Antistatic and wear-resistant BOPP (biaxially-oriented polypropylene) functional film

Abstract

The invention relates to the technical field of BOPP (biaxially-oriented polypropylene) films, in particular to an antistatic and wear-resistant BOPP functional film which is prepared by biaxially stretching and directly co-extruding an upper surface layer, a core layer and a lower surface layer, wherein the upper surface layer and the lower surface layer are antistatic wear-resistant layers; the preparation process of the antistatic wear-resistant material comprises the following steps: carrying out a ring-opening reaction on polyether ester amide and an organosilicon compound containing epoxy groups at two ends according to a molar ratio of 1: 1 to obtain organosilicon modified polyether ester amide; the organic silicon modified polyether ester amide and erucyl amide are subjected to a ring-opening reaction according to the molar ratio of 1: 1, and the antistatic wear-resistant material is obtained; the antistatic wear-resistant material prepared by connecting the polyether ester amide and the erucyl amide through the organosilicon compound is added into the BOPP film, so that the BOPP film has the advantages of long-acting antistatic property, wear resistance and thermal stability at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of BOPP films, and particularly relates to an antistatic and wear-resistant BOPP functional film. Background Art

[0002] Biaxially oriented polypropylene film (BOPP) is generally a multi-layer co-extruded film. It is made by co-extruding polypropylene particles into a sheet and then stretching it in both the longitudinal and transverse directions. Due to the molecular orientation during stretching, this film has good physical stability, mechanical strength, airtightness, high transparency and gloss, and is tough and wear-resistant, making it a widely used printing film.

[0003] Existing BOPP films have certain defects. For example, they are prone to friction with other objects during use, which easily causes damage to the surface of the BOPP film. In addition, the efficiency of antistatic agents is usually affected by humidity. The antistatic effect decreases in a low-humidity environment and is prone to decomposition under high-temperature conditions, resulting in poor antistatic and wear-resistant performance. Summary of the Invention

[0004] The purpose of the present invention is to provide an antistatic and wear-resistant BOPP functional film. The technical problem solved by the present invention is the poor antistatic and wear-resistant performance of the BOPP functional film.

[0005] The purpose of the present invention can be achieved by the following technical solutions: An antistatic and wear-resistant BOPP functional film is directly co-extruded by biaxial stretching of an upper surface layer, a core layer, and a lower surface layer; Among them, both the upper surface layer and the lower surface layer are antistatic wear-resistant layers; the antistatic wear-resistant layer includes the following raw materials in parts by weight: 10-20 parts of an antistatic wear-resistant material and 100-120 parts of homopolypropylene; The preparation process of the antistatic wear-resistant material includes the following steps: Step 1: The polyether ester amide and the organosilicon compound containing epoxy groups at both ends undergo a ring-opening reaction in a molar ratio of 1:1 to obtain an organosilicon-modified polyether ester amide; Step 2: The organosilicon-modified polyether ester amide and erucamide undergo a ring-opening reaction in a molar ratio of 1:1 to obtain the antistatic wear-resistant material.

[0006] As a further scheme of the present invention: In Step 1, under nitrogen protection, the polyether ester amide, the organosilicon compound containing epoxy groups at both ends, and dimethyl sulfoxide are added to a container, the temperature is controlled at 50-60°C, stirred and reacted for 10 min, then potassium hydroxide is added, and then the temperature is raised to 137-155°C, the stirring speed is 120-150 r / min, and the reflux reaction is carried out for 3-5 h to obtain the organosilicon-modified polyether ester amide.

[0007] As a further solution of the present invention: the dosage ratio of polyether ester amide, organosilicon compound with epoxy groups at both ends, dimethyl sulfoxide and potassium hydroxide is 1 mol: 1 mol: 6 - 8 L: 8 - 20 g.

[0008] As a further solution of the present invention: in step 2, the organosilicon-modified polyether ester amide, erucamide and acetone solution are rapidly stirred, sodium methoxide catalyst is added, and the pH of the system is adjusted to 10 - 11 with 25% sodium hydroxide solution by mass fraction, the temperature of the system is raised to 80 - 85 °C, and the reaction time is 4 - 5 hours to obtain the antistatic and wear-resistant material.

