High impact resistant LLDPE film composition and film material and film and preparation method and application thereof

Abstract

The present invention relates to the technical field of chemical raw material preparation, and discloses a high impact resistant LLDPE film composition and film material, as well as a film and a preparation method and application thereof. The composition contains a modified masterbatch, a second LLDPE and a second antioxidant, and the modified masterbatch contains UHMWPE, a first LLDPE, a plasticizer, a coupling agent and a first antioxidant, wherein the normalized elastic modulus G of the UHMWPE is t N ≤0.8, branching degree ≤15 carbons / 1000 carbons, viscosity average molecular weight is 1.5 million g / mol-6 million g / mol. The high impact resistant LLDPE film material has good impact resistance.

Description

Technical Field

[0001] The invention relates to the technical field of chemical raw material preparation, and in particular to a high-impact LLDPE film composition and film material, a film, and a preparation method and application thereof. Background Art

[0002] LLDPE is a common polyolefin material with high softening temperature and melting temperature, high strength, good toughness, high rigidity, good heat resistance, good cold resistance, etc. It also has good resistance to environmental stress cracking, and is resistant to acids, alkalis, organic solvents, etc., and is widely used in industries, agriculture, medicine, health and daily necessities. However, due to its higher degree of branching compared to other polyolefin materials, it is less used in film materials, especially in the preparation of high-impact LLDPE films, which is even more difficult. However, with the continuous deepening of scientific research, many European and American countries have developed special materials for high-impact LLDPE films and achieved industrial production, which are supplied to downstream film manufacturers, such as FB2310 of Borealis Chemical and 5110G of DuPont in the United States. At present, domestic LLDPE film materials cannot match the impact resistance of these imported LLDPE film materials. Once the imported materials cannot guarantee the supply to domestic LLDPE film manufacturers, the production and operation of LLDPE film manufacturers will be severely restricted.

[0003] In order to solve the material limitation problem that there is no special material for high-impact LLDPE film in China, it is of great significance to research and develop a high-impact LLDPE film material. Summary of the invention

[0004] The purpose of the present invention is to overcome the problems in the prior art that LLDPE has a high degree of branching compared to other polyolefin materials, resulting in limited application in film materials and poor impact resistance. When UHMWPE and LLDPE are mixed and granulated, they are easy to entangle, and the prepared high-impact-resistant LLDPE film material has the defect of many crystal points. A high-impact-resistant LLDPE film composition and film material, as well as a film and a preparation method and application thereof are provided. The high-impact-resistant LLDPE film material has good impact resistance.

[0005] In order to achieve the above object, the first aspect of the present invention provides a high impact resistant LLDPE film composition, wherein the composition contains a modified masterbatch, a second LLDPE and a second antioxidant, and the modified masterbatch contains UHMWPE, a first LLDPE, a plasticizer, a coupling agent and a first antioxidant, wherein the normalized elastic modulus G of the UHMWPE is t N ≤0.8, branching degree ≤15 carbons / 1000 carbons, and viscosity-average molecular weight of 1.5 million g / mol-6 million g / mol.

[0006] The second aspect of the present invention provides a method for preparing a high impact resistant LLDPE film material using the aforementioned composition, wherein the preparation method comprises:

[0007] (1) mixing UHMWPE, a first LLDPE, a plasticizer, a coupling agent and a first antioxidant to perform a first granulation to obtain a modified masterbatch;

[0008] (2) The modified masterbatch, the second LLDPE and the second antioxidant are mixed and subjected to a second granulation to obtain a high impact resistant LLDPE film material.

[0009] The third aspect of the present invention provides a high impact resistant LLDPE film material prepared by the aforementioned preparation method.

[0010] A fourth aspect of the present invention provides a high impact resistant LLDPE film prepared using the high impact resistant LLDPE film material described above.

[0011] A fifth aspect of the present invention provides a use of the aforementioned high impact resistant LLDPE film in packaging sharp objects.

