CN113930030A - Warm frame section bar for shutter and manufacturing method thereof - Google Patents
Warm frame section bar for shutter and manufacturing method thereof Download PDFInfo
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- CN113930030A CN113930030A CN202111284841.6A CN202111284841A CN113930030A CN 113930030 A CN113930030 A CN 113930030A CN 202111284841 A CN202111284841 A CN 202111284841A CN 113930030 A CN113930030 A CN 113930030A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/10—Conditioning or physical treatment of the material to be shaped by grinding, e.g. by triturating; by sieving; by filtering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
Abstract
The invention provides a warm frame section bar for a shutter and a manufacturing method thereof. The formula comprises the following raw materials in parts by weight: 100 parts of PVC resin, 25-32 parts of superfine light activated calcium, 5.1-6.2 parts of calcium-zinc stabilizer, 1.5-2.4 parts of polyethylene wax, 0.9-1.5 parts of stearic acid, 2-4 parts of ACR (polyacrylate), 11-14 parts of CPE (chlorinated polyethylene), 2-4 parts of MBS impact modifier, 4-7 parts of titanium dioxide, 0.3-0.6 part of ultraviolet absorbent, 0.2-0.8 part of silane coupling agent, 0.1-0.3 part of ultramarine and 0.1-0.19 part of antioxidant. The manufacturing method of mixing and screening, granulating first, then extruding, vacuum-assisted shaping and balancing post-treatment is adopted, so that the requirements on extrusion equipment are reduced, and the method can be suitable for different extrusion equipment of various manufacturers. The raw material formula provided by the invention is stable, the material mixing procedure is strict, the technological parameters such as extrusion and the like are reasonable, the obtained warm frame section for the louver window is smooth and glossy in appearance, good in straightness and excellent in performance, and the obvious color change phenomenon and the reduction of mechanical properties can not occur even after the warm frame section is used for a long time.
Description
Technical Field
The invention belongs to the field of PVC (polyvinyl chloride) profile manufacturing, and particularly relates to a warm frame profile for a shutter and a manufacturing method thereof.
Background
The warm frame section bar taking PVC (polyvinyl chloride resin) as a raw material has the advantages of attractive appearance, environmental protection, energy conservation, heat insulation, sound insulation, good air tightness, moisture resistance, corrosion resistance, weather resistance, high quality, low price and the like, and is widely applied to the field of building doors and windows.
The PVC warm frame section products produced in the current market have uneven quality, mainly because the manufacture of the PVC warm frame section products belongs to the fine production of integrating raw materials, equipment and processes, the requirements on the design of a formula, the equipment performance and the process indexes are high, and various working procedures and index parameters influence the final product performance.
In the formula components and formula ratio, the selection and optimized combination of raw materials are directly related to the stable production and quality of the section bar. For example: proper addition of modifiers such as CPE and the like can improve the impact resistance and drop hammer impact strength of products, the addition is too little, the lifting amplitude is not large, and the tensile strength and the bending strength are reduced if the addition is excessive; the filler is added to increase the stability and mechanical property, reduce the cost, but reduce various mechanical strengths too much, the external lubricant can reduce the adhesion of the raw materials to the surface of the die, so that the die has good demoulding property, the internal lubricant can reduce the internal friction among the materials, prevent overheating, and generate adhesion coking when the adding amount is too small, so that the appearance gloss is influenced too much, and the mechanical property of the product is also reduced; the selection of the type and the components of the stabilizer can affect the thermal stability of the product in the early stage, the middle stage and the later stage and the weather resistance of the product in long-term use, and the plasticizing degree and the plasticizing uniformity of the raw material melt can be obviously affected by adding excessive stabilizer.
