CN111849071A - PP sheet and preparation method thereof - Google Patents
PP sheet and preparation method thereof Download PDFInfo
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- CN111849071A CN111849071A CN202010545228.4A CN202010545228A CN111849071A CN 111849071 A CN111849071 A CN 111849071A CN 202010545228 A CN202010545228 A CN 202010545228A CN 111849071 A CN111849071 A CN 111849071A
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- 238000002360 preparation method Methods 0.000 title claims description 13
- 239000004743 Polypropylene Substances 0.000 claims abstract description 246
- 239000000463 material Substances 0.000 claims abstract description 172
- -1 polypropylene Polymers 0.000 claims abstract description 78
- 229920001155 polypropylene Polymers 0.000 claims abstract description 66
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000004698 Polyethylene Substances 0.000 claims abstract description 12
- 229920000573 polyethylene Polymers 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 12
- 239000011347 resin Substances 0.000 claims abstract description 11
- 229920005989 resin Polymers 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims description 30
- 102220040412 rs587778307 Human genes 0.000 claims description 22
- 238000001125 extrusion Methods 0.000 claims description 20
- 238000005498 polishing Methods 0.000 claims description 20
- 238000004804 winding Methods 0.000 claims description 20
- 238000005520 cutting process Methods 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 11
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 11
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 5
- 238000003490 calendering Methods 0.000 claims description 5
- 239000004615 ingredient Substances 0.000 claims description 5
- 239000008188 pellet Substances 0.000 claims description 5
- 229920005604 random copolymer Polymers 0.000 claims description 5
- 238000007493 shaping process Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 239000002699 waste material Substances 0.000 abstract description 10
- 231100000252 nontoxic Toxicity 0.000 abstract description 5
- 230000003000 nontoxic effect Effects 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 3
- 235000013305 food Nutrition 0.000 abstract description 3
- 239000005022 packaging material Substances 0.000 abstract description 3
- 238000004806 packaging method and process Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 18
- 238000005457 optimization Methods 0.000 description 8
- 239000000295 fuel oil Substances 0.000 description 6
- 238000012545 processing Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000007334 copolymerization reaction Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 3
- 238000009775 high-speed stirring Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 230000001788 irregular Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
-
- 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
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/0092—Drying moulded articles or half products, e.g. preforms, during or after moulding or cooling
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/24—Calendering
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
-
- 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
-
- 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
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/001—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore a shaping technique combined with cutting, e.g. in parts or slices combined with rearranging and joining the cut parts
-
- 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
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/0009—After-treatment of articles without altering their shape; Apparatus therefor using liquids, e.g. solvents, swelling agents
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
- B29C2043/5816—Measuring, controlling or regulating temperature
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92514—Pressure
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/10—Transparent films; Clear coatings; Transparent materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/20—Recycled plastic
Abstract
The invention discloses a PP sheet, which comprises the following raw materials in parts by weight: 80-120 parts of leftover materials, 32-48 parts of polypropylene resin, 4-6 parts of polypropylene and 0.4-0.6 part of polyethylene, the invention can reasonably utilize the leftover materials generated in the process of preparing the high-transparency PP sheet, so that the leftover materials of the high-transparency PP sheet are used for preparing the PP sheet, further no production waste is generated, the cost can be greatly reduced, the economic benefit of enterprises is improved, and the prepared PP sheet has higher transparency, flatness and smoothness, is nontoxic, sanitary and pollution-free, is a nontoxic, sanitary, green and environment-friendly packaging material, and is suitable for producing food packages such as packaging lunch boxes.
Description
Technical Field
The invention belongs to the technical field of polymer chemical industry, and particularly relates to a PP sheet.
Background
The PP sheet has high transparency, good barrier property, low density, no toxicity and sanitation, can be recycled, does not generate toxic and harmful gas when being heated or combusted, does not harm human health, does not corrode equipment, is a novel green and environment-friendly packaging material, can be prepared into various products through secondary processing modes such as thermal forming and the like, and is mainly used for packaging foods, medicines, medical appliances and the like.
