1. The ultraviolet light irradiation crosslinking polyolefin material is characterized by comprising the following components in parts by weight:

40-60 parts of polyolefin; 1-5 parts of a first photoinitiator; 5-15 parts of bonding agent; 20-30 parts of a polymer precursor; 0.1 to 1 portion of second photoinitiator; 0.1 to 1 portion of cross-linking agent; 1-3 parts of a silane coupling agent; 0.01-0.1 part of light stabilizer.

2. The ultraviolet light irradiation crosslinked polyolefin material according to claim 1, wherein the polyolefin is prepared by mixing the components in a mass ratio of 1: (0.5-1) polyethylene and polypropylene.

3. The ultraviolet radiation crosslinked polyolefin material of claim 1, wherein the first photoinitiator is one or a combination of two or more of 2, 2-dimethoxy-2-phenylacetophenone, 2-diethoxyacetophenone, 1-hydroxycyclohexyl benzophenone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1- [4- (2-hydroxyethoxy) phenyl ] -2-hydroxy-2-methyl-1-propan-1-one; the second photoinitiator is one or two of methyl benzoate and benzoylphosphine oxide.

4. The uv-radiation crosslinked polyolefin material of claim 1, wherein the bonding agent is tris (2-methylaziridine) phosphine oxide; the cross-linking agent is one or the combination of more than two of polyethylene glycol dimethacrylate, polypropylene glycol dimethacrylate and glycerol ethoxylation dimethacrylate.

5. The UV-radiation cross-linked polyolefin material of claim 1, wherein the polymer precursor is one or a combination of two or more of methyl methacrylate, 2- (dimethylamino) ethyl acrylate, 2-hydroxyethyl methacrylate, 1, 6-hexanediol diacrylate, 1, 6-hexanediol dimethacrylate and 2-methoxyethyl acrylate.

6. The UV-radiation crosslinked polyolefin material according to claim 1, wherein the silane coupling agent is one or a combination of two or more of vinyltrimethoxysilane, vinyltriethoxysilane, vinyl-tris- (2-methoxyethoxy) silane, vinylmethyldimethoxysilane, methyltrimethoxysilane, octyltriethoxysilane, and methyltriethoxysilane; the light stabilizer is a compound of a hindered amine light stabilizer and a triazine ultraviolet absorbent, a benzotriazole ultraviolet absorbent and a benzophenone ultraviolet absorbent.

7. The ultraviolet light irradiation crosslinked polyolefin material according to claim 1, wherein the mass ratio of the polyolefin to the first photoinitiator is 43: (1-5).

8. The ultraviolet light irradiation crosslinking polyolefin material according to claim 1, wherein the mass ratio of the polymer precursor, the second photoinitiator and the crosslinking agent is 22: 0.5: (0.5-1).

9. A method for preparing the ultraviolet light irradiation crosslinking polyolefin material according to any one of claims 1 to 8, which comprises the following preparation steps:

s1: adding a first photoinitiator into polyolefin, uniformly mixing, adding a bonding agent, and uniformly stirring to obtain a first mixture;

s2: uniformly mixing a polymer precursor, a second photoinitiator and a cross-linking agent to form a second mixture;

s3: adding a light stabilizer into the silane coupling agent to enable the light stabilizer to be coated by the silane coupling agent to form a third mixture;

s4: and stirring and mixing the first mixture and the second mixture, adding a third mixture while stirring so that the third mixture can be dispersed between the first mixture and the second mixture, and then completing crosslinking under ultraviolet irradiation to form the ultraviolet irradiation crosslinked polyolefin material.

10. The UV-irradiated crosslinked polyolefin material of claim 9, wherein in step S4, the UV light has a wavelength of 200nm to 400nm and a light intensity of 400mW/cm²。

Background

Polyethylene is a general thermoplastic polymer material with the largest output and the widest application in polymer materials, plays an increasingly important role in national economic construction and daily life, however, the polyethylene material has a very limited use temperature, is easy to deform under the condition of raising the temperature, even loses the mechanical strength and cannot be used, and therefore, the polyethylene material is subjected to crosslinking modification by adopting a proper method to become a high-temperature-resistant thermosetting material so as to improve the use value of the polyethylene material.

