Composite PE / PVC-O water supply pipe

Abstract

The invention discloses a composite PE / PVC-O water supply pipe, and belongs to the technical field of pipeline preparation. The water supply pipe comprises an inner layer and an outer layer, wherein the inner layer comprises PVC-O; the outer layer is arranged on the outer side of the inner layer and comprises PE; and the bonding layer is arranged between the inner layer and the outer layer and is used for bonding the outer layer to the outer side of the inner layer. The pipe comprises the inner layer, the outer layer and the bonding layer used for bonding the inner layer and the outer layer, and the pipe has good bending strength, impact strength and other performance through direct cooperative use of the raw materials of all the layers. The used polyamide-amine dendrimer is of a dendritic structure and is firstly stirred and mixed with the calcium carbonate, so that the dendritic space structure can be filled with the calcium carbonate, and the compressive strength of the pipe is further improved; the treated sepiolite and boron nitride are subjected to ultrasonic treatment, and boron nitride can be loaded into pores of the sepiolite and reacts with hydroxyl of cross-linked polyacrylate, so that the performance of the pipe is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline preparation, and in particular relates to a composite PE / PVC-O water supply pipe. Background Art

[0002] PE (polyethylene) material has the characteristics of corrosion resistance and non-toxicity, and is now widely used in the field of water supply pipe manufacturing, and is used for water supply in industries such as industry, agriculture, and municipal administration. However, during use, it was found that PE pipes have limited impact resistance and are easily damaged when subjected to high pressure, affecting normal use.

[0003] Chinese patent document CN107573568A discloses a PE water supply pipe, including a PE pipe body, wherein the PE pipe body is prepared from the following raw materials in parts by weight: 95-105 parts of high-density polyethylene, 1-2 parts of PVC resin, 1-2 parts of silane coupling agent, 1-2 parts of light calcium carbonate and 2-5 parts of stabilizer, wherein the linear average particle size of the light calcium carbonate is 0.02-1 μm, the sedimentation volume of the light calcium carbonate is 4.5-5.5 ml / g, and the specific surface area of ​​the light calcium carbonate is 4-4.5 m 2 / g. The PE water supply pipe of the present invention has the advantages of good rigidity and excellent stability.

[0004] In the above patented technical solution, PVC is added to the raw materials to improve the performance of the PE water pipe, but the amount of raw materials used is limited and the overall performance improvement is limited. Summary of the invention

[0005] The present invention provides a composite PE / PVC-O water supply pipe to solve the above technical problems.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A composite PE / PVC-O water supply pipe, comprising:

[0008] Inner layer 1, including PVC-O;

[0009] The outer layer 2 is arranged on the outer side of the inner layer 1 and comprises PE;

[0010] The adhesive layer 3 is disposed between the inner layer 1 and the outer layer 2 to bond the outer layer 2 to the outer side of the inner layer 1 .

[0011] Furthermore, the inner layer 1 also includes the following raw materials: acrylate, aluminate coupling agent, calcium carbonate, polyamide-amine type dendrimer; the weight proportions of each raw material are: 35-70 parts of PVC-O, 8-18 parts of acrylate, 2-6 parts of aluminate coupling agent, 2-5 parts of calcium carbonate, and 1-3 parts of polyamide-amine type dendrimer.

[0012] Furthermore, the outer layer 2 also includes the following raw materials: silane crosslinking agent, calcium carbonate, sepiolite, boron nitride, crosslinked polyacrylate, polyamide-amine dendrimer, calcium stearate, and hydrotalcite; the weight proportions of each raw material are: 60-95 parts of PE, 3-10 parts of silane crosslinking agent, 4-10 parts of calcium carbonate, 1-4 parts of sepiolite, 2-9 parts of boron nitride, 1-4 parts of crosslinked polyacrylate, 2-5 parts of polyamide-amine dendrimer, 1-3 parts of calcium stearate, and 2-5 parts of hydrotalcite.

[0013] Furthermore, the adhesive layer 3 comprises the following raw materials in parts by weight: 1-4 parts of butyl acetate, 3-9 parts of diethylene glycol butyl ether acetate, and 4-16 parts of oxidized polyethylene wax.