[0009] As a further solution of the present invention: the dosage ratio of organosilicon-modified polyether ester amide, erucamide, acetone and sodium methoxide is 1 mol: 1 mol: 6 - 10 L: 15 - 28 g.

[0010] As a further solution of the present invention: the core layer is homopolypropylene.

[0011] As a further solution of the present invention: the preparation steps of the organosilicon compound with epoxy groups at both ends are as follows: A dichloromethane solution of 10% m-chloroperbenzoic acid by mass fraction is dropped into the unsaturated siloxane, and the reaction is carried out at 45 - 55 °C for 46 - 48 h to obtain the organosilicon compound with epoxy groups at both ends.

[0012] As a further solution of the present invention: the molar ratio of m-chloroperbenzoic acid to unsaturated siloxane is 1:3 - 6.

[0013] As a further solution of the present invention: the preparation steps of the unsaturated siloxane are as follows: In a nitrogen environment, 3-butenol and isopropyl titanate are dissolved in toluene, and then stirred and refluxed at 105 - 115 °C for 0.5 - 1.5 h; then dimethylsilanediol is added to the reaction system and refluxed for reaction for 18 - 26 h; the unsaturated siloxane is obtained.

[0014] As a further solution of the present invention: the dosage ratio of 3-butenol, dimethylsilanediol, isopropyl titanate and toluene is 8 mol: 0.01 mol: 0.001 - 0.004 mol: 100 - 300 mL.

[0015] The beneficial effects of the present invention: In the present invention, the hydroxyl group of polyether ester amide undergoes a ring-opening reaction with the epoxy group at one end of the organosilicon compound to obtain organosilicon-modified polyether ester amide. Then, the epoxy group at the remaining end of the organosilicon-modified polyether ester amide undergoes a ring-opening reaction with erucamide to obtain an antistatic and wear-resistant material. A specific analysis of the antistatic and wear-resistant material is as follows: It contains polyether ester amide. The antistatic agent of polyether ester amide mainly achieves the antistatic effect through the polyether soft segment and polyamide hard segment in its molecular structure, conducts electricity through the free ions in the ether bond, and is less affected by the humidity of the external environment. Erucamide forms a monomolecular lubricating layer on the film surface through molecular migration, reduces the friction coefficient, plays a role in lubrication and anti-fouling, and increases the wear resistance of the BOPP film. Among them, when polyether ester amide and erucamide are applied to the BOPP film, they both have the problem of poor thermal stability. Specifically, polyether ester amide has poor thermal stability and is prone to decomposition and yellowing at high temperatures. Erucamide has poor thermal stability and is prone to precipitation at high temperatures, resulting in an increase in the haze of the BOPP film. By using an organosilicon compound with epoxy groups at both ends as a heat stabilizer to connect these two structures of polyether ester amide and erucamide, the thermal stability of the antistatic and wear-resistant material structure itself can be effectively improved. At the same time, as an auxiliary material, it can also effectively improve the thermal stability of the BOPP film. The organosilicon compound can also be used as an antioxidant to solve the problem that the antistatic property of the BOPP film decreases due to the degradation of the PEBA segment after long-term outdoor use, and the problem that the wear resistance of the BOPP film decreases due to the easy volatilization or oxidation of erucamide molecules after migrating to the surface.

[0016] In addition, the synergy between polyether ester amide (PEBA) and erucamide in the polymer matrix is mainly reflected in the following aspects: Balance of dynamic lubrication and mechanical properties: Role of erucamide: As a surface lubricant, erucamide migrates to the material surface, significantly reducing the friction coefficient and improving the anti-blocking property and processing fluidity of the material. Role of polyether ester amide: As an elastomer, polyether ester amide enhances the toughness and impact resistance of the material through the microphase separation structure of its polyether soft segment and polyamide hard segment.

[0017] Synergistic effect: The combination of the two can effectively achieve the unity of low friction and high toughness of the BOPP film.

[0018] Optimization of processing performance: Melt rheology regulation: Erucamide acts as an internal lubricant to reduce the melt viscosity, while the introduction of polyether ester amide can adjust the melt elasticity to avoid extrusion defects such as sharkskin. In screw extrusion, the synergistic effect of the two can broaden the processing temperature window and reduce the risk of thermal degradation.

