CN113199841A - Scratch-resistant polypropylene film without surface treatment and preparation method thereof - Google Patents
Scratch-resistant polypropylene film without surface treatment and preparation method thereof Download PDFInfo
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- CN113199841A CN113199841A CN202110749121.6A CN202110749121A CN113199841A CN 113199841 A CN113199841 A CN 113199841A CN 202110749121 A CN202110749121 A CN 202110749121A CN 113199841 A CN113199841 A CN 113199841A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
- B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0008—Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/584—Scratch resistance
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- Laminated Bodies (AREA)
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Abstract
The invention discloses a scratch-resistant polypropylene film without surface treatment and a preparation method thereof, and relates to the technical field of polypropylene. The polypropylene film is of a three-layer structure consisting of a surface layer, a middle layer and a bottom layer, wherein the surface layer is made of sarin resin; the raw materials of the middle layer comprise the following components in parts by weight: 60-90 parts of polypropylene, 10-40 parts of polyethylene and 1-4 parts of a cross-linking agent; the raw material of the bottom layer is firm resin. According to the invention, three layers of polypropylene films made of different materials are extruded simultaneously by adopting three-layer co-extrusion casting equipment, and the surface layer adopts the surlyn resin, so that the problem of non-scratch resistance of the surface of the polypropylene film is solved; the middle layer is made of a mixed material of polypropylene and polyethylene, so that the formula cost is reduced; the bottom layer adopts firm resin, and the problem of fastness of the direct composite adhesion force of the polypropylene film and the plate and the metal piece is solved. Thereby achieving the purposes of reducing production procedures and formula cost. The polypropylene film of the invention does not need surface treatment and has zero VOC.
Description
Technical Field
The invention relates to the technical field of polypropylene films, in particular to a scratch-resistant polypropylene film without surface treatment and a preparation method thereof.
Background
At present, two production modes are adopted for the home decoration polypropylene decorative film: (1) single layer extrusion casting; (2) four or five roll calendering. The two production modes can only produce the polypropylene decorative film with single material.
The two production methods described above have the following common disadvantages: (1) the produced polypropylene decorative film is made of single components, and the product performance is single; (2) because the surface tension of the polypropylene material is low, when the composite board or the surface performance is treated, a middle grafting coating needs to be coated firstly, and the adhesive force between the surface coating or the glue layer and the polypropylene decorative film is improved. Meanwhile, the production flow and the product cost are increased; (3) the polypropylene decorative film has poor surface scratch resistance, and in order to improve the surface scratch resistance, a scratch-resistant coating needs to be processed on the surface.
The calendering method also has the following disadvantages: (1) the equipment investment capital is high, and the energy consumption is high; (2) production and configuration personnel are more; (3) because the calendering production involves the peeling of the polypropylene film and the roller, a large amount of auxiliary agents are required to be added into the formula, and the formula cost is greatly increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a scratch-resistant polypropylene film without surface treatment and a preparation method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that: the scratch-resistant polypropylene film without surface treatment is of a three-layer structure consisting of a surface layer, a middle layer and a bottom layer, wherein the surface layer is made of sarin resin; the raw materials of the middle layer comprise the following components in parts by weight: 60-90 parts of polypropylene, 10-40 parts of polyethylene and 1-4 parts of a cross-linking agent; the raw material of the bottom layer is firm resin.
The main characteristics of the forest fingers are that the forest fingers have excellent low-temperature impact toughness; excellent abrasion and scratch resistance; excellent chemical resistance; transparent, clear and soft and luxurious luster; excellent melt strength (tensile without breaking under melt); the epoxy resin and polypropylene are directly adhered to the surfaces of metal, glass and natural fiber for modification and protection, and the plastic injection blow molding can be carried out.
The firm resin has the advantages of low-temperature softness, chemical resistance, transparency, good compatibility and high adhesive force with metal foil, and can improve the composite strength of PET, PA, AL and base materials; the polypropylene cup and the sealing cover material are easy to tear and can reach the sealing strength required by regulations; the high-speed packaging film improves the yield and the production efficiency when packaging hot products; the ultra-low temperature heat-sealing film has high heat-sealing strength; a base material of the halogen-free flame-retardant cable material; the coating has good inclusion on inorganic matters and good processability and surface performance; the base material in the cable material does not corrode the metal conductor.