[0014] The present invention also provides a method for preparing a composite PE / PVC-O water supply pipe, comprising:

[0015] S1. Weigh the raw materials used for the inner layer 1, the outer layer 2, and the adhesive layer 3;

[0016] S2, the preparation of the inner layer 1 is as follows: calcium carbonate is added to the polyamide-amine type dendrimer, and stirred evenly to obtain a mixture A; PVC-O is heated, and then acrylate and aluminate coupling agents are added and stirred evenly, and then the mixture A is added and stirred evenly; finally, screw extrusion is performed to obtain;

[0017] S3, the outer layer 2 is prepared as follows: sepiolite is first treated with acid, rinsed and dried, added to water and stirred evenly, then boron nitride is added, ultrasonically treated, filtered, precipitated and dried, crushed, and then added to cross-linked polyacrylate and stirred evenly to obtain mixture B; calcium carbonate is added to polyamide-amine dendrimer and stirred evenly to obtain mixture C; PE is heated, silane crosslinking agent, calcium stearate and hydrotalcite are added, stirred, and then mixture B and mixture C are added and stirred evenly; finally, screw extrusion is performed to obtain;

[0018] S4, mixing and heating the raw materials used for the bonding layer 3, and then spraying them on the outer surface of the inner layer prepared in step S2;

[0019] S5. The inner layer obtained in step S4 is bonded to the outer layer obtained in step S3 through a screw extruder, and then cooled and formed.

[0020] Furthermore, the screw extrusion temperature in step S2 is: 155-170°C in the feeding section, 173-178°C in the compression section, 170-175°C in the metering section, 170-175°C in the diverter, and 180-195°C in the die section.

[0021] Furthermore, the ultrasonic treatment in step S3 is: power 300-500W, frequency 10-16kHz, time 1-5min.

[0022] Furthermore, the screw extrusion temperatures in step S3 are: 95-120°C in the feeding section, 135-155°C in the compression section, 130-150°C in the metering section, 135-150°C in the diverter, and 150-170°C in the die.

[0023] Furthermore, before spraying in step S4, the outer surface of the inner layer prepared in step S2 is subjected to plasma treatment with a power of 50-80 W and a gas flow rate of 1.5-3 Lmin.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The pipe material of the present invention comprises an inner layer, an outer layer and an adhesive layer for bonding the inner layer and the outer layer. The raw materials of each layer are directly used in combination, so that the pipe material has good bending strength, impact resistance and other properties.

[0026] The butyl acetate, diethylene glycol butyl acetate, and oxidized polyethylene wax raw materials used in the bonding layer can cooperate with each other to better bond the inner and outer layers; plasma treatment of the outer surface of the inner layer can increase the contact area of ​​the bonding material sprayed on the outer surface of the inner layer, thereby improving the bonding strength between the layers and avoiding quality problems such as separation between the layers.

[0027] The polyamide-amine dendrimer used has a tree-like structure. It is first stirred and mixed with calcium carbonate, which allows the calcium carbonate to fill the tree-like spatial structure, thereby improving the compressive strength of the pipe; the treated sepiolite and boron nitride are treated under ultrasound, which can load the boron nitride into the pores of the sepiolite and react with the hydroxyl groups of the cross-linked polyacrylate to improve the performance of the pipe.

[0028] The invention makes the prepared water supply pipe have better performance through reasonable matching of raw materials and reasonable setting of preparation parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the water supply pipe structure of the present invention.

[0030] Reference numerals: 1 - inner layer, 2 - outer layer, 3 - adhesive layer. DETAILED DESCRIPTION

[0031] To facilitate a better understanding of the present invention, the following examples are provided to illustrate the present invention in conjunction with the accompanying drawings. These examples belong to the protection scope of the present invention, but do not limit the protection scope of the present invention.

[0032] Example 1

[0033] A composite PE / PVC-O water supply pipe, such as Figure 1 As shown, including:

[0034] Inner layer 1, including PVC-O;

[0035] The outer layer 2 is arranged outside the inner layer 1 and includes PE;

[0036] The adhesive layer 3 is disposed between the inner layer 1 and the outer layer 2 to bond the outer layer 2 to the outer side of the inner layer 1 .

[0037] The inner layer 1 also includes the following raw materials: acrylate, aluminate coupling agent, calcium carbonate, polyamide-amine type dendrimer; the weight proportions of the raw materials are: 35 parts of PVC-O, 8 parts of acrylate, 2 parts of aluminate coupling agent, 2 parts of calcium carbonate, and 1 part of polyamide-amine type dendrimer.