[0012] Through the above technical solution, the beneficial effects of the present invention are as follows:

[0013] (1) The UHMWPE used in the high impact LLDPE film composition provided by the present invention is a low entanglement UHMWPE, whose viscosity average molecular weight is between 1.5 million g / mol and 6 million g / mol, and whose normalized elastic modulus G t N ≤0.8, branching degree ≤15 carbon / 1000 carbon. Compared with ordinary UHMWPE, it has certain fluidity and is relatively easy to process.

[0014] (2) The method for preparing a high impact resistant LLDPE film material provided by the present invention is divided into two steps. The two-stage processing technology can effectively make the low entanglement UHMWPE uniformly blended in the LLDPE, which is one of the important reasons why the obtained LLDPE film material has excellent impact resistance.

[0015] (3) The method for preparing a high impact resistant LLDPE film material provided by the present invention introduces a coupling agent of an appropriate type and proportion in one stage, so that the low entanglement UHMWPE and LLDPE form a stable and uniform cross-linked network structure in a blending process, which is also one of the important reasons why the final LLDPE film material has excellent impact resistance.

[0016] (4) The high-impact LLDPE film (cast film or blown film) prepared by using the high-impact LLDPE film material provided by the present invention has a high dart drop impact strength, which can reach more than 280g (40μm). DETAILED DESCRIPTION

[0017] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0018] As mentioned above, the first aspect of the present invention provides a high impact LLDPE film composition, wherein the composition contains a modified masterbatch, a second LLDPE and a second antioxidant, the modified masterbatch contains UHMWPE, a first LLDPE, a plasticizer, a coupling agent and a first antioxidant, wherein the normalized elastic modulus G of the UHMWPE is t N ≤0.8, branching degree ≤15 carbons / 1000 carbons, and viscosity-average molecular weight of 1.5 million g / mol-6 million g / mol.

[0019] The inventors of the present invention have found that if UHMWPE and LLDPE are mixed and granulated, they are prone to entanglement, and the prepared high-impact LLDPE film material has the defect of many crystal points; in addition, LLDPE has a higher degree of branching than HDPE, and it is not easy to form a good cross-linking system with other substances to obtain higher impact resistance. Based on this, the inventors of the present invention use the UHMWPE with specific parameter limits of the present invention to enable UHMWPE and LLDPE to form a stable cross-linking system, thereby obtaining a high-impact LLDPE film material; further, the inventors of the present invention mix and granulate the high-impact LLDPE film composition in steps, which can effectively make the low-entanglement UHMWPE uniformly blended in the LLDPE; further, in the preparation process, a coupling agent is introduced, so that in the blending process, UHMWPE and LLDPE can form a stable and uniform cross-linked network structure, and the final LLDPE film material has excellent impact resistance.

[0020] According to the present invention, the UHMWPE is a low entanglement UHMWPE, which is a special ultra-high molecular weight polyethylene. Preferably, the normalized elastic modulus G of the UHMWPE is t N≤0.7, the degree of branching ≤12 carbons / 1000 carbons, and the viscosity-average molecular weight is 1500000-3000000 g / mol; more preferably, the normalized elastic modulus G of the UHMWPE t N ≤0.6, branching degree ≤10 carbon / 1000 carbon, viscosity average molecular weight 1500000-2000000g / mol; it has the super wear resistance and self-lubricating property of ordinary UHMWPE, relatively high strength, stable chemical properties, strong anti-aging performance, etc., and is an excellent impact-resistant material. In the present invention, the above-defined UHMWPE is used to form a stable cross-linking system between UHMWPE and LLDPE, thereby obtaining a high-impact LLDPE film material.

