A B-type carat tube with high ring stiffness and winding structure wall and its preparation method

Abstract

The invention discloses a B-type carat tube with a high ring stiffness wound structure wall and a preparation method thereof, belonging to the technical field of carat tubes. The carat tube comprises a base tube and a winding layer wound on the side wall of the base tube; the base tube comprises the following raw materials in parts by weight: 70-80 parts of modified polypropylene, 15-20 parts of glass fiber microbeads, 15-20 parts of ultrafine active talc powder, 15-20 parts of ultrafine active calcium carbonate, 2-3 parts of a compatibilizer, 2-3 parts of a toughening agent, and 0-10 parts of a masterbatch; the winding layer comprises the following raw materials in parts by weight: 50-60 parts of ultra-high molecular weight polyethylene, 20-30 parts of high-density polyethylene, 10-15 parts of glass fiber microbeads, 5-10 parts of ultrafine active talc powder, 0.5-0.8 parts of an antioxidant, 1-3 parts of a compatibilizer, 1-3 parts of an impact modifier, and 0-10 parts of a masterbatch; the carat tube prepared by the invention has higher ring stiffness, which can reach 40 kN / m 2 above.

Description

Technical Field

[0001] The invention belongs to the technical field of carat tubes, and particularly relates to a B-type carat tube with a high ring stiffness wound structural wall and a preparation method thereof. Background Art

[0002] Type B carat tubes are hot-wound high-density polyethylene (HDPE) spiral-wound structural pipes. They utilize non-toxic and harmless HDPE and polypropylene (PP) corrugated pipes as the skeleton, mixed with a specific proportion of masterbatch and other materials, and then scientifically and evenly proportioned to create a special structural pipe with high resistance to external pressure. Applications include: 1) sewage systems; 2) drainage systems; 3) storage tanks and containers; 4) pipeline renovation; and 5) special applications. Hot-wound spiral-wound pipes can also be used for specialized purposes such as ventilation and passageways.

[0003] Currently, the biggest problem with buried B-type carat pipes, especially large-diameter ones, is their low ring stiffness and poor resistance to external pressure. Excessive external pressure often causes the pipes to buckle and deform, limiting the application of plastic underground drainage pipes in many large and medium-sized cities. This significantly restricts their scope of application. How to effectively improve the pipe's ring stiffness while maintaining other performance characteristics within acceptable limits is an urgent issue that needs to be considered and resolved. Summary of the Invention

[0004] The object of the present invention is to provide a B-type carat tube with a wound structural wall having high ring stiffness and a preparation method thereof, so as to solve the problems in the background technology.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A B-type carat tube with a high ring stiffness wound structural wall, comprising a base tube and a winding layer wound around the side wall of the base tube;

[0007] The base tube comprises the following raw materials in parts by weight: 70-80 parts of modified polypropylene, 15-20 parts of glass fiber microbeads, 15-20 parts of ultrafine active talc powder, 15-20 parts of ultrafine active calcium carbonate, 2-3 parts of compatibilizer, 2-3 parts of toughening agent, and 0-10 parts of masterbatch;

[0008] The winding layer comprises the following raw materials in parts by weight: 50-60 parts of ultra-high molecular weight polyethylene, 20-30 parts of high-density polyethylene, 10-15 parts of glass fiber microbeads, 5-10 parts of ultra-fine active talc, 0.5-0.8 parts of antioxidant, 1-3 parts of compatibilizer, 1-3 parts of impact modifier, and 0-10 parts of masterbatch;

[0009] Furthermore, the glass fiber microbeads are prepared by the following steps:

[0010] Step 1: Acidify the hollow glass microspheres and glass fibers, mix them with a 95% by volume ethanol aqueous solution, add γ-aminopropyltriethoxysilane, heat to 50° C., stir and react for 24 hours, filter and dry to obtain an amino filler; the mass ratio of the hollow glass microspheres to the γ-aminopropyltriethoxysilane is 5:1;

[0011] Step 2: Diethylenetriamine and methanol were mixed, and methyl acrylate was added while stirring under nitrogen protection and ice-water bath conditions. The reaction was stirred for 6 hours. After the reaction was completed, the mixture was rotary evaporated at 60°C under vacuum conditions until the mass remained unchanged to obtain a branched intermediate product; the amount ratio of methyl acrylate, diethylenetriamine and methanol was 1 mol:1 mol:100 mL;