[0019] Surface properties and long-term stability: Formation of surface lubricating layer: Erucamide migrates rapidly to form a lubricating layer. The polar segments (such as amide groups) of polyether ester amide anchor erucamide molecules through hydrogen bonding, reducing their volatilization or oxidation loss. Improvement of wear resistance: The hard segments (polyamide) of polyether ester amide form micro-region reinforcement phases on the surface, cooperating with the lubricating effect of erucamide to improve the wear resistance of the material.

[0020] Therefore, the antistatic and wear-resistant material prepared by connecting polyether ester amide and erucamide through organosilicon compounds is added to the BOPP film, making the BOPP film have the advantages of long-term antistatic, wear-resistant and thermal stability at the same time. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of an antistatic and wear-resistant BOPP functional film provided in Embodiment 1 of the present invention; Among them, 1 is the upper surface layer; 2 is the core layer; 3 is the lower surface layer. Detailed Embodiments

[0023] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0024] As Figure 1 shown, Embodiment 1 of the present invention provides an antistatic and wear-resistant BOPP functional film, which is directly co-extruded by biaxial stretching from the upper surface layer 1, the core layer 2, and the lower surface layer 3; Among them, both the upper surface layer 1 and the lower surface layer 3 are antistatic and wear-resistant layers; the antistatic and wear-resistant layer includes the following raw materials in parts by weight: 10 parts of antistatic and wear-resistant material and 100 parts of homopolypropylene; The core layer 2 is homopolypropylene; The thickness ratio of the upper surface layer 1, the core layer 2, and the lower surface layer 3 is 10:80:10; More specifically, the preparation process of the antistatic and wear-resistant material includes the following steps: Step 1: The polyether ester amide and the organosilicon compound with epoxy groups at both ends undergo a ring-opening reaction in a molar ratio of 1:1 to obtain an organosilicon-modified polyether ester amide. Step 1 in more detail: Under nitrogen protection, the polyether ester amide, the organosilicon compound with epoxy groups at both ends, and dimethyl sulfoxide are added to a container. The temperature is controlled at 50 °C, and the mixture is stirred and reacted for 10 min. Then potassium hydroxide is added, and the temperature is raised to 137 °C. The stirring speed is 120 r / min, and the reflux reaction is carried out for 3 h. After the reaction is completed, filtration is carried out. Deionized water is added to the filtrate for washing, and then extraction is carried out with a toluene / acetone mixed solvent with a volume ratio of 1:1. Rotary evaporation is carried out to obtain an organosilicon-modified polyether ester amide. Among them, the dosage ratio of the polyether ester amide, the organosilicon compound with epoxy groups at both ends, dimethyl sulfoxide, and potassium hydroxide is 1 mol: 1 mol: 6 L: 8 g. Step 2: The organosilicon-modified polyether ester amide and erucamide undergo a ring-opening reaction in a molar ratio of 1:1 to obtain an antistatic and wear-resistant material. Step 2 in more detail: The organosilicon-modified polyether ester amide, erucamide, and acetone solution are rapidly stirred. Sodium methoxide catalyst is added, and the pH of the system is adjusted to 10 with a 25% sodium hydroxide solution by mass fraction. The temperature of the system is raised to 80 °C, and the reaction time is 4 h. Acetone is removed by vacuum distillation to obtain an antistatic and wear-resistant material. Among them, the dosage ratio of the organosilicon-modified polyether ester amide, erucamide, acetone, and sodium methoxide is 1 mol: 1 mol: 6 L: 15 g. The preparation steps of the organosilicon compound with epoxy groups at both ends are as follows: In a nitrogen environment, 3-butenol and isopropyl titanate are dissolved in toluene, and then stirred and refluxed at 105 °C for 0.5 h. Then dimethylsilanediol is added to the reaction system and refluxed for reaction for 18 - 26 h. After the reaction is completed, pickling is carried out twice (using 5 wt% 2,3-dihydroxybutanedioic acid) and alkali washing is carried out three times (using 5 wt% NaHCO₃). Then the oil and water phases are separated using a separatory funnel, dried, filtered, and the solvent is removed by vacuum distillation to obtain an unsaturated siloxane. A dichloromethane solution of 10% m-chloroperbenzoic acid by mass fraction is added dropwise to the unsaturated siloxane, and the reaction is carried out at 45 °C for 46 h. After the reaction is completed, pickling is carried out twice (using 5 wt% 2,3-dihydroxybutanedioic acid) and alkali washing is carried out three times (using 5 wt% NaHCO₃). Then the oil and water phases are separated using a separatory funnel, dried, filtered, and the solvent is removed by vacuum distillation to obtain an organosilicon compound with epoxy groups at both ends. Among them, the dosage ratio of 3-butenol, dimethylsilanediol, isopropyl titanate to toluene is 8 mol: 0.01 mol: 0.001 mol: 100 mL; The molar ratio of meta-chloroperoxybenzoic acid to unsaturated siloxane is 1:3.