In the manufacturing process, the quality of the final product is affected by the preparation process, the feeding sequence, the feeding temperature opportunity during mixing and the extrusion parameters during extrusion. For example: when mixing materials, the dispersibility, uniformity and preplasticizing degree of the dry mixed materials directly influence the subsequent extrusion speed and extrusion effect; the feeding sequence and the feeding and mixing time are key for ensuring the quality of the dry mixture, for example, the stabilizer is preferably added at the early stage of the temperature, which is beneficial to the gelation and homogenization of the PVC mixture, the CPE is easy to adsorb the stabilizer, and the CPE is not suitable to be added with the stabilizer at the same time, and the like. During extrusion, the tensile strength is influenced by the rotation number of the screw, the tensile strength is reduced when the rotation number of the screw is too large or too low, the traction speed and the cooling speed are adjusted when the rotation speed of the screw is adjusted, and otherwise the screw is easy to deform and bend; when the extrusion temperature is too high, bubbles exist in the section bar, and the temperature is too low, the surface of a finished product is rough and poor; during vacuum cooling, the vacuum degree influences the forming effect, and the cooling water temperature is too low to enhance brittleness and too high to deform.
Disclosure of Invention
Based on the situation, the invention provides the warm frame section for the shutter and the manufacturing method thereof on the basis of the principle that the raw material formula is stable, the material mixing procedure is strict, and the technological parameters such as extrusion are reasonable. The warm frame section for the shutter comprises the following raw materials in parts by weight: 100 parts of PVC resin, 25-32 parts of superfine light activated calcium, 5.1-6.2 parts of calcium-zinc stabilizer, 1.5-2.4 parts of polyethylene wax, 0.9-1.5 parts of stearic acid, 2-4 parts of ACR (polyacrylate), 11-14 parts of CPE (chlorinated polyethylene), 2-4 parts of MBS impact modifier, 4-7 parts of titanium dioxide, 0.3-0.6 part of ultraviolet absorbent, 0.2-0.8 part of silane coupling agent, 0.1-0.3 part of ultramarine and 0.1-0.19 part of antioxidant.
Preferably, the PVC resin is SG-5 type, the chlorine content of the CPE is 34-37%, the titanium dioxide is rutile type, and the ultramarine is acid-resistant ultramarine.
The optimal raw material components and formula ratio are as follows: 100 parts of SG-5 type PVC resin, 30 parts of superfine light activated calcium, 5.5 parts of calcium-zinc stabilizer, 2 parts of polyethylene wax, 1.2 parts of stearic acid, 3 parts of ACR-201, 12 parts of CPE with the chlorine content of 36 percent, 2.5 parts of MBS impact modifier, 6 parts of rutile type titanium dioxide, 0.5 part of UV329 type ultraviolet absorbent, 0.4 part of silane coupling agent, 0.2 part of acid-resistant ultramarine blue and 0.15 part of antioxidant.
A manufacturing method of a warm frame section for a shutter comprises the following steps:
s1, mixing materials: adding a PVC resin raw material into a high-temperature mixing bin of a high-speed hot mixer as a base material, starting high-speed mixing and stirring, adding a calcium-zinc stabilizer and an active calcium filler when the temperature of the material is rapidly increased to 55-60 ℃ due to heat generation by friction, sequentially adding an internal stearic acid lubricant, a silane coupling agent, CPE and an MBS modifier when the temperature is 80-90 ℃, adding other additives including an ultraviolet absorbent, titanium dioxide, ultramarine and an antioxidant when the temperature is increased to 105-115 ℃, and stirring, mixing and stirring for 5-10 min; reduce the stirring speed of high-speed hot blender, open the pneumatic valve of high temperature blending bunker, slowly blow the material in the high temperature blending bunker to the low temperature blending bunker of low-speed cold blender in, cool off the mixing stirring, add ACR and outer lubricant low molecular weight polyethylene in proper order, treat that low temperature compounding bunker when material cooling to 30-43 ℃, open the pneumatic valve of low temperature blending bunker and unload, obtain the dry blend.
S2, screening and granulating: s1, screening the dry mixture by a screening machine, and screening to remove hard blocks and large-size particles in the dry mixture to obtain the dry mixture with qualified quality; the granulator 165 preheats for 1-2h at 175 ℃, and then dry mixture with qualified quality is sent to the granulator for granulation, so that material particles with good plasticity are obtained, and then the material particles are sent to the extrusion process for feeding.
