Polyvinyl chloride double-color drainage pipe

Abstract

The invention discloses a polyvinyl chloride double-color drainage pipe which comprises a drainage pipe body. The drainage pipe body is prepared from the following raw materials in parts by weight: 100 parts of polyvinyl chloride resin, 8 to 15 parts of thermoplastic polyurethane, 5 to 10 parts of nitrile rubber, 3 to 6 parts of epoxidized soybean oil, 5 to 15 parts of a toughening agent, 10 to 20 parts of a filling agent, 10 to 20 parts of nano silicon dioxide, 1 to 3 parts of a lubricating agent, 2 to 5 parts of an absorbent, 0.5 to 2 parts of pigment, 3 to 8 parts of a silencing agent and 1 to 3 parts of an organic silicon anti-sticking agent. The drainage pipe body made of the raw materials in parts by weight comprises the outer-layer pipe and the inner-layer pipe, the outer-layer pipe and the inner-layer pipe are connected through the bonding layer, and the outer-layer pipe and the inner-layer pipe are formed by extruding polyvinyl chloride materials of different colors. The drainage pipe body provided by the invention is high in strength, high in weather resistance, good in noise reduction effect, good in anti-blocking effect, simple in process and low in cost.

Description

Technical Field

[0001] The present invention relates to the technical field of drainage pipes, and particularly to a polyvinyl chloride two-color drainage pipe. Background Art

[0002] Drainage pipes are pipe bodies used for transporting and discharging liquids such as water sources. Traditional polyvinyl chloride (PVC) drainage pipes have the following problems during use: Insufficient strength: Ordinary PVC drainage pipes have poor impact resistance and compressive resistance, and are prone to cracking during construction or use, affecting the service life and resulting in leakage risks.

[0003] High noise: High-frequency noise (up to 50 - 60 decibels) is generated when water flow collides with the pipe wall at high speed during drainage, affecting the comfort of the living environment, and is not suitable for places with high noise requirements such as hospitals and schools.

[0004] Prone to blockage: The smoothness of the inner wall of the pipe is insufficient, and impurities such as oil stains and hair are easily attached and accumulated, resulting in a reduced pipe diameter, a decrease in drainage efficiency, and even pipe blockage, increasing the maintenance cost.

[0005] Therefore, we propose a polyvinyl chloride two-color drainage pipe to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to address the drawbacks in the prior art and propose a polyvinyl chloride two-color drainage pipe.

[0007] To achieve the above purpose, the present invention adopts the following technical solution: A polyvinyl chloride two-color drainage pipe includes a drainage pipe body. The drainage pipe body is composed of the following raw materials in parts by weight: 100 parts of polyvinyl chloride resin, 8 - 15 parts of thermoplastic polyurethane, 5 - 10 parts of nitrile rubber, 3 - 6 parts of epoxidized soybean oil, 5 - 15 parts of toughening agent, 10 - 20 parts of filler, 10 - 20 parts of nano-silica, 1 - 3 parts of lubricant, 2 - 5 parts of absorbent, 0.5 - 2 parts of pigment, 3 - 8 parts of sound-absorbing agent, 1 - 3 parts of silicone anti-sticking agent; The drainage pipe body made of the above raw materials in parts by weight includes an outer layer pipe and an inner layer pipe. The outer layer pipe and the inner layer pipe are combined to form a two-color drainage pipe, and the outer layer pipe and the inner layer pipe are extruded from polyvinyl chloride materials of different colors, and there is an adhesive layer between the outer layer pipe and the inner layer pipe.

[0008] Preferably, the color contrast between the inner layer pipe and the outer layer pipe is greater than 50%. For example, color combinations with distinct contrasts such as black and white, red and blue can be used, and the thickness ratio of the inner layer pipe to the outer layer pipe is 1:1 to 1:3, and the specific ratio can be adjusted according to actual needs.

[0009] Preferably, the adhesive layer is polyvinyl chloride hot melt adhesive, which is used to firmly bond the inner layer pipe and the outer layer pipe together.

