the cooling and shaping process of the PVC hollow profile is as follows: the PVC hollow section after extrusion molding enters the shaping mold 5, and a certain amount of cooling water is uniformly sprayed on the surface pattern knurled on the surface of the section at the inlet section 7 of the shaping mold for quenching so as to ensure that the pattern is shaped quickly and does not deform, and the sprayed water is sprayed on the inlet of the shaping mold 5. The cooling water is cooled by the refrigerator, and the size of the cooling water can be adjusted by the water valve. Preferably, the inlet section 7 of the shaping die is a 25-30mm part of the front end of the shaping die 5, namely a water spraying quenching part.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (5)
1. The method for manufacturing the PVC hollow profile with the knurled surface comprises a PVC mixed material manufacturing process, a PVC mixed material extrusion molding process and a PVC hollow profile cooling and shaping process, and is characterized in that:
the PVC mixed material is prepared by the following steps: adding the composite nano material into a PVC mixture, and stirring the mixture into the PVC mixture by high and low stirring;
wherein the composite nanomaterial comprises nano SiO 2 MgO and SiO 2 Treating agent of SiO 2 The treating agent is a mixture of gasified Fischer-Tropsch wax, stearic acid and epoxidized soybean oil, and the SiO is 2 45-50% of Fischer-Tropsch wax, 35-40% of stearic acid and 15-20% of epoxidized soybean oil in the treating agent, wherein the nano SiO is prepared from the following components in percentage by mass 2 MgO and SiO 2 The mass percentage of the treating agent is (6-8): (88-92): (2-3), wherein the addition amount of the composite nano material is 2-3% of the mass of the PVC mixture;
the extrusion molding process of the PVC mixture comprises the following steps: the PVC mixed material is put into a PVC extruder (1), passes through a PVC profile die (2) arranged at the rear end of the PVC extruder (1), and then passes through a second die (3) arranged at the rear end of the PVC profile die (2), and is extruded and molded from an outlet of a first die (4) arranged at the rear end of the second die (3);
the connecting rib flow channel of the second die (3) is increased by 4% -5% in the height direction compared with the connecting rib flow channel of the first die (4), so that the plasticized PVC mixed material entering the connecting rib flow channel of the first die (4) is increased by 4% -5% in the height direction, and the cooling shrinkage of the plasticized PVC mixed material in the cooling shaping process after exiting the first die (4) is compensated.
2. The method of manufacturing according to claim 1, wherein: the nano SiO 2 MgO and SiO 2 The mass percentage of the treating agent is 7:90:3.
3. the method of manufacturing according to claim 1, wherein: the preparation method of the composite nano material comprises the following steps:
step 1, the nano SiO is arranged in a certain container by a fan 2 Floating dust treatment is carried out on MgO;
step 2, mixing the Fischer-Tropsch wax, stearic acid and epoxidized soybean oil according to a certain proportion, heating and pressurizing, and enabling the mixture to be atomized through a high-pressure metering pump and a spray head to obtain the SiO 2 A treating agent;
step 3, fully mixing the components under the action of a fan;
and step 4, collecting dust falling matters to obtain the composite nano material.
4. The method of manufacturing according to claim 1, wherein: the composite nano material is applied to the PVC hollow section with knurled surface and is used for reducing the cooling shrinkage rate of the internal connecting ribs of the PVC hollow section in the cooling shaping process after the die of the profile die.
5. The method of manufacturing according to claim 1, wherein: the PVC hollow profile with knurled surface comprises a knurled layer, and the cooling and shaping process of the PVC hollow profile comprises the following steps: the PVC hollow profile after extrusion molding enters a shaping mold (5), a certain amount of cooling water is uniformly sprayed on the surface pattern after knurling on the surface of the profile by a shaping mold inlet section (7) of the shaping mold (5) for quenching so as to ensure that the pattern is shaped quickly and is not deformed, the spraying amount of the water is regulated by a water valve, and the sprayed water does not overflow the inlet of the shaping mold (5).
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