Medium conveying layer soft material for plastic rib composite pipeline as well as preparation method and application of medium conveying layer soft material

Abstract

The invention discloses a medium conveying layer soft material for a plastic rib composite pipeline as well as a preparation method and application of the medium conveying layer soft material. The medium conveying layer soft material consists of a component A and a component B, wherein the component A is prepared from the following components in parts by weight: 15.0 to 25.0 parts of polypropylene, 20.0 to 30.0 parts of ethylene propylene diene monomer, 10.0 to 15.0 parts of SEBS (Styrene-Ethylene-Butylene-Styrene), 30.0 to 40.0 parts of plasticizing oil, 10.0 to 15.0 parts of calcium powder A, 0.2 to 0.5 part of cross-linking agent A, 0.2 to 0.4 part of accelerant, 4.0 to 7.0 parts of functional additive and 1.0 to 1.2 parts of color master batch; the component B is prepared from the following components in parts by weight: 50.0 to 60.0 parts of POE (Polyolefin Elastomer), 40.0 to 50.0 parts of TPO (Thermoplastic Polyolefin), 10.0 to 15.0 parts of calcium powder B, 0.2 to 0.5 part of cross-linking agent B and 2.0 to 3.0 parts of POE-g-MAH (Polyolefin Elastomer-g-MAH).

Description

Technical Field

[0001] The invention relates to the technical field of composite pipes, and in particular to a medium transport layer soft material for a plastic reinforced composite pipe, and a preparation method and application thereof. Background Art

[0002] At present, the medium transport layer materials (soft materials) used in existing plastic reinforced composite pipes are mostly TPU materials, and the hard rib materials used are mostly PVC materials. However, due to the characteristics of the materials, PVC and TPU materials have weak acid and alkali resistance. When transporting corrosive media for a long time, the performance of plastic reinforced composite pipes will drop rapidly, causing hidden dangers in use; at the same time, PVC and TPU materials have average low temperature resistance, and the extreme brittle temperature is around -40℃. Under normal circumstances, they can only be used normally in a climate environment of around -10℃, and cannot be used safely in some extremely cold areas.

[0003] In addition, some EPDM / PP TPV materials currently developed on the market are mostly used to manufacture sealing strips, such as glass edge sealing, engine hood sealing strips, door sealing strips, and car foam sealing strips, etc. However, due to the good weather resistance and aging resistance of TPV materials, they are also widely used in electronic communications, wires and cables, and composite pipes (that is, EPDM / PP TPV materials can be used as soft materials in composite pipes). Its excellent elasticity and resistance to compression deformation make it have a wide range of application prospects in the field of industrial equipment and can meet the use requirements in various complex environments. However, due to the poor bonding ability of traditional EPDM / PP TPV materials with hard rib materials such as PVC due to their material properties, they have to improve and optimize the bonding index with hard rib materials when used in plastic rib composite pipes.

[0004] In summary, the soft materials of existing plastic reinforced composite pipes can generally be selected from TPU materials or EPDM / PP type TPV materials, but both materials have corresponding problems. Summary of the invention

[0005] The purpose of the present invention is to develop a medium transport layer soft material for plastic reinforced composite pipes to address the problems of weak acid and alkali resistance and poor low temperature resistance of TPU soft materials for existing plastic reinforced composite pipes, and the problem of poor adhesion between traditional EPDM / PP type TPV soft materials and PVC hard rib materials after being used for composite pipes. When the medium transport layer soft material is used together with the hard rib material to prepare the plastic reinforced composite pipe, the problems faced by the existing TPU soft material and the traditional EPDM / PP type TPV soft material can be overcome.

[0006] To achieve the above object, the present invention is implemented by the following technical solutions:

[0007] The present invention provides a medium transport layer soft material for a plastic reinforced composite pipe, the medium transport layer soft material consists of component A and component B;

[0008] Wherein, the component A comprises the following components in parts by weight:

[0009] Polypropylene 15.0-25.0 parts, EPDM rubber 20.0-30.0 parts, SEBS 10.0-15.0 parts, plasticizer oil 30.0-40.0 parts, calcium powder A 10.0-15.0 parts, crosslinking agent A 0.2-0.5 parts, accelerator 0.2-0.4 parts, functional additives 4.0-7.0 parts and masterbatch 1.0-1.2 parts;

[0010] The component B comprises the following components in parts by weight:

[0011] POE 50.0-60.0 parts, TPO 40.0-50.0 parts, calcium powder B 10.0-15.0 parts, crosslinking agent B 0.2-0.5 parts, and POE-g-MAH 2.0-3.0 parts.

