An antistatic and wear-resistant BOPP functional film

Abstract

The present invention relates to the technical field of BOPP films, and particularly relates to an antistatic and wear-resistant BOPP functional film, which is directly co-extruded by biaxial stretching of an upper surface layer, a core layer, and a lower surface layer; wherein, both the upper surface layer and the lower surface layer are antistatic and wear-resistant layers; the preparation process of the antistatic and wear-resistant material includes the following steps: a polyether ester amide and an 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; 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; the antistatic and wear-resistant material prepared by connecting the polyether ester amide and erucamide through an organosilicon compound in the present invention is added to the BOPP film, so that the BOPP film has the advantages of long-term 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 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 can easily cause 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 through the following technical solutions:

[0006] An antistatic and wear-resistant BOPP functional film is directly co-extruded by biaxial stretching from an upper surface layer, a core layer, and a lower surface layer;

[0007] 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;

[0008] The preparation process of the antistatic wear-resistant material includes the following steps:

[0009] Step 1: A ring-opening reaction occurs between polyether ester amide and an organosilicon compound with epoxy groups at both ends in a molar ratio of 1:1 to obtain organosilicon-modified polyether ester amide;

[0010] Step 2: A ring-opening reaction occurs between the organosilicon-modified polyether ester amide and erucamide in a molar ratio of 1:1 to obtain the antistatic wear-resistant material.

[0011] As a further solution of the present invention: in step 1, under nitrogen protection, polyether ester amide, an organosilicon compound with 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 refluxed and reacted for 3 - 5 h to obtain organosilicon-modified polyether ester amide.

[0012] As a further solution of the present invention: the dosage ratio of polyether ester amide, an organosilicon compound with epoxy groups at both ends, dimethyl sulfoxide, and potassium hydroxide is 1 mol : 1 mol : 6 - 8 L : 8 - 20 g.

[0013] 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 a 25% sodium hydroxide solution by mass fraction, the system temperature is raised to 80 - 85 °C, and the reaction time is 4 - 5 hours to obtain an antistatic wear-resistant material.

[0014] 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.

[0015] As a further solution of the present invention: the core layer is homopolypropylene.

[0016] As a further solution of the present invention: the preparation steps of the organosilicon compound with epoxy groups at both ends are as follows:

[0017] A dichloromethane solution of m-chloroperbenzoic acid with a mass fraction of 10% is dropped into unsaturated siloxane, and reacted at 45 - 55 °C for 46 - 48 h to obtain an organosilicon compound with epoxy groups at both ends.

[0018] As a further solution of the present invention: the molar ratio of m-chloroperbenzoic acid to unsaturated siloxane is 1:3 - 6.

[0019] As a further solution of the present invention: the preparation steps of unsaturated siloxane are as follows:

[0020] Under a nitrogen atmosphere, 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; to obtain unsaturated siloxane.

[0021] 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.

[0022] Beneficial effects of the present invention:

[0023] In the present invention, an epoxy group at one end of an organosilicon compound reacts with a hydroxyl group of polyether ester amide to obtain organosilicon-modified polyether ester amide. Then, an epoxy group at the remaining end of the organosilicon-modified polyether ester amide reacts 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 realizes 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 migrates to the film surface through molecular migration to form a monomolecular lubricating layer, reducing the friction coefficient, playing a role in lubrication and anti-fouling, and increasing 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, the polyether ester amide has poor thermal stability and is prone to decomposition at high temperatures, resulting in yellowing. Erucamide has poor thermal stability and is prone to precipitation at high temperatures, leading to 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.

[0024] In addition, the synergy between polyether ester amide (PEBA) and erucamide in the polymer matrix is mainly reflected in the following aspects:

[0025] Balance between dynamic lubrication and mechanical properties: The 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. The 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.

[0026] Synergistic effect: The combination of the two can effectively achieve the unity of low friction and high toughness of the BOPP film.

[0027] Processing performance optimization: Melt rheology regulation: Erucamide acts as an internal lubricant to reduce the melt viscosity, and the introduction of polyether ester amide can adjust the melt elasticity to avoid extrusion defects such as shark skin. In screw extrusion, the synergistic effect of the two can broaden the processing temperature window and reduce the risk of thermal degradation.

[0028] Surface characteristics and long-term stability: Formation of surface lubricating layer: Erucamide migrates rapidly to form a lubricating layer, and 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 microzone reinforcement phases on the surface, cooperating with the lubricating effect of erucamide to improve the wear resistance of the material.

[0029] Therefore, an antistatic and wear-resistant material prepared by connecting polyether ester amide and erucamide through a silicone compound is added to the BOPP film, enabling the BOPP film to have the advantages of long-term antistatic, wear resistance, and thermal stability simultaneously. Brief Description of the Drawings

[0030] 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 also be obtained based on these drawings.