The middle layer is prepared by compounding 60-90 parts of polypropylene and 10-40 parts of polyethylene, the polyethylene has good toughness, and the toughness of the polypropylene film can be improved to a certain extent by blending the polyethylene with the polypropylene. In addition, when radiation crosslinking is carried out, the polypropylene as the main resin can be crosslinked, and the polyethylene has better crosslinking property, so that the polypropylene as the main resin can be better crosslinked during blending. However, when the amount of polyethylene added is too high, the mechanical properties of the polypropylene film may be degraded. The applicant of the invention proves through experiments that the subsequent processing performance of the product can be improved by selecting the proper amount of polypropylene; the brittleness of the polypropylene film can be improved by selecting the polyethylene with proper dosage; when the dosage of the polyethylene and the polypropylene is in accordance with the above proportion, the prepared polypropylene film has better comprehensive performance.
Preferably, the melt flow rate of the surlyn resin is 2-8 g/10min, and the tensile strength is more than or equal to 25kg/cm2The molding shrinkage is less than or equal to 1 percent, and the bending strength is more than or equal to 38kg/cm2(ii) a The melt flow rate of the firm resin is 1-6 g/10min, the melting peak temperature is 95-110 ℃, and the content of methacrylic acid is more than or equal to 8 wt.%. When the surlyn resin meets the above requirements, the prepared polypropylene film has better comprehensive performance.
Preferably, the surface layer comprises the following components in parts by weight: 95-98 parts of sarin resin, 1.5-3 parts of a cross-linking agent, 0.5-1 part of an ultraviolet absorbent and 0.3-0.8 part of an antioxidant.
The scratch-resistant polypropylene film is produced by three-layer co-extrusion casting, and the surface layer can be directly hot-pasted and compounded on the surface of polypropylene.
Preferably, the cross-linking agent comprises at least one of difunctional monomers 1, 6-hexanediol diacrylate (HDDA), tripropylene glycol diacrylate (TPGDA), dipropylene glycol diacrylate (DPGDA), multifunctional monomer trimethylolpropane triacrylate (TMPTA), pentaerythritol tetraacrylate (PETTA), ditrimethylolpropane tetraacrylate (DTMPTA), bis-pentaerythritol hexaacrylate (DPHA), triallyl isocyanurate (TAIC).
Preferably, the mass ratio of the surface layer, the middle layer and the bottom layer is 5-20: 60-80: 5-20.
The scratch resistance of the surface of the polypropylene film has a great relationship with the roughness of surface grains, and generally, the rougher the surface grains are, the better the scratch resistance of the surface is. When the surface of the film is plain, the thicker the surface layer is, the better the surface layer is (the mass percentage is 20%), the scratch resistance of the surface can be improved; the surface of the film is deeply embossed, and the thickness of the surface layer can be thinner (5% by mass). The bottom layer of the polypropylene film is 5-20% in mass percent, the thickness of the glue layer on the bottom layer is designed according to the roughness of the surface of the plate, and the rougher the glue layer is, the thicker the glue layer is.
Preferably, the melt flow rate of the polypropylene is 2.5-6 g/10min, the cantilever beam impact strength is more than or equal to 40J/m, and the tensile yield strength is more than or equal to 25 MPa.
Preferably, the polyethylene is linear low-density polyethylene, the melt flow rate is 2-4.5 g/10min, the elongation at break is more than or equal to 550%, the tensile breaking strength is more than or equal to 12MPa, and the tensile yield strength is more than or equal to 9 MPa.
In a second aspect, the present invention provides a method for preparing the above polypropylene film, comprising the steps of: extruding the raw materials of the surface layer, the middle layer and the bottom layer by three-layer co-extrusion casting equipment, and then irradiating and crosslinking by low-energy electron beam radiation equipment to obtain the scratch-resistant polypropylene film without surface treatment.