[0012] Furthermore, a medium transport layer soft material for a plastic reinforced composite pipe: the polypropylene is selected from Shanghai Petrochemical M250E polypropylene PP, with a melt index of 2.5g / 10min, a yield strength of 28MPa, and a bending modulus of 800MPa; the ethylene content of the EPDM rubber is 60-65%, the ENB content is 4.0-5.0%, and the Mooney viscosity ML 1+4 (125°C) of the EPDM rubber is 60-65; the SEBS is selected from SEBS 7551U, with a specific gravity of 0.91g / cm 3 , ash content 0.05%, of which styrene content is 30-35%.

[0013] Furthermore, a medium transport layer soft material for a plastic-reinforced composite pipeline: the plasticizing oil is light-colored paraffin oil with a viscosity of 72 mPa·s (40°C), a flash point of 266, and a specific gravity of 0.867; the calcium powder A and calcium powder B are both light calcium carbonate of 400-800 mesh, with a pH value of 8.5-9.5, a whiteness of 93, and a sand content of 0.001; the crosslinking agent A and the crosslinking agent B are both bifunctional peroxide 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.

[0014] Furthermore, a medium transport layer soft material for a plastic reinforced composite pipe: the accelerator is HVA-2; the functional additive is one or more of antioxidant 1010, antioxidant 168, and antioxidant MIANOX300; and the masterbatch is Plasblak LL2590.

[0015] Furthermore, a medium transport layer soft material for a plastic reinforced composite pipe: the POE selected is POE Exxon 6102; the TPO selected is TPO Basell Q300F; the MAH grafting rate of the POE-g-MAH is 1.0-1.3%, and its melt index is 0.6-2.0g / 10min (190°C, 2.16kg).

[0016] Furthermore, a medium transport layer soft material for a plastic reinforced composite pipe: the weight ratio of component A to component B is 10:(2-4).

[0017] The present invention also provides a method for preparing a medium transport layer soft material for a plastic reinforced composite pipeline, the method comprising the following steps:

[0018] 1. Preparation of component A:

[0019] S1. First, EPDM rubber, plasticizer oil and calcium powder A are mixed evenly to form a mixed material A for standby use;

[0020] S2, polypropylene, SEBS, functional additives, and masterbatch are uniformly mixed to form a mixed material B for standby use;

[0021] S3, mixing the crosslinking agent A and the accelerator evenly to form a mixed material C for standby use;

[0022] S4, feeding the above-mentioned mixed material A, mixed material B and mixed material C into a twin-screw extruder in sequence, and performing extrusion granulation to obtain component A;

[0023] Among them, the co-rotating twin-screw extrusion temperature is set as follows: zone 1 temperature 145 ~ 210 ° C, zone 2 temperature 145 ~ 210 ° C, zone 3 temperature 145 ~ 210 ° C, zone 4 temperature 145 ~ 210 ° C, zone 5 temperature 145 ~ 210 ° C, zone 6 temperature 145 ~ 210 ° C, zone 7 temperature 145 ~ 210 ° C, zone 8 temperature 145 ~ 210 ° C, zone 9 temperature 145 ~ 210 ° C, die head 145 ~ 210 ° C;

[0024] 2. Preparation of component B:

[0025] S1. Evenly mix POE, TPO and calcium powder B to form a mixed material D for standby use;

[0026] S2, the crosslinking agent B and POE-g-MAH are mixed evenly to form a mixed material E, which is set aside;

[0027] S3, feeding the above-mentioned mixed material D and mixed material E into a twin-screw extruder in sequence, and performing extrusion granulation to obtain component B;

[0028] Among them, the co-rotating twin-screw extrusion temperature is set as follows: zone 1 temperature 145 ~ 210 ° C, zone 2 temperature 145 ~ 210 ° C, zone 3 temperature 145 ~ 210 ° C, zone 4 temperature 145 ~ 210 ° C, zone 5 temperature 145 ~ 210 ° C, zone 6 temperature 145 ~ 210 ° C, zone 7 temperature 145 ~ 210 ° C, zone 8 temperature 145 ~ 210 ° C, zone 9 temperature 145 ~ 210 ° C, die head 145 ~ 210 ° C;

[0029] 3. Preparation of soft material for medium transport layer:

[0030] Component A and component B are mixed in proportion and added into an extruder for melt extrusion to obtain a medium transport layer soft material.