There are three main methods for crosslinking polyethylene: high energy radiation crosslinking, chemical crosslinking, and ultraviolet crosslinking. The high-energy radiation crosslinking method uses high-energy rays to irradiate polyethylene, so that C-H bonds and C-C bonds in the polyethylene are broken, and formed macromolecular free radicals are compounded to generate crosslinking. Chemical crosslinking methods, such as peroxide methods, generate free radicals to initiate the crosslinking reaction of polyethylene by adding peroxide to decompose at high temperature. The ultraviolet crosslinking method is to generate a series of macromolecular free radicals generated in photophysical and photochemical processes by adding a photoinitiator in polyethylene base materials, and to generate a three-dimensional reticular crosslinking structure by rapid compounding.

At present, the ultraviolet crosslinking method is the latest crosslinking mode for polyethylene to form a crosslinking structure, but the crosslinking is formed by directly compounding two macromolecular free radicals, because the activity of the macromolecular chain is poor, the probability of collision of the two macromolecular free radicals is low, so that the crosslinking uniformity is poor, and the high-temperature resistance performance is poor.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide an ultraviolet radiation crosslinking polyolefin material which has good high temperature resistance and good stability.

The second purpose of the invention is to provide a preparation method of the ultraviolet irradiation crosslinking polyolefin material, which is simple and easy to control and can be applied to large-scale production.

One of the purposes of the invention is realized by adopting the following technical scheme:

an ultraviolet radiation cross-linked polyolefin material comprises the following components in parts by weight:

40-60 parts of polyolefin; 1-5 parts of a first photoinitiator; 5-15 parts of bonding agent; 20-30 parts of a polymer precursor; 0.1 to 1 portion of second photoinitiator; 0.1 to 1 portion of cross-linking agent; 1-3 parts of a silane coupling agent; 0.01-0.1 part of light stabilizer.

Further, the polyolefin is prepared by mixing the components in a mass ratio of 1: (0.5-1) polyethylene and polypropylene. Polyethylene has low strength, hardness and rigidity, but high ductility and impact strength and low friction; polypropylene is a crystalline material with higher strength and better heat resistance; the heat resistance of the polyethylene can be greatly enhanced by mixing the polyethylene and the polypropylene. Preferably, the polyolefin is prepared from a polyolefin in a mass ratio of 1: 0.8 of polyethylene and polypropylene.

Further, the first photoinitiator is one or the combination of more than two of 2, 2-dimethoxy-2-phenylacetophenone, 2-diethoxyacetophenone, 1-hydroxycyclohexyl benzophenone, 2-hydroxy-2-methyl-1-phenyl-1-propanone and 1- [4- (2-hydroxyethoxy) phenyl ] -2-hydroxy-2-methyl-1-propane-1-ketone; the second photoinitiator is one or two of methyl benzoate and benzoylphosphine oxide. The application adopts two photoinitiators, so that the photoinitiation rates are different, and a stepped reaction rate is formed.

Further, the bonding agent is tris (2-methylaziridine) phosphine oxide; the cross-linking agent is one or the combination of more than two of polyethylene glycol dimethacrylate, polypropylene glycol dimethacrylate and glycerol ethoxylation dimethacrylate. The tris (2-methyl aziridine) phosphine oxide is used as a bonding agent of a coating layer of a high polymer material, and can enhance the mechanical property and the aging resistance of a product. Through the action of the tris (2-methyl aziridine) phosphine oxide, the polyolefin and the polymer precursor can be connected with intermolecular force, and a three-dimensional structure is formed after crosslinking.

The polymer precursor is one or the combination of more than two of methyl methacrylate, 2- (dimethylamino) ethyl acrylate, 2-hydroxyethyl methacrylate, 1, 6-hexanediol diacrylate, 1, 6-hexanediol dimethacrylate and 2-methoxyethyl acrylate. The polymer precursor can generate free radicals under the action of ultraviolet rays, a cross-linking agent and an initiator to enable the polymer precursor to generate a cross-linking reaction, and meanwhile, the free radicals of the polymer precursor and the free radicals of the polyolefin are cross-linked to form a more complex three-dimensional cross-linked network structure so as to enhance the chemical properties of the polyolefin.