[0038] The outer layer 2 also includes the following raw materials: silane crosslinking agent, calcium carbonate, sepiolite, boron nitride, crosslinked polyacrylate, polyamide-amine dendrimer, calcium stearate, and hydrotalcite; the weight proportions of each raw material are: 60-95 parts of PE, 3 parts of silane crosslinking agent, 4 parts of calcium carbonate, 1 part of sepiolite, 2 parts of boron nitride, 1 part of crosslinked polyacrylate, 2 parts of polyamide-amine dendrimer, 1 part of calcium stearate, and 2 parts of hydrotalcite.

[0039] The adhesive layer 3 comprises the following raw materials in parts by weight: 1 part of butyl acetate, 3 parts of diethylene glycol butyl ether acetate, and 4 parts of oxidized polyethylene wax.

[0040] The present invention also provides a method for preparing a composite PE / PVC-O water supply pipe, comprising:

[0041] S1. Weigh the raw materials used for the inner layer 1, the outer layer 2, and the adhesive layer 3;

[0042] S2, the preparation of the inner layer 1 is as follows: calcium carbonate is added to the polyamide-amine type dendrimer, and stirred evenly to obtain a mixture A; PVC-O is heated, and then acrylate and aluminate coupling agents are added and stirred evenly, and then the mixture A is added and stirred evenly; finally, screw extrusion is performed to obtain;

[0043] S3, the preparation of outer layer 2 is as follows: sepiolite is first treated with acid, rinsed and dried, added to water and stirred evenly, then boron nitride is added, ultrasonically treated, filtered, precipitated and dried, crushed, and then added to cross-linked polyacrylate and stirred evenly to obtain mixture B; calcium carbonate is added to polyamide-amine dendrimer and stirred evenly to obtain mixture C; PE is heated, silane crosslinking agent, calcium stearate and hydrotalcite are added, stirred, and then mixture B and mixture C are added and stirred evenly; finally, screw extrusion is performed to obtain;

[0044] S4, the raw materials used for the adhesive layer 3 are mixed and heated, and then sprayed on the outer surface of the inner layer prepared in step S2;

[0045] S5. The inner layer obtained in step S4 is bonded to the outer layer obtained in step S3 through a screw extruder, and then cooled and formed.

[0046] The screw extrusion temperatures in step S2 are: 155°C in the feeding section, 173°C in the compression section, 170°C in the metering section, 170°C in the diverter section, and 180°C in the die section.

[0047] The ultrasonic treatment in step S3 is as follows: power 500 W, frequency 16 kHz, time 1 min.

[0048] The screw extrusion temperatures in step S3 are: 95°C in the feeding section, 135°C in the compression section, 130°C in the metering section, 135°C in the diverter, and 150°C in the die.

[0049] Before spraying in step S4, the outer surface of the inner layer prepared in step S2 is plasma treated with a power of 50 W and a gas flow rate of 3 L min.

[0050] Example 2

[0051] A composite PE / PVC-O water supply pipe, such as Figure 1 As shown, including:

[0052] Inner layer 1, including PVC-O;

[0053] The outer layer 2 is arranged outside the inner layer 1 and includes PE;

[0054] The adhesive layer 3 is disposed between the inner layer 1 and the outer layer 2 to bond the outer layer 2 to the outer side of the inner layer 1 .

[0055] The inner layer 1 also includes the following raw materials: acrylate, aluminate coupling agent, calcium carbonate, polyamide-amine type dendrimer; the weight parts of each raw material are: 42 parts of PVC-O, 10 parts of acrylate, 3 parts of aluminate coupling agent, 3 parts of calcium carbonate, and 2 parts of polyamide-amine type dendrimer.

[0056] The outer layer 2 also includes the following raw materials: silane crosslinking agent, calcium carbonate, sepiolite, boron nitride, crosslinked polyacrylate, polyamide-amine dendrimer, calcium stearate, and hydrotalcite; the weight proportions of each raw material are: 65 parts of PE, 5 parts of silane crosslinking agent, 5 parts of calcium carbonate, 2 parts of sepiolite, 3 parts of boron nitride, 2 parts of crosslinked polyacrylate, 3 parts of polyamide-amine dendrimer, 2 parts of calcium stearate, and 3 parts of hydrotalcite.

[0057] The adhesive layer 3 comprises the following raw materials in parts by weight: 2 parts of butyl acetate, 4 parts of diethylene glycol butyl ether acetate, and 6 parts of oxidized polyethylene wax.