[0031] The present invention also provides a use of a medium transport layer soft material for a plastic-reinforced composite pipe, wherein the above-mentioned medium transport layer soft material is used together with a hard rib material to prepare a plastic-reinforced composite pipe; and the plastic-reinforced composite pipe comprises: a pipe body and ribs wrapped around the outside of the pipe body; wherein the material of the pipe body is the medium transport layer soft material, and the material of the ribs is the hard rib material.

[0032] Further, a use of a medium transport layer soft material for a plastic reinforced composite pipe: the production method of the plastic reinforced composite pipe is:

[0033] (1) co-extruding the medium transport layer soft material and the hard rib material through an extruder to obtain a molten winding strip;

[0034] (2) The extruded winding strips are overlapped and wound by a spiral winding unit, cooled and shaped to obtain a plastic-reinforced composite pipe.

[0035] Furthermore, a use of a soft material for a medium transport layer for a plastic-reinforced composite pipe: the weight ratio of the soft material for the medium transport layer to the hard rib material is 10:(3-5).

[0036] Terminology explanation:

[0037] Plastic reinforced composite pipe: The composite pipe referred to here is a plastic reinforced water suction pipe, also known as a spiral water suction pipe or a fire water suction hose. Its structure is composed of a soft elastomer wrapped with a hard rib material with certain strength and physical and chemical properties.

[0038] The medium transport layer soft material provided by the present invention is also a TPV soft material based on EPDM / PP, which can be used to produce the medium transport layer of plastic-reinforced composite pipes, and is produced by extrusion equipment and extruded and overlapped with hard rib materials to form a composite pipe application.

[0039] The EPDM / PP type thermoplastic dynamically vulcanized rubber TPV soft material of the present invention has environmental resistance equivalent to that of general-purpose ethylene propylene diene monomer (EPDM) rubber, and its oil and solvent resistance is comparable to that of general-purpose chloroprene rubber. Such a unique combination of excellent environmental resistance makes the thermoplastic rubber of the present invention suitable for a wide range of uses.

[0040] The medium transport layer soft material provided by the present invention has the following characteristics: (1) the touch of rubber and the processing method of plastic; (2) good mechanical properties in an environment of -55°C to 150°C; (3) oil resistance and solvent resistance of chloroprene rubber grade to water-based liquids, oils and hydrocarbons; (4) small compression deformation and permanent deformation; (5) long-term exposure to 150°C, showing its excellent resistance to hot air aging; (6) excellent dynamic fatigue resistance; (7) high tear strength; (8) excellent ozone resistance and weather resistance.

[0041] Beneficial effects of the present invention:

[0042] (1) After the medium transport layer soft material of the present invention is used in the composite pipeline, the high and low temperature resistance and chemical resistance of the pipeline medium transport layer can be significantly improved, and it can be used in extremely cold or hot application scenarios, making up for the vacancy of the original product in application fields other than fire protection, especially making up for the use requirements of scenarios with more severe working conditions (such as outdoor use in extremely cold mountainous areas or use in hot desert areas) and more complex transport media (such as higher temperature requirements and the need for heat-resistant, hydrolysis-resistant, and chemically corrosive media).

[0043] (2) Compared with TPU material, the medium transport layer soft material of the present invention has better low temperature resistance, so that the composite pipeline can maintain normal use in extremely cold climate environments, and has more significant chemical resistance, and can withstand special media such as brine, fracturing return water, manure, etc., making the pipeline transportation range wider and safer, and will not cause safety hazards due to the degradation of material corrosive properties.

[0044] (3) After the medium transport layer soft material of the present invention is used in the composite pipe, it can be firmly bonded with the hard rib material, solving the problem of poor bonding ability between the traditional EPDM / PP type TPV material and the hard rib material.

[0045] (4) The plastic reinforced composite pipe prepared by using the medium transport layer soft material of the present invention has higher low temperature resistance, more significant chemical resistance and hydrolysis resistance, a wider medium transport temperature range, stable material performance, and a more comprehensive product application and transport field. The raw material production process of the overall composite pipeline system is more convenient and efficient, while energy-saving and environmentally friendly, and is conducive to mass production and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0047] Figure 1 This is a schematic diagram of the structure of the plastic-reinforced composite pipe produced in Example 1 of the present invention.