Further, the silane coupling agent is one or the combination of more than two of vinyltrimethoxysilane, vinyltriethoxysilane, vinyl-tri- (2-methoxyethoxy) silane, vinylmethyldimethoxysilane, methyltrimethoxysilane, octyltriethoxysilane and methyltriethoxysilane; the silane oxygen group in the silane coupling agent has reactivity to inorganic matters, and the organic functional group has reactivity or compatibility to organic matters, so that a bonding layer of an organic matrix, the silane coupling agent and an inorganic matrix can be formed. The light stabilizer is a compound of a hindered amine light stabilizer and a triazine ultraviolet absorbent, a benzotriazole ultraviolet absorbent and a benzophenone ultraviolet absorbent. The hindered amine light stabilizer is a piperidine derivative with steric hindrance effect, has the capability of capturing free radicals and decomposing peroxide, is compounded with the ultraviolet absorbent, and can achieve the effect of being more rational than any single ultraviolet absorbent. In one embodiment, the mass ratio of the hindered amine light stabilizer to the triazine ultraviolet absorber, the benzotriazole ultraviolet absorber and the benzophenone ultraviolet absorber is 1: (0.2-0.5): (0.2-0.5): (0.2-0.5). Preferably, the mass ratio of the hindered amine light stabilizer to the triazine ultraviolet absorbent, the benzotriazole ultraviolet absorbent and the benzophenone ultraviolet absorbent is 1: 0.3: 0.3: 0.2.

further, the mass ratio of the polyolefin to the first photoinitiator is 43: (1-5), preferably, the mass ratio of the polyolefin to the first photoinitiator is 43: 3.

further, the mass ratio of the polymer precursor to the second photoinitiator to the cross-linking agent is 22: 0.5: (0.5-1), and preferably, the mass ratio of the polymer precursor to the second photoinitiator to the crosslinking agent is 22: 0.5: 1.

the second purpose of the invention is realized by adopting the following technical scheme:

a preparation method of an ultraviolet irradiation crosslinking polyolefin material comprises the following preparation steps:

s1: adding a first photoinitiator into polyolefin, uniformly mixing, adding a bonding agent, and uniformly stirring to obtain a first mixture;

s2: uniformly mixing a polymer precursor, a second photoinitiator and a cross-linking agent to form a second mixture;

s3: adding a light stabilizer into the silane coupling agent to enable the light stabilizer to be coated by the silane coupling agent to form a third mixture;

s4: and stirring and mixing the first mixture and the second mixture, adding a third mixture while stirring so that the third mixture can be dispersed between the first mixture and the second mixture, and then completing crosslinking under ultraviolet irradiation to form the ultraviolet irradiation crosslinked polyolefin material.

Further, in step S4, the ultraviolet light has a wavelength of 200nm to 400nm and a light intensity of 400mW/cm²The crosslinking time is 3S-5S.

Compared with the prior art, the invention has the beneficial effects that:

the invention adopts polyolefin, a first photoinitiator, a polymer precursor, a second photoinitiator, a cross-linking agent, a silane coupling agent and other materials to form a cross-linked polymer with gradient according to the speed of a cross-linking reaction, the first photoinitiator and the second photoinitiator generate free radicals after being irradiated by ultraviolet rays to ensure that the polyolefin is cross-linked again, meanwhile, the polymer precursor also generates the cross-linking reaction under the action of the cross-linking agent, partial polyolefin and partial polymer precursor also generate the cross-linking reaction to form a more complex cross-linked polymer, and finally, the reaction is terminated due to the action of a light stabilizer to avoid the degradation reaction of the materials so as to ensure better high temperature resistance.

The light stabilizer is coated in the silane coupling agent, and under the condition of fast and slow reaction, when the silane coupling agent, the polymer and the polyolefin can perform a crosslinking reaction, the light stabilizer is released to terminate the chain reaction, so that the photooxidation damage of the high-intensity ultraviolet irradiation to the surface of the crosslinked material is avoided.

The preparation method is simple and easy to control, and can be applied to large-scale production.

Detailed Description

The present invention is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment. The following are specific examples of the present invention, and raw materials, equipments and the like used in the following examples can be obtained by purchasing them unless otherwise specified.