[0010] Preferably, a plurality of noise reduction perforations are formed through the interior of the outer layer pipe, and the plurality of noise reduction perforations are arranged in a circumferential pattern. A plurality of buffer spirals are arranged in a circumferential pattern on the inner wall of the inner layer pipe. The noise reduction perforations can create a hollow sandwich layer between the outer layer pipe and the inner layer pipe. The hollow cavity can increase the resistance to sound penetration, thereby gradually reducing the sound. The buffer spirals form a spiral structure pipe for the inner layer pipe. The buffer spirals are triangular swirl guiding columns, which reduce the collision between the water flow and the pipe wall, effectively reducing the drainage noise inside the pipe. The combined action of the noise reduction perforations and the buffer spirals can better reduce the noise inside the drainage pipe.

[0011] Preferably, a protective spiral is arranged outside the outer layer pipe. The interior of the protective spiral is a cavity, and there are reinforcing spiral ribs inside the protective spiral. The reinforcing spiral ribs divide and support the cavity on the inner wall of the protective spiral, thereby improving the strength of the protective spiral and making the protective support effect of the protective spiral on the drain pipe body better.

[0012] Preferably, the preparation method of the outer layer pipe and the inner layer pipe includes the following steps: S1. Add polyvinyl chloride resins of different colors into two extruders respectively and heat them to melt. S2. Extrude the melted polyvinyl chloride resins through the inner flow channel and the outer flow channel of the co-extrusion die respectively to form the inner layer pipe and the outer layer pipe. S3. At the outlet of the co-extrusion die, bond the inner layer pipe and the outer layer pipe together through the adhesive layer to form a two-color drain pipe.

[0013] Preferably, the toughening agent is chlorinated polyethylene or acrylate copolymer.

[0014] Preferably, the filler is calcium carbonate or talcum powder.

[0015] Preferably, the sound-absorbing agent is rubber particles or inorganic mineral powder.

[0016] Preferably, the anti-sticking agent is silicone oil or calcium stearate.

[0017] Preferably, the inner layer pipe includes an inner layer, a middle layer and an outer layer; The outer layer is a high-strength anti-aging layer, which is composed of a polyvinyl chloride resin material added with epoxy soybean oil, a toughening agent, a filler, and an ultraviolet absorber, and the thickness accounts for 40%-50%; The middle layer is a blend layer of thermoplastic polyurethane / nitrile rubber and a sound-absorbing agent, and the thickness accounts for 30%-40%, which improves the impact resistance and the noise reduction effect; The inner layer is a super-smooth anti-sticking layer, which is composed of PVC material added with nano-silica and silicone anti-sticking agent, with a thickness ratio of 20%-30%, reducing fluid resistance.

[0018] Preferably, the preparation methods of the inner layer, the middle layer and the outer layer include the following steps: S1. Add polyvinyl chloride resin, toughening agent, epoxy soybean oil and pigment into a high-speed mixer, mix at 90-100°C for 5 minutes, add absorbent and continue to mix until uniform to form the outer layer 123; S2. Add thermoplastic polyurethane, nitrile rubber, filler and sound absorber into a mixer according to proportion, dynamically vulcanize at 150-160°C for 10 minutes to form the middle layer of micro-crosslinked elastomer; S3. Add polyvinyl chloride resin, lubricant, silicone anti-sticking agent and nano-silica, mix at 90-100°C for 5 minutes, add silane coupling agent and continue to mix until uniform to form the inner layer; S4. Use three extruders to process the raw materials of the inner layer, the middle layer and the outer layer respectively; Control the temperature of the inner layer: 160-170°C, the temperature of the middle layer 122: 175-185°C, and the temperature of the outer layer: 165-175°C; Control the parameters of the three-layer co-extrusion machine: screw speed: the speed of the outer layer is 25 rpm, the speed of the middle layer is 20 rpm, and the speed of the inner layer is 22 rpm; Die head pressure: the pressure of the outer layer is 12 MPa, the pressure of the middle layer is 10 MPa, and the pressure of the inner layer is 11 MPa; S5. Make the three-layer melt composite through a co-extrusion die head with a split cone structure, and integrally form the three-layer co-extrusion. The production efficiency is increased by 30% compared with the traditional split composite pipe, and the raw material loss is reduced by 15%; S6. Use a segmented vacuum sizing box (water temperature 20-25°C) to gradually cool the pipe to avoid stress concentration.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: By adding a toughening agent and a filler, the ring stiffness is ≥8 kN / m², improving the impact resistance and compressive resistance of the pipe and extending the service life.