[0048] Markings in the figure: 1-tube body, 2-ribs. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Example 1

[0051] This embodiment 1 provides a medium transport layer soft material for a plastic reinforced composite pipe, the medium transport layer soft material is composed of component A and component B in a weight ratio of 10:3;

[0052] Wherein, the component A comprises the following components in parts by weight:

[0053] 15.0 parts of polypropylene (PP), 20.0 parts of ethylene propylene diene monomer (EPDM), 10.0 parts of SEBS, 30.0 parts of plasticizer oil, 10.0 parts of calcium powder A, 0.2 parts of crosslinking agent A, 0.2 parts of accelerator, 4.0 parts of functional additives and 1.0 parts of masterbatch;

[0054] The polypropylene is Shanghai Petrochemical M250E polypropylene PP, with a melt index of 2.5g / 10min, a yield strength of 28MPa, and a flexural modulus of 800MPa; the ethylene content of the EPDM rubber is 60-65%, the ENB content is 4.0-5.0%, and the Mooney viscosity ML 1+4 (125°C) is 61; the SEBS is SEBS 7551U, with a specific gravity of 0.91g / cm 3, ash content 0.05%, of which styrene content 30-35%; the plasticizer oil is light paraffin oil, with a viscosity of 72mPa·s (40℃), a flash point of 266, and a specific gravity of 0.867; the calcium powder A is a light calcium carbonate of 400-800 mesh, with a pH of about 9, a whiteness of 93, and a sand content of 0.001; the crosslinking agent A is a bifunctional peroxide 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane; the accelerator is HVA-2, with a melting point ≥195℃, a heating loss ≤0.5%, and an ash content ≤0.5%; the functional additive is an antioxidant MIANOX300; the masterbatch is Plasblak LL2590, with a carbon black content of 40% and a density of 1150kg / m 3 ;

[0055] Wherein, the component B comprises the following components in parts by weight:

[0056] 50.0 parts of POE, 40.0 parts of TPO, 10.0 parts of calcium powder B, 0.2 parts of crosslinking agent B, and 2.0 parts of POE-g-MAH;

[0057] The POE selected is POE Exxon 6102, whose melt index (190℃ / 2.16kg) is 1.5g / 10min, hardness is 66A, and tensile strength is greater than 6.5MPa; the TPO selected is TPO Basel Q300F, whose melt index (230℃ / 2.16kg) is 0.8g / 10min, hardness is 36D, and tensile strength is greater than 12MPa; the calcium powder B selected is light calcium carbonate of 400-800 mesh, whose p H is about 9, whiteness is 93, and sand content is 0.001; the crosslinking agent B is selected from bifunctional peroxide 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane; the accelerator is selected from HVA-2, whose melting point is ≥195°C, heating loss is ≤0.5%, and ash content is ≤0.5%; the MAH grafting rate of the POE-g-MAH is 1.0-1.3%, and its melt index (190°C / 2.16kg) is 0.6-2.0g / 10min.

[0058] Preparation: The method for preparing the medium transport layer soft material for the plastic reinforced composite pipe in Example 1 comprises the following specific steps:

[0059] 1. Preparation of component A:

[0060] S1. According to weight, EPDM, plasticizer oil and calcium powder A are mixed at 400 rpm in a high-speed mixer at 90° C. for 20 minutes to form a mixed material A for standby use;

[0061] S2, polypropylene (PP), SEBS, functional additives, and masterbatch were mixed at a high speed of 400 rpm in a high-speed mixer at 90° C. for 20 minutes to form a mixed material B for standby use;

[0062] S3, mixing the crosslinking agent A and the accelerator in a high-speed mixer at 90° C. at a speed of 400 rpm for 20 minutes to form a mixed material C for standby use;

[0063] S4, feeding the above-mentioned mixed material A, mixed material B and mixed material C into a twin-screw extruder in sequence, and performing extrusion granulation to obtain component A;