Example 1

An ultraviolet radiation cross-linked polyolefin material comprises the following components in parts by weight:

40 parts of polyolefin; 1 part of a first photoinitiator; 5 parts of bonding agent; 20 parts of polymer precursor; 0.1 part of a second photoinitiator; 0.1 part of a crosslinking agent; 1 part of a silane coupling agent; light stabilizer 0.01. Wherein the polyolefin is prepared from the following components in a mass ratio of 1: 0.8 of polyethylene and polypropylene; the first photoinitiator is 2, 2-dimethoxy-2-phenylacetophenone; the second photoinitiator is methyl benzoate; the bonding agent is tris (2-methylaziridine) phosphine oxide; the cross-linking agent is polyethylene glycol dimethacrylate; the polymer precursor is methyl methacrylate; the silane coupling agent is vinyl trimethoxy silane; the light stabilizer is prepared from the following components in a mass ratio of 1: 0.3: 0.3: 0.2 of hindered amine light stabilizer, triazine ultraviolet absorbent, benzotriazole ultraviolet absorbent and benzophenone ultraviolet absorbent.

A preparation method of an ultraviolet irradiation crosslinking polyolefin material comprises the following preparation steps:

s1: adding a first photoinitiator into polyolefin, uniformly mixing, adding a bonding agent, and uniformly stirring to obtain a first mixture;

s2: uniformly mixing a polymer precursor, a second photoinitiator and a cross-linking agent to form a second mixture;

s3: adding a light stabilizer into the silane coupling agent to enable the light stabilizer to be coated by the silane coupling agent to form a third mixture;

s4: mixing the first mixture with the second mixture under stirring, adding the third mixture under stirring to allow the third mixture to be dispersed between the first mixture and the second mixture, and then mixing at a wavelength of 300nm and a light intensity of 400mW/cm²Under the irradiation of the ultraviolet light, the crosslinking time is 3S, and the crosslinking is finished to form the ultraviolet light irradiation crosslinking polyolefin material.

Example 2

An ultraviolet radiation cross-linked polyolefin material comprises the following components in parts by weight:

50 parts of polyolefin; 3 parts of a first photoinitiator; 10 parts of bonding agent; 25 parts of a polymer precursor; 0.5 part of a second photoinitiator; 0.5 part of a crosslinking agent; 2 parts of a silane coupling agent; 0.05 part of light stabilizer. Wherein the polyolefin is prepared from the following components in a mass ratio of 1: 0.8 of polyethylene and polypropylene; the first photoinitiator is 2, 2-dimethoxy-2-phenylacetophenone; the second photoinitiator is methyl benzoate; the bonding agent is tris (2-methylaziridine) phosphine oxide; the cross-linking agent is polyethylene glycol dimethacrylate; the polymer precursor is methyl methacrylate; the silane coupling agent is vinyl trimethoxy silane; the light stabilizer is prepared from the following components in a mass ratio of 1: 0.3: 0.3: 0.2 of hindered amine light stabilizer, triazine ultraviolet absorbent, benzotriazole ultraviolet absorbent and benzophenone ultraviolet absorbent.

A preparation method of an ultraviolet irradiation crosslinking polyolefin material comprises the following preparation steps:

s1: adding a first photoinitiator into polyolefin, uniformly mixing, adding a bonding agent, and uniformly stirring to obtain a first mixture;

s2: uniformly mixing a polymer precursor, a second photoinitiator and a cross-linking agent to form a second mixture;

s3: adding a light stabilizer into the silane coupling agent to enable the light stabilizer to be coated by the silane coupling agent to form a third mixture;

s4: mixing the first mixture with the second mixture under stirring, adding the third mixture under stirring to allow the third mixture to be dispersed between the first mixture and the second mixture, and then mixing at a wavelength of 300nm and a light intensity of 400mW/cm²Under the irradiation of the ultraviolet light, the crosslinking time is 3S, and the crosslinking is finished to form the ultraviolet light irradiation crosslinking polyolefin material.

Example 3

An ultraviolet radiation cross-linked polyolefin material comprises the following components in parts by weight:

60 parts of polyolefin; 5 parts of a first photoinitiator; 15 parts of a bonding agent; 30 parts of a polymer precursor; 1 part of a second photoinitiator; 1 part of a crosslinking agent; 3 parts of a silane coupling agent; 0.1 part of light stabilizer. Wherein the polyolefin is prepared from the following components in a mass ratio of 1: 0.8 of polyethylene and polypropylene; the first photoinitiator is 2, 2-dimethoxy-2-phenylacetophenone; the second photoinitiator is methyl benzoate; the bonding agent is tris (2-methylaziridine) phosphine oxide; the cross-linking agent is polyethylene glycol dimethacrylate; the polymer precursor is methyl methacrylate; the silane coupling agent is vinyl trimethoxy silane; the light stabilizer is prepared from the following components in a mass ratio of 1: 0.3: 0.3: 0.2 of hindered amine light stabilizer, triazine ultraviolet absorbent, benzotriazole ultraviolet absorbent and benzophenone ultraviolet absorbent.