[0021] According to a preferred embodiment of the present invention, the UHMWPE is obtained by self-preparation. Specifically, the preparation method includes:

[0022] (1) Preparation of heterogeneous catalysts

[0023] Add a porous carrier and an azobisisobutyronitrile initiator into a reaction device, and immerse at 0-30° C. for 4-10 hours; add the modified porous carrier and the polyethylene catalyst into an organic solvent, and stir for 6-12 hours to allow the polyethylene catalyst to be fully loaded into the modified porous carrier filled with a styrene-based polymer, and then wash it with an organic solvent, remove the organic solvent, and dry it to obtain the heterogeneous catalyst;

[0024] (2) Ethylene polymerization

[0025] In a gas phase polymerization reactor, add a co-catalyst, ethylene and the heterogeneous catalyst prepared in step (1), raise the temperature to -10°C to 80°C, adjust the polymerization pressure to 10-30 bar, and carry out the polymerization reaction for 1.5-5 hours.

[0026] Finally, the low entanglement UHMWPE is obtained, and its performance satisfies the normalized elastic modulus G t N ≤0.7, branching degree ≤12 carbon / 1000 carbon, viscosity average molecular weight is 1500000-3000000g / mol.

[0027] According to the present invention, LLDPE is a linear low-density polyethylene, which is a non-toxic, tasteless and odorless polymer. In the present invention, the LLDPE has a melt index of 0.5-10 g / 10 min at 2.16 kg and 190 ° C, and a density of 0.90-0.94 g / cm 3 More preferably 0.918-0.935 g / cm 3; In addition, in the present invention, the branching degree of the LLDPE is 90-230 carbons / 1000 carbons.

[0028] According to the present invention, based on the total weight of the modified masterbatch, the content of the UHMWPE does not exceed 50 weight %; preferably, the weight ratio of the content of the UHMWPE, the first LLDPE, the plasticizer, the coupling agent and the first antioxidant is (5-40): (50-80): (10-30): (0.1-2): (1-2); preferably (20-40): (50-80): (10-12): (0.4-0.5): (1-1.2).

[0029] According to the present invention, the weight ratio of the first LLDPE to the second LLDPE is (50-70):100.

[0030] According to the present invention, the weight ratio of the first antioxidant to the second antioxidant is 1:(0.5-1.5), preferably 1:(0.5-0.8).

[0031] According to the present invention, based on the total weight of the second LLDPE, the amount of the modified masterbatch is 5-20 wt%.

[0032] According to the present invention, the plasticizer is selected from one or more of PEW, EPDM and HDPE, preferably PEW; in the present invention, PEW refers to polytetrafluoroethylene modified polyethylene wax powder, EPDM refers to vulcanized ethylene propylene diene monomer rubber, and HDPE refers to high-density polyethylene. In the present invention, the use of the plasticizer specifically defined in the present invention can help plasticize the low-entanglement UHMWPE so that it can fully contact with the LLDPE.

[0033] According to the present invention, the coupling agent is an aluminate coupling agent and / or a titanate coupling agent, preferably an aluminate coupling agent and a titanate coupling agent, and the ratio of the two can be 1: (1-1.5), preferably 1: 1. In the present invention, the coupling agent is a key element in the formula of the present invention, and plays the role of a "molecular bridge" between LLDPE and low entanglement UHMWPE, making LLDPE and low entanglement UHMWPE more stable.

[0034] According to the present invention, the antioxidant is not specifically limited, as long as it is applicable to LLDPE and low entanglement UHMWPE. In the present invention, preferably, the antioxidant can be selected from one or more of antioxidant 264, antioxidant 1010, antioxidant 1024, antioxidant 1076, antioxidant B225 and antioxidant B215.

[0035] According to the present invention, the composition further contains an auxiliary agent, which may be an opening agent and / or a lubricant, wherein the opening agent is selected from one or more of oleamide, talc, diatomaceous earth and silica; the lubricant is erucamide; in the present invention, the mass fraction of the other auxiliary agents added to the second LLDPE does not exceed 2% by weight, preferably 1-2% by weight.

[0036] As mentioned above, the second aspect of the present invention provides a method for preparing a high impact resistant LLDPE film material using the aforementioned composition, wherein the preparation method comprises:

[0037] (1) mixing UHMWPE, a first LLDPE, a plasticizer, a coupling agent and a first antioxidant to perform a first granulation to obtain a modified masterbatch;

[0038] (2) The modified masterbatch, the second LLDPE and the second antioxidant are mixed and subjected to a second granulation to obtain a high impact resistant LLDPE film material.

