Polyolefin composite modified material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of materials, and particularly relates to a polyolefin composite modified material and a preparation method and application thereof. The polyolefin composite modified material comprises the following components in parts by mass: 60-80 parts of a polyolefin matrix, 18-35 parts of a reinforced composite material and 5 parts of a composite additive, the sum of the mass parts of the polyolefin matrix, the reinforced composite material and the compound additive is 100; wherein the reinforced composite material is composed of glass fibers, carbon fibers and maleic anhydride grafted polyethylene; the compound additive comprises a flame retardant, a lubricant and an antioxidant. The polyolefin composite modified material has excellent mechanical properties and chemical stability, high tensile strength and good corrosion resistance and wear resistance, and can meet the repair requirements under complex working conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of materials, and in particular relates to a polyolefin composite modified material and a preparation method and application thereof. Background Art

[0002] As urban infrastructure ages, underground pipeline systems face increasing demands for repair and replacement. Traditional excavation repair methods are not only time-consuming and labor-intensive, but also have serious impacts on the environment and traffic. Trenchless repair technology has gradually become the mainstream due to its advantages such as simple construction and low environmental impact.

[0003] However, existing trenchless repair materials have deficiencies in strength, corrosion resistance, wear resistance, etc., and are difficult to meet the repair needs under complex working conditions; some also use polyurethane combined with polyester reinforcement solutions with extremely complex production processes, which greatly increases production costs.

[0004] Existing trenchless repair materials have deficiencies in strength, corrosion resistance, wear resistance, etc., and are difficult to meet the repair needs under complex working conditions. In particular, due to insufficient strength, the size of the primary jacking pipe cannot be too long, which greatly prolongs the construction period. Summary of the invention

[0005] The invention develops a polyolefin composite modified material, which is a polyolefin composite modified material obtained by adding a suitable reinforcing material to a polyolefin matrix for modification to obtain a polyolefin composite modified material with good mechanical properties, corrosion resistance and wear resistance.

[0006] In order to achieve the above object, the present invention can adopt the following technical solutions: The present invention provides a polyolefin composite modified material, which comprises the following raw materials, calculated by weight: 60-80 parts of a polyolefin matrix, 18-35 parts of a reinforcing composite material, and 4-6 parts of a composite auxiliary agent, wherein the sum of the weight parts of the polyolefin matrix, the reinforcing composite material, and the composite auxiliary agent is 100 parts; Wherein, the reinforcing composite material is composed of glass fiber, carbon fiber and maleic anhydride grafted polyethylene; The composite auxiliary agent comprises a flame retardant, a lubricant and an antioxidant.

[0007] Preferably, the polyolefin composite modified material comprises the following raw materials in parts by mass: 68.5-74 parts of polyolefin matrix, 21-26.5 parts of reinforcing composite material and 5 parts of composite auxiliary agent, and the sum of the parts by mass of the polyolefin matrix, the reinforcing composite material and the composite auxiliary agent is 100 parts.

[0008] Preferably, the polyolefin composite modified material comprises the following raw materials in parts by mass: 70 parts of polyolefin matrix, 25 parts of reinforcing composite material and 5 parts of composite auxiliary agent.

[0009] Preferably, in the reinforcement composite material, the mass ratio of glass fiber, carbon fiber and maleic anhydride grafted polyethylene is (10-20): (5-10): (3-5).

[0010] Preferably, in the reinforced composite material, the mass ratio of glass fiber, carbon fiber and maleic anhydride grafted polyethylene is 14:7:4.

[0011] Preferably, the composite auxiliary agent includes a flame retardant, a lubricant and an antioxidant.

[0012] Preferably, the mass ratio of the flame retardant, the lubricant and the antioxidant is 2:2:1.

[0013] Preferably, the flame retardant comprises decabromodiphenyl ether and antimony trioxide.

[0014] Preferably, the mass ratio of decabromodiphenyl ether to antimony trioxide is 1.3:0.7.