[0020] After adding an ultraviolet absorber, the retention rate of the tensile strength remains >90% after 1000 hours of artificial accelerated aging.

[0021] Through the inner layer, noise reduction perforation setting and adding a sound absorber, the drainage noise is reduced to below 35 decibels (ASTM E90 standard), which is more than 40% better than similar products in the market, effectively reducing the noise generated during drainage and improving the comfort of the living environment.

[0022] Through the setting of the inner layer and the smooth treatment of the inner wall surface of the pipe, the inner wall of the pipe becomes smoother. Specifically, the inner layer of nano-silica and silicone work together to make the surface contact angle > 110°, and the dirt adhesion rate is reduced by 70%. In this way, dirt is not easily accumulated, effectively preventing the pipe from being blocked.

[0023] Using the conventional extrusion molding process, the preparation method is simple and easy to realize industrial production. Specifically, the three-layer melt is compounded through the co-extrusion die head with a flow-dividing cone structure, and the three-layer co-extrusion is integrally formed. Compared with the traditional split-type composite pipe, the production efficiency is increased by 30%, and the raw material loss is reduced by 15%. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A perspective view of a polyvinyl chloride two-color drainage pipe proposed by the present invention; Figure 2 is Figure 1 a schematic bottom structure diagram of Figure 3 is Figure 1 a partial enlarged view of part A in Figure 4 is Figure 3 a hierarchical diagram of the inner layer pipe in

[0025] In the figure: 1, pipe body; 11, outer layer pipe; 12, inner layer pipe; 121, inner layer; 122, middle layer; 123, outer layer; 13, noise reduction perforation; 2, protective helix; 3, buffer helix. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0027] In the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings 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.

[0030] Embodiment 1 Reference Figures 1-4 A polyvinyl chloride two-color drainage pipe comprises a drainage pipe body 1, wherein the drainage pipe body 1 comprises an outer layer pipe 11 and an inner layer pipe 12, wherein the outer layer pipe 11 and the inner layer pipe 12 are combined together to form a two-color drainage pipe, and the outer layer pipe 11 and the inner layer pipe 12 are extruded by polyvinyl chloride materials of different colors, and an adhesive layer is provided between the outer layer pipe 11 and the inner layer pipe 12.

[0031] The color contrast between the inner tube 12 and the outer tube 11 is greater than 50%. For example, a contrasting color combination such as black and white, red and blue can be used, and the thickness ratio of the inner tube 12 and the outer tube 11 is 1:1 to 1:3. The specific ratio can be adjusted according to actual needs.

[0032] The bonding layer is a polyvinyl chloride hot melt adhesive, which is used to firmly bond the inner tube 12 and the outer tube 11 together. The toughening agent is chlorinated polyethylene or an acrylic copolymer. The filler is calcium carbonate or talcum powder. The outer layer of polyvinyl chloride toughening and nano-calcium carbonate filling make the ring stiffness ≥8kN / m², and there is no cracking in the drop hammer impact test (0°C). The silencer is rubber particles or inorganic mineral powder, and the anti-sticking agent is silicone oil or calcium stearate.