In the production process of the PP sheet, two side surfaces of a PP sheet material belt coming out of a calender are irregular, so that the two side surfaces of a PP sheet material roller collected by a coiler are irregular, the attractiveness of the PP sheet material roller is influenced, the use of the PP sheet material roller in secondary processing is further influenced, two side edges of the PP sheet material belt need to be cut before collection, the PP sheet material roller with the two side edges being neat and meeting the width and size requirements of the PP sheet material belt is obtained, and the PP sheet material belts on the two sides are cut off as leftover materials and are treated as waste products, so that the waste of raw materials is caused.
Disclosure of Invention
The invention aims to provide the PP sheet which can fully utilize the cut scraps in the process of producing the high-transparency PP sheet, and the produced finished product is nontoxic, sanitary and pollution-free and can effectively improve the transparency, the flatness and the smoothness of the finished product.
In order to solve the technical scheme, the invention provides the following technical scheme:
the PP sheet comprises the following preparation raw materials in parts by weight: 80-120 parts of leftover materials, 32-48 parts of polypropylene resin, 4-6 parts of polypropylene and 0.4-0.6 part of polyethylene.
The following is a further optimization of the above technical solution of the present invention:
The leftover materials are cut off in the process of producing the high-transparency PP sheet, and the high-transparency PP sheet is produced by 55-60KG of T30S polypropylene and 35-45KG of PH-5 polypropylene according to the weight part ratio.
Further optimization: the polypropylene resin is preferably polypropylene T30S in the form of pellets.
Further optimization: the polypropylene is preferably 5090T random copolymer polypropylene, Taiwan.
Further optimization: the polyethylene is preferably linear low density polyethylene 7042.
The invention also provides a preparation method for preparing the PP sheet, which comprises the following steps:
1) mixing the ingredients: weighing the components in parts by weight respectively, and stirring and mixing at a high speed;
2) extrusion heating: feeding the stirred and mixed materials into a screw extruder, exhausting and extruding the materials, and conveying the materials to a die head;
3) and (3) extrusion tabletting: the plasticized material in the screw extruder enters a die head under the extrusion action of a screw, and is extruded through the die head to prepare a PP sheet primary finished product;
4) three-roller press polishing, namely cooling, shaping and press polishing the PP sheet primary finished product by using a three-roller press polishing machine;
5) cutting edges: cutting edges at two sides of the PP sheet material belt prepared by the three-roller press polishing;
6) Oiling and drying: coating oil on the surface of the PP sheet material belt subjected to edge cutting by using an oil coating roller device, and then drying to prepare a finished PP sheet material;
7) and collecting, namely collecting the finished PP sheets by using a winding machine.
The following is a further optimization of the above technical solution of the present invention:
the pressure in the die opening in the step 3) is 60Mpa, and the temperature for extrusion molding of the material is 220 ℃.
Further optimization: the temperature of the lower roll of the three-roll calender in the step 4) is 25-30 ℃, the temperature of the middle roll is 34-40 ℃, and the temperature of the upper roll is 45-55 ℃.
Further optimization: the linear speeds of the lower roll, the middle roll and the upper roll of the three-roll calender in the step 4) are all 17-17.5m/min, and the thickness of the PP sheet material belt calendered by the three-roll calender is 0.6-0.8 mm.
Further optimization: and 6) drying the PP sheet material belt coated with the oil by using a drying device, wherein the drying temperature of the drying device is 50-70 ℃, and the linear moving speed of the PP sheet material is 17-17.5 m/min.
By adopting the technical scheme, the invention has ingenious conception, can reasonably utilize the rim charge generated in the process of preparing the high-transparency PP sheet, and can be used for preparing the PP sheet, so that the production waste is not generated at all, the cost can be greatly reduced, the economic benefit of enterprises is improved, and the prepared PP sheet has higher transparency, flatness and smoothness, is nontoxic, sanitary and pollution-free, is a nontoxic, sanitary, green and environment-friendly packaging material, and is suitable for producing food packages such as packaging lunch boxes and the like.
And the overall impact resistance of the PP sheet can be improved by adding polyethylene, so that the PP sheet is easier to plasticize, and has better cold resistance and heat resistance, and the luster and the processability of the PP sheet are improved, so that the produced PP sheet is more stable, and the overall weight is light.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to specific embodiments, it should be understood that the specific embodiments described herein are only for the purpose of explaining the present invention and are not intended to limit the present invention.
Example 1: the PP sheet comprises the following preparation raw materials in parts by weight: 80 parts of leftover materials, 32 parts of polypropylene resin, 4 parts of polypropylene and 0.4 part of polyethylene.