[0012] Step 3: Mix the amino filler and the branched intermediate product, set the temperature to 60°C and stir for 30 minutes, then heat it to 100°C and stir for 2 hours, then heat it to 130°C and stir for 2 hours. After stirring, filter, wash, and dry to obtain glass fiber microbeads. The mass ratio of the amino filler to the branched intermediate product is 1:5. When glass fiber is used as a reinforcing material for reinforced plastics, its biggest feature is its high tensile strength and good heat resistance, but its disadvantage is its very high brittleness. Glass microbeads are a hollow, closed, spherical, powdered, lightweight filling material. When combined with glass fiber, they improve product performance, improve the exposure of glass fiber, and improve flow properties. However, due to their large particle size and low interfacial bonding with the matrix, when subjected to external force, the glass microbeads fall off from the matrix before microcracks are formed at the stress concentration point. Especially when the dispersion is poor and the interfacial bonding is poor, it is more likely to cause a significant reduction in its impact strength.

[0013] Furthermore, the mass ratio of the hollow glass microspheres to the glass fibers is 8:5.

[0014] Furthermore, the acidification treatment comprises the following steps:

[0015] Add hollow glass microspheres and glass fibers to a 2 mol / L hydrochloric acid aqueous solution, set the temperature to 80°C, and stir for 8 hours. After stirring, add sodium hydroxide aqueous solution to adjust the pH value to about 8, centrifuge, and dry.

[0016] Furthermore, the modified polypropylene is prepared by the following steps:

[0017] Add block copolymer polypropylene particles, homopolymer polypropylene particles and EPDM rubber particles into a ball mill, and then use stainless steel grinding balls to ball mill for 3-5 hours to obtain modified polypropylene.

[0018] Furthermore, the mass ratio of block copolymer polypropylene particles, homopolymer polypropylene particles, and EPDM rubber particles is 10:3:1. Polypropylene has heat resistance and corrosion resistance, but poor impact resistance and toughness. Adding EPDM rubber improves the toughness and impact resistance of polypropylene.

[0019] Furthermore, the toughening agent is a CPE toughening agent; the compatibilizer is maleic anhydride grafted polypropylene; the masterbatch is one of a black masterbatch and a blue masterbatch; the impact modifier is acrylonitrile-butadiene-styrene copolymer, and the antioxidant is tris(2,4-di-tert-butylphenyl) phosphite.

[0020] Furthermore, the particle size of the ultrafine active talc powder is ≤6.5 μm, and the particle size of the ultrafine active calcium carbonate is ≤6.5 μm.

[0021] Furthermore, the molecular weight of ultra-high molecular weight polyethylene is 3 million and the density is 0.94 g / cm 3， Particle size 60 mesh; relative density of high-density polyethylene is 0.94-0.96g / cm 3 .

[0022] A method for preparing a B-type carat tube with a high ring stiffness wound structural wall comprises the following steps:

[0023] The first step is to weigh the raw materials for the base tube according to parts by weight, stir and heat the weighed raw materials, and then put them into a screw extruder. The surface temperature of the forming mold is heated to 110-130°C, and then the first mixture extruded from the screw extruder is wrapped around the surface of the forming mold and allowed to cool for 3-5 hours to form the base tube.

[0024] The second step is to weigh the raw materials for the winding layer according to weight, heat and mix the weighed raw materials, put them into the screw extruder after mixing, heat the molding die again to melt the surface of the base tube, and then wrap the second mixture extruded from the screw extruder around the surface of the base tube, and bond it to the outside of the base tube to form a coating layer. After cooling, a B-type carat tube with a high ring stiffness winding structure wall is obtained.

[0025] Furthermore, the temperature of heating and mixing in the first step is 200-220°C, and the extrusion temperature in the first step is 180-200°C; the temperature of heating and mixing in the second step is 210-230°C, and the extrusion temperature in the second step is 150-160°C.

[0026] Beneficial effects of the present invention:

[0027] The present invention prepares a B-type carat tube with a high ring stiffness wound structure wall, and improves product performance by adjusting the ingredients. Specifically, hollow glass microbeads and glass fibers are processed to improve their dispersibility in the polymer matrix and enhance interfacial effects. The glass fiber microbeads in the base tube can improve the mixing effect of the raw materials in the modified polypropylene. In addition, the branched structure on the surface of the glass fiber microbeads can increase the degree of cross-linking between the raw materials, further improving the mechanical properties; the branched structure of the glass fiber microbeads and the molecular chains of the macromolecular material are mutually entangled and reacted, which can enhance interfacial interactions; the glass fiber microbeads in the winding layer serve as reinforcing fillers to improve tensile strength and enhance the ring stiffness of the carat tube. The prepared carat tube has a higher ring stiffness, which can reach 40kN / m 2 above.