[0025] A preparation process of an antistatic and wear-resistant BOPP functional film includes the following steps: Add the core layer raw material homopolypropylene into the main extruder to be heated to a molten state, and after filtration, it is used as the main extruded melt of the core layer 2; add the raw materials of the upper surface layer 1 and the lower surface layer 3 into two auxiliary extruders respectively, melt and filter them to obtain the melts for the upper and lower surface layers; the above melts converge and are extruded into a film sheet in a three-layer structure die head, and the convergence extrusion temperature is 230 °C; and it is quickly attached to the surface of the chill roll to form a solid sheet, and the solid sheet is biaxially stretched to obtain an antistatic and wear-resistant BOPP functional film. Examples

[0026] As Figure 1 shown, Example 2 of the present invention provides an antistatic and wear-resistant BOPP functional film, which is directly co-extruded and biaxially stretched from the upper surface layer 1, the core layer 2, and the lower surface layer 3; Among them, both the upper surface layer 1 and the lower surface layer 3 are antistatic wear-resistant layers; the antistatic wear-resistant layer includes the following raw materials in parts by weight: 15 parts of antistatic wear-resistant material and 115 parts of homopolypropylene; The core layer 2 is homopolypropylene; The thickness ratio of the upper surface layer 1, the core layer 2, and the lower surface layer 3 is 13:90:13; More specifically, the preparation process of the antistatic wear-resistant material includes the following steps: Step 1: The polyether ester amide and the organosilicon compound containing epoxy groups at both ends undergo a ring-opening reaction in a molar ratio of 1:1 to obtain an organosilicon-modified polyether ester amide; Step 1 in more detail: Under nitrogen protection, add the polyether ester amide, the organosilicon compound containing epoxy groups at both ends, and dimethyl sulfoxide into a container, control the temperature at 55 °C, stir and react for 10 min, then add potassium hydroxide, and then raise the temperature to 145 °C, the stirring speed is 130 r / min, reflux and react for 4 h. After the reaction is completed, filter, add deionized water to wash the filtrate, and then extract with a toluene / acetone mixed solvent with a volume ratio of 1:1, and rotary evaporate to obtain an organosilicon-modified polyether ester amide; Among them, the dosage ratio of the polyether ester amide, the organosilicon compound containing epoxy groups at both ends, dimethyl sulfoxide, and potassium hydroxide is 1 mol: 1 mol: 7 L: 16 g; Step 2: The organosilicon-modified polyether ester amide and erucamide undergo a ring-opening reaction in a molar ratio of 1:1 to obtain an antistatic wear-resistant material; Step 2 More specifically, the organosilicon-modified polyether ester amide, erucamide and acetone solution are rapidly stirred, a sodium methoxide catalyst is added, and the pH of the system is adjusted to 10 with a 25% sodium hydroxide solution by mass fraction. The temperature of the system is raised to 83 °C, the reaction time is 4.5 hours, and acetone is removed by vacuum distillation to obtain an antistatic and wear-resistant material; Among them, the dosage ratio of the organosilicon-modified polyether ester amide, erucamide, acetone and sodium methoxide is 1 mol: 1 mol: 8 L: 20 g; The preparation steps of the organosilicon compound with epoxy groups at both ends are as follows: Under a nitrogen atmosphere, 3-butenol and isopropyl titanate are dissolved in toluene, and then stirred and refluxed at 110 °C for 1 h; then dimethylsilanediol is added to the reaction system and refluxed for reaction for 18 - 26 h. After the reaction is completed, pickling is carried out twice (using 5 wt% 2,3-dihydroxybutanedioic acid) and alkali washing is carried out three times (using 5 wt% NaHCO₃), and then the oil and water phases are separated by a separating funnel, dried, filtered, and the solvent is removed by vacuum distillation to obtain unsaturated siloxane; A dichloromethane solution of 10% m-chloroperbenzoic acid by mass fraction is dropped into the unsaturated siloxane, and the reaction is carried out at 50 °C for 47 h. After the reaction is completed, pickling is carried out twice (using 5 wt% 2,3-dihydroxybutanedioic acid) and alkali washing is carried out three times (using 5 wt% NaHCO₃), and then the oil and water phases are separated by a separating funnel, dried, filtered, and the solvent is removed by vacuum distillation to obtain an organosilicon compound with epoxy groups at both ends; Among them, the dosage ratio of 3-butenol, dimethylsilanediol, isopropyl titanate and toluene is 8 mol: 0.01 mol: 0.003 mol: 200 mL; The molar ratio of m-chloroperbenzoic acid to unsaturated siloxane is 1:4.