[0033] A plurality of noise reduction perforations 13 are provided throughout the outer tube 11, and the plurality of noise reduction perforations 13 are arranged in a circle. A plurality of buffer spirals 3 are arranged in a circle on the inner wall of the inner tube 12, wherein the noise reduction perforations 13 can create a hollow interlayer between the outer tube 11 and the inner tube 12, and the resistance to sound penetration can be increased through the hollow compartment, thereby gradually reducing the sound. The buffer spirals 3 make the inner tube 12 form a spiral structure pipe, and the buffer spirals 3 are triangular vortex guide columns, which reduce the collision between the water flow and the tube wall, and effectively reduce the drainage noise in the pipeline. The noise reduction perforations 13 and the buffer spirals 3 work together to better reduce the noise inside the drainage pipeline.

[0034] Example Two Refer to Figures 1-4 , a PVC double - color drainage pipe, including a drainage pipe body 1. The drainage pipe body 1 includes an outer layer pipe 11 and an inner layer pipe 12. A protective helix 2 is arranged outside the outer layer pipe 11. The inside of the protective helix 2 is a cavity, and there are strengthening spiral ribs inside the protective helix 2. The cavity on the inner wall of the protective helix 2 is divided and supported by the strengthening spiral ribs, so as to improve the strength of the protective helix 2, making the protective and supporting effect of the protective helix 2 on the drainage pipe body 1 better. Example Three A PVC double - color drainage pipe, the drainage pipe body 1 includes the following raw materials in parts by weight: 100 parts of polyvinyl chloride resin, 8 - 15 parts of thermoplastic polyurethane, 5 - 10 parts of nitrile rubber, 3 - 6 parts of epoxidized soybean oil, 5 - 15 parts of toughening agent, 10 - 20 parts of filler, 10 - 20 parts of nano - silica, 1 - 3 parts of lubricant, 2 - 5 parts of absorbent, 0.5 - 2 parts of pigment, 3 - 8 parts of sound - absorbing agent, 1 - 3 parts of silicone anti - sticking agent.

[0035] Example Four Based on Example One, Two, and Three, a method for preparing the outer layer pipe 11 and the inner layer pipe 12 of a PVC double - color drainage pipe includes the following steps: S1. Add polyvinyl chloride resins with different pigments into two extruders respectively and heat them to melt. S2. Extrude the melted polyvinyl chloride resins through the inner and outer channels of the co - extrusion die respectively to form the inner layer pipe 12 and the outer layer pipe 11. S3. At the outlet of the co - extrusion die, bond the inner layer pipe 12 and the outer layer pipe 11 together through an adhesive layer to form a double - color drainage pipe.

[0036] Example Five Based on Example One, Two, Three, and Four, a PVC double - color drainage pipe, the inner layer pipe 12 includes an inner layer 121, an intermediate layer 122, and an outer layer 123 arranged from the inside outwards; the outer layer 123 is a high - strength anti - aging layer, which is composed of a polyvinyl chloride resin material added with epoxidized soybean oil, toughening agent, filler, and ultraviolet absorber, and the thickness accounts for 40% - 50%; the intermediate layer 122 is a blend layer of thermoplastic polyurethane / nitrile rubber and sound - absorbing agent, and the thickness accounts for 30% - 40%, improving the impact resistance and noise reduction effect; the inner layer 121 is an ultra - smooth anti - sticking layer, which is composed of a PVC material added with nano - silica and silicone anti - sticking agent, and the thickness accounts for 20% - 30%, reducing the fluid resistance.