[0028] Glass fiber microbeads, ultrafine active talc powder and ultrafine active calcium carbonate can be used as fillers and can be evenly dispersed in the organic matrix to form stress concentration points, which can fully absorb impact force, so that the material will not suffer structural damage when subjected to external force, absorb impact deformation energy, and thus play a significant role in strengthening and increasing rigidity. DETAILED DESCRIPTION

[0029] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] A B-type carat tube with a high-ring-rigidity wound structural wall comprises a base tube and a winding layer wound around the side wall of the base tube.

[0031] Example 1

[0032] This embodiment provides a glass fiber microbead, which is prepared by the following steps:

[0033] Step 1: Add hollow glass microspheres and glass fibers to a 2 mol / L hydrochloric acid aqueous solution, set the temperature to 80°C, stir for 8 hours, add sodium hydroxide aqueous solution to adjust the pH value to about 8, centrifuge and dry; mix the acidified hollow glass microspheres and glass fibers with a 95% volume fraction ethanol aqueous solution, then add γ-aminopropyltriethoxysilane, heat to 50°C, stir and react for 24 hours, filter and dry to obtain an amino filler; the mass ratio of hollow glass microspheres to glass fibers is 8:5; the mass ratio of hollow glass microspheres to γ-aminopropyltriethoxysilane is 5:1

[0034] Step 2: Diethylenetriamine and methanol were mixed, and methyl acrylate was added while stirring under nitrogen protection and ice-water bath conditions. The reaction was stirred for 6 hours. After the reaction was completed, the mixture was rotary evaporated at 60°C under vacuum conditions until the mass remained unchanged to obtain a branched intermediate product; the amount ratio of methyl acrylate, diethylenetriamine and methanol was 1 mol:1 mol:100 mL;

[0035] Step 3: Mix the amino filler and the branched intermediate product, set the temperature to 60°C and stir for 30 minutes, then heat to 100°C and stir for 2 hours, then heat to 130°C and stir for 2 hours. After stirring, filter, wash, and dry to obtain glass fiber microbeads. The mass ratio of the amino filler to the branched intermediate product is 1:5.

[0036] Comparative Example 1

[0037] The hollow glass microspheres and glass fibers were added to a 2 mol / L hydrochloric acid aqueous solution, the temperature was set to 80°C, and the mixture was stirred for 8 hours. After the stirring was completed, a sodium hydroxide aqueous solution was added to adjust the pH value to about 8, and the mixture was centrifuged and dried. The acidified hollow glass microspheres and glass fibers were mixed with a 95% by volume ethanol aqueous solution, and then γ-aminopropyltriethoxysilane was added. The mixture was heated to 50°C and stirred for 24 hours. After the reaction was completed, the mixture was filtered and dried to obtain an amino filler. The mass ratio of the hollow glass microspheres to the glass fibers was 8:5.

[0038] Example 2

[0039] Preparation of modified polypropylene:

[0040] Block copolymer polypropylene particles, homopolymer polypropylene particles, and EPDM rubber particles were added to a ball mill and milled for 5 hours using stainless steel balls to obtain modified polypropylene. The mass ratio of block copolymer polypropylene particles, homopolymer polypropylene particles, and EPDM rubber particles was 10:3:1.

[0041] Example 3

[0042] A method for preparing a B-type carat tube with a high ring stiffness wound structural wall comprises the following steps:

[0043] The first step is to weigh the base tube raw materials according to weight: 70 parts of modified polypropylene prepared in Example 2, 15 parts of glass fiber microbeads prepared in Example 1, 15 parts of ultrafine active talc powder, 15 parts of ultrafine active calcium carbonate, 2 parts of maleic anhydride grafted polypropylene, and 2 parts of CPE toughening agent; the weighed raw materials are stirred and heated to mix, and after mixing, they are put into a screw extruder, and the surface temperature of the forming mold is heated to 110°C, and then the first mixture extruded from the screw extruder is wrapped around the surface of the forming mold and cooled for 3 hours to form a base tube; the heating and mixing temperature is 200°C; the extrusion temperature is 180°C;

[0044] The second step is to weigh the raw materials for the winding layer according to weight: 50 parts of ultra-high molecular weight polyethylene, 20 parts of high-density polyethylene, 10 parts of glass fiber microbeads, 5 parts of ultrafine activated talc, 0.5 parts of tris(2,4-di-tert-butylphenyl) phosphite, 1 part of maleic anhydride grafted polypropylene, and 1 part of acrylonitrile-butadiene-styrene copolymer; the weighed raw materials are heated and mixed, and after mixing, they are put into a screw extruder. The molding die is heated again to melt the surface of the base tube, and the second mixture extruded from the screw extruder is then wrapped around the surface of the base tube, and the outer surface of the base tube is bonded to form a coating layer. After cooling, a B-type carat tube with a high ring stiffness wound structure wall is obtained. The hot mixing temperature is 210°C and the extrusion temperature is 150°C.