The leftover materials are cut off in the process of producing the high-transparency PP sheet, and the high-transparency PP sheet is produced by T30S polypropylene 55KG and PH-5 polypropylene 35KG in parts by weight.
The leftover materials are used as the components in the production and the manufacture of the PP sheet, so that the waste of the leftover materials is avoided, the cost is saved, the PP sheet produced by adding the leftover materials has better transparency, flatness and smoothness, and the quality of the PP sheet is improved.
The polypropylene resin is preferably polypropylene T30S in the form of pellets.
The polypropylene T30S is polypropylene T30S produced by China oil and gas Co.
The polypropylene T30S is a material with large molecular weight and uniform molecular weight distribution, the tensile breaking strength of the PP sheet is improved from the material, and the transparency, the flatness and the smoothness of the PP sheet can be improved by adopting the polypropylene T30S.
The polypropylene is preferably 5090T random copolymer polypropylene, Taiwan.
The polypropylene is 5090T random copolymerization polypropylene, and the polypropylene 5090T has stronger impact strength, so that the impact strength of the PP sheet can be enhanced; meanwhile, the polypropylene 5090T has certain glossiness, which is beneficial to the texture of the PP sheet.
The polyethylene is preferably linear low density polyethylene 7042.
The linear low density polyethylene 7042 is linear low density polyethylene 7042 produced by petrochemical company limited, china.
The leftover materials are used as components in the production and manufacturing of the PP sheet, waste of the leftover materials is avoided, cost is saved, the PP sheet manufactured by adding the leftover materials is better in transparency, flatness and smoothness, and the quality of the PP sheet is improved.
The preparation method of the PP sheet comprises the following steps:
1) mixing the ingredients: weighing the components in parts by weight, putting the prepared materials into a material tank, and sucking the materials in the material tank into a high-speed stirrer through a material sucking pipe for high-speed stirring.
) Extrusion heating: feeding the stirred and mixed materials into a screw extruder, exhausting and extruding the materials, and conveying the materials to a die head;
in the step 2), the powdery material in the screw extruder enters the machine barrel of the screw extruder under the pushing of the forced feeding screw, and the rotating speed of the forced feeding screw is 60 r/min.
The powdery material entering the machine barrel of the screw extruder moves forward under the pushing of the extruder screw, the material is heated, sheared and extruded section by section in the moving process, the material reaching the air outlet of the machine barrel is basically plasticized, and the gas generated by volatile matters in the material is exhausted at the air outlet of the machine barrel.
The material after exhausting is continuously pushed forward by the screw of the extruder and is heated, sheared and extruded section by section again, and when the material reaches the flange at the front end of the machine barrel, the PP sheet primary product which is in a molten state has the condition of flow molding.
And (3) controlling the temperature of the screw extruder in the step 2) in sections, wherein the heating screw temperature is divided into 6 sections, 1 section is 199 ℃, 2 sections are 219 ℃, 3 sections are 229 ℃, 4-6 sections are 239 ℃, and the heating mode of each temperature control section is electric heating. [1]
3) And (3) extrusion tabletting: and under the screw extrusion action, the plasticized material in the screw extruder enters a die head through a machine head connecting flange, and the material entering the die head passes through a screen changer, a metering pump and a distributor and is extruded from a die orifice through a die head runner to prepare a PP sheet primary finished product.
The pressure in the die opening in the step 3) can reach 60Mpa, a high-temperature melt pressure sensor is mounted on the machine head connecting flange to detect the pressure of the plasticized material, the plasticizing condition of the exhaust extruder and whether the filter screen should be replaced are reflected by the material pressure, and the temperature of material extrusion molding is 220 ℃.
4) And (3) three-roller press polishing, namely cooling, shaping and press polishing the PP sheet primary finished product by using a three-roller press polishing machine.
The specific operation of the step 4) is to introduce the PP sheet primary finished product prepared in the step 3) into a three-roller calender, and cool, shape and calender the PP sheet primary finished product through the rotation of the upper roller of the three-roller calender.
The temperature of the lower roll of the three-roll calender in the step 4) is 25 ℃, the temperature of the middle roll is 30 ℃, and the temperature of the upper roll is 45 ℃.