[0027] A preparation process of an antistatic and wear-resistant BOPP functional film includes the following steps: The core layer raw material homopolypropylene is added to the main extruder and heated to a molten state, and after filtration, it is used as the main extruded melt of core layer 2; the raw materials of the upper surface layer 1 and the lower surface layer 3 are respectively added to two auxiliary extruders, melted and filtered to obtain the melts for the upper and lower surface layers; the above melts are combined and extruded into a film sheet in a three-layer structure die head, the combined extrusion temperature is 235 °C, and it is quickly attached to the surface of the chill roll to form a solid sheet, and the solid sheet is biaxially stretched to obtain an antistatic and wear-resistant BOPP functional film. Example

[0028] As Figure 1As shown in the figure, Embodiment 3 of the present invention provides an antistatic and wear-resistant BOPP functional film, which is directly co-extruded by biaxial stretching of an upper surface layer 1, a core layer 2, and a lower surface layer 3; Among them, both the upper surface layer 1 and the lower surface layer 3 are antistatic wear-resistant layers; the antistatic wear-resistant layer comprises the following raw materials in parts by weight: 20 parts of an antistatic wear-resistant material and 120 parts of homopolypropylene; The core layer 2 is homopolypropylene; The thickness ratio of the upper surface layer 1, the core layer 2, and the lower surface layer 3 is 16:100:16; More specifically, the preparation process of the antistatic wear-resistant material comprises the following steps: Step 1: The polyether ester amide and the organosilicon compound containing epoxy groups at both ends undergo a ring-opening reaction in a molar ratio of 1:1 to obtain an organosilicon-modified polyether ester amide; Step 1 in more detail: Under nitrogen protection, the polyether ester amide, the organosilicon compound containing epoxy groups at both ends, and dimethyl sulfoxide are added to a container, the temperature is controlled at 60°C, stirred for 10 min, then potassium hydroxide is added, and then the temperature is raised to 155°C, the stirring speed is 150 r / min, refluxed for 5 h, after the reaction is completed, filtered, deionized water is added to the filtrate for washing, and then extracted with a toluene / acetone mixed solvent with a volume ratio of 1:1, and rotary evaporation is carried out to obtain an organosilicon-modified polyether ester amide; Among them, the dosage ratio of the polyether ester amide, the organosilicon compound containing epoxy groups at both ends, dimethyl sulfoxide, and potassium hydroxide is 1 mol:1 mol:8 L:20 g; Step 2: The organosilicon-modified polyether ester amide and erucamide undergo a ring-opening reaction in a molar ratio of 1:1 to obtain an antistatic wear-resistant material; Step 2 in more detail: The organosilicon-modified polyether ester amide, erucamide, and acetone solution are rapidly stirred, sodium methoxide catalyst is added, and the pH of the system is adjusted to 11 with a 25% sodium hydroxide solution by mass, the temperature of the system is raised to 85°C, the reaction time is 5 h, and acetone is removed by vacuum distillation to obtain an antistatic wear-resistant material; Among them, the dosage ratio of the organosilicon-modified polyether ester amide, erucamide, acetone, and sodium methoxide is 1 mol:1 mol:10 L:28 g; The preparation steps of the organosilicon compound containing epoxy groups at both ends are as follows: Under a nitrogen atmosphere, 3-butenol and isopropyl titanate were dissolved in toluene, and then stirred and refluxed at 115 °C for 1.5 h; then dimethylsilanediol was added to the reaction system and refluxed for reaction for 18 - 26 h. After the reaction, pickling was carried out twice (using 5 wt% of 2,3-dihydroxybutanedioic acid) and alkali washing was carried out three times (using 5 wt% of NaHCO₃), and then the oil and water phases were separated using a separatory funnel, dried, filtered, and the solvent was removed by distillation under reduced pressure to obtain unsaturated siloxane; A dichloromethane solution of m-chloroperoxybenzoic acid with a mass fraction of 10% was added dropwise to the unsaturated siloxane, and the reaction was carried out at 55 °C for 48 h. After the reaction, pickling was carried out twice (using 5 wt% of 2,3-dihydroxybutanedioic acid) and alkali washing was carried out three times (using 5 wt% of NaHCO₃), and then the oil and water phases were separated using a separatory funnel, dried, filtered, and the solvent was removed by distillation under reduced pressure to obtain an organosilicon compound with epoxy groups at both ends; Among them, the dosage ratio of 3-butenol, dimethylsilanediol, isopropyl titanate to toluene is 8 mol: 0.01 mol: 0.004 mol: 300 mL; The molar ratio of m-chloroperoxybenzoic acid to unsaturated siloxane is 1:6.