[0015] Preferably, the lubricant comprises PE wax and molybdenum disulfide.

[0016] Preferably, the mass ratio of the PE wax to molybdenum disulfide is 3:2.

[0017] Preferably, the lubricant includes an antioxidant 1010 .

[0018] Preferably, the polyolefin matrix is ​​high density polyethylene.

[0019] Another aspect of the present invention provides a method for preparing a polyolefin modified composite material, which specifically comprises the following steps: (1) Mix the raw materials according to the above weight parts, stir evenly, and obtain a mixture; (2) The mixed material is placed in an extruder, and under the action of high temperature and high pressure, it is plasticized into a viscous flow state, extruded and drawn, and cooled and granulated to obtain a reinforced polyolefin modified composite material.

[0020] Preferably, in step (2), cooling is performed by cooling water, the flow rate of the cooling water is in the range of 8 t / h to 12 t / h, and the temperature of the cooling water is in the range of 0°C to 10°C.

[0021] Preferably, in step (2), the extruder is a conical twin-screw extruder, and the barrel temperature is 7 zones, and the barrel temperature is distributed from low to high: zone 1 160°C, zone 2 165°C, zone 3 170°C, zone 4 175°C, zone 5 180°C, zone 6 185°C, zone 7 180°C; melt pressure 20MPa~25MPa; feeding speed 8r / min~10r / min.

[0022] In another aspect, the present invention provides a polyolefin modified composite material which can be used in trenchless pipeline repair.

[0023] The beneficial effects of the present invention include at least: (1) The polyolefin modified composite material provided by the present invention has excellent mechanical properties and chemical stability, high tensile strength, good corrosion resistance and wear resistance, and can meet the repair needs under complex working conditions.

[0024] (2) The preparation method of the polyolefin modified composite material provided by the present invention is simple and easy to mass produce.

[0025] (3) The polyolefin modified composite material provided by the present invention is easy and quick to construct, has little impact on the environment, and can significantly improve the efficiency of pipeline repair and reduce the repair cost; the repaired pipeline has a long service life and is safe and reliable. DETAILED DESCRIPTION

[0026] The examples are provided to better illustrate the present invention, but the content of the present invention is not limited to the examples. Therefore, those skilled in the art may make non-essential improvements and adjustments to the implementation scheme according to the above invention content, which still fall within the scope of protection of the present invention. The experimental methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials, unless otherwise specified, can be obtained from commercial channels.

[0027] The terms used herein are only used to describe specific embodiments and are not intended to limit the present disclosure. Unless the context has a significantly different meaning, expressions in the singular include expressions in the plural. As used herein, it should be understood that terms such as "include", "have", "include" are intended to indicate the presence of features, numbers, operations, components, parts, elements, materials or combinations. The terms of the present invention are disclosed in the specification, and are not intended to exclude the possibility that one or more other features, numbers, operations, components, parts, elements, materials or combinations thereof may exist or may be added. As used herein, " / " may be interpreted as "and" or "or", depending on the circumstances.

[0028] The embodiment of the present invention provides a polyolefin modified composite material, which includes the following raw materials, measured by weight: 60 to 80 parts of a polyolefin matrix, 18 to 35 parts of a reinforcing composite material and 5 parts of a composite additive, and the sum of the weight parts of the polyolefin matrix, the reinforcing composite material and the composite additive is 100 parts; wherein the reinforcing composite material is composed of glass fiber, carbon fiber and maleic anhydride grafted polyethylene (PE~g~MAH), and the manufacturer of PE~g~MAH is Zhejiang Kepute New Materials Co., Ltd. (Batch No. P3120240311125).

[0029] In some specific examples, the polyolefin composite modified material includes the following raw materials, calculated by weight: 68.5-74 parts of polyolefin matrix, 21-26.5 parts of reinforcing combination material and 5 parts of composite additive, and the sum of the weight parts of the polyolefin matrix, the reinforcing combination material and the composite additive is 100 parts.

