Lubricant, light-transmitting cyclic olefin composite material, and preparation method therefor and use thereof

Abstract

Provided in the present application are a lubricant, a light-transmitting cyclic olefin composite material, and a preparation method therefor and the use thereof. The lubricant is obtained by polymerizing ethylene and a cyclic olefin monomer, wherein the cyclic olefin monomer comprises a compound having a structure as represented by formula I and / or a compound having a structure as represented by formula II. By selecting a cyclic olefin monomer having a specific structure to be subjected to a polymerization reaction with ethylene, the obtained lubricant has excellent lubricity, and when used for modifying a cyclic olefin copolymer, can effectively improve the processability of an obtained light-transmitting cyclic olefin composite material, and does not influence the optical performance of the composite material, such that the composite material has both excellent processability and heat resistance, and a relatively high light transmittance and a relatively low haze.

Description

Lubricant, light-transmitting cyclic olefin composite material and preparation method and application thereof TECHNICAL FIELD

[0001] The present application belongs to the technical field of polymers, and particularly relates to a lubricant, a light-transmitting cyclic olefin composite material and a preparation method and application thereof. BACKGROUND

[0002] Cyclic olefin copolymer (COC) is a high value-added thermoplastic engineering plastic formed by copolymerization of cyclic olefin monomers and ethylene, and has excellent properties such as small density, high transparency, good thermal stability, low water absorption, high optical refractive index and strong chemical corrosion resistance, and is widely used in packaging, optics, electronics and medicine and other fields.

[0003] The glass transition temperature (Tg) of the cyclic olefin material is an important parameter for measuring its heat resistance, and only when the Tg of the cyclic olefin material is higher than 130 DEG C, it has higher practical value. The two methods commonly used in the prior art to improve the Tg of the cyclic olefin material are as follows: one is to improve the Tg by increasing the insertion rate of cyclic olefin monomers in the polymer, for example, when the insertion rate of norbornene is more than 50 mol%, the ethylene-norbornene copolymer with Tg greater than 150 DEG C can be obtained, but under high cyclic olefin insertion rate, the cyclic olefin polymer obtained has strong rigidity, heavy brittleness and low toughness, which seriously hinders the application of the cyclic olefin polymer. Another method for improving the Tg of the cyclic olefin polymer is to introduce a large steric cyclic olefin monomer, so that the cyclic olefin polymer has a high Tg at a low cyclic olefin monomer insertion rate, at this time, the cyclic olefin polymer chain still has more ethylene segments, has the advantages of molecular chain flexibility and large chain entanglement density, and the toughness of the material is also maintained, but the cyclic olefin copolymer meeting the above properties usually has poor processing performance, therefore, how to improve the processing performance of the cyclic olefin copolymer has become the research focus at present.

[0004] The traditional method for improving the processability of cyclic olefin copolymer is by adding lubricant. For example, CN117511107A discloses a transparent cyclic olefin copolymer composite material with good processability and a preparation method thereof, which comprises the following components: cyclic olefin copolymer (COC) 89.6-96.6 parts by mass; poly-alpha-methylstyrene resin 0-10 parts by mass; petroleum resin 0-10 parts by mass; antioxidant 0.1-0.3 parts by mass, the preparation method is that the COC, AMS resin or petroleum resin is weighed according to the proportion, a small amount of antioxidant is added, and then it is mixed and extruded in a twin-screw extruder to form a pellet, and then the pellet is cut and dried to obtain the cyclic olefin copolymer composite material, the excellent optical properties are maintained, the processability of the composite material is improved, the mechanical properties are not obviously reduced, and the composite material can be widely applied in the fields of optical lens, electronic display screen and medical optical detection device; however, the haze of the cyclic olefin copolymer composite material provided by the application is high, which cannot be applied in high-end optical field, and the introduction of benzene ring in the COC will cause the obvious decrease of the aging resistance of the material; in addition, the addition of other traditional lubricants will also cause the decrease of the optical properties of the cyclic olefin copolymer.