[0058] The present invention also provides a method for preparing a composite PE / PVC-O water supply pipe, comprising:

[0059] S1. Weigh the raw materials used for the inner layer 1, the outer layer 2, and the adhesive layer 3;

[0060] S2, the preparation of the inner layer 1 is as follows: calcium carbonate is added to the polyamide-amine type dendrimer, and stirred evenly to obtain a mixture A; PVC-O is heated, and then acrylate and aluminate coupling agents are added and stirred evenly, and then the mixture A is added and stirred evenly; finally, screw extrusion is performed to obtain;

[0061] S3, the preparation of outer layer 2 is as follows: sepiolite is first treated with acid, rinsed and dried, added to water and stirred evenly, then boron nitride is added, ultrasonically treated, filtered, precipitated and dried, crushed, and then added to cross-linked polyacrylate and stirred evenly to obtain mixture B; calcium carbonate is added to polyamide-amine dendrimer and stirred evenly to obtain mixture C; PE is heated, silane crosslinking agent, calcium stearate and hydrotalcite are added, stirred, and then mixture B and mixture C are added and stirred evenly; finally, screw extrusion is performed to obtain;

[0062] S4, the raw materials used for the adhesive layer 3 are mixed and heated, and then sprayed on the outer surface of the inner layer prepared in step S2;

[0063] S5. The inner layer obtained in step S4 is bonded to the outer layer obtained in step S3 through a screw extruder, and then cooled and formed.

[0064] The screw extrusion temperatures in step S2 are: 160°C in the feeding section, 175°C in the compression section, 170°C in the metering section, 172°C in the diverter, and 185°C in the die section.

[0065] The ultrasonic treatment in step S3 is as follows: power 400 W, frequency 2 kHz, time 2 min.

[0066] The screw extrusion temperatures in step S3 are: 105°C in the feeding section, 140°C in the compression section, 135°C in the metering section, 137°C in the diverter, and 155°C in the die.

[0067] Before spraying in step S4, the outer surface of the inner layer prepared in step S2 is subjected to plasma treatment with a power of 60 W and a gas flow rate of 2 L min.

[0068] Example 3

[0069] A composite PE / PVC-O water supply pipe, such as Figure 1 As shown, including:

[0070] Inner layer 1, including PVC-O;

[0071] The outer layer 2 is arranged outside the inner layer 1 and includes PE;

[0072] The adhesive layer 3 is disposed between the inner layer 1 and the outer layer 2 to bond the outer layer 2 to the outer side of the inner layer 1 .

[0073] The inner layer 1 also includes the following raw materials: acrylate, aluminate coupling agent, calcium carbonate, polyamide-amine type dendrimer; the weight parts of each raw material are: 55 parts of PVC-O, 12 parts of acrylate, 4 parts of aluminate coupling agent, 4.5 parts of calcium carbonate, and 2.5 parts of polyamide-amine type dendrimer.

[0074] The outer layer 2 also includes the following raw materials: silane crosslinking agent, calcium carbonate, sepiolite, boron nitride, crosslinked polyacrylate, polyamide-amine dendrimer, calcium stearate, and hydrotalcite; the weight proportions of each raw material are: 85 parts of PE, 6 parts of silane crosslinking agent, 7 parts of calcium carbonate, 3 parts of sepiolite, 6 parts of boron nitride, 3 parts of crosslinked polyacrylate, 4 parts of polyamide-amine dendrimer, 2 parts of calcium stearate, and 4 parts of hydrotalcite.

[0075] The adhesive layer 3 comprises the following raw materials in parts by weight: 3 parts of butyl acetate, 7 parts of diethylene glycol butyl ether acetate, and 12 parts of oxidized polyethylene wax.