[0030] In some specific examples, the polyolefin composite modified material includes the following raw materials, calculated by weight: 70 parts of polyolefin matrix, 25 parts of reinforcing composite material and 5 parts of composite additive.

[0031] It should be noted that the present invention enhances the mechanical properties and chemical stability of the polyolefin matrix by reinforcing the composite material, and uses maleic anhydride grafted polyethylene to enable the reinforced composite material and the polyolefin matrix to be well blended and bonded, thereby avoiding pseudo-compatibility.

[0032] In addition, the reinforcing composite material is 18 to 35 parts, such as 18 parts, 19.5 parts, 21 parts, 25 parts, 28 parts, 29.5 parts, 32 parts, 33.5 parts or 35 parts, etc. In addition, the composition of glass fiber, carbon fiber and maleic anhydride grafted polyethylene in the reinforcing composite material of the present invention is better than other reinforcing materials, such as reinforcing materials composed of light calcium carbonate and carbon fiber, and reinforcing materials composed of kaolin and carbon fiber.

[0033] In some specific examples, in the above-mentioned polyolefin modified composite material, the mass ratio of glass fiber, carbon fiber, and PE~g~MAH is (10~20): (5~10): (3~5), such as 10:5:3, 11:5.5:3, 12:6:3, 13:6.5:3, 14:7:4, 15:7.5:4, 16:8:4, 17:8.5:4, 18:9:5, 19:9.5:5, 20:10:5. Preferably, 10:5:3, 11:5.5:3, 12:6:3, 13:6.5:3, 14:7:4, and the prepared polyolefin composite modified material has better mechanical properties. The most preferred ratio is 14:7:4.

[0034] In some specific examples, the polyolefin modified composite material comprises, by weight: 70% polyethylene resin, 25% reinforcing composite material and 5% composite additive.

[0035] In some specific examples, in the above-mentioned polyolefin modified composite material, the composite additives include flame retardants, lubricants and antioxidants.

[0036] In some specific examples, in the above-mentioned polyolefin modified composite material, the added amount of the composite auxiliary agent is 4 to 6 parts of the polyolefin composite modified material, such as 4 parts, 4.5 parts, 5 parts, 5.5 parts or 6 parts.

[0037] In some specific examples, in the above composite additive, the mass ratio of the flame retardant, the lubricant and the antioxidant is 2:2:1.

[0038] In some specific examples, the flame retardant includes decabromodiphenyl ether and antimony trioxide.

[0039] In some specific examples, in the flame retardant, the mass ratio of decabromodiphenyl ether to antimony trioxide is 1.3:0.7.

[0040] In some specific examples, the lubricant includes PE wax and molybdenum disulfide.

[0041] In some specific examples, in the above lubricant, the mass ratio of PE wax to molybdenum disulfide is 3:2.

[0042] In some specific examples, the antioxidant includes antioxidant 1010 .

[0043] In some specific examples, the polyolefin matrix is ​​high-density polyethylene (HDPE).

[0044] The present invention also provides a method for preparing a polyolefin modified composite material, which specifically comprises the following steps: (1) Mix the raw materials according to the above weight parts, stir evenly, and obtain a mixture; (2) The mixed material is placed in an extruder, and under the action of high temperature and high pressure melting, the mixed material is plasticized into a viscous flow state, extruded and drawn, and cooled and granulated to obtain a reinforced polyolefin modified composite material; the extruder is a conical twin-screw extruder, and the barrel temperature is 7 zones, and the barrel temperature is distributed from low to high: zone 1 160°C, zone 2 165°C, zone 3 170°C, zone 4 175°C, zone 5 180°C, zone 6 185°C, zone 7 180°C; the main machine current is 50A~55A; the melt pressure is 20MPa~25MPa; the feed speed is 8r / min~10r / min; cooling water is used for cooling and granulation, the flow range of cooling water is 8t / h~12t / h, and the temperature range of cooling water is 0℃~10℃.

[0045] An embodiment of the present invention also provides an application of a polyolefin modified composite material in trenchless pipeline repair.