[0064] Among them, the co-rotating twin-screw extrusion temperature is set as follows: zone 1 temperature 145 ~ 210 ° C, zone 2 temperature 145 ~ 210 ° C, zone 3 temperature 145 ~ 210 ° C, zone 4 temperature 145 ~ 210 ° C, zone 5 temperature 145 ~ 210 ° C, zone 6 temperature 145 ~ 210 ° C, zone 7 temperature 145 ~ 210 ° C, zone 8 temperature 145 ~ 210 ° C, zone 9 temperature 145 ~ 210 ° C, die head 145 ~ 210 ° C;

[0065] 2. Preparation of component B:

[0066] S1, POE, TPO and calcium powder B are mixed at a high speed of 400 rpm in a high-speed mixer at 90° C. for 20 minutes to form a mixed material D for standby use;

[0067] S2, the crosslinking agent B and POE-g-MAH were mixed at a high speed of 400 rpm in a high mixer at 90° C. for 20 minutes to form a mixed material E for standby use;

[0068] S3, feeding the above-mentioned mixed material D and mixed material E into a twin-screw extruder in sequence, and performing extrusion granulation to obtain component B;

[0069] Among them, the co-rotating twin-screw extrusion temperature is set as follows: zone 1 temperature 145 ~ 210 ° C, zone 2 temperature 145 ~ 210 ° C, zone 3 temperature 145 ~ 210 ° C, zone 4 temperature 145 ~ 210 ° C, zone 5 temperature 145 ~ 210 ° C, zone 6 temperature 145 ~ 210 ° C, zone 7 temperature 145 ~ 210 ° C, zone 8 temperature 145 ~ 210 ° C, zone 9 temperature 145 ~ 210 ° C, die head 145 ~ 210 ° C;

[0070] 3. Preparation of soft material for medium transport layer:

[0071] Component A and component B are mixed in a weight ratio of 10:3 and added into an extruder for melt extrusion to obtain a medium transport layer soft material.

[0072] Application: The soft material of the medium transport layer obtained in Example 1 and the hard rib material (Sinopec S-1000PVC) are mixed in a weight ratio of 10:4 to prepare a plastic rib composite pipe. The specific preparation process is as follows:

[0073] (1) The medium transport layer soft material of Example 1 and the hard rib material (Sinopec S-1000PVC) are co-extruded through an extruder to obtain a molten winding strip;

[0074] (2) The winding strips are overlapped and wound by a spiral winding unit, cooled and shaped to obtain a plastic reinforced composite pipe, the structure of which is as follows: Figure 1 shown.

[0075] Example 2

[0076] This embodiment 2 provides a medium transport layer soft material for a plastic reinforced composite pipe, the medium transport layer soft material is composed of component A and component B in a weight ratio of 10:4;

[0077] Wherein, the component A comprises the following components in parts by weight:

[0078] Polypropylene (PP) 20.0 parts, ethylene propylene diene monomer (EPDM) 25.0 parts, SEBS 12.0 parts, plasticizer oil 34.0 parts, calcium powder A 13.0 parts, crosslinking agent A 0.4 parts, accelerator 0.3 parts, functional additives 5.0 parts and masterbatch 1.1 parts;

[0079] Wherein, the component B comprises the following components in parts by weight:

[0080] 55.0 parts of POE, 44.0 parts of TPO, 13.0 parts of calcium powder B, 0.3 parts of crosslinking agent B, and 2.3 parts of POE-g-MAH.

[0081] The difference between the above-mentioned Example 2 and Example 1 is that the content of each component in Example 2 is different from that in Example 1, and the rest is the same.

[0082] Application: The medium transport layer soft material obtained in Example 2 and the hard rib material (Sinopec S-1000PVC) are mixed in a weight ratio of 10:5 to prepare a plastic-reinforced composite pipe.

[0083] Example 3

[0084] This embodiment 3 provides a medium transport layer soft material for a plastic reinforced composite pipe, the medium transport layer soft material is composed of component A and component B in a weight ratio of 10:2;

[0085] Wherein, the component A comprises the following components in parts by weight:

[0086] 24.0 parts of polypropylene (PP), 30.0 parts of ethylene propylene diene monomer (EPDM), 14.0 parts of SEBS, 38.0 parts of plasticizer oil, 15.0 parts of calcium powder A, 0.4 parts of crosslinking agent A, 0.5 parts of accelerator, 7.0 parts of functional additives and 1.2 parts of masterbatch;