[0076] The present invention also provides a method for preparing a composite PE / PVC-O water supply pipe, comprising:

[0077] S1. Weigh the raw materials used for the inner layer 1, the outer layer 2, and the adhesive layer 3;

[0078] S2, the preparation of the inner layer 1 is as follows: calcium carbonate is added to the polyamide-amine type dendrimer, and stirred evenly to obtain a mixture A; PVC-O is heated, and then acrylate and aluminate coupling agents are added and stirred evenly, and then the mixture A is added and stirred evenly; finally, screw extrusion is performed to obtain;

[0079] S3, the preparation of outer layer 2 is as follows: sepiolite is first treated with acid, rinsed and dried, added to water and stirred evenly, then boron nitride is added, ultrasonically treated, filtered, precipitated and dried, crushed, and then added to cross-linked polyacrylate and stirred evenly to obtain mixture B; calcium carbonate is added to polyamide-amine dendrimer and stirred evenly to obtain mixture C; PE is heated, silane crosslinking agent, calcium stearate and hydrotalcite are added, stirred, and then mixture B and mixture C are added and stirred evenly; finally, screw extrusion is performed to obtain;

[0080] S4, the raw materials used for the adhesive layer 3 are mixed and heated, and then sprayed on the outer surface of the inner layer prepared in step S2;

[0081] S5. The inner layer obtained in step S4 is bonded to the outer layer obtained in step S3 through a screw extruder, and then cooled and formed.

[0082] The screw extrusion temperatures in step S2 are: 160°C in the feeding section, 175°C in the compression section, 172°C in the metering section, 173°C in the diverter section, and 190°C in the die section.

[0083] The ultrasonic treatment in step S3 is as follows: power 400 W, frequency 13 kHz, time 2 min.

[0084] The screw extrusion temperatures in step S3 are: 110° C. in the feeding section, 150° C. in the compression section, 145° C. in the metering section, 143° C. in the diverter, and 160° C. in the die.

[0085] Before spraying in step S4, the outer surface of the inner layer prepared in step S2 is subjected to plasma treatment with a power of 70 W and a gas flow rate of 2.5 L min.

[0086] Example 4

[0087] A composite PE / PVC-O water supply pipe, such as Figure 1 As shown, including:

[0088] Inner layer 1, including PVC-O;

[0089] The outer layer 2 is arranged outside the inner layer 1 and includes PE;

[0090] The adhesive layer 3 is disposed between the inner layer 1 and the outer layer 2 to bond the outer layer 2 to the outer side of the inner layer 1 .

[0091] The inner layer 1 also includes the following raw materials: acrylate, aluminate coupling agent, calcium carbonate, polyamide-amine type dendrimer; the weight parts of each raw material are: 60 parts of PVC-O, 15 parts of acrylate, 5 parts of aluminate coupling agent, 4 parts of calcium carbonate, and 2 parts of polyamide-amine type dendrimer.

[0092] The outer layer 2 also includes the following raw materials: silane crosslinking agent, calcium carbonate, sepiolite, boron nitride, crosslinked polyacrylate, polyamide-amine dendrimer, calcium stearate, and hydrotalcite; the weight proportions of each raw material are: 85 parts of PE, 8 parts of silane crosslinking agent, 6 parts of calcium carbonate, 3 parts of sepiolite, 7 parts of boron nitride, 4 parts of crosslinked polyacrylate, 4 parts of polyamide-amine dendrimer, 2 parts of calcium stearate, and 4 parts of hydrotalcite.

[0093] The adhesive layer 3 comprises the following raw materials in parts by weight: 3 parts of butyl acetate, 6 parts of diethylene glycol butyl ether acetate, and 15 parts of oxidized polyethylene wax.

[0094] The present invention also provides a method for preparing a composite PE / PVC-O water supply pipe, comprising:

[0095] S1. Weigh the raw materials used for the inner layer 1, the outer layer 2, and the adhesive layer 3;

[0096] S2, the preparation of the inner layer 1 is as follows: calcium carbonate is added to the polyamide-amine type dendrimer, and stirred evenly to obtain a mixture A; PVC-O is heated, and then acrylate and aluminate coupling agents are added and stirred evenly, and then the mixture A is added and stirred evenly; finally, screw extrusion is performed to obtain;

[0097] S3, the preparation of outer layer 2 is as follows: sepiolite is first treated with acid, rinsed and dried, added to water and stirred evenly, then boron nitride is added, ultrasonically treated, filtered, precipitated and dried, crushed, and then added to cross-linked polyacrylate and stirred evenly to obtain mixture B; calcium carbonate is added to polyamide-amine dendrimer and stirred evenly to obtain mixture C; PE is heated, silane crosslinking agent, calcium stearate and hydrotalcite are added, stirred, and then mixture B and mixture C are added and stirred evenly; finally, screw extrusion is performed to obtain;

[0098] S4, the raw materials used for the adhesive layer 3 are mixed and heated, and then sprayed on the outer surface of the inner layer prepared in step S2;

[0099] S5. The inner layer obtained in step S4 is bonded to the outer layer obtained in step S3 through a screw extruder, and then cooled and formed.