The linear speeds of the lower roll, the middle roll and the upper roll of the three-roll calender in the step 4) are all 17 m/min.
And in the step 4), the lower roller, the middle roller and the upper roller which rotate through the three-roller calender can roll and pull the PP sheet primary finished product to move, carry out surface calendering treatment on the PP sheet primary finished product to thin the PP sheet primary finished product, and prepare the PP sheet material belt after cooling.
The thickness of the PP sheet material belt is controlled by the linear speed of a roller of the three-roller calender, the linear speed of the roller is accelerated, and the PP sheet material belt becomes thicker; the line speed of the rollers is slowed and the strip of PP sheet material is thinned to a thickness of 0.5 mm.
5) Cutting edges: and cutting edges at two sides of the PP sheet material belt prepared by the three-roller press polishing by adopting a cutting knife to obtain the PP sheet material belt with the width size requirement of the composite product.
And (3) collecting the cut PP leftover materials in the step 5).
6) Oiling and drying: and introducing the PP sheet material belt subjected to edge cutting into an oiling roller device to smear light oil or heavy oil on the surface of the PP sheet material belt, and then drying the PP sheet material belt smeared with the oil to prepare a finished PP sheet.
When light oil or heavy oil is smeared on the PP sheet material belt in the step 6), the surface of the prepared PP sheet material is smoother, and the PP sheet material is convenient to use.
And 6), drying the PP sheet material belt coated with the oil by using a drying device, wherein the drying temperature of the drying device is 50 ℃, and the linear moving speed of the PP sheet material is 17 m/min.
7) Collecting: and (4) drawing the dried finished PP sheet by using a drawing machine and guiding the drawn finished PP sheet to a winding machine for winding.
The winding machine in the step 7) adopts a semi-automatic constant-tension center forced winding machine, and the operation is specifically that the PP sheet prepared in the step 6) is conveyed to the winding machine under the guidance of a tractor, and a PP sheet material belt is flatly wound on a paper tube of the winding machine.
Example 2: the PP sheet comprises the following preparation raw materials in parts by weight: 100 parts of leftover materials, 40 parts of polypropylene resin, 5 parts of polypropylene and 0.5 part of polyethylene.
The leftover materials are cut off in the process of producing the high-transparency PP sheet, and the high-transparency PP sheet is produced by 57.5KG of T30S polypropylene and 40KG of PH-5 polypropylene according to the weight part ratio.
The leftover materials are used as the components in the production and the manufacture of the PP sheet, so that the waste of the leftover materials is avoided, the cost is saved, the PP sheet produced by adding the leftover materials has better transparency, flatness and smoothness, and the quality of the PP sheet is improved.
The polypropylene resin is preferably polypropylene T30S in the form of pellets.
The polypropylene T30S is polypropylene T30S produced by China oil and gas Co.
The polypropylene T30S is a material with large molecular weight and uniform molecular weight distribution, the tensile breaking strength of the PP sheet is improved from the material, and the transparency, the flatness and the smoothness of the PP sheet can be improved by adopting the polypropylene T30S.
The polypropylene is preferably 5090T random copolymer polypropylene, Taiwan.
The polypropylene is 5090T random copolymerization polypropylene, and the polypropylene 5090T has stronger impact strength, so that the impact strength of the PP sheet can be enhanced; meanwhile, the polypropylene 5090T has certain glossiness, which is beneficial to the texture of the PP sheet.
The polyethylene is preferably linear low density polyethylene 7042.
The linear low density polyethylene 7042 is linear low density polyethylene 7042 produced by petrochemical company limited, china.
The leftover materials are used as components in the production and manufacturing of the PP sheet, waste of the leftover materials is avoided, cost is saved, the PP sheet manufactured by adding the leftover materials is better in transparency, flatness and smoothness, and the quality of the PP sheet is improved.
The preparation method of the PP sheet comprises the following steps:
1) mixing the ingredients: weighing the components in parts by weight, putting the prepared materials into a material tank, and sucking the materials in the material tank into a high-speed stirrer through a material sucking pipe for high-speed stirring.
2) Extrusion heating: feeding the stirred and mixed material into a screw extruder, exhausting and extruding the material, and conveying the material to a die head;
In the step 2), the powdery material in the screw extruder enters the machine barrel of the screw extruder under the pushing of the forced feeding screw, and the rotating speed of the forced feeding screw is 65 r/min.