[0037] Example Six Based on Example One, Two, Three, Four, and Five, a method for preparing the inner layer 121, the intermediate layer 122, and the outer layer 123 of a PVC double - color drainage pipe includes the following steps: S1. Add polyvinyl chloride resin, toughener, epoxy soybean oil, and pigment into a high-speed mixer, mix at 90 - 100 °C for 5 min, then add the absorbent and continue to mix until uniform to form the outer layer 123. The absorbent is an ultraviolet absorber. After its addition, the tensile strength retention rate is > 90% after 1000 h of artificial accelerated aging; S2. Add thermoplastic polyurethane, nitrile rubber, filler, and sound absorber into a mixer in proportion, dynamically vulcanize at 150 - 160 °C for 10 min to form the intermediate layer 122 of micro-crosslinked elastomer; S3. Add polyvinyl chloride resin, lubricant, silicone anti-sticking agent, and nano-silica into a mixer, mix at 90 - 100 °C for 5 min, then add the silane coupling agent and continue to mix until uniform to form the inner layer 121. The synergistic effect of nano-silica and silicone in the inner layer makes the surface contact angle > 110° and reduces the dirt adhesion rate by 70%; S4. Use three extruders to process the raw materials of the inner layer 121, intermediate layer 122, and outer layer 123 respectively; Control the temperature of the inner layer 121: 160 - 170 °C, the temperature of the intermediate layer 122: 175 - 185 °C, and the temperature of the outer layer 123: 165 - 175 °C; Control the parameters of the three-layer co-extrusion machine: Screw speed: the rotation speed of the outer layer 123 is 25 rpm, the rotation speed of the intermediate layer 122 is 20 rpm, and the rotation speed of the inner layer 121 is 22 rpm; Die head pressure: the pressure of the outer layer 123 is 12 MPa, the pressure of the intermediate layer 122 is 10 MPa, and the pressure of the inner layer 121 is 11 MPa; S5. Make the three-layer melts composite through a co-extrusion die head with a flow splitter cone structure, and form the three-layer co-extrusion integrally. The production efficiency is increased by 30% compared with the traditional split composite pipe, and the raw material loss is reduced by 15%; S6. Use a segmented vacuum sizing box (water temperature 20 - 25 °C) to gradually cool the pipe to avoid stress concentration; S7. Coat the outermost surface of the pipe with a fluorosilicone resin protective coating (thickness 10 - 20 μm) and cure at 80 °C for 30 min; S8. The inner wall of the pipe in direct contact with the liquid at the innermost layer forms a nano-level smooth surface (roughness ≤ 0.2 μm) through the plasma spraying process.

[0038] The above embodiments are the preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A polyvinyl chloride two-color drainage pipe, comprising a drainage pipe body (1), characterized in that, The drainage pipe body (1) comprises the following raw materials in parts by weight: 100 parts of polyvinyl chloride resin, 8-15 parts of thermoplastic polyurethane, 5-10 parts of nitrile rubber, 3-6 parts of epoxy soybean oil, 5-15 parts of toughening agent, 10-20 parts of filler, 10-20 parts of nano silicon dioxide, 1-3 parts of lubricant, 2-5 parts of absorbent, 0.5-2 parts of pigment, 3-8 parts of muffler, and 1-3 parts of silicone anti-adhesive agent; The drainage pipe body (1) made from the above raw materials in parts by weight comprises an outer layer pipe (11) and an inner layer pipe (12), wherein the outer layer pipe (11) and the inner layer pipe (12) are extruded from polyvinyl chloride materials of different colors, and an adhesive layer is provided between the outer layer pipe (11) and the inner layer pipe (12).

2. A polyvinyl chloride two-color drainage pipe according to claim 1, characterized in that, The color contrast between the inner tube (12) and the outer tube (11) is greater than 50%, and the thickness ratio between the inner tube (12) and the outer tube (11) is 1:1 to 1:

3.

3. A polyvinyl chloride two-color drainage pipe according to claim 1, characterized in that, The bonding layer is a polyvinyl chloride hot melt adhesive and is used to firmly bond the inner layer tube (12) and the outer layer tube (11) together.

4. A polyvinyl chloride two-color drainage pipe according to claim 1, characterized in that, The outer layer tube (11) is provided with a plurality of noise reduction holes (13) penetrating therein, and the plurality of noise reduction holes (13) are arranged in a circumferential manner, and the inner wall of the inner layer tube (12) is provided with a plurality of buffer spirals (3) arranged in a circumferential manner.