[0087] The polypropylene is Shanghai Petrochemical M250E polypropylene PP, with a melt index of 2.5g / 10min, a yield strength of 28MPa, and a flexural modulus of 800MPa; the ethylene content of the EPDM rubber is 60-65%, the ENB content is 4.0-5.0%, and the Mooney viscosity ML 1+4 (125°C) is 61; the SEBS is SEBS 7551U, with a specific gravity of 0.91g / cm 3 , ash content 0.05%, of which styrene content is 30-35%; the plasticizer oil is light paraffin oil, with a viscosity of 72mPa·s (40℃), a flash point of 266, and a specific gravity of 0.867; the calcium powder A is a light calcium carbonate of 400-800 mesh, with a pH of about 9, a whiteness of 93, and a sand content of 0.001; the crosslinking agent A is a bifunctional peroxide 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane; the accelerator is HVA-2, with a melting point of ≥195℃, a heating loss of ≤0.5%, and an ash content of ≤0.5%; the functional additive is a mixture of antioxidant 1010, antioxidant 168, and antioxidant MIANOX300; the masterbatch is Plasblak LL2590, with a carbon black content of 40% and a density of 1150kg / m 3 ;

[0088] Wherein, the component B comprises the following components in parts by weight:

[0089] POE 59.0 parts, TPO 48.0 parts, calcium powder B14.0 parts, crosslinking agent B 0.5 parts, and POE-g-MAH 3.0 parts;

[0090] The POE selected is POE Exxon 6102, whose melt index (190℃ / 2.16kg) is 1.5g / 10min, hardness is 66A, and tensile strength is greater than 6.5MPa; the TPO selected is TPO Basel Q300F, whose melt index (230℃ / 2.16kg) is 0.8g / 10min, hardness is 36D, and tensile strength is greater than 12MPa; the calcium powder B selected is light calcium carbonate of 400-800 mesh, whose p H is about 9, whiteness is 93, and sand content is 0.001; the crosslinking agent B is selected from bifunctional peroxide 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane; the accelerator is selected from HVA-2, whose melting point is ≥195°C, heating loss is ≤0.5%, and ash content is ≤0.5%; the MAH grafting rate of the POE-g-MAH is 1.0-1.3%, and its melt index (190°C / 2.16kg) is 0.6-2.0g / 10min.

[0091] Application: The medium transport layer soft material obtained in Example 3 and the hard rib material (Sinopec S-1000PVC) are mixed in a weight ratio of 10:3 to prepare a plastic rib composite pipe.

[0092] Comparative Example 1

[0093] Thermoplastic TPU elastomer soft material (Meirui New Materials Polyether 85A thermoplastic TPU) and hard rib material (Sinopec S-1000PVC) are mixed in a weight ratio of 10:3 to prepare a plastic-reinforced composite pipe. The preparation process of the plastic-reinforced composite pipe in Comparative Example 1 is the same as that in Example 3.

[0094] Comparative Example 2

[0095] The traditional EPDM / PP TPV soft material (Celanese 8221-55M300) and the hard rib material (Sinopec S-1000PVC) were mixed in a weight ratio of 10:3 to prepare a plastic-reinforced composite pipe. The preparation process of the plastic-reinforced composite pipe in Comparative Example 2 was the same as that in Example 3.

[0096] Test: Various performance tests were conducted on the plastic reinforced composite pipes obtained in the above Examples 1 to 3 and Comparative Examples 1 to 2. The test results are shown in the following table:

[0097]

[0098] Note: The qualified judgment standard of "high temperature negative pressure" in the above table is: the plastic reinforced composite pipe has no shrinkage or cracking phenomenon, and the unqualified judgment standard is: the plastic reinforced composite pipe has shrinkage or cracking phenomenon;

[0099] The qualified judgment standard of "normal temperature negative pressure" is: the plastic reinforced composite pipe has no suction, shrinkage or cracking phenomenon; the unqualified judgment standard is: the plastic reinforced composite pipe has suction, shrinkage or cracking phenomenon;

[0100] The qualified judgment standard of "low temperature performance" is: after a 15 cm short sample of plastic reinforced composite pipe is kept in a -60℃ constant temperature box for 24 hours, it is dropped vertically from a vertical height of 1.5m for 3 times without any cracking; the unqualified judgment standard is: after a 15 cm short sample of plastic reinforced composite pipe is kept in a -60℃ constant temperature box for 24 hours, it is dropped vertically from a vertical height of 1.5m for 3 times and cracking occurs;