[0005] Therefore, in view of the above problems, it is urgent to develop a lubricant which can effectively improve the processability of cyclic olefin polymer and does not affect the optical properties thereof. SUMMARY

[0006] The following is a summary of the subject matter of the detailed description. This summary is not intended to limit the scope of protection of the claims.

[0007] In view of the deficiencies of the prior art, the purpose of the present application is to provide a lubricant, a light-transmitting cyclic olefin composite material and a preparation method and application thereof, the lubricant can effectively improve the processability of cyclic olefin copolymer and does not affect the optical properties thereof, so that the light-transmitting cyclic olefin composite material containing the lubricant has excellent processability, heat resistance, high light transmittance and low haze, and is suitable for application in high-end optical field.

[0008] To achieve this purpose, the following technical solutions are adopted in the present application:

[0009] In a first aspect, the present application provides a lubricant, which is obtained by polymerization of ethylene and cyclic olefin monomer;

[0010] The cyclic olefin monomer comprises a compound having the structure shown in Formula I and / or a compound having the structure shown in Formula II:

[0011] In Formula I, R1-R4 are each independently selected from any one of H, halogen, C1-C20 (e.g., C1, C2, C4, C6, C8, C10, C12, C14, C16, C18, or C20, etc.) straight-chain or branched alkyl, C3-C20 (e.g., C3, C5, C7, C9, C11, C13, C15, C17, or C20, etc.) cycloalkyl, C6-C30 (e.g., C6, C9, C12, C15, C17, C19, C21, C25, or C28, etc.) aryl;

[0012] a is a natural number;

[0013] b is 0 or 1;

[0014] In Formula II, R5-R8 are each independently selected from any one of H, halogen, C1-C20 (e.g., C1, C2, C4, C6, C8, C10, C12, C14, C16, C18, or C20, etc.) straight-chain or branched alkyl, C3-C20 (e.g., C3, C5, C7, C9, C11, C13, C15, C17, or C20, etc.) cycloalkyl, C6-C30 (e.g., C6, C9, C12, C15, C17, C19, C21, C25, or C28, etc.) aryl;

[0015] c is an integer from 0 to 3 (e.g., 0, 1, or 2).

[0016] The lubricant provided herein is obtained by random copolymerization of ethylene, a compound having a structure shown in Formula I, and / or a compound having a structure shown in Formula II. By selecting the above-mentioned cycloalkene monomer having a specific structure, the obtained lubricant has excellent lubricating performance, and can effectively improve the processing performance of the cycloalkene copolymer without affecting the optical performance and heat resistance of the cycloalkene copolymer, and thus the light-transmitting cycloalkene composite material containing the lubricant has excellent processing performance, heat resistance, high light transmittance, and low haze, and is suitable for application in high-end optical fields.

[0017] In one embodiment, the cycloalkene monomer includes any one or a combination of at least two of the following compounds having the following structure:

[0018] In one embodiment, the lubricant is obtained by polymerization of ethylene and a cycloalkene monomer having a structure shown in Formula I, and has a general formula as shown below:

[0019] wherein R1-R4, a, and b have the same selection range as in Formula I, and x1 and y1 are natural numbers.

[0020] In one embodiment, the lubricant is obtained by polymerization of ethylene and a cyclic olefin monomer having a structure shown in Formula II, which is shown as follows:

[0021] wherein R5-R8 and c have the same selection range as Formula II, and x2 and y2 are natural numbers.

[0022] In one embodiment, the lubricant is obtained by polymerization of ethylene, a cyclic olefin monomer having a structure shown in Formula I, and a cyclic olefin monomer having a structure shown in Formula II, which is shown as follows:

[0023] wherein R1-R4, a and b have the same selection range as Formula I, R5-R8 and c have the same selection range as Formula II, and x3, z3 and y3 are natural numbers.

[0024] In one embodiment, the molar ratio of ethylene and the cyclic olefin monomer is (0.5-5):1, such as 0.5:1, 1:1, 1.5:1, 2:1, 2.5:1, 3:1, 3.5:1, 4:1, 4.5:1 or 5:1, etc.