[0039] According to the present invention, in step (1), in the one-stage granulation formula, the mass fraction of the low entanglement UHMWPE is not more than 50%, the mass fraction of the PEW is not less than 10% and not more than 30%, the mass fraction of the coupling agent is not less than 0.1% and not more than 2%, and the antioxidant is not less than 1% and not more than 2%; preferably, the weight ratio of the UHMWPE, the first LLDPE, the plasticizer, the coupling agent and the first antioxidant is (5-40): (50-80): (10-30): (0.1-2): (1-2).

[0040] According to the present invention, the weight ratio of the first LLDPE in step (1) to the second LLDPE in step (2) is (50-70):100.

[0041] According to the present invention, the weight ratio of the first antioxidant in step (1) to the second antioxidant in step (2) is 1:(0.5-1.5), preferably 1:(0.5-0.8).

[0042] According to the present invention, in step (2), other auxiliary agents may be added. In the present invention, the auxiliary agent may be an opening agent and / or a lubricant, wherein the opening agent is selected from one or more of oleamide, talcum powder, diatomaceous earth and silicon dioxide; and the lubricant is erucamide.

[0043] In the present invention, in step (2), a first-stage modified masterbatch, a second antioxidant and other additives may be added to the second LLDPE at a certain mass fraction, wherein the mass fraction of the first-stage modified masterbatch added to the LLDPE is 5-20%, preferably 8-10%.

[0044] According to the present invention, the mixing equipment is not specifically limited and can be a high-speed mixer well known to those skilled in the art. In the present invention, the high-speed mixer is a vertical high-speed mixer or a horizontal high-speed mixer.

[0045] According to the present invention, in step (1) and step (2), the components are further premixed, wherein the premixing time does not exceed 2 minutes and the temperature does not exceed 40°C.

[0046] According to the present invention, in step (1), the first granulation conditions include: a temperature of 210-260° C. and a rotation speed of 110-160 rpm.

[0047] According to the present invention, in step (2), the conditions for the second granulation include: a temperature of 160-200° C. and a rotation speed of 50-100 rpm.

[0048] According to the present invention, the first granulation and the second granulation are performed by melt extrusion granulation equipment. In the present invention, a twin-screw extruder can be used for melt extrusion granulation.

[0049] According to a preferred embodiment of the present invention, a method for preparing a high impact resistant LLDPE film material using the aforementioned composition comprises:

[0050] (1) First, low entanglement UHMWPE: first LLDPE: PEW: coupling agent: first antioxidant are premixed in the above proportions using a high-speed mixer, the speed of the mixer is 480 rpm, and the obtained premix is ​​granulated at a certain temperature and speed to obtain a modified masterbatch.

[0051] (2) adding the modified masterbatch, the second antioxidant and other additives into the second LLDPE in the above proportions, and premixing the premix with a high-speed mixer, and performing two-stage granulation on the obtained premix at a certain temperature and rotation speed to obtain a high-impact LLDPE film material.

[0052] As mentioned above, the third aspect of the present invention provides a high impact resistant LLDPE film material prepared by the aforementioned preparation method.

[0053] In the present invention, low entanglement UHMWPE, plasticizer, coupling agent and antioxidant are added to LLDPE in the above proportions through two-stage blending, so that low entanglement UHMWPE and LLDPE form a stable cross-linking system, thereby obtaining a high impact resistant LLDPE film material.

[0054] As mentioned above, the fourth aspect of the present invention provides a high impact resistant LLDPE film prepared by using the high impact resistant LLDPE film material mentioned above.

[0055] According to the present invention, a casting method can be used to prepare a cast film with a thickness of 40-80 μm, preferably 40 μm.

[0056] According to the present invention, a blown film can be prepared by a blow molding method, with a thickness of 20-55 μm, preferably 40 μm.