S3, extrusion molding: s2 feeding the pellets in an extruder, melting and plasticizing the pellets in the extruder, and extruding the pellets through a die head, wherein the barrel temperature of the extruder is 160-165 ℃, the screw temperature is 130-135 ℃, the revolution of a main screw is 22-27r/min, the die head temperature is 190-195 ℃, the extrusion speed is 1.72-2.14m/min, and the traction speed is 1.84-2.47 m/min.
S4, cooling and shaping: after the section die head is extruded, the section enters a vacuum shaping die for primary cooling, the vacuum is pumped, the vacuum degree is 54-61KPa, the section is enabled to be tightly attached to the inner wall of the die for shaping, then the section is sent into a water tank for further cooling, and the cooling water temperature in the water tank is 15-18 ℃.
S5, post-processing: after cooling, shaping and cutting, gradually releasing stress after the section is stacked in a storehouse for 1-3 weeks, and further eliminating shrinkage and bending, wherein the temperature of the storehouse is 20-27 ℃, and the relative humidity is 45-55% RH.
Preferably, the rotation speed of the high-speed hot mixer during high-speed mixing and stirring is 1000-1300r/min, the rotation speed of the low-speed cold mixer during low-speed mixing and stirring is 300-400r/min, and the low-temperature mixing bin is cooled by circulating cooling water, wherein the temperature of the cooling water is 5-10 ℃.
Preferably, the screening machine screens in a vibration mode.
Preferably, the cooling mode of the vacuum shaping mold is wet spraying: the water is sprayed and cooled in a mist mode, and the water temperature is 20-25 ℃.
The invention has the beneficial effects that:
1. the formula provided by the invention adopts the non-toxic and chemically stable ultrafine light activated calcium as the filler, so that the mechanical property of the product can be effectively improved compared with the common calcium carbonate and other fillers, the thermal expansion deformation of the product is reduced, the ACR, CPE and MBS are cooperatively modified, the impact strength of the product is improved, the toughness is increased, the calcium-zinc composite heat stabilizer is more environment-friendly than a common lead salt stabilizer, the product is not easy to discolor after long-term use, the preferred acid-resistant ultramarine has better coloring capability compared with the common ultramarine, the rutile titanium dioxide has obvious color effect after a small amount of use, the rutile titanium dioxide has better weather resistance compared with anatase titanium dioxide, and the volatilization of various substances during the material mixing and kneading can be prevented by adding a small amount of silane coupling agent. Meanwhile, the formula ratio is optimized, so that the product section has smooth and glossy appearance and does not have obvious color change after long-term use.
2. The invention adopts the manufacturing technology of mixing and screening, granulating first, then extruding and vacuum-assisted shaping, reduces the requirement on extrusion equipment, and can be suitable for different extrusion equipment of various manufacturers. Through strict compounding process, according to the change of temperature in the blending bunker and the influence factor of each other between each material promptly, accurate orderly batch adds the raw materials auxiliary agent of each weight fraction under the different temperatures, preferred vibrating screening machine can be with hard piece and jumbo size granule screening out in the dry mixture, avoid hard piece to cause the damage to extrusion equipment and avoid the large granule to influence the extrusion effect of extruding the section bar, the aggregate through the granulation process, have better plastify, plastify the effect better, extrusion process has optimized each item temperature and speed parameter, including preferred wet-type vacuum assistance is stereotyped, can guarantee warm frame section bar's shaping and cooling effect, can avoid various crooked warpage, the stability of quality has been guaranteed when making the goods section bar have excellent performance.
Detailed Description
Example 1
In this example, the ingredients and the ratios of the ingredients are shown in Table 1. The PVC mixing machine set used in the manufacturing process is common equipment and comprises a high-speed mixing machine, a low-speed mixing machine and a high-low-temperature mixing bin, wherein the high-temperature mixing bin can be charged with 150kg, the low-temperature mixing bin can be charged with 350kg, and a pneumatic lifting bin cover and a pneumatic valve are adopted, so that the charging and discharging are facilitated. Hard blocks and large-size particles in the mixed material are screened and removed by a vibrating screen classifier, and the screened substances can damage equipment. The granulator used performs granulation in the form of extrusion and rotary knife cutting. The single screw extruder and the double screw extruder of the embodiment are both applicable, and the double screw extruder is adopted for the best implementation effect.