Preferably, the extrusion temperature of the surface layer is 190-220 ℃.
Preferably, the extrusion temperature of the middle layer is 210-240 ℃.
Preferably, the extrusion temperature of the bottom layer is 190-220 ℃.
Preferably, the three-layer co-extruded polypropylene film is subjected to electron beam irradiation (250 KV, 35-100 KGy), so that the adhesive force between three layers of different materials is enhanced, and the tensile strength and the stiffness of the polypropylene film are improved.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, three layers of polypropylene films made of different materials are extruded simultaneously by adopting three-layer co-extrusion casting equipment, and the surface layer adopts the surlyn resin, so that the problem of non-scratch resistance of the surface of the polypropylene film is solved; the middle layer is made of a mixed material of polypropylene and polyethylene, so that the formula cost is reduced; the bottom layer adopts firm resin, and the problem of fastness of the direct composite adhesion force of the polypropylene film and the plate and the metal piece is solved. Thereby achieving the purposes of reducing production procedures and formula cost. The polypropylene film of the invention does not need surface treatment and has zero VOC.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
Example 1
A polypropylene film with 0.25mm thickness, scratch-resistant, stain-resistant and frosted surface is used for the facing and coating of flat-surface plates (such as medium-high density fiberboard and aluminum plate). The polypropylene film is a three-layer structure consisting of a surface layer, a middle layer and a bottom layer, based on the total mass of the polypropylene film, the mass percent of the surface layer is 10%, the mass percent of the middle layer is 80%, and the mass percent of the bottom layer is 10%, and the polypropylene film is prepared by adopting the following method:
(1) the surface layer is made of 95 parts of DuPont sarin resin Surlyn 8140+2 parts of monomer TAIC +0.5 part of ultraviolet absorbent +0.5 part of antioxidant, the extrusion temperature is controlled at 210 ℃, and the thickness of the surface layer is controlled at 0.025 mm.
(2) The middle layer is made of 85 parts of polypropylene, 15 parts of polyethylene and 1.5 parts of monomer TAIC, the extrusion temperature is controlled at 220 ℃, and the thickness of the middle layer is controlled at 0.2 mm.
The polypropylene is Shanghai Jinshan petrochemical M250E random copolymerization polypropylene, and the melt flow rate is 2.5 +/-0.7 g/10 min; the polyethylene is Exxon ExCEED 2018MA metallocene polyethylene, and the melt flow rate is 2g/10 min.
(3) The bottom layer is made of Dupont firm (Nucrel) resin EMAA 0903, the extrusion temperature is controlled at 200 ℃, and the thickness of the middle layer is controlled at 0.025 mm.
(4) The polypropylene film with the thickness of 0.25mm and the width of 1260mm is produced by three-layer coextrusion casting equipment.
(5) The polypropylene film was passed through an accelerating voltage: 250KeV, dose: and (3) irradiating and crosslinking by using 35KGy low-energy electron beam radiation equipment to finally produce the scratch-resistant and pollution-resistant polypropylene film without surface treatment and with zero VOC.
Example 2
A polypropylene film with 0.25mm thickness, scratch resistance, stain resistance and frosted surface is used for veneering plates (such as shaving boards, wood-plastic boards and wood boards) with rough surfaces. The polypropylene film is a three-layer structure consisting of a surface layer, a middle layer and a bottom layer, based on the total mass of the polypropylene film, the mass percent of the surface layer is 5%, the mass percent of the middle layer is 75%, and the mass percent of the bottom layer is 20%, and the polypropylene film is prepared by adopting the following method:
(1) 98 parts of DuPont sarin resin Surlyn 8140, 3 parts of monomer TAIC, 1 part of ultraviolet absorbent and 0.8 part of antioxidant are adopted in the surface layer, the extrusion temperature is controlled at 200 ℃, and the thickness of the surface layer is controlled at 0.0125 mm.
(2) The middle layer is made of 90 parts of polypropylene, 10 parts of polyethylene and 4 parts of monomer TAIC, the extrusion temperature is controlled at 220 ℃, and the thickness of the middle layer is controlled at 0.1875 mm.