[0057] As mentioned above, the fifth aspect of the present invention provides a use of the aforementioned high impact resistant LLDPE film in packaging sharp objects.

[0058] The present invention will be described in detail below through examples.

[0059] In the following examples and comparative examples:

[0060] Viscosity average molecular weight The determination method is based on GB1841-1980 to determine the intrinsic viscosity [η] of polyethylene, and then according to K and α are both constants, from which the viscosity average molecular weight is calculated

[0061] The falling dart impact strength test adopts: a falling dart impact testing machine is used to test the obtained UHMWPE / LLDPE film. During the test, the test is carried out with reference to GB / T9639 "Test method for impact resistance of plastic film and sheeting - Free falling dart method" and ISO7765 "Determination of impact resistance of plastic film and sheeting - Free falling dart method".

[0062] LLDPE was purchased from Sinopec, plasticizer was purchased from Dow Chemical, coupling agent was purchased from Hangzhou Erdu Chemical Technology Co., Ltd., and antioxidant was purchased from J&K Technology Co., Ltd.

[0063] Example 1

[0064] This example is intended to illustrate the use of the composition and preparation method of the present invention to prepare a high impact resistant LLDPE film material.

[0065] (1) At 40°C, take 50kg LLDPE (density 0.918g / cm 3), 40kg low entanglement UHMWPE, of which G t N The viscosity-average molecular weight is 1.5 million g / mol, 10 kg PEW, 0.25 kg aluminate coupling agent, 0.25 kg titanate coupling agent, and 1 kg antioxidant 264 are put into a high-speed mixer, and the mixer is mixed for 2 minutes at a speed of 480 rpm. After that, a stage of granulation is carried out by melt extrusion granulation equipment at a temperature of 210 ° C and a speed of 110 rpm to obtain a stage of modified masterbatch.

[0066] (2) 8 kg of the first-stage modified masterbatch, 100 kg of LLDPE and 1.08 kg of the additional antioxidant were placed in a high-speed mixer for premixing, and the mixture was mixed at a speed of 480 rpm for 2 minutes. After that, the mixture was subjected to second-stage granulation by a melt extrusion granulation device at a temperature of 110° C. and a speed of 50 rpm, and finally a high-impact LLDPE film material S1 was obtained.

[0067] Example 2

[0068] This example is intended to illustrate the use of the composition and preparation method of the present invention to prepare a high impact resistant LLDPE film material.

[0069] (1) At 35°C, take 50kg LLDPE (density 0.925g / cm 3 ), 40kg low entanglement UHMWPE, of which G t N The viscosity-average molecular weight is 2 million g / mol, 10 kg PEW, 0.25 kg lithium aluminate coupling agent, 0.25 kg lithium titanate coupling agent, and 1 kg antioxidant 1010 are put into a high-speed mixer and mixed for 2 minutes at a speed of 4800 rpm. After that, a first-stage granulation is carried out by a melt extrusion granulation equipment at a temperature of 220 ° C and a speed of 130 rpm to obtain a first-stage modified masterbatch.

[0070] (2) 10 kg of the first-stage modified masterbatch, 100 kg of LLDPE and 1.2 kg of the additional antioxidant were placed in a high-speed mixer for premixing at a rotation speed of 480 rpm for 2 minutes. Afterwards, the second-stage granulation was performed by a melt extrusion granulation device at a temperature of 170° C. and a rotation speed of 70 rpm to finally obtain a high-impact LLDPE film material S2.

[0071] Example 3

[0072] This example is intended to illustrate the use of the composition and preparation method of the present invention to prepare a high impact resistant LLDPE film material.

[0073] (1) At 30°C, take 70 kg of LLDPE (density 0.935 g / cm 3 ), 20kg low entanglement UHMWPE, of which G t N The viscosity-average molecular weight is 4 million g / mol, 10 kg PEW, 0.25 kg lithium aluminate coupling agent, 0.25 kg lithium titanate coupling agent, and 1 kg antioxidant 1076 are put into a high-speed mixer and mixed for 2 minutes at a speed of 480 rpm. After that, a first-stage granulation is carried out by a melt extrusion granulation equipment at a temperature of 260 ° C and a speed of 140 rpm to obtain a first-stage modified masterbatch.