[0046] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with specific examples, but the content of the present invention is not limited to the following examples.

[0047] 1. Preparation of polyolefin composite modified materials The steps are as follows: (1) mixing the raw materials according to the above weight parts, stirring evenly, and obtaining a mixed material; (2) The mixed material is placed in an extruder, and under the action of high temperature and high pressure melting, the mixed material is plasticized into a viscous flow state, and then extruded and drawn, and cooled and granulated. The extruder is a conical twin-screw extruder, and the barrel temperature is 7 zones, and the barrel temperature is distributed from low to high: zone 1 160°C, zone 2 165°C, zone 3 170°C, zone 4 175°C, zone 5 180°C, zone 6 185°C, zone 7 180°C; the main machine current is 50A~55A; the melt pressure is 20MPa~25MPa; the feed speed is 8r / min~10r / min; cooling and granulation are performed by cooling water, the flow rate of cooling water ranges from 8t / h~12t / h, and the temperature range of cooling water is 0℃~10℃, so as to obtain a reinforced polyolefin modified composite material; the reinforced polyolefin modified composite material is observed by naked eyes, and the obtained polyolefin modified composite material has a smooth and flat appearance without burrs.

[0048] Example 1 to Example 11 The raw materials of Examples 1 to 11 are arranged according to the following Table 1: the total weight of polyethylene resin, reinforcing composite material and composite auxiliary agent is 100 parts, and different reinforced polyolefin materials are prepared according to the above method.

[0049] Table 1 Example 1 to Example 11

[0050] Comparative Example 1 to Comparative Example 10 The raw materials of Comparative Examples 1 to 10 are arranged according to the following Table 2, the total weight of the polyethylene resin, the combined material and the composite auxiliary agent is 100 parts, and different polyolefin materials are prepared according to the above method.

[0051] Table 2 Comparative Examples 1 to 10

[0052] 2. Performance test of polyolefin composite modified materials The tensile strength and elongation at break of the reinforced polyolefin materials prepared in Examples 1 to 11 and Comparative Examples 1 to 10 were tested according to the standard "GB / T1040"; the flexural modulus of the reinforced polyolefin materials prepared in Examples 1 to 11 and Comparative Examples 1 to 10 were tested according to the standard "GB / T9341"; the cantilever beam notched impact strength of the reinforced polyolefin materials prepared in Examples 1 to 11 and Comparative Examples 1 to 10 was tested according to the standard "GB / T1843"; the test results are shown in Table 3 below.

[0053] Table 3 Performance of Examples 1 to 11 and Comparative Examples 1 to 10

[0054] As can be seen from Table 3, the reinforced polyolefin modified composite materials prepared in Examples 1 to 11 of the present invention are compared with the polyolefin modified composite material formulas of Comparative Examples 1 to 10. The strength of the reinforced polyolefin modified composite materials in the embodiments of the present invention is greatly improved, and the toughness is also improved to a certain extent; in the comparative example, light calcium carbonate and carbon fiber are used as a combination material: although there is a certain reinforcement effect, due to the relatively poor compatibility of light calcium carbonate, it cannot be well melted with the carbon fiber, and light calcium carbonate and carbon fiber are used as a combination material: although there is a certain reinforcement effect, due to the looseness of kaolin, the compatibility with carbon fiber is poor, and it cannot be well melted with the carbon fiber, and thus the strength of the polyolefin modified composite material is still weak; the strength of the reinforced polyolefin modified composite material in the embodiment of the present invention is improved because the toughness of the combination of carbon fiber and glass fiber is much greater than that of conventional reinforcing materials, and at the same time, because maleic anhydride grafted polyethylene, carbon fiber and glass fiber are coordinated in the reinforced combination material, the reinforcing material and the main raw material can be well blended and bonded, avoiding the false compatibility phenomenon, thereby further improving the strength of the reinforced polyolefin modified composite material.