[0045] Example 4

[0046] A method for preparing a B-type carat tube with a high ring stiffness wound structural wall comprises the following steps:

[0047] The first step is to weigh the base tube raw materials according to weight: 80 parts of modified polypropylene prepared in Example 2, 20 parts of glass fiber microbeads prepared in Example 1, 20 parts of ultrafine active talc powder, 20 parts of ultrafine active calcium carbonate, 3 parts of maleic anhydride grafted polypropylene, 3 parts of CPE toughening agent, and 10 parts of black masterbatch; the weighed raw materials are stirred and heated to mix, and after mixing, they are put into a screw extruder, and the surface temperature of the forming mold is heated to 130°C, and then the first mixture extruded from the screw extruder is wrapped around the surface of the forming mold and cooled for 5 hours to form a base tube; the heating and mixing temperature is 220°C; the extrusion temperature is 200°C;

[0048] The second step is to weigh the raw materials for the winding layer according to weight: 60 parts of ultra-high molecular weight polyethylene, 30 parts of high-density polyethylene, 15 parts of glass fiber microbeads, 10 parts of ultrafine activated talc, 0.8 parts of tris(2,4-di-tert-butylphenyl) phosphite, 3 parts of maleic anhydride grafted polypropylene, 3 parts of acrylonitrile-butadiene-styrene copolymer, and 10 parts of black masterbatch; the weighed raw materials are heated and mixed, and after mixing, they are put into a screw extruder. The molding die is heated again to melt the surface of the base tube, and the second mixture extruded from the screw extruder is then wrapped around the surface of the base tube, and the outer surface of the base tube is bonded to form a coating layer. After cooling, a B-type carat tube with a high ring stiffness winding structure wall is obtained. The hot mixing temperature is 230°C and the extrusion temperature is 160°C.

[0049] Example 5

[0050] A method for preparing a B-type carat tube with a high ring stiffness wound structural wall comprises the following steps:

[0051] The first step is to weigh the base tube raw materials according to weight: 80 parts of modified polypropylene prepared in Example 2, 20 parts of glass fiber microbeads prepared in Example 1, 20 parts of ultrafine active talc powder, 20 parts of ultrafine active calcium carbonate, 3 parts of maleic anhydride grafted polypropylene, and 3 parts of CPE toughening agent; the weighed raw materials are stirred and heated to mix, and after mixing, they are put into a screw extruder, and the surface temperature of the forming mold is heated to 130°C, and then the first mixture extruded from the screw extruder is wrapped around the surface of the forming mold and cooled for 5 hours to form a base tube; the heating and mixing temperature is 220°C; the extrusion temperature is 200°C;

[0052] The second step is to weigh the raw materials for the winding layer according to weight: 60 parts of ultra-high molecular weight polyethylene, 30 parts of high-density polyethylene, 15 parts of glass fiber microbeads, 10 parts of ultrafine activated talc, 0.8 parts of tris(2,4-di-tert-butylphenyl) phosphite, 3 parts of maleic anhydride grafted polypropylene, and 3 parts of acrylonitrile-butadiene-styrene copolymer; the weighed raw materials are heated and mixed, and then put into a screw extruder. The molding die is heated again to melt the surface of the base tube, and the second mixture extruded from the screw extruder is then wrapped around the surface of the base tube, and the outer surface of the base tube is bonded to form a coating layer. After cooling, a B-type carat tube with a high ring stiffness winding structure wall is obtained. The hot mixing temperature is 230°C and the extrusion temperature is 160°C.

[0053] Comparative Example 2

[0054] Compared with Example 5, this comparative example replaces the glass fiber microbeads with the sample prepared in Comparative Example 1, and the remaining raw materials and preparation process remain the same as those in Example 5.

[0055] Performance tests were performed on Examples 3 to 5 and Comparative Example 2, wherein the ring stiffness was tested according to the GB / T9647-2015 test method; the tensile strength was tested according to GB / T8804.2; the results are shown in Table 1:

[0056] Table 1

[0057] project Example 3 Example 4 Example 5 Comparative Example 2 <![CDATA[Ring stiffness / (kN / m 2 )]]> 40.3 40.4 40.6 38.4 Tensile strength / MPa 42.8 42.9 43.1 40.5

[0058] As can be seen from Table 1, the carat tube prepared by the present invention has a higher ring stiffness, which can reach 40kN / m 2 above.