The method comprises the following specific steps:
s1 mixing: adding a PVC resin raw material into a high-temperature mixing bin of a high-speed hot mixer as a base material, starting high-speed mixing and stirring at the stirring speed of 1200r/min, adding a calcium-zinc stabilizer and an active calcium filler when the temperature of the material rapidly rises to 57 ℃ due to heat generation caused by friction, sequentially adding an internal stearic acid lubricant, a silane coupling agent, CPE and an MBS modifier at 85 ℃, adding other additives including an ultraviolet absorbent, titanium dioxide, ultramarine and an antioxidant when the temperature rises to 110 ℃, and stirring, mixing and stirring for 8 min; reduce the stirring speed of high-speed hot mixer, open the pneumatic valve of high temperature blending bunker, slowly blow the material in the high temperature blending bunker to the low temperature blending bunker of low-speed cold mixer in, the low temperature blending bunker cools off through recirculated cooling water, cooling water temperature is 7 ℃, add ACR and outer lubricant low molecular weight polyethylene again in proper order, when cooling mixing stirring, the stirring rotational speed is 350 rpm, treat that material cooling to when 35 ℃ in the low temperature blending bunker, open the pneumatic valve of low temperature blending bunker and unload, obtain the dry blend.
S2 screening and granulating: s1, screening the dry mixture by a screening machine, wherein the screening machine screens and removes hard blocks and large-size particles in the dry mixture in a vibration mode to obtain the dry mixture with qualified quality; the granulator is preheated for 1.5 hours at 170 ℃, and then the dry mixture with qualified quality is sent to the granulator for granulation, so that material particles with good plasticizing performance are obtained, and then the material particles are sent to the extrusion process for feeding.
S3 extrusion molding: s2 feeding the pellets in an extruder, melting and plasticizing the pellets in the extruder, and extruding the pellets through a die head, wherein the barrel temperature of the extruder is 163 ℃, the screw temperature is 133 ℃, the revolution of a main screw is 25r/min, the die head temperature is 192 ℃, the extrusion speed is 1.85m/min, and the traction speed is 2.02 m/min.
S4 cooling and shaping: after the profile die head is extruded, the profile enters a vacuum setting die for preliminary cooling, the vacuum degree is 58KPa, the profile is tightly adhered to the inner wall of the die for shaping, the vacuum setting die adopts wet spraying in a cooling mode, water is sprayed and cooled in a vaporific mode, and the water temperature is 23 ℃. And (4) after the wet vacuum auxiliary shaping, sending the shaped product into a water tank for further cooling, wherein the temperature of cooling water in the water tank is 16 ℃.
And S5 post-processing: after cooling, shaping and cutting, the section is stacked in a storehouse for 2 weeks, and the stress is gradually released to further eliminate shrinkage and bending, wherein the temperature of the storehouse is 24 ℃, and the relative humidity is 50% RH.
Example 2
In this example, the raw material components and the ratios of the components are shown in table 1, and a single screw extruder is used in the manufacturing process, which is different from comparative example 1 in the process parameters, and the manufacturing method is as follows:
s1 mixing: adding a PVC resin raw material into a high-temperature mixing bin of a high-speed hot mixer as a base material, starting high-speed mixing and stirring at the stirring speed of 1000r/min, adding a calcium-zinc stabilizer and an active calcium filler when the temperature of the material rapidly rises to 60 ℃ due to heat generation caused by friction, sequentially adding an internal stearic acid lubricant, a silane coupling agent, CPE and an MBS modifier at 90 ℃, adding other additives including an ultraviolet absorbent, titanium dioxide, ultramarine and an antioxidant when the temperature rises to 115 ℃, and stirring, mixing and stirring for 10 min; reduce the stirring speed of high-speed hot mixer, open the pneumatic valve of high temperature blending bunker, slowly blow the material in the high temperature blending bunker to the low temperature blending bunker of low-speed cold mixer in, the low temperature blending bunker cools off through recirculated cooling water, cooling water temperature is 10 ℃, add ACR and outer lubricant low molecular weight polyethylene again in proper order, when cooling mixing stirring, the stirring rotational speed is 300 rpm, treat that material cooling to when 30 ℃ in the low temperature blending bunker, open the pneumatic valve of low temperature blending bunker and unload, obtain the dry blend.
