Powerful flame-retardant PVC (polyvinyl chloride) pipeline

Abstract

The utility model belongs to the technical field of PVC (polyvinyl chloride) pipes, and particularly relates to a potent flame-retardant PVC pipeline which comprises a pipe body, the pipe body comprises a PVC base layer pipe, a heat-insulating corrosion-resistant layer is arranged on the outer side wall of the PVC base layer pipe, and a flame-retardant layer is arranged on the outer side of the heat-insulating corrosion-resistant layer. An expansion block which expands when meeting fire is embedded in the inner side wall of the PVC base layer pipe, and the expansion block is in an annular shape. The flame-retardant layer is arranged on the outer side wall of the PVC base layer pipe, so that the fire resistance of the PVC pipe in use is improved, the influence of high temperature generated by flames on the interior of the PVC base layer pipe is prevented through the heat-insulating corrosion-resistant layer, the interior of the PVC base layer pipe can be sealed through expansion of the expansion block in case of fire, the flames are prevented from penetrating through the PVC base layer pipe, fire expansion is avoided, and the safety of the PVC pipe in use is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of PVC pipes, in particular to a highly flame-retardant PVC pipe. Background Art

[0002] PVC pipe is a rigid polyvinyl chloride pipe, which is extruded by hot pressing after being compounded with polyvinyl chloride resin, stabilizer, lubricant, etc. It is the earliest developed and applied plastic pipe. Due to the excellent bonding performance, corrosion resistance, small fluid resistance, water tightness, anti-biting, low price and other advantages of PVC pipes, they are widely used in municipal water supply and drainage, industrial water supply and drainage, civil water supply and drainage, irrigation, vegetation watering, chemical and domestic wastewater, chemicals, heating liquids and cooling liquids, food, ultra-pure liquids, mud, gases, compressed air and vacuum systems and other fields.

[0003] However, the current PVC pipes have poor flame-retardant performance, so that in some special environments or under the influence of external flames, the PVC pipes cannot be used continuously, and even the entire pipeline may be damaged, with poor safety, which reduces the further popularization of PVC pipes and affects the practicability of PVC pipes.

[0004] In addition, in the event of a fire, the flames will spread to the other end of the pipeline through the PVC pipe, expanding the fire area.

[0005] In view of the above problems, the present utility model document proposes a highly flame-retardant PVC pipe. Content of the Utility Model

[0006] The utility model provides a highly flame-retardant PVC pipe, which enhances the flame-retardant property and high-temperature resistance of the PVC pipe, and improves the practicability and safety of the PVC pipe in use.

[0007] The utility model provides the following technical solutions:

[0008] A highly flame-retardant PVC pipe includes a pipe body. The pipe body includes a PVC base pipe. An insulating and corrosion-resistant layer is provided on the outer side wall of the PVC base pipe, and a flame-retardant layer is provided on the outer side of the insulating and corrosion-resistant layer; an expansion block that expands when encountering fire is embedded in the inner side wall of the PVC base pipe, and the expansion block is annular.

[0009] Further, a wear-resistant layer is further provided on the outer side of the flame-retardant layer.

[0010] Further, the wear-resistant layer is a carbon fiber layer.

[0011] Further, a sunscreen coating is provided on the surface of the wear-resistant layer.

[0012] Further, the insulating and corrosion-resistant layer is a cross-linked polyethylene layer.

[0013] Further, the flame retardant layer is a polyurethane layer.

[0014] Further, the expansion block is expanded perlite.

[0015] Further, a structural strengthening layer is also provided between the PVC base pipe and the heat insulation and corrosion resistant layer.

[0016] Further, the structural strengthening layer includes a metal wire mesh and a phenolic resin coating, and the metal wire mesh is embedded inside the phenolic resin coating.

[0017] In the present utility model, by providing a flame retardant layer on the outer side wall of the PVC base pipe, the fire resistance of the PVC pipe during use is improved. By means of the heat insulation and corrosion resistant layer, the high temperature generated by the flame is prevented from affecting the inside of the PVC base pipe. When the expansion block encounters fire, it expands and can seal the inside of the PVC base pipe, preventing the flame from passing through the PVC base pipe and causing the fire to spread, thereby improving the safety of the PVC pipeline during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic cross-sectional structure diagram of a highly effective flame retardant PVC pipeline provided by an embodiment of the present utility model.