A preparation method of an ultraviolet irradiation crosslinking polyolefin material comprises the following preparation steps:

s1: adding a first photoinitiator into polyolefin, uniformly mixing, adding a bonding agent, and uniformly stirring to obtain a first mixture;

s2: uniformly mixing a polymer precursor, a second photoinitiator and a cross-linking agent to form a second mixture;

s3: adding a light stabilizer into the silane coupling agent to enable the light stabilizer to be coated by the silane coupling agent to form a third mixture;

s4: mixing the first mixture with the second mixture under stirring, adding the third mixture under stirring to allow the third mixture to be dispersed between the first mixture and the second mixture, and then mixing at a wavelength of 300nm and a light intensity of 400mW/cm²Under the irradiation of the ultraviolet light, the crosslinking time is 3S, and the crosslinking is finished to form the ultraviolet light irradiation crosslinking polyolefin material.

Example 4

An ultraviolet radiation cross-linked polyolefin material comprises the following components in parts by weight:

43 parts of polyolefin; 3 parts of a first photoinitiator; 10 parts of bonding agent; 22 parts of polymer precursor; 0.5 part of a second photoinitiator; 1 part of a crosslinking agent; 3 parts of a silane coupling agent; 0.05 part of light stabilizer. Wherein the polyolefin is prepared from the following components in a mass ratio of 1: 0.8 of polyethylene and polypropylene; the first photoinitiator is 2, 2-dimethoxy-2-phenylacetophenone; the second photoinitiator is methyl benzoate; the bonding agent is tris (2-methylaziridine) phosphine oxide; the cross-linking agent is polyethylene glycol dimethacrylate; the polymer precursor is methyl methacrylate; the silane coupling agent is vinyl trimethoxy silane; the light stabilizer is prepared from the following components in a mass ratio of 1: 0.3: 0.3: 0.2 of hindered amine light stabilizer, triazine ultraviolet absorbent, benzotriazole ultraviolet absorbent and benzophenone ultraviolet absorbent.

A preparation method of an ultraviolet irradiation crosslinking polyolefin material comprises the following preparation steps:

s1: adding a first photoinitiator into polyolefin, uniformly mixing, adding a bonding agent, and uniformly stirring to obtain a first mixture;

s2: uniformly mixing a polymer precursor, a second photoinitiator and a cross-linking agent to form a second mixture;

s3: adding a light stabilizer into the silane coupling agent to enable the light stabilizer to be coated by the silane coupling agent to form a third mixture;

s4: mixing the first mixture with the second mixture under stirring, adding the third mixture under stirring to allow the third mixture to be dispersed between the first mixture and the second mixture, and then mixing at a wavelength of 300nm and a light intensity of 400mW/cm²Under the irradiation of the ultraviolet light, the crosslinking time is 3S, and the crosslinking is finished to form the ultraviolet light irradiation crosslinking polyolefin material.

Example 5

Unlike example 4, the polyolefin of example 5 was prepared from a mixture of, by mass, 1: 0.5 of polyethylene and polypropylene. The concrete steps are as follows: an ultraviolet radiation cross-linked polyolefin material comprises the following components in parts by weight:

43 parts of polyolefin; 3 parts of a first photoinitiator; 10 parts of bonding agent; 22 parts of polymer precursor; 0.5 part of a second photoinitiator; 1 part of a crosslinking agent; 3 parts of a silane coupling agent; 0.05 part of light stabilizer. Wherein the polyolefin is prepared from the following components in a mass ratio of 1: 0.5 of polyethylene and polypropylene; the first photoinitiator is 2, 2-dimethoxy-2-phenylacetophenone; the second photoinitiator is methyl benzoate; the bonding agent is tris (2-methylaziridine) phosphine oxide; the cross-linking agent is polyethylene glycol dimethacrylate; the polymer precursor is methyl methacrylate; the silane coupling agent is vinyl trimethoxy silane; the light stabilizer is prepared from the following components in a mass ratio of 1: 0.3: 0.3: 0.2 of hindered amine light stabilizer, triazine ultraviolet absorbent, benzotriazole ultraviolet absorbent and benzophenone ultraviolet absorbent.