S2 screening and granulating: s1, screening the dry mixture by a screening machine, wherein the screening machine screens and removes hard blocks and large-size particles in the dry mixture in a vibration mode to obtain the dry mixture with qualified quality; the granulator is preheated for 2 hours at 165 ℃, and then the dry mixture with qualified quality is sent to the granulator for granulation, so that material particles with good plasticizing performance are obtained, and then the material particles are sent to the extrusion process for feeding.
S3 extrusion molding: s2 feeding the pellets in an extruder, melting and plasticizing the pellets in the extruder, and extruding the pellets through a die head, wherein the barrel temperature of the extruder is 160 ℃, the screw temperature is 130 ℃, the revolution of a main screw is 22r/min, the die head temperature is 190 ℃, the extrusion speed is 1.72m/min, and the traction speed is 1.84 m/min.
S4 cooling and shaping: after the profile die head is extruded, the profile enters a vacuum setting die for preliminary cooling, the vacuum degree is 54KPa, the profile is tightly adhered to the inner wall of the die for shaping, the vacuum setting die adopts wet spraying in a cooling mode, water is sprayed and cooled in a vaporific mode, and the water temperature is 25 ℃. And (4) after the wet vacuum auxiliary shaping, sending the shaped product into a water tank for further cooling, wherein the temperature of cooling water in the water tank is 18 ℃.
And S5 post-processing: after cooling, shaping and cutting, the section is stacked in a storehouse with the temperature of 20 ℃ and the relative humidity of 45% RH for 1 week, and the stress is gradually released to further eliminate shrinkage and bending.
Example 3
In this example, the raw material components and the ratios of the components are shown in table 1, and a single screw extruder is used in the manufacturing process, which is different from comparative example 1 in the process parameters, and the manufacturing method is as follows:
s1 mixing: adding a PVC resin raw material into a high-temperature mixing bin of a high-speed hot mixer as a base material, starting high-speed mixing and stirring at the stirring speed of 1300r/min, adding a calcium-zinc stabilizer and an active calcium filler when the temperature of the material rapidly rises to 55 ℃ due to heat generation caused by friction, sequentially adding an internal stearic acid lubricant, a silane coupling agent, CPE and an MBS modifier at the temperature of 80 ℃, adding other additives including an ultraviolet absorbent, titanium dioxide, ultramarine and an antioxidant when the temperature rises to 105 ℃, and stirring, mixing and stirring for 5 min; reduce the stirring speed of high-speed hot mixer, open the pneumatic valve of high temperature blending bunker, slowly blow the material in the high temperature blending bunker to the low temperature blending bunker of low-speed cold mixer in, the low temperature blending bunker cools off through recirculated cooling water, cooling water temperature is 5 ℃, add ACR and outer lubricant low molecular weight polyethylene again in proper order, when cooling mixing stirring, the stirring rotational speed is 400 rpm, treat that material cooling to 43 ℃ in the low temperature blending bunker, open the pneumatic valve of low temperature blending bunker and unload, obtain the dry blend.
S2 screening and granulating: s1, screening the dry mixture by a screening machine, wherein the screening machine screens and removes hard blocks and large-size particles in the dry mixture in a vibration mode to obtain the dry mixture with qualified quality; the granulator is preheated for 1 hour at 175 ℃, and then the dry mixture with qualified quality is sent to the granulator for granulation, so that material particles with good plasticizing performance are obtained, and then the material particles are sent to the extrusion working procedure for feeding.
S3 extrusion molding: s2 feeding the pellets in an extruder, melting and plasticizing the pellets in the extruder, and extruding the pellets through a die head, wherein the barrel temperature of the extruder is 165 ℃, the screw temperature is 135 ℃, the revolution of a main screw is 27r/min, the die head temperature is 195 ℃, the extrusion speed is 2.14m/min, and the traction speed is 2.47 m/min.