[0059] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0060] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A B-type carat tube with a high ring stiffness wound structure wall, characterized in that: It includes a base pipe and a winding layer wound around the side wall of the base pipe; The base tube comprises the following raw materials in parts by weight: 70-80 parts of modified polypropylene, 15-20 parts of glass fiber microbeads, 15-20 parts of ultrafine active talc powder, 15-20 parts of ultrafine active calcium carbonate, 2-3 parts of compatibilizer, 2-3 parts of toughening agent, and 0-10 parts of masterbatch; The winding layer comprises the following raw materials in parts by weight: 50-60 parts of ultra-high molecular weight polyethylene, 20-30 parts of high-density polyethylene, 10-15 parts of glass fiber microbeads, 5-10 parts of ultra-fine active talc, 0.5-0.8 parts of antioxidant, 1-3 parts of compatibilizer, 1-3 parts of impact modifier, and 0-10 parts of masterbatch; The glass fiber microbeads are prepared by the following steps: Step 1: Acidify the hollow glass microspheres and glass fibers, mix them with a 95% by volume ethanol aqueous solution, add γ-aminopropyltriethoxysilane, heat to 50° C., and stir for 24 hours to obtain an amino filler; the mass ratio of the hollow glass microspheres to the glass fibers is 8:5; Step 2: Diethylenetriamine and methanol are mixed, and methyl acrylate is added while stirring under nitrogen protection and ice-water bath conditions, and the reaction is stirred for 6 hours to obtain a branched intermediate product; wherein the molar ratio of methyl acrylate to diethylenetriamine is 1:1; Step 3: Mix the amino filler and the branched intermediate product, set the temperature to 60°C and stir for 30 minutes, then heat it to 100°C and stir for 2 hours, and then heat it to 130°C and stir for 2 hours to obtain glass fiber microbeads, wherein the mass ratio of the amino filler to the branched intermediate product is 1:5; The compatibilizer is maleic anhydride grafted polypropylene; The modified polypropylene is prepared by the following steps: Add block copolymer polypropylene particles, homopolymer polypropylene particles and EPDM rubber particles into a ball mill, and then use stainless steel grinding balls to ball mill for 3-5 hours to obtain modified polypropylene.

2. The B-type carat tube with high ring stiffness and wound structure wall according to claim 1, characterized in that: The toughening agent is CPE toughening agent; the masterbatch is one of black masterbatch and blue masterbatch; the impact modifier is acrylonitrile-butadiene-styrene copolymer; and the antioxidant is tris(2,4-di-tert-butylphenyl) phosphite.

3. The B-type carat tube with high ring stiffness and wound structure wall according to claim 1, characterized in that: The particle size of the ultrafine active talc powder is ≤6.5 μm, and the particle size of the ultrafine active calcium carbonate is ≤6.5 μm.

4. The B-type carat tube with high ring stiffness wound structure wall according to claim 1, characterized in that: The molecular weight of ultra-high molecular weight polyethylene is 3 million and the density is 0.94g / cm 3 , particle size 60 mesh; the relative density of high-density polyethylene is 0.94-0.96g / cm 3 .

5. The method for preparing a B-type carat tube with a high ring stiffness wound structure wall according to claim 1, characterized in that: The steps include: The first step is to weigh the raw materials for the base tube according to parts by weight, stir and heat the weighed raw materials, and then put them into a screw extruder. The surface temperature of the forming mold is heated to 110-130°C, and then the first mixture extruded from the screw extruder is wrapped around the surface of the forming mold and allowed to cool for 3-5 hours to form the base tube. The second step is to weigh the raw materials for the winding layer according to weight, heat and mix the weighed raw materials, put them into the screw extruder after mixing, heat the molding die again to melt the surface of the base tube, and then wrap the second mixture extruded from the screw extruder around the surface of the base tube, and bond it to the outside of the base tube to form a coating layer. After cooling, a B-type carat tube with a high ring stiffness winding structure wall is obtained.

6. The method for preparing a B-type carat tube with a high ring stiffness wound structure wall according to claim 5, characterized in that: The temperature of heating and mixing in the first step is 200-220°C, and the extrusion temperature in the first step is 180-200°C; the temperature of heating and mixing in the second step is 210-230°C, and the extrusion temperature in the second step is 150-160°C.