[0029] A preparation process of an antistatic and wear-resistant BOPP functional film includes the following steps: The core layer raw material, homopolypropylene, was added to the main extruder and heated to a molten state, and after filtration, it was used as the main extruded melt of core layer 2; the raw materials of upper surface layer 1 and lower surface layer 3 were respectively added to two auxiliary extruders, melted and filtered to obtain the melts for the upper and lower surface layers; the above melts were combined and extruded into a film sheet in a three-layer structure die head, and the combined extrusion temperature was 240 °C, and it was quickly attached to the surface of a chill roll to form a solid sheet, and the solid sheet was biaxially stretched to obtain an antistatic and wear-resistant BOPP functional film.

[0030] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that no antistatic and wear-resistant material is added; The BOPP functional film of Comparative Example 1 was directly co-extruded and biaxially stretched from the upper surface layer, core layer, and lower surface layer; Among them, both the upper surface layer and the lower surface layer are homopolypropylene; The core layer is homopolypropylene; The thickness ratio of the upper surface layer, core layer, and lower surface layer is 10:80:10.

[0031] Performance test: The BOPP films obtained in Examples 1-3 and Comparative Example 1 were tested for antistatic and wear-resistant properties. The test standard for antistatic properties: ASTM D257 (surface resistivity test), test conditions: temperature 25°C, humidity 50% RH; the test standard for wear-resistant properties: ASTM D1894 (dynamic friction coefficient), test conditions: stainless steel plate against the film surface, speed 100 mm / min; In addition, after heating the BOPP film at 120°C for 1 h, the antistatic and wear-resistant properties were tested, and the surface resistance change rate and dynamic friction coefficient change rate were calculated.

[0032] Surface resistivity (Ω / sq) Coefficient of kinetic friction (μ) Rate of change of surface resistance (%) Rate of change of coefficient of kinetic friction (%) Example 1 <![CDATA[1.2*10 10 > 0.19 26.3% 34.6% Example 2 <![CDATA[8.9*10 9 > 0.18 23.6% 33.1% Example 3 <![CDATA[7.2*10 9 > 0.16 20.9% 31.8% Comparative Example 1 <![CDATA[3.1*10 10 > 0.38 41% 43.1% The BOPP films prepared in Examples 1-3 of the present invention by adding an antistatic and wear-resistant material prepared by connecting polyether ester amide and erucic acid amide through a silicone compound have good antistatic and wear-resistant properties; and also have good thermal stability for antistatic and wear-resistant properties.