The powdery material entering the machine barrel of the screw extruder moves forward under the pushing of the extruder screw, the material is heated, sheared and extruded section by section in the moving process, the material reaching the air outlet of the machine barrel is basically plasticized, and the gas generated by volatile matters in the material is exhausted at the air outlet of the machine barrel.
The material after exhausting is continuously pushed forward by the screw of the extruder and is heated, sheared and extruded section by section again, and when the material reaches the flange at the front end of the machine barrel, the PP sheet primary product which is in a molten state has the condition of flow molding.
And (3) controlling the temperature of the screw extruder in the step 2) in sections, wherein the heating screw temperature is divided into 6 sections, namely, 200 ℃ in section 1, 220 ℃ in section 2, 230 ℃ in section 3, and 240 ℃ in section 4-6, and the heating mode of each temperature control section is electric heating.
3) And (3) extrusion tabletting: and under the screw extrusion action, the plasticized material in the screw extruder enters a die head through a machine head connecting flange, and the material entering the die head passes through a screen changer, a metering pump and a distributor and is extruded from a die orifice through a die head runner to prepare a PP sheet primary finished product.
The pressure in the die port in the step 3) can reach 60Mpa, a high-temperature melt pressure sensor is mounted on the machine head connecting flange to detect the pressure of the plasticized material, the plasticizing condition of the exhaust extruder and whether the filter screen should be replaced are reflected by the material pressure, and the temperature of material extrusion molding is 225 ℃.
4) And (3) three-roller press polishing, namely cooling, shaping and press polishing the PP sheet primary finished product by using a three-roller press polishing machine.
And 4) the temperature of the lower roll of the three-roll calender in the step 4) is 30 ℃, the temperature of the middle roll is 34 ℃, the temperature of the upper roll is 50 ℃, and the linear speeds of the lower roll, the middle roll and the upper roll of the three-roll calender are all 17.5 m/min.
And in the step 4), the lower roller, the middle roller and the upper roller which rotate through the three-roller calender can roll and pull the PP sheet primary finished product to move, carry out surface calendering treatment on the PP sheet primary finished product to thin the PP sheet primary finished product, and prepare a PP sheet material belt after cooling, wherein the thickness of the PP sheet material belt is 0.8 mm.
5) Cutting edges: and cutting edges at two sides of the PP sheet material belt prepared by the three-roller press polishing by adopting a cutting knife to reach the PP sheet material belt with the width size requirement of the composite product, and collecting and processing the cut PP leftover materials.
6) Oiling and drying: and introducing the PP sheet material belt subjected to edge cutting into an oiling roller device to smear light oil or heavy oil on the surface of the PP sheet material belt, and then drying the PP sheet material belt smeared with the oil to prepare a finished PP sheet.
When light oil or heavy oil is smeared on the PP sheet material belt in the step 6), the surface of the prepared PP sheet material is smoother, and the PP sheet material is convenient to use.
And 6), drying the PP sheet material belt coated with the oil by using a drying device, wherein the drying temperature of the drying device is 60 ℃, and the linear moving speed of the PP sheet material is 17.2 m/min.
7) And collecting, namely, drawing the dried finished PP sheet by using a tractor and guiding the finished PP sheet to a winding machine for winding.
The winding machine in the step 7) adopts a semi-automatic constant-tension center forced winding machine, and the operation is specifically that the PP sheet prepared in the step 6) is conveyed to the winding machine under the guidance of a tractor, and a PP sheet material belt is flatly wound on a paper tube of the winding machine.
Example 3: the PP sheet comprises the following preparation raw materials in parts by weight: 120 parts of leftover materials, 48 parts of polypropylene resin, 6 parts of polypropylene and 0.6 part of polyethylene.
The leftover materials are cut off in the process of producing the high-transparency PP sheet, and the high-transparency PP sheet is produced by 60KG of T30S polypropylene and 45KG of PH-5 polypropylene according to the weight part ratio.
The leftover materials are used as the components in the production and the manufacture of the PP sheet, so that the waste of the leftover materials is avoided, the cost is saved, the PP sheet produced by adding the leftover materials has better transparency, flatness and smoothness, and the quality of the PP sheet is improved.
The polypropylene resin is preferably polypropylene T30S in the form of pellets.