5. A polyvinyl chloride two-color drainage pipe according to claim 1, characterized in that A protective spiral (2) is arranged outside the outer layer tube (11), the interior of the protective spiral (2) is a cavity, and the interior of the protective spiral (2) is provided with reinforcing spiral ribs, and the cavity of the inner wall of the protective spiral (2) is divided and supported by the reinforcing spiral ribs.

6. A method for preparing a polyvinyl chloride two-color drainage pipe according to any one of claims 1-5, characterized in that, The method for preparing an outer layer tube (11) and an inner layer tube (12) specifically comprises the following steps: S1. Add polyvinyl chloride resins of different colors into two extruders respectively and heat and melt them; S2, extruding the molten polyvinyl chloride resin through the inner layer flow channel and the outer layer flow channel of the co-extrusion die respectively to form an inner layer tube (12) and an outer layer tube (11); S3. At the outlet of the co-extrusion die, the inner layer tube (12) and the outer layer tube (11) are bonded together through an adhesive layer to form a two-color drainage pipe.

7. A polyvinyl chloride two-color drainage pipe according to claim 1, characterized in that, The toughening agent is chlorinated polyethylene or an acrylic copolymer.

8. A polyvinyl chloride two-color drainage pipe according to claim 1, characterized in that, The filler is calcium carbonate or talcum powder, the muffler is rubber particles or inorganic mineral powder, and the anti-sticking agent is silicone oil or calcium stearate.

9. A polyvinyl chloride two-color drainage pipe according to claim 1, characterized in that, The inner layer tube (12) comprises an inner layer (121), a middle layer (122) and an outer layer (123); The outer layer (123) is a high-strength anti-aging layer, which is made of a polyvinyl chloride resin material to which epoxy soybean oil, a toughening agent, a filler, and an ultraviolet absorber are added, and the thickness accounts for 40%-50%; The middle layer (122) is a blended layer of thermoplastic polyurethane / nitrile rubber and a sound-absorbing agent, with a thickness of 30%-40%, which improves impact resistance and noise reduction effects; The inner layer (121) is an ultra-smooth anti-adhesive layer, which is made of PVC material with nano-silicon dioxide and silicone anti-adhesive agent added, and has a thickness of 20%-30%, thereby reducing fluid resistance.

10. A method for preparing a polyvinyl chloride two-color drainage pipe according to any one of claims 1-9, characterized in that, The preparation method includes an inner layer (121), an intermediate layer (122) and an outer layer (123), and specifically includes the following steps: S1. Add polyvinyl chloride resin, toughening agent, epoxy soybean oil, and pigment into a high-speed mixer, mix at 90 - 100 °C for 5 min, add absorbent and continue mixing until uniform to form the outer layer (123); S2. Add thermoplastic polyurethane, nitrile rubber, filler, and sound absorber into a mixer mill in proportion, dynamically vulcanize at 150 - 160 °C for 10 min to form the middle layer (122) of micro-crosslinked elastomer; S3. Add polyvinyl chloride resin, lubricant, silicone anti-sticking agent, and nano-silica into a mixer, mix at 90 - 100 °C for 5 min, add silane coupling agent and continue mixing until uniform to form the inner layer (121); S4. Use three extruders to process the raw materials of the inner layer (121), middle layer (122), and outer layer (123) respectively; Control the temperature of the inner layer (121): 160 - 170 °C, the temperature of the middle layer (122): 175 - 185 °C, and the temperature of the outer layer (123): 165 - 175 °C; Control the parameters of the three-layer co-extrusion machine: screw speed: the speed of the outer layer (123) is 25 rpm, the speed of the middle layer (122) is 20 rpm, and the speed of the inner layer (121) is 22 rpm; Die head pressure: the pressure of the outer layer (123) is 12 MPa, the pressure of the middle layer (122) is 10 MPa, and the pressure of the inner layer (121) is 11 MPa; S5. Make the three-layer melts composite through a co-extrusion die head with a flow splitter cone structure, and integrally form the three-layer co-extrusion; S6. Use a segmented vacuum sizing box to gradually cool the pipe to avoid stress concentration.

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