The polypropylene is Shanghai Kingshi petrochemical M250E random copolymer polypropylene, the melt flow rate is 2.5 +/-0.7 g/10min, the polyethylene is Exxon Mobil EXCEED 2018MA metallocene polyethylene, and the melt flow rate is 2g/10 min.
(3) The bottom layer is made of Dupont firm (Nucrel) resin EMAA 0903, the extrusion temperature is controlled at 200 ℃, and the thickness of the middle layer is controlled at 0.05 mm. Increase bottom glue thickness, it is firm with the shaving board laminating.
(4) The polypropylene film with the thickness of 0.25mm and the width of 1260mm is produced by three-layer coextrusion casting equipment.
(5) The polypropylene film was passed through an accelerating voltage: 250KeV, dose: and (3) irradiating and crosslinking by using 35KGy low-energy electron beam radiation equipment to finally produce the scratch-resistant and pollution-resistant polypropylene film without surface treatment and with zero VOC.
Example 3
A0.16 mm thick scratch-resistant stain-resistant plain polypropylene film is used for veneering and cladding flat-surface plates (such as medium-high density fiberboard and aluminum plates). The polypropylene film is a three-layer structure consisting of a surface layer, a middle layer and a bottom layer, based on the total mass of the polypropylene film, the mass percent of the surface layer is 20%, the mass percent of the middle layer is 75%, and the mass percent of the bottom layer is 5%, and the polypropylene film is prepared by adopting the following method:
(1) 97 parts of DuPont sarin resin Surlyn 8140, 1.5 parts of monomer TAIC, 0.8 part of ultraviolet absorbent and 0.3 part of antioxidant are adopted in the surface layer, the extrusion temperature is controlled at 200 ℃, and the thickness of the surface layer is controlled at 0.032 mm.
(2) The middle layer is made of 50 parts of polypropylene A, 10 parts of polypropylene B, 40 parts of polyethylene and 1 part of monomer TAIC, the extrusion temperature is controlled at 220 ℃, and the thickness of the middle layer is controlled at 0.12 mm.
The polypropylene A is Shanghai Jinshan petrochemical M250E random copolymer polypropylene, the melt flow rate is 2.5 +/-0.7 g/10min, the polypropylene B is Maominaijing PPH-T03, the melt flow rate is 3.0 +/-0.9 g/10min, the polyethylene is Exxon Mobil EXCEED 2018MA metallocene polyethylene, and the melt flow rate is 2g/10 min.
(3) The bottom layer adopts Dupont firm (Nucrel) resin EMAA 0903, the extrusion temperature is controlled at 200 ℃, and the thickness of the intermediate layer is controlled at 0.008 mm.
(4) The polypropylene film with the thickness of 0.16mm and the width of 1260mm is produced by three-layer coextrusion casting equipment.
(5) The polypropylene film was passed through an accelerating voltage: 200KeV, dose: 60 KGy's low energy electron beam radiation equipment irradiation crosslinking improves the crosslinking density, keeps the surface line. Finally, the scratch-resistant polypropylene film without surface treatment and with zero VOC is produced.
Example 4
A0.18 mm thick, scratch-resistant, stain-resistant plain polypropylene film is used for veneering and coating plates with rough surfaces (such as shaving boards, wood-plastic boards and wood boards). The polypropylene film is a three-layer structure consisting of a surface layer, a middle layer and a bottom layer, the mass percent of the surface layer is 15%, the mass percent of the middle layer is 70%, and the mass percent of the bottom layer is 15% based on the total mass of the polypropylene film, and the polypropylene film is prepared by adopting the following method:
(1) the surface layer adopts 96.7 parts of DuPont sarin resin Surlyn 8140+2 parts of monomer TAIC +0.8 part of ultraviolet absorbent +0.5 part of antioxidant, the extrusion temperature is controlled at 200 ℃, and the thickness of the surface layer is controlled at 0.027 mm.