The polypropylene T30S is polypropylene T30S produced by China oil and gas Co.
The polypropylene T30S is a material with large molecular weight and uniform molecular weight distribution, the tensile breaking strength of the PP sheet is improved from the material, and the transparency, the flatness and the smoothness of the PP sheet can be improved by adopting the polypropylene T30S.
The polypropylene is preferably 5090T random copolymer polypropylene, Taiwan.
The polypropylene is 5090T random copolymerization polypropylene, and the polypropylene 5090T has stronger impact strength, so that the impact strength of the PP sheet can be enhanced; meanwhile, the polypropylene 5090T has certain glossiness, which is beneficial to the texture of the PP sheet.
The polyethylene is preferably linear low density polyethylene 7042.
The linear low density polyethylene 7042 is linear low density polyethylene 7042 produced by petrochemical company limited, china.
The leftover materials are used as components in the production and manufacturing of the PP sheet, waste of the leftover materials is avoided, cost is saved, the PP sheet manufactured by adding the leftover materials is better in transparency, flatness and smoothness, and the quality of the PP sheet is improved.
The preparation method of the PP sheet comprises the following steps:
1) mixing the ingredients: weighing the components in parts by weight, putting the prepared materials into a material tank, and sucking the materials in the material tank into a high-speed stirrer through a material sucking pipe for high-speed stirring.
2) Extrusion heating: feeding the stirred and mixed material into a screw extruder, exhausting and extruding the material, and conveying the material to a die head;
in the step 2), the powdery material in the screw extruder enters the machine barrel of the screw extruder under the pushing of the forced feeding screw, and the rotating speed of the forced feeding screw is 65 r/min.
The powdery material entering the machine barrel of the screw extruder moves forward under the pushing of the extruder screw, the material is heated, sheared and extruded section by section in the moving process, the material reaching the air outlet of the machine barrel is basically plasticized, and the gas generated by volatile matters in the material is exhausted at the air outlet of the machine barrel.
The material after exhausting is continuously pushed forward by the screw of the extruder and is heated, sheared and extruded section by section again, and when the material reaches the flange at the front end of the machine barrel, the PP sheet primary product which is in a molten state has the condition of flow molding.
And (3) controlling the temperature of the screw extruder in the step 2) in sections, wherein the heating screw temperature is divided into 6 sections, namely, 200 ℃ in section 1, 220 ℃ in section 2, 230 ℃ in section 3, and 240 ℃ in section 4-6, and the heating mode of each temperature control section is electric heating.
3) And (3) extrusion tabletting: and under the screw extrusion action, the plasticized material in the screw extruder enters a die head through a machine head connecting flange, and the material entering the die head passes through a screen changer, a metering pump and a distributor and is extruded from a die orifice through a die head runner to prepare a PP sheet primary finished product.
The pressure in the die port in the step 3) can reach 60Mpa, a high-temperature melt pressure sensor is mounted on the machine head connecting flange to detect the pressure of the plasticized material, the plasticizing condition of the exhaust extruder and whether the filter screen should be replaced are reflected by the material pressure, and the temperature of material extrusion molding is 230 ℃.
4) And (3) three-roller press polishing, namely cooling, shaping and press polishing the PP sheet primary finished product by using a three-roller press polishing machine.
And 4) the temperature of the lower roll of the three-roll calender in the step 4) is 35 ℃, the temperature of the middle roll is 40 ℃, the temperature of the upper roll is 55 ℃, and the linear speeds of the lower roll, the middle roll and the upper roll of the three-roll calender are all 17.5 m/min.
And in the step 4), the lower roller, the middle roller and the upper roller which rotate through the three-roller calender can roll and pull the PP sheet primary finished product to move, carry out surface calendering treatment on the PP sheet primary finished product to thin the PP sheet primary finished product, and prepare a PP sheet material belt after cooling, wherein the thickness of the PP sheet material belt is 0.8 mm.
5) Cutting edges: and cutting edges at two sides of the PP sheet material belt prepared by the three-roller press polishing by adopting a cutting knife to reach the PP sheet material belt with the width size requirement of the composite product, and collecting and processing the cut PP leftover materials.
6) Oiling and drying: and introducing the PP sheet material belt subjected to edge cutting into an oiling roller device to smear light oil or heavy oil on the surface of the PP sheet material belt, and then drying the PP sheet material belt smeared with the oil to prepare a finished PP sheet.