[0031] 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;

[0032] Among them, 1, upper surface layer; 2, core layer; 3, lower surface layer. Detailed Embodiments

[0033] 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 some embodiments of the present invention, rather than all 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

[0034] 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 an upper surface layer 1, a core layer 2, and a lower surface layer 3;

[0035] Among them, the upper surface layer 1 and the lower surface layer 3 are both antistatic wear-resistant layers; the antistatic wear-resistant layer comprises the following raw materials in parts by weight: 10 parts of antistatic wear-resistant material and 100 parts of homopolypropylene;

[0036] The core layer 2 is homopolypropylene;

[0037] The thickness ratio of the upper surface layer 1, the core layer 2, and the lower surface layer 3 is 10:80:10;

[0038] More specifically, the preparation process of the antistatic wear-resistant material comprises the following steps:

[0039] 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;

[0040] 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 then 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, and rotary evaporation is carried out to obtain the organosilicon-modified polyether ester amide;

[0041] 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;

[0042] 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;

[0043] 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, the reaction time is 4 h, and acetone is removed by vacuum distillation to obtain the antistatic wear-resistant material;

[0044] 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;

[0045] The preparation steps of the organosilicon compound with epoxy groups at both ends are as follows:

[0046] Under a nitrogen atmosphere, 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% of 2,3-dihydroxybutanedioic acid) and alkali washing is carried out three times (using 5 wt% of NaHCO₃), and then the oil and water phases are separated using a separating funnel, dried, filtered, and the solvent is removed by distillation under reduced pressure to obtain unsaturated siloxane;

[0047] A dichloromethane solution of m-chloroperbenzoic acid with a mass fraction of 10% 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% of 2,3-dihydroxybutanedioic acid) and alkali washing is carried out three times (using 5 wt% of NaHCO₃), and then the oil and water phases are separated using a separating funnel, dried, filtered, and the solvent is removed by distillation under reduced pressure to obtain an organosilicon compound with epoxy groups at both ends;

[0048] Among them, the dosage ratio of 3-butenol, dimethylsilanediol, isopropyl titanate to toluene is 8 mol: 0.01 mol: 0.001 mol: 100 mL;

[0049] The molar ratio of m-chloroperbenzoic acid to unsaturated siloxane is 1:3.

[0050] A preparation process of an antistatic and wear-resistant BOPP functional film includes the following steps:

[0051] 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 the 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, and the combined 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. Example

[0052] 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;

[0053] 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: 15 parts of an antistatic and wear-resistant material and 115 parts of homopolypropylene;

[0054] The core layer 2 is homopolypropylene;

[0055] The thickness ratio of the upper surface layer 1, the core layer 2, and the lower surface layer 3 is 13:90:13;

[0056] More specifically, the preparation process of the antistatic wear-resistant material includes the following steps:

[0057] 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;

[0058] 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 55 °C, and the mixture is stirred and reacted for 10 min. Then potassium hydroxide is added, and the temperature is raised to 145 °C, the stirring speed is 130 r / min, and the mixture is refluxed and reacted for 4 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, and rotary evaporation is carried out to obtain an organosilicon-modified polyether ester amide;

[0059] 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:7 L:16 g;

[0060] 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;

[0061] 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 system temperature is raised to 83 °C, the reaction time is 4.5 hours, and acetone is removed by vacuum distillation to obtain an antistatic wear-resistant material;

[0062] 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;

[0063] The preparation steps of the organosilicon compound with epoxy groups at both ends are as follows:

[0064] 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 separatory funnel, dried, filtered, and the solvent is removed by vacuum distillation to obtain unsaturated siloxane;

[0065] A dichloromethane solution of m-chloroperbenzoic acid with a mass fraction of 10% was added dropwise to the unsaturated siloxane, and the reaction was carried out at 50 °C for 47 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 separating funnel, dried, filtered, and the solvent was removed by vacuum distillation to obtain an organosilicon compound with epoxy groups at both ends;

[0066] Among them, the dosage ratio of 3-butenol, dimethylsilanediol, isopropyl titanate and toluene is 8 mol: 0.01 mol: 0.003 mol: 200 mL;

[0067] The molar ratio of m-chloroperbenzoic acid to the unsaturated siloxane is 1:4.

[0068] A preparation process of an antistatic and wear-resistant BOPP functional film includes the following steps:

[0069] 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 the core layer 2; the raw materials of the upper surface layer 1 and the 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 converged and extruded into a film sheet in a three-layer structure die head, the converging extrusion temperature was 235 °C, and it was quickly attached to the surface of the chill roll to form a solid sheet, and the solid sheet was biaxially stretched to obtain an antistatic and wear-resistant BOPP functional film. Example

[0070] As Figure 1 shown, Example 3 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;

[0071] 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: 20 parts of an antistatic and wear-resistant material and 120 parts of homopolypropylene;

[0072] The core layer 2 is homopolypropylene;

[0073] The thickness ratio of the upper surface layer 1, the core layer 2, and the lower surface layer 3 is 16:100:16;

[0074] More specifically, the preparation process of the antistatic and wear-resistant material includes the following steps:

[0075] 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;

[0076] Step 1 More specifically: Under nitrogen protection, polyether ester amide, an organosilicon compound with epoxy groups at both ends, and dimethyl sulfoxide are added to a container. The temperature is controlled at 60 °C, and the mixture is stirred and reacted for 10 min. Then potassium hydroxide is added, and the temperature is raised to 155 °C. The stirring speed is 150 r / min, and the reflux reaction is carried out for 5 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 organosilicon-modified polyether ester amide;

[0077] Among them, the dosage ratio of polyether ester amide, the organosilicon compound with epoxy groups at both ends, dimethyl sulfoxide, and potassium hydroxide is 1 mol: 1 mol: 8 L: 20 g;

[0078] 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;

[0079] Step 2 More specifically, 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 fraction. The temperature of the system is raised to 85 °C, and the reaction time is 5 h. Acetone is removed by vacuum distillation to obtain an antistatic and wear-resistant material;

[0080] 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;

[0081] The preparation steps of the organosilicon compound with epoxy groups at both ends are as follows:

[0082] In a nitrogen environment, 3-butenol and isopropyl titanate are dissolved in toluene, and then stirred and refluxed at 115 °C for 1.5 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 by a separating funnel, dried, filtered, and the solvent is removed by vacuum distillation to obtain unsaturated siloxane;

[0083] A dichloromethane solution of 10% m-chloroperoxybenzoic acid by mass fraction is added dropwise to the unsaturated siloxane, and the reaction is carried out at 55 °C for 48 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 by a separating funnel, dried, filtered, and the solvent is removed by vacuum distillation to obtain the organosilicon compound with epoxy groups at both ends;

[0084] Among them, the dosage ratio of 3-butenol, dimethylsilanediol, isopropyl titanate and toluene is 8 mol: 0.01 mol: 0.004 mol: 300 mL;

[0085] The molar ratio of meta-chloroperbenzoic acid to unsaturated siloxane is 1:6.

[0086] A preparation process of an antistatic and wear-resistant BOPP functional film includes the following steps:

[0087] Add the core layer raw material homopolypropylene to the main extruder and heat it to a molten state, and after filtration, use it as the main extruded melt of core layer 2; add the raw materials of the upper surface layer 1 and the lower surface layer 3 to two auxiliary extruders respectively, melt and filter them to obtain the melts for the upper and lower surface layers; the above melts converge and extrude into a film sheet in a three-layer structure die head, the convergence extrusion temperature is 240 °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.

[0088] Comparative Example 1

[0089] The difference between Comparative Example 1 and Example 1 is that no antistatic and wear-resistant material is added;

[0090] The BOPP functional film of Comparative Example 1 is directly co-extruded and biaxially stretched from the upper surface layer, the core layer and the lower surface layer;

[0091] Among them, both the upper surface layer and the lower surface layer are homopolypropylene;

[0092] The core layer is homopolypropylene;

[0093] The thickness ratio of the upper surface layer, the core layer and the lower surface layer is 10:80:10.

[0094] Performance test:

[0095] Perform antistatic and wear-resistant performance tests on the BOPP films obtained in Examples 1-3 and Comparative Example 1. The test standard for antistatic performance: ASTM D257 (surface resistivity test), test conditions: temperature 25 °C, humidity 50% RH; the test standard for wear-resistant performance: ASTM D1894 (dynamic friction coefficient), test conditions: stainless steel plate against the film surface, speed 100 mm / min;

[0096] In addition, after heating the BOPP film at 120 °C for 1 h, perform antistatic and wear-resistant performance tests, and calculate the surface resistance change rate and the dynamic friction coefficient change rate.

[0097] 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%

[0098] In Examples 1-3 of the present invention, the BOPP film prepared by adding an antistatic and wear-resistant material prepared by connecting polyether ester amide and erucamide through a silicone compound has excellent antistatic and wear-resistant properties; and also has good thermal stability for antistatic and wear-resistant properties.

[0099] 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 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 directly prepared by biaxial stretching and coextrusion 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.

2. The antistatic and wear-resistant BOPP functional film according to claim 1, wherein 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.

3. The antistatic and wear-resistant BOPP functional film according to claim 2, wherein The dosage ratio of polyether ester amide, 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. An antistatic and wear-resistant BOPP functional film according to claim 1, characterized in that 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 a 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 wear-resistant material.

5. An antistatic and wear-resistant BOPP functional film according to claim 4, characterized in that, 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.

6. An antistatic and wear-resistant BOPP functional film according to claim 1, wherein The core layer is homopolypropylene.

7. An 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 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 containing epoxy groups at both ends.

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

9. An antistatic and wear-resistant BOPP functional film according to claim 8, characterized in that, The preparation steps of the unsaturated siloxane are as follows: Under a nitrogen atmosphere, 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.

10. An antistatic and wear-resistant BOPP functional film according to claim 9, characterized in that, 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.

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