[0074] (2) 10 kg of the first-stage modified masterbatch, 100 kg of LLDPE and 1.1 kg of the additional antioxidant were placed in a high-speed mixer for premixing, and the mixture was mixed at a speed of 480 rpm for 2 minutes. After that, the mixture was subjected to second-stage granulation at a temperature of 200° C. and a speed of 100 rpm by a melt extrusion granulation device, and finally a high-impact LLDPE film material S3 was obtained.

[0075] Example 4

[0076] This example is intended to illustrate the use of the composition and preparation method of the present invention to prepare a high impact resistant LLDPE film material.

[0077] (1) At 32°C, take 60kg LLDPE (density 0.935g / cm 3 ), 30kg low entanglement UHMWPE, of which G t N The viscosity-average molecular weight is 6 million g / mol, 10 kg PEW, 0.25 kg lithium aluminate coupling agent, 0.25 kg lithium titanate coupling agent, and 1 kg antioxidant B225 are put into a high-speed mixer and mixed for 2 minutes at a speed of 480 rpm. After that, a first-stage granulation is carried out by a melt extrusion granulation equipment at a temperature of 240 ° C and a speed of 150 rpm to obtain a first-stage modified masterbatch.

[0078] (2) 6 kg of the first-stage modified masterbatch, 100 kg of LLDPE and 1.1 kg of the additional antioxidant were placed in a high-speed mixer for premixing at a rotation speed of 480 rpm for 2 minutes. Afterwards, the second-stage granulation was performed by a melt extrusion granulation device at a temperature of 170° C. and a rotation speed of 90 rpm to finally obtain a high-impact LLDPE film material S4.

[0079] Example 5

[0080] This example is intended to illustrate the use of the composition and preparation method of the present invention to prepare a high impact resistant LLDPE film material.

[0081] A high impact resistant LLDPE film material was prepared in the same manner as in Example 1, except that: in step (1), 50 kg of LLDPE, 5 kg of low entanglement UHMWPE, 20 kg of EPDM, 0.1 kg of aluminate coupling agent, and 1.5 kg of antioxidant were taken; in addition, in step (2), an opening agent, silica, was also added, and the amount of silica added was 1 kg.

[0082] Finally, high impact resistant LLDPE film material S5 is obtained.

[0083] Example 6

[0084] This example is intended to illustrate the use of the composition and preparation method of the present invention to prepare a high impact resistant LLDPE film material.

[0085] A high impact resistant LLDPE film material was prepared in the same manner as in Example 1, except that in step (1), 50 kg of LLDPE, 10 kg of low entanglement UHMWPE, 30 kg of HDPE, 2 kg of titanate coupling agent, and 2 kg of antioxidant were taken; in addition, in step (2), a lubricant erucamide was added, and the amount of erucamide added was 1.5 kg.

[0086] Finally, high impact resistant LLDPE film material S6 is obtained.

[0087] Comparative Example 1

[0088] A high impact resistant LLDPE film material was prepared in the same manner as in Example 1, except that in step (1), no aluminate coupling agent and no titanate coupling agent were added.

[0089] As a result, LLDPE film material DS1 was obtained.

[0090] Comparative Example 2

[0091] A high impact LLDPE film material was prepared in the same manner as in Example 1, except that the film material was not prepared in steps, but rather in a one-step process, i.e., the components in steps (1) and (2) were granulated according to the conditions in step (1) in Example 1.

[0092] As a result, LLDPE film material DS2 was obtained.

[0093] Comparative Example 3

[0094] A high impact resistant LLDPE film material was prepared in the same manner as in Example 1, except that: t N The branching degree is 50 carbons / 1000 carbons, and the viscosity average molecular weight is 400×10 4 g / mol.