[0101] The qualified judgment standard of "bursting pressure" is: the positive pressure bursting pressure of plastic reinforced composite pipe is greater than 9kg, and the unqualified judgment standard is: the positive pressure bursting pressure of plastic reinforced composite pipe is less than 9kg;

[0102] The specific process of "determination of acid and alkali resistance of medium transport layer material" is as follows: after the soft material of the medium transport layer is made into a standard dumbbell test piece by an injection molding machine, the acid and alkali resistance of the material is determined by comparing the data obtained under the following conditions with the original data: ① Soak in a hydrochloric acid solution with a pH of 1 at 60°C for 14 days, take out to observe the corrosion phenomenon, and do a tensile stress / elongation at break (break) test, refer to ISO 1184:1983; ② Soak in a sodium hydroxide solution with a pH of 14 at 60°C for 14 days, take out to observe the corrosion phenomenon, and do a tensile stress / elongation at break (break) test, refer to ISO 1184:1983.

[0103] It can be seen from the test results in the "Low Temperature Performance" column in the above table that the present invention can greatly improve the low temperature resistance of the composite pipe by improving the formula of the soft material of the medium transport layer, and can be used normally in a low temperature environment as low as -60°C, which greatly improves the low temperature resistance of the plastic reinforced composite pipe and can be used in extremely cold and harsh working conditions.

[0104] It can be seen from the acid and alkali resistance test results of Examples 1 to 3 and Comparative Example 1 in the above table that the tensile stress / elongation at break test data of Examples 1 to 3 are less reduced (about 5%) than the original data, while the reduction in Comparative Example 1 is about 26%. This shows that the soft material of the medium transport layer of the present invention has better acid and alkali resistance. Therefore, when the soft material of the medium transport layer of the present invention is used in the plastic reinforced composite pipe, the chemical resistance of the pipe can be significantly improved.

[0105] From the test results of Examples 1 to 3 and Comparative Example 2 in the "Rib Bonding Strength" column in the above table, it can be seen that the present invention can significantly improve the bonding strength between the soft material of the medium transport layer and the hard rib material by improving the formula of the soft material of the medium transport layer.

[0106] In summary, the plastic-reinforced composite pipe prepared with the medium transport layer soft material of the present invention has better low-temperature resistance and significant chemical resistance, a wider medium transport temperature range, and stable material properties, making the application and transportation fields of the plastic-reinforced composite pipe more comprehensive, and the raw material production process of the overall composite pipe system is more convenient and efficient, while also energy-saving and environmentally friendly, and conducive to mass production and application.

[0107] The above are preferred embodiments of the present invention and are only used to explain the present invention, not to limit the present invention. Any obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A medium transport layer soft material for a plastic reinforced composite pipe, characterized in that: The medium transport layer soft material is composed of component A and component B; Wherein, the component A comprises the following components in parts by weight: Polypropylene 15.0-25.0 parts, EPDM rubber 20.0-30.0 parts, SEBS 10.0-15.0 parts, plasticizer oil 30.0-40.0 parts, calcium powder A 10.0-15.0 parts, crosslinking agent A 0.2-0.5 parts, accelerator 0.2-0.4 parts, functional additives 4.0-7.0 parts and masterbatch 1.0-1.2 parts; The component B comprises the following components in parts by weight: POE 50.0-60.0 parts, TPO 40.0-50.0 parts, calcium powder B 10.0-15.0 parts, crosslinking agent B 0.2-0.5 parts, and POE-g-MAH 2.0-3.0 parts.

2. The medium transport layer soft material for plastic reinforced composite pipe according to claim 1, characterized in that: The polypropylene is selected from Shanghai Petrochemical M250E polypropylene PP; The ethylene content of the EPDM rubber is 60-65%, the ENB content is 4.0-5.0%, and the Mooney viscosity ML 1+4 (125° C.) of the EPDM rubber is 60-65; The SEBS is SEBS 7551U.

3. The medium transport layer soft material for plastic reinforced composite pipe according to claim 1, characterized in that: The plasticizing oil is light-colored paraffin oil with a viscosity of 72 mPa·s (40°C), a flash point of 266, and a specific gravity of 0.867; The calcium powder A and calcium powder B are both made of light calcium carbonate with a mesh size of 400 to 800. The crosslinking agent A and the crosslinking agent B are both selected from the bifunctional peroxide 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.