[0100] The screw extrusion temperatures in step S2 are: 165°C in the feeding section, 177°C in the compression section, 173°C in the metering section, 174°C in the diverter section, and 190°C in the die section.

[0101] The ultrasonic treatment in step S3 is as follows: power 400 W, frequency 15 kHz, time 3 min.

[0102] The screw extrusion temperatures in step S3 are: 115°C in the feeding section, 150°C in the compression section, 145°C in the metering section, 143°C in the diverter, and 165°C in the die.

[0103] Before spraying in step S4, the outer surface of the inner layer prepared in step S2 is subjected to plasma treatment with a power of 60 W and a gas flow rate of 2 L min.

[0104] Example 5

[0105] A composite PE / PVC-O water supply pipe, such as Figure 1 As shown, including:

[0106] Inner layer 1, including PVC-O;

[0107] The outer layer 2 is arranged outside the inner layer 1 and includes PE;

[0108] The adhesive layer 3 is disposed between the inner layer 1 and the outer layer 2 to bond the outer layer 2 to the outer side of the inner layer 1 .

[0109] The inner layer 1 also includes the following raw materials: acrylate, aluminate coupling agent, calcium carbonate, polyamide-amine type dendrimer; the weight parts of each raw material are: 70 parts of PVC-O, 18 parts of acrylate, 6 parts of aluminate coupling agent, 5 parts of calcium carbonate, and 3 parts of polyamide-amine type dendrimer.

[0110] The outer layer 2 also includes the following raw materials: silane crosslinking agent, calcium carbonate, sepiolite, boron nitride, crosslinked polyacrylate, polyamide-amine dendrimer, calcium stearate, and hydrotalcite; the weight proportions of the raw materials are: 95 parts of PE, 10 parts of silane crosslinking agent, 10 parts of calcium carbonate, 4 parts of sepiolite, 9 parts of boron nitride, 4 parts of crosslinked polyacrylate, 5 parts of polyamide-amine dendrimer, 3 parts of calcium stearate, and 5 parts of hydrotalcite.

[0111] The adhesive layer 3 comprises the following raw materials in parts by weight: 4 parts of butyl acetate, 9 parts of diethylene glycol butyl ether acetate, and 16 parts of oxidized polyethylene wax.

[0112] The present invention also provides a method for preparing a composite PE / PVC-O water supply pipe, comprising:

[0113] S1. Weigh the raw materials used for the inner layer 1, the outer layer 2, and the adhesive layer 3;

[0114] S2, the preparation of the inner layer 1 is as follows: calcium carbonate is added to the polyamide-amine type dendrimer, and stirred evenly to obtain a mixture A; PVC-O is heated, and then acrylate and aluminate coupling agents are added and stirred evenly, and then the mixture A is added and stirred evenly; finally, screw extrusion is performed to obtain;

[0115] S3, the preparation of outer layer 2 is as follows: sepiolite is first treated with acid, rinsed and dried, added to water and stirred evenly, then boron nitride is added, ultrasonically treated, filtered, precipitated and dried, crushed, and then added to cross-linked polyacrylate and stirred evenly to obtain mixture B; calcium carbonate is added to polyamide-amine dendrimer and stirred evenly to obtain mixture C; PE is heated, silane crosslinking agent, calcium stearate and hydrotalcite are added, stirred, and then mixture B and mixture C are added and stirred evenly; finally, screw extrusion is performed to obtain;

[0116] S4, the raw materials used for the adhesive layer 3 are mixed and heated, and then sprayed on the outer surface of the inner layer prepared in step S2;

[0117] S5. The inner layer obtained in step S4 is bonded to the outer layer obtained in step S3 through a screw extruder, and then cooled and formed.

[0118] The screw extrusion temperatures in step S2 are: 170°C in the feeding section, 178°C in the compression section, 175°C in the metering section, 175°C in the diverter section, and 195°C in the die section.

[0119] The ultrasonic treatment in step S3 is as follows: power 300 W, frequency 13 kHz, time 5 min.

[0120] The screw extrusion temperatures in step S3 are: 120°C in the feeding section, 155°C in the compression section, 150°C in the metering section, 150°C in the diverter, and 170°C in the die.