[0025] In one embodiment, the weight average molecular weight of the lubricant is 800-3200, such as 800, 1000, 1200, 1400, 1600, 1800, 2000, 2300, 2600, 2900 or 3200, etc.; if the weight average molecular weight of the lubricant is too low, it is easily removed in the extrusion deashing stage, and thus cannot produce the effect, and if the weight average molecular weight of the lubricant is too high, it will result in poor flowability of itself, and cannot provide the effect of the lubricant.

[0026] In one embodiment, the molecular weight distribution index of the lubricant is 3-8, such as 3, 4, 5, 6, 7 or 8, etc.

[0027] In a second aspect, the present application provides a preparation method of the lubricant according to the first aspect, which comprises: polymerizing ethylene and a cyclic olefin monomer to obtain the lubricant.

[0028] In one embodiment, the polymerization reaction is carried out in the presence of a catalyst.

[0029] In one embodiment, the temperature of the polymerization reaction is 5-80°C, such as 5°C, 10°C, 20°C, 40°C, 60°C or 80°C, etc.

[0030] In one embodiment, the time of the polymerization reaction is 5-60 min, such as 5 min, 10 min, 20 min, 30 min, 40 min, 50 min or 60 min, etc.

[0031] In one embodiment, the pressure of the polymerization reaction is 0-20 bar, such as 0 bar, 2 bar, 4 bar, 6 bar, 8 bar, 10 bar, 12 bar, 14 bar, 16 bar, 18 bar, or 20 bar, etc.

[0032] In a third aspect, the present application provides a light-transmitting cyclic olefin composite material, which comprises the following components by weight parts:

[0033] Cyclic olefin copolymer 94.5-99.4 parts by weight;

[0034] Lubricant 0.5-5 parts by weight.

[0035] The amount of the cyclic olefin copolymer can be 94.5 parts by weight, 95 parts by weight, 95.5 parts by weight, 96 parts by weight, 96.5 parts by weight, 97 parts by weight, 97.5 parts by weight, 98 parts by weight, 98.5 parts by weight, or 99 parts by weight; the amount of the lubricant can be 0.5 parts by weight, 1 part by weight, 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, 3 parts by weight, 3.5 parts by weight, 4 parts by weight, 4.5 parts by weight, or 5 parts by weight; if the amount of the lubricant is too high, it can easily lead to a decrease in the heat resistance of the cyclic olefin composite material, and if the amount of the lubricant is too low, it can easily lead to a limited improvement in the processability of the cyclic olefin composite material.

[0036] In one embodiment, the weight average molecular weight of the cyclic olefin copolymer is ≥10000, such as 10000, 11000, 12000, 13000, 14000, 15000, 20000, 25000, 50000, or 100000, etc.

[0037] In one embodiment, the glass transition temperature (Tg) of the cyclic olefin copolymer is 65-210℃, such as 65℃, 70℃, 80℃, 90℃, 110℃, 120℃, 140℃, 160℃, 180℃, or 210℃, etc.

[0038] In one embodiment, the melt index of the cyclic olefin copolymer is 5-80 g / 10 min, such as 5 g / 10 min, 10 g / 10 min, 20 g / 10 min, 30 g / 10 min, 40 g / 10 min, 50 g / 10 min, 60 g / 10 min, 70 g / 10 min, or 80 g / 10 min, etc., with a test temperature of 260℃ and a load of 2.16 kg.

[0039] In one embodiment, the raw material for preparing the cyclic olefin copolymer is the same as the raw material for preparing the lubricant; the cyclic olefin copolymer and the lubricant prepared from the same raw material have better compatibility, which can further improve the optical performance of the obtained transparent cyclic olefin composite.

[0040] In the present application, the method for preparing the cyclic olefin copolymer is not particularly limited and can be specifically referred to the method for preparing the lubricant.

[0041] In the present application, the transparent cyclic olefin composite further comprises other additives, including but not limited to antioxidants.