[0055] In addition, adding antimony trioxide flame retardant additive to the additive can promote the combination of reinforcing materials and main raw materials, and improve the acid and alkali resistance of reinforced polyolefin modified composite materials; and adding molybdenum disulfide lubricant to the additive can promote the combination of reinforcing materials and main raw materials, and improve the wear resistance of reinforced polyolefin modified composite materials, so that the strong polyolefin modified composite materials have good chemical stability.

[0056] In summary, the polyolefin modified composite material provided by the present invention has excellent mechanical properties and chemical stability, high tensile strength, and can meet the repair needs under complex working conditions; the polyolefin modified composite material is simple and quick to construct, has little impact on the environment, can significantly improve the pipeline repair efficiency and reduce the repair cost; the repaired pipeline has a long service life and is safe and reliable.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be covered by the scope of the claims of the present invention.

Claims

1. A polyolefin composite modified material, characterized in that: The following raw materials are included in parts by weight: 60-80 parts of a polyolefin matrix, 18-35 parts of a reinforcing composite material and 5 parts of a composite additive; and the sum of the parts by weight of the polyolefin matrix, the reinforcing composite material and the composite additive is 100 parts; Wherein, the reinforcing composite material is composed of glass fiber, carbon fiber and maleic anhydride grafted polyethylene; The composite auxiliary agent comprises a flame retardant, a lubricant and an antioxidant.

2. The polyolefin composite modified material according to claim 1, characterized in that: The polyolefin composite modified material includes the following raw materials in parts by mass: 68.5-74 parts of a polyolefin matrix, 21-26.5 parts of a reinforcing composite material and 5 parts of a composite auxiliary agent, and the sum of the parts by mass of the polyolefin matrix, the reinforcing composite material and the composite auxiliary agent is 100 parts.

3. The polyolefin composite modified material according to claim 1, characterized in that: The polyolefin composite modified material comprises the following raw materials in parts by mass: 70 parts of a polyolefin matrix, 25 parts of a reinforcing composite material and 5 parts of a composite auxiliary agent.

4. The polyolefin composite modified material according to any one of claims 1 to 3, characterized in that: In the reinforced composite material, the mass ratio of glass fiber, carbon fiber and maleic anhydride grafted polyethylene is (10~20): (5~10): (3~5).

5. The polyolefin composite modified material according to claim 4, characterized in that: In the reinforced composite material, the mass ratio of glass fiber, carbon fiber and maleic anhydride grafted polyethylene is 14:7:

4.

6. The polyolefin composite modified material according to claim 1, characterized in that: In the composite auxiliary agent, the mass ratio of the flame retardant, the lubricant and the antioxidant is 2:2:

1.

7. The polyolefin composite modified material according to claim 5 or 6, characterized in that: The flame retardant includes decabromodiphenyl ether and antimony trioxide; the lubricant includes PE wax and molybdenum disulfide.

8. The polyolefin composite modified material according to claim 1, characterized in that: The polyolefin matrix is ​​high-density polyethylene.

9. A method for preparing a polyolefin composite modified material according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) Mix the raw materials according to the above weight parts, stir evenly, and obtain a mixture; (2) placing the mixed material in an extruder, and plasticizing it into a viscous flow state under high temperature and high pressure, and then extruding and drawing, cooling and granulating, to obtain a reinforced polyolefin modified composite material; In step (2), the extruder is a conical twin-screw extruder, and the barrel temperature is 7 zones, and the barrel temperature is distributed from low to high: zone 1 160°C, zone 2 165°C, zone 3 170°C, zone 4 175°C, zone 5 180°C, zone 6 185°C, zone 7 180°C; melt pressure 20MPa~25MPa; feed speed 8r / min~10r / min; cooling by cooling water, the cooling water flow range is 8t / h~12t / h, and the cooling water temperature range is 0°C~10°C.

10. An application of a polyolefin composite modified material, characterized in that: The polyolefin composite modified material described in any one of claims 1 to 8 is used in trenchless pipeline repair.

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