[0033] The above has described in detail one embodiment of the present invention, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. An antistatic and wear-resistant BOPP functional film, characterized in that: It is made by direct co-extrusion of the upper surface layer, core layer and lower surface layer through biaxial stretching; Wherein, the upper surface layer and the lower surface layer are both antistatic wear-resistant layers; the antistatic wear-resistant layer comprises the following raw materials by weight: 10-20 parts of antistatic wear-resistant material and 100-120 parts of homopolymer polypropylene; The preparation process of the antistatic wear-resistant material comprises the following steps: Step 1: polyether ester amide and an organosilicon compound containing epoxy groups at both ends undergo a ring-opening reaction at a molar ratio of 1:1 to obtain an organosilicon-modified polyether ester amide; Step 2: The organosilicon-modified polyetheresteramide and erucic acid amide undergo a ring-opening reaction at a molar ratio of 1:1 to obtain an antistatic wear-resistant material.

2. The antistatic and wear-resistant BOPP functional film according to claim 1, characterized in that: In step 1, under nitrogen protection, polyether ester amide, a double-end epoxy group-containing organosilicon compound and dimethyl sulfoxide are added to a container, the temperature is controlled at 50-60°C, the reaction is stirred for 10 minutes, and then potassium hydroxide is added. The temperature is then raised to 137-155°C, the stirring speed is 120-150r / min, and the reaction is refluxed for 3-5h to obtain organosilicon-modified polyether ester amide.

3. The antistatic and wear-resistant BOPP functional film according to claim 2, characterized in that: The usage ratio of the polyether ester amide, the organosilicon compound containing epoxy groups at both ends, dimethyl sulfoxide and potassium hydroxide is 1 mol: 1 mol: 6-8 L: 8-20 g.

4. The antistatic and wear-resistant BOPP functional film according to claim 1, characterized in that: In step 2, the organosilicon-modified polyetheresteramide, erucic acid amide and acetone solution are quickly stirred, sodium methoxide catalyst is added, and the pH of the system is adjusted to 10-11 with 25% by mass sodium hydroxide solution, the system temperature is increased to 80-85°C, the reaction time is 4-5 hours, and an antistatic wear-resistant material is obtained.

5. The antistatic and wear-resistant BOPP functional film according to claim 4, characterized in that: The usage ratio of the organosilicon-modified polyetheresteramide, erucic acid amide, acetone and sodium methoxide is 1 mol: 1 mol: 6-10 L: 15-28 g.

6. The antistatic and wear-resistant BOPP functional film according to claim 1, characterized in that: The core layer is homopolymer polypropylene.

7. The antistatic and wear-resistant BOPP functional film according to claim 1, characterized in that: The preparation steps of the organosilicon compound containing epoxy groups at both ends are as follows: A 10% by mass solution of m-chloroperbenzoic acid in dichloromethane is added dropwise to the unsaturated siloxane, and the mixture is reacted at 45-55° C. for 46-48 hours to obtain an organosilicon compound containing epoxy groups at both ends.

8. The antistatic and wear-resistant BOPP functional film according to claim 7, characterized in that: The molar ratio of meta-chloroperbenzoic acid to unsaturated siloxane is 1:3-6.

9. The antistatic and wear-resistant BOPP functional film according to claim 1, characterized in that: The preparation steps of unsaturated siloxane are as follows: Under nitrogen environment, 3-butenol and isopropyl titanate are dissolved in toluene, and then stirred and refluxed at 105-115° C. for 0.5-1.5 h; then dimethylsilanediol is added to the reaction system and refluxed to react for 18-26 h; unsaturated siloxane is obtained.

10. The antistatic and wear-resistant BOPP functional film according to claim 1, characterized in that: The usage ratio of 3-butenol, dimethylsilanediol, isopropyl titanate and toluene is 8 mol: 0.01 mol: 0.001-0.004 mol: 100-300 mL.

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