[0042] In one embodiment, the transparent cyclic olefin composite further comprises 0.1-0.5 parts by weight (for example, 0.1 parts by weight, 0.15 parts by weight, 0.2 parts by weight, 0.25 parts by weight, 0.3 parts by weight, 0.35 parts by weight, 0.4 parts by weight or 0.45 parts by weight, etc.) of an antioxidant.

[0043] In one embodiment, the antioxidant comprises any one or a combination of at least two of pentaerythritol tetrakis[β(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (antioxidant 1010), n-octadecanol β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (antioxidant 1076) or tris(2,4-di-tert-butylphenyl) phosphite (antioxidant 168).

[0044] In a fourth aspect, the present application provides a method for preparing the transparent cyclic olefin composite according to the third aspect, which comprises mixing the cyclic olefin copolymer, the lubricant according to the first aspect and optionally an antioxidant, and then extruding and granulating to obtain the transparent cyclic olefin composite.

[0045] In one embodiment, the mixing is carried out at room temperature.

[0046] In one embodiment, the mixing is carried out for 5-30 min, for example, 5 min, 10 min, 15 min, 20 min, 25 min or 30 min, etc.

[0047] In one embodiment, the mixing is carried out at a rotation speed of 400-800 r / min, for example, 400 r / min, 450 r / min, 500 r / min, 550 r / min, 600 r / min, 650 r / min, 700 r / min, 750 r / min or 800 r / min, etc.

[0048] In one embodiment, the extruding and granulating are carried out in a twin-screw extruder.

[0049] In one embodiment, the extrusion granulation further comprises a drying step after the extrusion granulation.

[0050] In a fifth aspect, the application provides a use of the lubricant of the first aspect or the light-transmitting cyclic olefin composite of the third aspect in the preparation of a packaging product, an optical product or a pharmaceutical product.

[0051] Compared with the prior art, the application has the following beneficial effects:

[0052] The lubricant provided by the application is obtained by polymerization of ethylene and a cyclic olefin monomer, and the cyclic olefin monomer comprises a compound having the structure shown in Formula I and / or a compound having the structure shown in Formula II; by selecting a cyclic olefin monomer having a specific structure and ethylene to undergo polymerization, the obtained lubricant has excellent lubricity, is used for modification of a cyclic olefin copolymer, can effectively improve the processing performance of the obtained light-transmitting cyclic olefin composite, and does not affect the optical performance, so that the light-transmitting cyclic olefin composite has excellent processing performance, heat resistance, high light transmittance and low haze.

[0053] Other aspects can be apparent after reading and understanding the accompanying drawings and detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0054] The accompanying drawings are used to provide a further understanding of the technical solutions of the present application, and constitute a part of the specification, and are used to explain the technical solutions of the present application together with the embodiments of the present application, and do not constitute a limitation on the technical solutions of the present application.

[0055] FIG. 1 is a molecular weight distribution diagram of the light-transmitting cyclic olefin composite provided by Application Example 1. DETAILED DESCRIPTION

[0056] The technical solutions of the present application are further described below through specific embodiments. Those skilled in the art should understand that the embodiments are only used to help understand the present application, and should not be regarded as a specific limitation on the present application.

[0057] Unless otherwise specified, the raw materials involved in the following specific embodiments are all conventional materials in the art, and can be purchased by commercially available products.

[0058] Preparation Example 1-1

[0059] A cyclic olefin monomer has a structural formula of

[0060] The preparation process of the cyclic olefin monomer provided by the present preparation example is shown as follows:

[0061] The preparation method of the cyclic olefin monomer provided by the present preparation example comprises the following steps:

[0062] (1) 0.5 mol of dicyclopentadiene (DCPD) and 0.001 mol of Ru-Al2O3 catalyst were subjected to selective hydrogenation at 50°C for 1.5 min to obtain 5,6-dihydrodicyclopentadiene (DCP);

[0063] (2) 0.5 mol of 5,6-dihydrodicyclopentadiene and 0.1 mol of dicyclopentadiene were reacted at 230°C for 90 min, and distilled under reduced pressure to obtain a cyclic olefin monomer having a purity of greater than 99%.