S4 cooling and shaping: after the profile die head is extruded, the profile enters a vacuum setting die for preliminary cooling, the vacuum degree is 61KPa, the profile is tightly adhered to the inner wall of the die for shaping, the vacuum setting die adopts wet spraying in a cooling mode, water is sprayed and cooled in a vaporific mode, and the water temperature is 20 ℃. And (4) after the wet vacuum auxiliary shaping, sending the shaped product into a water tank for further cooling, wherein the temperature of cooling water in the water tank is 15 ℃.
And S5 post-processing: after cooling, shaping and cutting, the section is stacked in a storehouse for 3 weeks, and the stress is gradually released to further eliminate shrinkage and bending, wherein the temperature of the storehouse is 27 ℃, and the relative humidity is 55% RH.
Comparative example 1
This comparative example is a conventional warm rim profile for a blind and a method of manufacture. Compared with the embodiment 1, the method has no screening process, granulation process and strict material mixing process, the dry mixture has poor plasticity, and only a double-screw extruder is adopted, and the dry mixture is cooled and shaped in a common mode after being extruded. The raw materials are not added with MBS impact modifier, paraffin replaces polyethylene wax to be used as external lubricant, lead salt stabilizer replaces calcium-zinc stabilizer, heavy calcium carbonate replaces superfine light active calcium to be used as filler, anatase type titanium dioxide replaces rutile type titanium dioxide, silane coupling agent and antioxidant are not added, common ultramarine is used for replacing acid-resistant ultramarine, and epoxy soybean oil and fluorescent whitening agent are also added. The components of the raw material formula and the mixture ratio of the components are shown in table 1.
The manufacturing method comprises the steps of weighing raw materials and auxiliary agents, mixing, extruding, shaping, cooling, cutting, stacking and aging. The specific simple material mixing process comprises the following steps: adding SG-5 type PVC resin, lead stearate and a dibasic lead phosphite stabilizer into a mixing bunker, adding CPE and ACR-201 with chlorine content of 36 percent when the temperature is raised to 65 ℃, adding other components in the formula at 95 ℃, stirring for 15min, and then carrying out cold mixing. The parameters of the extrusion process are as follows: the barrel temperature of the extruder was 170 ℃, the screw temperature was 140 ℃, the die temperature was 200 ℃, and the number of revolutions of the main screw was 15 r/min.
Comparative example 2
The formula components and the preparation method are the same as those in example 1, the proportion of the components of the formula and the parameters of the preparation process are changed by referring to comparative example 1 and the experience of the production industry, and the formula ratio and the process parameters can be implemented to illustrate the reasonability and superiority of the formula ratio and the preparation process parameters provided by the invention. The weight parts of the specific formula are shown in table 1, and the manufacturing method and the process parameters are as follows:
s1 mixing: adding a PVC resin raw material into a high-temperature mixing bin of a high-speed hot mixer as a base material, starting high-speed mixing and stirring at the stirring speed of 1400r/min, adding a calcium-zinc stabilizer and an active calcium filler when the temperature of the material rapidly rises to 65 ℃ due to heat generation caused by friction, sequentially adding an internal stearic acid lubricant, a silane coupling agent, CPE and an MBS modifier at 95 ℃, adding other additives including an ultraviolet absorbent, titanium dioxide, ultramarine and an antioxidant when the temperature rises to 120 ℃, and stirring, mixing and stirring for 15 min; reduce the stirring speed of high-speed hot mixer, open the pneumatic valve of high temperature blending bunker, slowly blow the material in the high temperature blending bunker to the low temperature blending bunker of low-speed cold mixer in, the low temperature blending bunker cools off through recirculated cooling water, cooling water temperature is 15 ℃, add ACR and outer lubricant low molecular weight polyethylene again in proper order, when cooling mixing stirring, the stirring rotational speed is 200 rpm, treat that material cooling to 45 ℃ in the low temperature blending bunker, open the pneumatic valve of low temperature blending bunker and unload, obtain the dry blend.
S2 screening and granulating: s1, screening the dry mixture by a screening machine, wherein the screening machine screens and removes hard blocks and large-size particles in the dry mixture in a vibration mode to obtain the dry mixture with qualified quality; the granulator is preheated for 0.5h at 160 ℃, and then the dry mixture with qualified quality is sent to the granulator for granulation, so that material particles with good plasticizing performance are obtained, and then the material particles are sent to the extrusion process for feeding.