[0121] Before spraying in step S4, the outer surface of the inner layer prepared in step S2 is subjected to plasma treatment with a power of 80 W and a gas flow rate of 1.5 L min.

[0122] Comparative Example 1

[0123] The same as Example 4, but the inner layer raw material lacks calcium carbonate and polyamide-amine dendrimer, and step S2 of the preparation method lacks the parts of "adding calcium carbonate to polyamide-amine dendrimer and stirring evenly to obtain mixture A" and "adding mixture A again".

[0124] Comparative Example 2

[0125] The same as Example 4, but the outer layer raw materials lack sepiolite, boron nitride, and cross-linked polyacrylate; and step S3 of the preparation method lacks the parts of "first treating the sepiolite with acid, rinsing and then drying, adding it into water and stirring evenly, then adding boron nitride, ultrasonically treating it, filtering it, precipitating it and drying it, crushing it, and then adding it into the cross-linked polyacrylate and stirring evenly to obtain mixture B" and "then adding mixture B".

[0126] Comparative Example 3

[0127] The same as Example 4, but the outer layer raw material lacks calcium carbonate and polyamide-amine dendrimer, and step S2 of the preparation method lacks the parts of "adding calcium carbonate to polyamide-amine dendrimer, stirring evenly to obtain mixture C" and "adding mixture C again".

[0128] Comparative Example 4

[0129] The same as Example 4, but the outer layer raw materials lack sepiolite, boron nitride, cross-linked polyacrylate, calcium carbonate and polyamide-amine dendrimer; and step S3 of the preparation method lacks the parts of "first acid-treating the sepiolite, rinsing and then drying, adding it to water and stirring evenly, then adding boron nitride, ultrasonically treating it, filtering, precipitating and drying, crushing it, and then adding it to the cross-linked polyacrylate and stirring evenly to obtain a mixture B" and "then adding the mixture B", "adding calcium carbonate to the polyamide-amine dendrimer and stirring evenly to obtain a mixture C" and "then adding the mixture C".

[0130] Comparative Example 5

[0131] The same as Example 4, but the inner layer raw materials lack calcium carbonate and polyamide-amine dendrimer, and the outer layer raw materials lack sepiolite, boron nitride, cross-linked polyacrylate, calcium carbonate and polyamide-amine dendrimer; and step S2 of the preparation method lacks "adding calcium carbonate to the polyamide-amine dendrimer and stirring evenly to obtain mixture A" and "adding mixture A again", and step S3 lacks "first acid-treating the sepiolite, rinsing and then drying, adding it to water and stirring evenly, then adding boron nitride, ultrasonically treating, filtering, precipitating, drying and crushing to obtain mixture B", "adding mixture B again", "adding calcium carbonate to the polyamide-amine dendrimer and stirring evenly to obtain mixture C", and "adding mixture C again".

[0132] Water pipe testing

[0133] The water supply pipe samples were prepared by the methods of the above Examples 1-5 and Comparative Examples 1-4. The raw material PE used in each group was PE100. The particle size of calcium carbonate and hydrotalcite used was 2 μm. The sepiolite and boron nitride were processed to obtain precipitates. After drying, the crushed particle size was 1.5 μm.

[0134] Test the following indicators:

[0135] Bending strength, according to the standard "Determination of flexural properties of plastics" (GB / T 9341-2008);

[0136] Impact strength, according to the standard "Determination of impact properties of simply supported beams of plastics Part 1: Non-instrumented impact test" (GB / T 1043.1-2008);

[0137] The hydrostatic strength test is based on the standard "Internal Pressure Test Method for Thermoplastic Pipes for Fluid Transportation" (GB / T6111-2018).

[0138] The test results are shown in Table 1.

[0139] Table 1 Test results of each group of water supply pipes

[0140]

[0141]

[0142] It can be seen from the data in Table 1 that the hydrostatic strength tests of each group meet the standard requirements. Under different temperature, ring stress and time tests, the pipes have no cracks and no leakage. The pipes prepared in Examples 1-5 of the present application have good bending strength and impact strength, among which Example 4 is the best example, indicating that the raw materials and preparation methods used have a positive effect on improving the bending strength, impact strength and other properties of the pipes.

[0143] Compared with Comparative Examples 1-5, Example 4 may have a synergistic effect among the raw materials used, calcium carbonate, polyamide-amine dendrimer, sepiolite, boron nitride, and cross-linked polyacrylate, so that the bending strength and impact strength of Example 4 are greatly improved relative to Comparative Examples 1-5.