[0064] Preparation Example 1-2

[0065] A cyclic olefin monomer, specifically tetracyclododecene, has a structural formula of

[0066] The preparation method of the cyclic olefin monomer provided by the present preparation example includes the following steps:

[0067] 0.5 mol of norbornene and 0.25 mol of dicyclopentadiene were reacted at 230°C for 120 min, and distilled under reduced pressure to obtain tetracyclododecene having a purity of greater than 99%.

[0068] Preparation Example 2-1

[0069] A cyclic olefin copolymer has a weight average molecular weight of 43,000;

[0070] The preparation method of the cyclic olefin copolymer provided by the present preparation example includes: in a polymerization reactor with an effective volume of 1 L, hydrogen, ethylene, the cyclic olefin monomer provided by Preparation Example 1-1, cyclohexane, 1.0% EtCp(Ind)ZrCl2 cyclohexane solution and 10% methylaluminoxane cyclohexane solution are introduced to perform continuous solution polymerization, the polymerization temperature is 40°C, the polymerization pressure is 5.0 bar, the polymerization residence time is 30 min, the ethylene unit residence time feed is 0.7 mol, the hydrogen unit residence time feed is 0.005 mol, the cyclic olefin monomer provided by Preparation Example 1-1 unit residence time feed is 0.8 mol, the cyclohexane unit residence time feed is 7.8 mol, the main catalyst EtCp(Ind)ZrCl2 unit residence time feed is 1.28 μmol; the cocatalyst methylaluminoxane unit residence time feed is 2.56 mmol, to obtain a cyclic olefin copolymer A.

[0071] Preparation Example 2-2

[0072] A cyclic olefin copolymer has a weight average molecular weight of 45,000;

[0073] The preparation method of the cycloolefin copolymer provided in the present preparation example comprises: continuously feeding hydrogen, ethylene, the tetracyclododecene provided in Preparation Example 1-2, cyclohexane, a 1.0% EtCp(Ind)ZrCl2 cyclohexane solution and a 10% methylaluminoxane cyclohexane solution into a polymerization reactor with an effective volume of 1L to perform continuous solution polymerization, the polymerization temperature is 40°C, the polymerization pressure is 5.0bar, the polymerization residence time is 30min, the ethylene unit residence time feed is 0.75mol, the hydrogen unit residence time feed is 0.005mol, the tetracyclododecene unit residence time feed provided in Preparation Example 1-2 is 1mol, the cyclohexane unit residence time feed is 8.3mol, the main catalyst EtCp(Ind)ZrCl2 unit residence time feed is 1.25μmol; the cocatalyst methylaluminoxane unit residence time feed is 2.5mmol, to obtain the cycloolefin copolymer.

[0074] Example 1

[0075] A lubricant with a weight average molecular weight of 1800, which is obtained by polymerization of ethylene and the cycloolefin monomer A provided in Preparation Example 1-1 at a molar ratio of 7:8;

[0076] The preparation method of the lubricant provided in the present example comprises: continuously feeding hydrogen, ethylene, the cycloolefin monomer provided in Preparation Example 1-1, cyclohexane, a 1.0% EtCp(Ind)ZrCl2 cyclohexane solution and a 10.0% methylaluminoxane cyclohexane solution into a polymerization reactor with an effective volume of 1L to perform continuous solution polymerization, the polymerization temperature is 40°C, the polymerization pressure is 5.0bar, the polymerization residence time is 30min, the ethylene unit residence time feed is 0.7mol, the hydrogen unit residence time feed is 0.04mol, the cycloolefin monomer unit residence time feed provided in Preparation Example 1-1 is 0.8mol, the cyclohexane unit residence time feed is 7.8mol, the main catalyst EtCp(Ind)ZrCl2 unit residence time feed is 1.28μmol; the cocatalyst methylaluminoxane unit residence time feed is 2.56mmol, to obtain the lubricant.