(2) The middle layer is made of 50 parts of polypropylene A, 25 parts of polypropylene B, 25 parts of polyethylene and 2 parts of monomer TAIC, the extrusion temperature is controlled at 220 ℃, and the thickness of the middle layer is controlled at 0.126 mm.
The polypropylene A is Shanghai Jinshan petrochemical M250E random copolymer polypropylene, the melt flow rate is 2.5 +/-0.7 g/10min, the polypropylene B is Maominaijing PPH-T03, the melt flow rate is 3.0 +/-0.9 g/10min, the polyethylene is Exxon Mobil EXCEED 2018MA metallocene polyethylene, and the melt flow rate is 2g/10 min.
(3) The bottom layer adopts Dupont firm (Nucrel) resin EMAA 0903, the extrusion temperature is controlled at 200 ℃, and the thickness of the intermediate layer is controlled at 0.027 mm.
(4) The polypropylene film with the thickness of 0.18mm and the width of 1260mm is produced by three-layer coextrusion casting equipment.
(5) The polypropylene film was passed through an accelerating voltage: 200KeV, dose: 60 KGy's low energy electron beam radiation equipment irradiation crosslinking improves the crosslinking density, keeps the surface line. Finally, the scratch-resistant polypropylene film without surface treatment and with zero VOC is produced.
Example 5
An embodiment of the polypropylene film of the present invention is different from embodiment 4 only in that the Surlyn resin used is Surlyn 8527, dupont Surlyn resin.
Comparative example 1
A polypropylene film was produced in a manner different from that of example 1 in that the mass ratio of the top layer, the intermediate layer and the bottom layer was 30:50: 20.
Comparative example 2
A polypropylene film, which was prepared by a method different from that of example 1, wherein the intermediate layer had the following composition: 85 parts of polypropylene +15 parts of polyethylene, the types of polypropylene and polyethylene being the same as in example 1.
Comparative example 3
A polypropylene film, which was prepared by a method different from that of example 1, wherein the intermediate layer had the following composition: 88 parts of polypropylene +12 parts of polyethylene +5 parts of monomeric TAIC, the polypropylene and the polyethylene being of the same type as in example 1.
Examples of effects
The polypropylene films prepared in examples 1 to 5 and comparative examples 1 to 3 were subjected to performance tests, the test standards are shown in table 1, wherein the test results of surface hardness, surface scratch resistance, surface abrasion resistance, surface stain resistance and VOC are shown in table 2, and the test results of tensile strength, right-angle tear strength and elongation at break are shown in table 3.
TABLE 1
| Item | Test standard |
| Surface hardness | GB/T17657-2013 4.57 |
| Surface scratch resistance | GB/T17657-2013 4.39 |
| Surface wear resistance | GB/T17657-2013 4.44 |
| Surface stain resistance | GB/T17657-2013 4.40 |
| VOC | HJT-400-2007 |
| Tensile strength | GB/T3830-2008 |
| Right angle tear strength | GB/T3830-2008 |
| Elongation at break | GB/T3830-2008 |
TABLE 2
| Surface hardness | Surface scratch resistance | Surface wear resistance | Surface stain resistance | VOC | |
| Example 1 | H | 1.0N surface without continuous scratch | 42mg/100r | 4-5 stages | ND |
| Example 2 | H | 1.0N surface without continuous scratch | 56mg/100r | 4-5 stages | ND |
| Example 3 | 2H | 2.0N surface without continuous scratch | 30mg/100r | Grade 5 | ND |
| Example 4 | 2H | 2.0N surface without continuous scratch | 37mg/100r | 4-5 stages | ND |
| Example 5 | H | 1.0N surface without continuous scratch | 43mg/100r | 4-5 stages | ND |
| Comparative example 1 | 2H | 2.0N surface without continuous scratch | 21mg/100r | Grade 5 | ND |
| Comparative example 2 | H | 1.0N surface without continuous scratch | 40mg/100r | 4-5 stages | ND |
| Comparative example 3 | H | 1.0N surface without continuous scratch | 44mg/100r | 4-5 stages | ND |
Note: ND means not detected
As can be seen from table 2, the polypropylene film prepared according to the present invention has good surface hardness, surface scratch resistance, surface abrasion resistance, and surface stain resistance, and the VOC is ND.