When light oil or heavy oil is smeared on the PP sheet material belt in the step 6), the surface of the prepared PP sheet material is smoother, and the PP sheet material is convenient to use.
And 6) drying the PP sheet material belt coated with the oil by using a drying device, wherein the drying temperature of the drying device is 70 ℃, and the linear moving speed of the PP sheet material belt is 17.5 m/min.
7) And collecting, namely, drawing the dried finished PP sheet by using a tractor and guiding the finished PP sheet to a winding machine for winding.
The winding machine in the step 7) adopts a semi-automatic constant-tension center forced winding machine, and the operation is specifically that the PP sheet prepared in the step 6) is conveyed to the winding machine under the guidance of a tractor, and a PP sheet material belt is flatly wound on a paper tube of the winding machine.
Conclusion analysis: the following table shows the results of the performance tests of PP sheets according to examples 1-3.
TABLE 1 mechanical Properties
TABLE 2 measurement of light transmittance and Heat distortion temperature Properties
The data in tables 1 and 2 show that the PVC film prepared by the present invention has significantly excellent mechanical strength, light transmittance and thermal deformation temperature, wherein the PP sheet has the optimum mechanical strength, light transmittance and thermal deformation temperature in the formulation of example 2.
It will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in the embodiments described above without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims.
Claims (10)
1. A PP sheet characterized by: the preparation raw materials comprise the following components in parts by weight: 80-120 parts of leftover materials, 32-48 parts of polypropylene resin, 4-6 parts of polypropylene and 0.4-0.6 part of polyethylene.
2. The PP sheet according to claim 1, wherein: the leftover materials are cut off in the process of producing the high-transparency PP sheet, and the high-transparency PP sheet is produced by 55-60KG of T30S polypropylene and 35-45KG of PH-5 polypropylene according to the weight part ratio.
3. The PP sheet according to claim 2, wherein: the polypropylene resin is preferably polypropylene T30S in the form of pellets.
4. The PP sheet according to claim 5, wherein: the polypropylene is preferably 5090T random copolymer polypropylene, Taiwan.
5. The PP sheet according to claim 6, wherein: the polyethylene is preferably linear low density polyethylene 7042.
6. A process for the preparation of the PP sheet according to claims 1 to 5, wherein: the preparation method specifically comprises the following steps:
1) mixing the ingredients: weighing the components in parts by weight respectively, and stirring and mixing at a high speed;
2) extrusion heating: feeding the stirred and mixed materials into a screw extruder, exhausting and extruding the materials, and conveying the materials to a die head;
3) and (3) extrusion tabletting: the plasticized material in the screw extruder enters a die head under the extrusion action of a screw, and is extruded through the die head to prepare a PP sheet primary finished product;
4) three-roller press polishing, namely cooling, shaping and press polishing the PP sheet primary finished product by using a three-roller press polishing machine;
5) cutting edges: cutting edges at two sides of the PP sheet material belt prepared by the three-roller press polishing;
6) oiling and drying: coating oil on the surface of the PP sheet material belt subjected to edge cutting by using an oil coating roller device, and then drying to prepare a finished PP sheet material;
7) And collecting, namely collecting the finished PP sheets by using a winding machine.
7. The method for preparing a PP sheet according to claim 6, wherein: the pressure in the die opening in the step 3) is 60Mpa, and the temperature for extrusion molding of the material is 220 ℃.
8. The method for preparing a PP sheet according to claim 7, wherein: the temperature of the lower roll of the three-roll calender in the step 4) is 25-30 ℃, the temperature of the middle roll is 34-40 ℃, and the temperature of the upper roll is 45-55 ℃.
9. The method for preparing a PP sheet according to claim 8, wherein: the linear speeds of the lower roll, the middle roll and the upper roll of the three-roll calender in the step 4) are all 17-17.5m/min, and the thickness of the PP sheet material belt calendered by the three-roll calender is 0.6-0.8 mm.
10. The method for preparing a PP sheet according to claim 9, wherein: and 6) drying the PP sheet material belt coated with the oil by using a drying device, wherein the drying temperature of the drying device is 50-70 ℃, and the linear moving speed of the PP sheet material is 17-17.5 m/min.
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