[0077] Example 2

[0078] A lubricant with a weight average molecular weight of 1600, which is obtained by polymerization of ethylene and tetracyclododecene at a molar ratio of 7.5:10;

[0079] The preparation method of the lubricant comprises: continuously feeding hydrogen, ethylene, the tetralordodecene provided in Preparation Example 1-2, cyclohexane, 1.0% EtCp(Ind)ZrCl2 cyclohexane solution and 10.0% methylaluminoxane cyclohexane solution into a polymerization reactor with an effective volume of 1L to carry out continuous solution polymerization, the polymerization temperature is 40°C, the polymerization pressure is 5.0bar, the polymerization residence time is 30min, the ethylene unit residence time feed is 0.75mol, the hydrogen unit residence time feed is 0.36mol, the tetralordodecene unit residence time feed provided in Preparation Example 1-2 is 1mol, the cyclohexane unit residence time feed is 8.3mol, the main catalyst EtCp(Ind)ZrCl2 unit residence time feed is 1.25μmol; the cocatalyst methylaluminoxane unit residence time feed is 2.5mmol, to obtain the lubricant.

[0080] Example 3

[0081] A lubricant, which is different from Example 1, by adjusting the amount of hydrogen unit residence time feed, so that the weight average molecular weight of the obtained lubricant is 500, and other raw materials and preparation methods refer to Example 1.

[0082] Example 4

[0083] A lubricant, which is different from Example 1, by adjusting the amount of hydrogen unit residence time feed, so that the weight average molecular weight of the obtained lubricant is 3500, and other raw materials and preparation methods refer to Example 1.

[0084] Application Examples 1-11 and Comparative Application Examples 1-4

[0085] Application Examples 1-11 and Comparative Application Examples 1-4 respectively provide a light-transmitting cyclic olefin composite material, which comprises various components and amounts as shown in Table 1, in Table 1, the amount of each component is "parts by weight";

[0086] Table 1

[0087] The preparation method of the light-transmitting cyclic olefin composite material provided in Application Examples 1-11 and Comparative Application Examples 1-4 comprises:

[0088] (1) The cyclic olefin copolymer, the lubricant and the antioxidant are added into a high-speed mixer at one time, blended at room temperature, the rotating speed is 500r / min, the mixing time is 20min, to obtain a mixture;

[0089] (2) The mixture obtained in step (1) is extruded and granulated by using a twin-screw extruder with a length-diameter ratio of 40:1 and a screw diameter of 16.0 mm; the temperature of each section of the extruder is set to 220°C, 225°C, 230°C, 235°C, 240°C, 240°C, and 235°C from the feeding section to the die, and then the extrudate is cooled by water, cut into particles, and dried to obtain the light-transmitting cyclic olefin composite material.

[0090] Performance test:

[0091] (1) Polydispersity index: The light-transmitting cyclic olefin composite material provided in Application Example 1 is tested by using gel permeation chromatography (GPC), and the molecular weight distribution diagram of the light-transmitting cyclic olefin composite material provided in Application Example 1 is shown in FIG. 1.

[0092] As can be seen from FIG. 1, the lubricant and the cyclic olefin copolymer in the light-transmitting cyclic olefin composite material provided in Application Example 1 are very uniformly dispersed, and the two have good compatibility.

[0093] (2) Glass transition temperature (Tg): measured by TA Instruments DSC25, specifically: 5-7 mg of sample is heated to 260°C at a rate of 20°C / min, kept constant for 5 min to eliminate thermal history, then cooled to -40°C at a rate of 10°C / min, kept constant for 3 min, and then heated to 260°C at a rate of 10°C / min, and Tg is obtained from the second heating curve.

[0094] (3) Light transmittance and haze: measured by a HAM-200 haze meter from a distance, the sample is molded into a circular sheet with a diameter of 25 mm and a thickness of 1 mm, and the light transmittance and haze are tested under a standard C light source of 380-780 nm.

[0095] (4) Melt index: measured by INSTRON MFi5 at 260°C and 2.16 kg.