TABLE 3
| Tensile strength MPa | Right angle tear strength kN/m | Elongation at break% | |
| Example 1 | 18.3 | 172 | 429 |
| Example 2 | 22.5 | 223 | 498 |
| Example 3 | 15.4 | 137 | 376 |
| Example 4 | 17.6 | 158 | 407 |
| Practice ofExample 5 | 16.9 | 143 | 377 |
| Comparative example 1 | 17.5 | 161 | 409 |
| Comparative example 2 | 13.2 | 107 | 314 |
| Comparative example 3 | 21.6 | 234 | 358 |
As can be seen from Table 3, the tensile strength, the right-angle tear strength and the elongation at break of the polypropylene films prepared in the embodiments 1 to 5 can all reach more than 15MPa, more than 130kN/m and more than 370%, respectively, and the polypropylene films prepared by the scheme provided by the invention also have good mechanical properties. The comparative example 1 has a small amount of intermediate layers and a large number of surface layers, and has little influence on mechanical properties, but the cost is greatly increased due to the high unit price of the surface layer material, and the economic benefit is low. Comparative example 3 too much cross-linking agent, too high cross-linking degree of the product, reduced elongation at break, reduced toughness, and unfavorable for the subsequent plastic molding.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The scratch-resistant polypropylene film without surface treatment is characterized by being of a three-layer structure consisting of a surface layer, a middle layer and a bottom layer, wherein the raw material of the surface layer comprises sarin resin; the raw materials of the middle layer comprise the following components in parts by weight: 60-90 parts of polypropylene, 10-40 parts of polyethylene and 1-4 parts of a cross-linking agent; the raw material of the bottom layer is firm resin.
2. The scratch-resistant polypropylene film without surface treatment of claim 1, wherein the melt flow rate of the surlyn resin is 2-8 g/10min, and the tensile strength is not less than 25kg/cm2The molding shrinkage is less than or equal to 1 percent, and the bending strength is more than or equal to 38kg/cm2(ii) a The melt flow rate of the firm resin is 1-6 g/10min, the melting peak temperature is 95-110 ℃, and the content of methacrylic acid is more than or equal to 8 wt.%.
3. The polypropylene film of claim 1, wherein the facing layer comprises the following ingredients in parts by weight: 95-98 parts of sarin resin, 1.5-3 parts of a cross-linking agent, 0.5-1 part of an ultraviolet absorbent and 0.3-0.8 part of an antioxidant.
4. The polypropylene film according to claim 1, wherein the mass ratio of the surface layer, the middle layer and the bottom layer is 5-20: 60-80: 5-20.
5. The polypropylene film according to claim 1, wherein the melt flow rate of the polypropylene is 2.5-6 g/10min, the Izod impact strength is not less than 40J/m, and the tensile yield strength is not less than 25 MPa.
6. The polypropylene film according to claim 1, wherein the polyethylene is a linear low density polyethylene, the melt flow rate is 2 to 4.5g/10min, the elongation at break is not less than 550%, the tensile strength at break is not less than 12MPa, and the tensile yield strength is not less than 9 MPa.
7. The method for producing a polypropylene film according to any one of claims 1 to 6, comprising the steps of: extruding the raw materials of the surface layer, the middle layer and the bottom layer by three-layer co-extrusion casting equipment, and then irradiating and crosslinking by low-energy electron beam radiation equipment to obtain the scratch-resistant polypropylene film without surface treatment.
8. The method of claim 7, wherein the extrusion temperature of the face layer is 190 to 220 ℃.
9. The method according to claim 7, wherein the extrusion temperature of the intermediate layer is 210 to 240 ℃.
10. The method of claim 7, wherein the bottom layer has an extrusion temperature of 190 to 220 ℃.
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| CN104292507A (en) * | 2014-09-24 | 2015-01-21 | 广东天安新材料股份有限公司 | Crosslinking agent for radiation crosslinking and polypropylene material thereof |
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