S3 extrusion molding: s2 feeding the pellets in an extruder, melting and plasticizing the pellets in the extruder, extruding the pellets through a die head, wherein the barrel temperature of the extruder is 170 ℃, the screw temperature is 140 ℃, the revolution of a main screw is 17r/min, the die head temperature is 200 ℃, the extrusion speed is 1.65m/min, and the traction speed is 1.75 m/min.
S4 cooling and shaping: after the profile die head is extruded, the profile enters a vacuum setting die for preliminary cooling, the vacuum degree is 65KPa, the profile is tightly adhered to the inner wall of the die for shaping, the vacuum setting die adopts wet spraying in a cooling mode, water is sprayed and cooled in a vaporific mode, and the water temperature is 15 ℃. And (4) after the wet vacuum auxiliary shaping, sending the shaped product into a water tank for further cooling, wherein the temperature of cooling water in the water tank is 15 ℃.
And S5 post-processing: after cooling, shaping and cutting, the section is stacked in a storehouse for 5 days, and the stress is gradually released to further eliminate shrinkage and bending, wherein the temperature of the storehouse is 30 ℃, and the relative humidity is 58% RH.
Table 1:
the products obtained in the above examples and comparative examples were observed for appearance quality and measured for surface flatness, and performance tests were conducted in the following manner, the results of which are average values of a plurality of samples, as shown in table 2.
Tensile strength: the test is carried out according to GB/T1040.1-2018.
Bending strength: testing was performed according to ASTM D790-03.
Vicat softening temperature: according to GB/T1633-2000, the detection environment temperature is 24 ℃, the relative humidity is 50% RH, 50N force is used on a microcomputer-controlled thermal deformation Vicat softening point tester, and the heating rate is 50 ℃/h.
Drop hammer impact test and dimensional change rate after heating test: according to GB/T8814-2017, the number of the test samples of each example and each comparative example of the drop weight test is 10, and the dimensional change of the dimensional change rate test after heating is measured and calculated by using a vernier caliper.
Volatile organic compounds and compounds testing: according to GB/T8814-2017, EXC-V60S (4) small VOC environmental test chamber equipment is adopted.
Table 2:
ultraviolet accelerated aging test: the exposure cycles on a QUV UV accelerated weatherometer according to GB/T16422.3-2014 for a total time of 300 h. The aged samples were subjected to tensile strength and bending strength tests, and the results were averaged for each of the samples, and are shown in Table 3.
Table 3:
as can be seen from tables 2 and 3, the warm frame section for the blind manufactured according to the contents provided by the invention has smooth and glossy appearance, no natural bending and good straightness, and has no obvious color change phenomenon after ultraviolet accelerated aging test, and all mechanical strengths are also ensured. The higher the Vicat softening temperature is, the better the dimensional stability of the material when heated is, the smaller the thermal deformation is, namely, the better the thermal deformation resistance is, the drop weight impact strength is mainly used for evaluating the toughness of the section, in the drop weight impact test and the dimensional change rate test after heating, the products obtained by the embodiment of the invention have excellent performances compared with the comparative example, and particularly, the product obtained by the embodiment 1 has more excellent performances.
Claims (7)
1. The warm frame section bar for the shutter is characterized by comprising the following raw materials in parts by weight: 100 parts of PVC resin, 25-32 parts of superfine light activated calcium, 5.1-6.2 parts of calcium-zinc stabilizer, 1.5-2.4 parts of polyethylene wax, 0.9-1.5 parts of stearic acid, 2-4 parts of ACR (polyacrylate), 11-14 parts of CPE (chlorinated polyethylene), 2-4 parts of MBS impact modifier, 4-7 parts of titanium dioxide, 0.3-0.6 part of ultraviolet absorbent, 0.2-0.8 part of silane coupling agent, 0.1-0.3 part of ultramarine and 0.1-0.19 part of antioxidant.
2. The warm frame profile for blinds according to claim 1, wherein the PVC resin is SG-5 type, the CPE chlorine content is 34-37%, the titanium dioxide is rutile type, and the ultramarine is acid-resistant ultramarine.