[0096] The light-transmitting cyclic olefin composite materials provided in Application Examples 1-11 and Comparative Application Examples 1-4 are tested according to the above test methods (2)-(4), and the test results are shown in Table 2.

[0097] Table 2

[0098] (1) The light-transmitting cyclic olefin composite materials provided in Application Examples 1-11 have excellent processing performance and optical properties;

[0099] As can be seen from the data of Comparative Application Example 1 and Comparative Application Example 1, and Comparative Application Example 2 and Comparative Application Example 3, the melt index of the cyclic olefin composite material without adding a lubricant is lower, and the processing performance is poorer.

[0100] Comparing the data of application example 1 and comparative application example 2, and the data of application example 2 and comparative application example 4, it can be seen that the cyclic olefin composite prepared by using zinc stearate as the lubricant has a suitable melt index, but the light transmittance is low and the haze is high, which indicates that the optical performance has obviously decreased.

[0101] (2) Further comparing the data of application examples 1-4, it can be seen that when the same lubricant and cyclic olefin copolymer are used, the processing performance of the composite can be further optimized without affecting the optical performance, and when the selected lubricant is not matched, the difference in refractive index between the materials will cause the optical performance to decrease.

[0102] (3) Further comparing the data of application example 1 and application examples 5-9, it can be seen that by controlling the amount of the lubricant, the processing performance of the cyclic olefin composite can be adjusted, and when the amount of the lubricant is too low, the processing performance of the obtained cyclic olefin composite is limitedly improved; and when the amount of the lubricant is too high, the heat resistance of the cyclic olefin composite will be affected.

[0103] (4) Finally comparing the data of application example 1 and application examples 10-11, it can be seen that when the weight average molecular weight of the lubricant is too low, low molecular volatilization will occur during the processing; and when the weight average molecular weight of the lubricant is too high, the processing performance of the cyclic olefin composite is not obviously improved.

[0104] The applicant declares that the present application is illustrated by the above examples, but the present application is not limited to the above examples, i.e. it does not mean that the present application must rely on the above examples to be implemented. It should be understood by those skilled in the art that any improvement of the present application, equivalent replacement of each raw material of the product of the present application, addition of auxiliary ingredients, selection of specific modes, etc. fall within the protection scope and disclosure scope of the present application.

Claims

1. A light-transmitting cyclic olefin composite material, comprising the following components by weight: 94.5–99.4 parts by weight of cyclic olefin copolymers; Lubricant 0.5 to 5 parts by weight; The weight-average molecular weight of the lubricant is 800–3200; The weight-average molecular weight of the cyclic olefin copolymer is ≥10000; The lubricant is obtained by polymerization of ethylene and cyclic olefin monomers; The raw materials for preparing the cyclic olefin copolymer are the same as those for preparing the lubricant; The cyclic olefin monomers include compounds having the structure shown in Formula I and / or compounds having the structure shown in Formula II: In Formula I, R1 to R4 are each independently selected from any one of H, halogen, C1 to C20 straight-chain or branched alkyl, C3 to C20 cycloalkyl, and C6 to C30 aryl; a is a natural number; b is 1; In Formula II, R5 to R8 are each independently selected from any one of H, halogen, C1 to C20 straight-chain or branched alkyl, C3 to C20 cycloalkyl, and C6 to C30 aryl. c is an integer from 0 to 3.

2. The transparent cyclic olefin composite material according to claim 1, wherein, The cyclic olefin monomer includes any one or a combination of at least two of the following compounds having the following structures:

3. The light-transmitting cyclic olefin composite material according to claim 1, wherein, The molar ratio of ethylene to cyclic olefin monomers is (0.5–5):

1.

4. A method for preparing a transparent cyclic olefin composite material as described in any one of claims 1 to 3, comprising: The translucent cyclic olefin composite material is obtained by mixing a cyclic olefin copolymer and a lubricant, followed by extrusion and granulation.

5. The application of a light-transmitting cyclic olefin composite material as described in claims 1 to 3 in the preparation of packaging products, optical products, or pharmaceutical products.

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