[0095] As a result, LLDPE film material DS3 was obtained.

[0096] Application Examples

[0097] The high impact resistant LLDPE film material prepared in the embodiments of the present invention and the comparative examples was used to prepare cast film and blown film, both with a thickness of 40 μm, and a dart impact strength test was performed to evaluate the performance. The results are shown in Table 1 for the cast film dart impact strength test and Table 2 for the blown film dart impact strength test.

[0098] Table 1

[0099]

[0100]

[0101] It can be seen from the results in Table 1 that the cast film prepared by using the high impact resistant LLDPE film special material prepared by Examples 1-6 of the present invention has excellent impact resistance.

[0102] Table 2

[0103]

[0104] It can be seen from the results in Table 2 that the blown film prepared by using the high impact resistant LLDPE film special material prepared by Examples 1-6 of the present invention has excellent impact resistance.

[0105] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A high impact LLDPE film composition, characterized in that: The composition contains a modified masterbatch, a second LLDPE and a second antioxidant, wherein the modified masterbatch contains UHMWPE, a first LLDPE, a plasticizer, a coupling agent and a first antioxidant, wherein the normalized elastic modulus G of the UHMWPE is t N ≤0.8, branching degree ≤15 carbons / 1000 carbons, viscosity average molecular weight 1.5 million g / mol-6 million g / mol; Wherein, based on the total weight of the modified masterbatch, the content of the UHMWPE does not exceed 50 weight %; The weight ratio of the UHMWPE, the first LLDPE, the plasticizer, the coupling agent and the first antioxidant is (5-40): (50-80): (10-30): (0.1-2): (1-2); The weight ratio of the first LLDPE to the second LLDPE is (50-70):100; The weight ratio of the first antioxidant to the second antioxidant is 1:(0.5-1.5); Based on the total weight of the second LLDPE, the amount of the modified masterbatch is 5-20 weight %.

2. The composition according to claim 1, wherein The normalized elastic modulus G of the UHMWPE t N ≤0.7, degree of branching ≤12 carbons / 1000 carbons, viscosity-average molecular weight 1.5 million g / mol-3 million g / mol.

3. The composition according to claim 2, wherein The normalized elastic modulus G of the UHMWPE t N ≤0.6, branching degree ≤10 carbon / 1000 carbon, viscosity-average molecular weight is 1.5 million g / mol-2 million g / mol.

4. The composition according to claim 1, wherein The LLDPE has a melt index of 0.5-10 g / 10 min at 2.16 kg and 190° C. and a density of 0.90-0.94 g / cm 3 .

5. The composition according to claim 1, wherein The plasticizer is selected from one or more of PEW, EPDM and HDPE; And / or, the coupling agent is an aluminate coupling agent and / or a titanate coupling agent.

6. The composition according to any one of claims 1 to 5, wherein The composition further comprises an auxiliary agent, wherein the auxiliary agent comprises an opening agent and / or a slip agent; Based on the total weight of the second LLDPE, the content of the auxiliary agent is no more than 2 weight %.

7. A method for preparing a high impact resistant LLDPE film material using the composition according to any one of claims 1 to 6, characterized in that: The preparation method comprises: (1) mixing UHMWPE, a first LLDPE, a plasticizer, a coupling agent and a first antioxidant to perform a first granulation to obtain a modified masterbatch; (2) The modified masterbatch, the second LLDPE and the second antioxidant are mixed and subjected to a second granulation to obtain a high impact resistant LLDPE film material.

8. The method according to claim 7, wherein: The first granulation conditions include: a temperature of 210-260°C; And / or, the second granulation conditions include: a temperature of 160-200°C.

9. A high impact resistant LLDPE film material prepared by the preparation method according to claim 7 or 8.

10. A high impact resistant LLDPE film prepared by using the high impact resistant LLDPE film material according to claim 9.

11. Use of the high impact resistant LLDPE film according to claim 10 in packaging sharp objects.

Images