3. The warm frame profile for the blind according to claim 2, comprising the following raw materials in parts by weight: 100 parts of SG-5 type PVC resin, 30 parts of superfine light activated calcium, 5.5 parts of calcium-zinc stabilizer, 2 parts of polyethylene wax, 1.2 parts of stearic acid, 3 parts of ACR-201, 12 parts of CPE with the chlorine content of 36 percent, 2.5 parts of MBS impact modifier, 6 parts of rutile type titanium dioxide, 0.5 part of UV329 type ultraviolet absorbent, 0.4 part of silane coupling agent, 0.2 part of acid-resistant ultramarine blue and 0.15 part of antioxidant.
4. A manufacturing method of a warm frame section bar for a shutter is characterized by comprising the following steps:
s1, mixing materials: adding a PVC resin raw material into a high-temperature mixing bin of a high-speed hot mixer as a base material, starting high-speed mixing and stirring, adding a calcium-zinc stabilizer and an active calcium filler when the temperature of the material is rapidly increased to 55-60 ℃ due to heat generation by friction, sequentially adding an internal stearic acid lubricant, a silane coupling agent, CPE and an MBS modifier when the temperature is 80-90 ℃, adding other additives including an ultraviolet absorbent, titanium dioxide, ultramarine and an antioxidant when the temperature is increased to 105-115 ℃, and stirring, mixing and stirring for 5-10 min; reducing the stirring speed of the high-speed hot mixer, opening a pneumatic valve of a high-temperature mixing bin, slowly discharging materials in the high-temperature mixing bin into a low-temperature mixing bin of a low-speed cold mixer, cooling, mixing and stirring, sequentially adding ACR (acrylic resin) and external lubricant polyethylene wax, and opening the pneumatic valve of the low-temperature mixing bin to discharge when the materials in the low-temperature mixing bin are cooled to 30-43 ℃ to obtain dry mixed materials;
s2, screening and granulating: s1, screening the dry mixture by a screening machine, and screening to remove hard blocks and large-size particles in the dry mixture to obtain the dry mixture with qualified quality; preheating the granulator 165 at 175 ℃ for 1-2h, then sending the dry mixture with qualified quality to the granulator for granulation to obtain material particles with good plasticity, and then sending the material particles to an extrusion process for feeding;
s3, extrusion molding: s2 feeding the pellets in an extruder, melting, plasticizing and extruding the pellets through a die head, wherein the barrel temperature of the extruder is 160-165 ℃, the screw temperature is 130-135 ℃, the revolution of a main screw is 22-27r/min, the die head temperature is 190-195 ℃, the extrusion speed is 1.72-2.14m/min and the traction speed is 1.84-2.47 m/min;
s4, cooling and shaping: after the section die head is extruded, the section enters a vacuum shaping die for primary cooling, the vacuum is pumped, the vacuum degree is 54-61KPa, the section is enabled to be tightly attached to the inner wall of the die for shaping, then the section is sent into a water tank for further cooling, and the cooling water temperature in the water tank is 15-18 ℃;
s5, post-processing: after cooling, shaping and cutting, gradually releasing stress after the section is stacked in a storehouse for 1-3 weeks, and further eliminating shrinkage and bending, wherein the temperature of the storehouse is 20-27 ℃, and the relative humidity is 45-55% RH.
5. The method for manufacturing a warm rim profile for blinds according to claim 4, wherein in the step of S1: the rotating speed of the high-speed hot mixer during high-speed mixing and stirring is 1000-1300r/min, the rotating speed of the low-speed cold mixer during low-speed mixing and stirring is 300-400r/min, and the low-temperature mixing bin is cooled by circulating cooling water, wherein the temperature of the cooling water is 5-10 ℃.
6. The method for manufacturing a warm rim profile for blinds according to claim 4, wherein in the step of S2: the screening machine adopts a vibration mode to carry out screening.
7. The method for manufacturing a warm rim profile for blinds according to claim 4, wherein in the step of S4: the cooling mode of the vacuum shaping mold is wet spraying: the water is sprayed and cooled in a mist mode, and the water temperature is 20-25 ℃.
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