[0144] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the statement "including an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0145] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A composite PE / PVC-O water supply pipe, characterized in that: include: An inner layer (1) comprising PVC-O; An outer layer (2), arranged on the outer side of the inner layer (1), comprising PE; The adhesive layer (3) is arranged between the inner layer (1) and the outer layer (2) and is used to bond the outer layer (2) to the outer side of the inner layer (1).

2. A composite PE / PVC-O water supply pipe according to claim 1, characterized in that: The inner layer (1) further comprises the following raw materials: Acrylate, aluminate coupling agent, calcium carbonate, polyamide-amine type dendrimer; the weight proportions of the raw materials are: 35-70 parts of PVC-O, 8-18 parts of acrylate, 2-6 parts of aluminate coupling agent, 2-5 parts of calcium carbonate, and 1-3 parts of polyamide-amine type dendrimer.

3. A composite PE / PVC-O water supply pipe according to claim 1, characterized in that: The outer layer (2) further comprises the following raw materials: Silane crosslinking agent, calcium carbonate, sepiolite, boron nitride, crosslinked polyacrylate, polyamide-amine dendrimer, calcium stearate, hydrotalcite; the weight proportions of the raw materials are: 60-95 parts of PE, 3-10 parts of silane crosslinking agent, 4-10 parts of calcium carbonate, 1-4 parts of sepiolite, 2-9 parts of boron nitride, 1-4 parts of crosslinked polyacrylate, 2-5 parts of polyamide-amine dendrimer, 1-3 parts of calcium stearate, and 2-5 parts of hydrotalcite.

4. A composite PE / PVC-O water supply pipe according to claim 2, characterized in that: The adhesive layer (3) comprises the following raw materials in parts by weight: 1-4 parts of butyl acetate, 3-9 parts of diethylene glycol butyl ether acetate, and 4-16 parts of oxidized polyethylene wax.

5. A composite PE / PVC-O water supply pipe according to any one of claims 1 to 4, characterized in that: The preparation method comprises: S1. Weigh the raw materials used for the inner layer (1), the outer layer (2), and the adhesive layer (3); S2, the inner layer (1) is prepared by: adding calcium carbonate to a polyamide-amine type dendrimer and stirring evenly to obtain a mixture A; heating PVC-O, then adding acrylate and aluminate coupling agent and stirring evenly, then adding the mixture A and stirring evenly; and finally screw extrusion molding to obtain; S3, the outer layer (2) is prepared as follows: sepiolite is first treated with acid, rinsed and dried, added to water and stirred evenly, then boron nitride is added, ultrasonically treated, filtered, precipitated and dried, crushed, and then added to cross-linked polyacrylate and stirred evenly to obtain mixture B; calcium carbonate is added to polyamide-amine dendrimer and stirred evenly to obtain mixture C; PE is heated, silane crosslinking agent, calcium stearate and hydrotalcite are added, stirred, and then mixture B and mixture C are added and stirred evenly; finally, screw extrusion is performed to obtain; S4, mixing and heating the raw materials used for the adhesive layer (3), and then spraying them on the outer surface of the inner layer prepared in step S2; S5. The inner layer obtained in step S4 is bonded to the outer layer obtained in step S3 through a screw extruder, and then cooled and formed.

6. A composite PE / PVC-O water supply pipe according to claim 5, characterized in that: The screw extrusion temperatures in step S2 are: 155-170°C in the feeding section, 173-178°C in the compression section, 170-175°C in the metering section, 170-175°C in the diverter, and 180-195°C in the die section.

7. A composite PE / PVC-O water supply pipe according to claim 6, characterized in that: The ultrasonic treatment in step S3 is as follows: power 300-500 W, frequency 10-16 kHz, time 1-5 min.

8. A composite PE / PVC-O water supply pipe according to claim 7, characterized in that: The screw extrusion temperatures in step S3 are: 95-120°C in the feeding section, 135-155°C in the compression section, 130-150°C in the metering section, 135-150°C in the splitter, and 150-170°C in the die.

9. A composite PE / PVC-O water supply pipe according to claim 8, characterized in that: Before spraying in step S4, the outer surface of the inner layer prepared in step S2 is subjected to plasma treatment with a power of 50-80 W and a gas flow rate of 1.5-3 Lmin.

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