A preparation method of an ultraviolet irradiation crosslinking polyolefin material comprises the following preparation steps:

s1: adding a first photoinitiator into polyolefin, uniformly mixing, adding a bonding agent, and uniformly stirring to obtain a first mixture;

s2: uniformly mixing a polymer precursor, a second photoinitiator and a cross-linking agent to form a second mixture;

s3: adding a light stabilizer into the silane coupling agent to enable the light stabilizer to be coated by the silane coupling agent to form a third mixture;

s4: mixing the first mixture with the second mixture under stirring, adding the third mixture under stirring to allow the third mixture to be dispersed between the first mixture and the second mixture, and then mixing at a wavelength of 300nm and a light intensity of 400mW/cm²Under the irradiation of the ultraviolet light, the crosslinking time is 3S, and the crosslinking is finished to form the ultraviolet light irradiation crosslinking polyolefin material.

Example 6

Unlike example 4, the polyolefin of example 6 was prepared from a mixture of, by mass, 1: 1 of polyethylene and polypropylene. The concrete steps are as follows: an ultraviolet radiation cross-linked polyolefin material comprises the following components in parts by weight:

43 parts of polyolefin; 3 parts of a first photoinitiator; 10 parts of bonding agent; 22 parts of polymer precursor; 0.5 part of a second photoinitiator; 1 part of a crosslinking agent; 3 parts of a silane coupling agent; 0.05 part of light stabilizer. Wherein the polyolefin is prepared from the following components in a mass ratio of 1: 1, polyethylene and polypropylene; the first photoinitiator is 2, 2-dimethoxy-2-phenylacetophenone; the second photoinitiator is methyl benzoate; the bonding agent is tris (2-methylaziridine) phosphine oxide; the cross-linking agent is polyethylene glycol dimethacrylate; the polymer precursor is methyl methacrylate; the silane coupling agent is vinyl trimethoxy silane; the light stabilizer is prepared from the following components in a mass ratio of 1: 0.3: 0.3: 0.2 of hindered amine light stabilizer, triazine ultraviolet absorbent, benzotriazole ultraviolet absorbent and benzophenone ultraviolet absorbent.

A preparation method of an ultraviolet irradiation crosslinking polyolefin material comprises the following preparation steps:

s1: adding a first photoinitiator into polyolefin, uniformly mixing, adding a bonding agent, and uniformly stirring to obtain a first mixture;

s2: uniformly mixing a polymer precursor, a second photoinitiator and a cross-linking agent to form a second mixture;

s3: adding a light stabilizer into the silane coupling agent to enable the light stabilizer to be coated by the silane coupling agent to form a third mixture;

s4: mixing the first mixture with the second mixture under stirring, adding the third mixture under stirring to allow the third mixture to be dispersed between the first mixture and the second mixture, and then mixing at a wavelength of 300nm and a light intensity of 400mW/cm²Under the irradiation of the ultraviolet light, the crosslinking time is 3S, and the crosslinking is finished to form the ultraviolet light irradiation crosslinking polyolefin material.

In the above embodiments, each material is not limited to the above components, and each material may also be composed of other single components or multiple components described in the present invention, and the component parts of each material are not limited to the above parts, and the component parts of each material may also be a combination of other component parts described in the present invention, and are not described herein again.

Comparative example 1

In comparison with example 1, in comparative example 1, no silane coupling agent, that is, a light stabilizer was directly added, and the remaining formulation and preparation method were the same as in example 1.

Comparative example 2

In comparison with example 1, comparative example 2 has no crosslinking agent added, and the remaining formulation and preparation method are the same as those of example 1.

Comparative example 3

In comparison with example 1, comparative example 3 has no bonding agent added and the remaining formulation and preparation method are the same as example 1.

Comparative example 4

In comparison with example 1, the ultraviolet light in comparative example 4 has a wavelength of 600nm and a light intensity of 400mW/cm²The rest of the formulation and the preparation method are the same as in example 1.

Performance testing

The ultraviolet-irradiated crosslinked polyolefin materials obtained in examples 1 to 6 and comparative examples 1 to 4 were subjected to the following performance tests, namely, a crosslinking degree test GB/T18474-2001, a tensile strength GB/T0403-2006, an elongation at break GB/T0403-2006, a heat elongation test GB/T2951-2008, and a heat aging test GB/T2951-2008, and the results are shown below.

TABLE 1

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.