4. The medium transport layer soft material for plastic reinforced composite pipe according to claim 1, characterized in that: The accelerator is HVA-2; The functional additive is selected from one or more of antioxidant 1010, antioxidant 168, and antioxidant MIANOX300; The masterbatch is Plasblak LL2590.

5. The medium transport layer soft material for plastic reinforced composite pipe according to claim 1, characterized in that: The POE selected is POE Exxon 6102; The TPO is TPO Basel Q300F; The MAH grafting rate of the POE-g-MAH is 1.0-1.3%, and the melt index (190°C / 2.16kg) is 0.6-2.0g / 10min.

6. The medium transport layer soft material for plastic reinforced composite pipe according to claim 1, characterized in that: The weight ratio of component A to component B is 10:(2-4).

7. A method for preparing a medium transport layer soft material for a plastic reinforced composite pipe according to any one of claims 1 to 6, characterized in that: The method comprises the following steps:

1. Preparation of component A: S1. First, EPDM rubber, plasticizer oil and calcium powder A are mixed evenly to form a mixed material A for standby use; S2, polypropylene, SEBS, functional additives, and masterbatch are mixed evenly to form a mixed material B for standby use; S3, mixing the crosslinking agent A and the accelerator evenly to form a mixed material C for standby use; S4, feeding the above-mentioned mixed material A, mixed material B and mixed material C into a twin-screw extruder in sequence, and performing extrusion granulation to obtain component A; Among them, the co-rotating twin-screw extrusion temperature is set as follows: zone 1 temperature 145 ~ 210 ° C, zone 2 temperature 145 ~ 210 ° C, zone 3 temperature 145 ~ 210 ° C, zone 4 temperature 145 ~ 210 ° C, zone 5 temperature 145 ~ 210 ° C, zone 6 temperature 145 ~ 210 ° C, zone 7 temperature 145 ~ 210 ° C, zone 8 temperature 145 ~ 210 ° C, zone 9 temperature 145 ~ 210 ° C, die head 145 ~ 210 ° C; 2. Preparation of component B: S1. Evenly mix POE, TPO and calcium powder B to form a mixed material D for standby use; S2, mix the crosslinking agent B and POE-g-MAH evenly to form a mixed material E for standby use; S3, feeding the above-mentioned mixed material D and mixed material E into a twin-screw extruder in sequence, and performing extrusion granulation to obtain component B; Among them, the co-rotating twin-screw extrusion temperature is set as follows: zone 1 temperature 145 ~ 210 ° C, zone 2 temperature 145 ~ 210 ° C, zone 3 temperature 145 ~ 210 ° C, zone 4 temperature 145 ~ 210 ° C, zone 5 temperature 145 ~ 210 ° C, zone 6 temperature 145 ~ 210 ° C, zone 7 temperature 145 ~ 210 ° C, zone 8 temperature 145 ~ 210 ° C, zone 9 temperature 145 ~ 210 ° C, die head 145 ~ 210 ° C; 3. Preparation of soft material for medium transport layer: Component A and component B are mixed in proportion and added into an extruder for melt extrusion to obtain a medium transport layer soft material.

8. A use of a medium transport layer soft material for a plastic reinforced composite pipe, characterized in that: The medium transport layer soft material according to any one of claims 1 to 6 is used to prepare a plastic-reinforced composite pipe together with a hard rib material; The plastic-reinforced composite pipe comprises: a pipe body (1) and ribs (2) wound around the pipe body (1); The material of the tube body (1) is a medium transport layer soft material, and the material of the ribs (2) is a hard rib material.

9. The use of a medium transport layer soft material for a plastic reinforced composite pipe according to claim 8, characterized in that: The production method of the plastic reinforced composite pipe is as follows: (1) co-extruding the medium transport layer soft material and the hard rib material through an extruder to obtain a molten winding strip; (2) The extruded winding strips are overlapped and wound by a spiral winding unit, cooled and shaped to obtain a plastic-reinforced composite pipe.

10. The use of a medium transport layer soft material for a plastic reinforced composite pipe according to claim 8, characterized in that: The weight ratio of the soft material of the medium transport layer to the hard rib material is 10:(3-5).

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