[0019] Reference numerals:

[0020] 1, PVC base pipe; 2, structural strengthening layer; 201, phenolic resin coating; 202, metal wire mesh; 3, heat insulation and corrosion resistant layer; 4, flame retardant layer; 5, wear-resistant layer; 6, sun protection coating; 7, expansion block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following describes the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model.

[0022] In the description of the embodiments of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "connection", "installation" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. In addition, "communication" can be a direct communication or an indirect communication through an intermediate medium. Among them, "fixing" means that they are connected to each other and the relative positional relationship after connection remains unchanged. The orientation terms mentioned in the embodiments of the present utility model, such as "inside", "outside", "top", "bottom", etc., are only with reference to the direction of the drawings. Therefore, the orientation terms used are for better and clearer description and understanding of the embodiments of the present utility model, 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 thus cannot be understood as a limitation to the embodiments of the present utility model.

[0023] In the embodiments of the present utility model, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0024] In the embodiments of the present utility model, "and / or" merely describes the association relationship of associated objects and indicates that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this text generally indicates that the associated objects before and after are in an "or" relationship.

[0025] The reference to "one embodiment" or "some embodiments" etc. described in this specification means that in one or more embodiments of the present utility model, the specific features, structures or characteristics described in connection with that embodiment are included. Thus, the statements "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments" etc. that appear in different places in this specification do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "comprise", "include", "have" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0026] Embodiment:

[0027] Refer to Figure 1 As shown, a highly effective flame-retardant PVC pipe includes a pipe body. The pipe body includes a PVC base pipe 1. An insulating and corrosion-resistant layer 3 is provided on the outer sidewall of the PVC base pipe 1, and a flame-retardant layer 4 is provided on the outer side of the insulating and corrosion-resistant layer 3. An expansion block 7 that expands when encountering fire is embedded in the inner sidewall of the PVC base pipe 1, and the expansion block 7 is annular.

[0028] The fire resistance of the PVC pipe is improved by the flame-retardant layer 4, and the high temperature generated by the flame can be prevented from affecting the inside of the PVC pipe through the insulating and corrosion-resistant layer 3, thereby improving the safety of using the PVC pipe. Through the expansion block 7 on the inner sidewall of the PVC base pipe 1, when the flame passes through the inside of the PVC base pipe 1, the expansion block 7 expands due to heat, blocking and sealing the inside of the PVC base pipe 1, preventing the flame from passing through the PVC base pipe 1, and further preventing the flame from spreading along the PVC base pipe 1, further improving the flame-retardant effect of the PVC pipe and further improving the safety of using the PVC pipe.

[0029] A wear-resistant layer 5 is further provided on the outer side of the flame-retardant layer 4. The wear-resistant layer 5 prevents the flame-retardant layer 4 from being damaged by friction during the use of the PVC pipe, which may affect the flame-retardant effect, and protects the flame-retardant layer 4 through the wear-resistant layer 5 to ensure the flame-retardant effect of the PVC pipe.

[0030] The wear-resistant layer 5 is a carbon fiber layer. Carbon fiber has excellent wear resistance, can withstand high-temperature environments, and has a long service life. In addition, carbon fiber also has strong corrosion resistance, can well protect the flame-retardant layer 4, and has a low density, making its own mass light and not increasing the load of the PVC base pipe 1.

[0031] A sunscreen coating 6 is provided on the surface of the wear-resistant layer 5. The carbon fiber layer is protected by the sunscreen coating 6 to prevent the carbon fiber from aging due to long-term sunlight exposure, affecting its wear resistance, and then causing the flame-retardant layer 4 to be unprotected and affecting the flame-retardant effect. Further ensure the normal flame-retardant effect of the PVC pipe.

[0032] The heat-insulating and corrosion-resistant layer 3 is a cross-linked polyethylene layer. Cross-linked polyethylene has good heat resistance and strong acid and alkali resistance, can provide good heat-insulating and corrosion-resistant effects, and can well protect the internal PVC base pipe 1, avoiding the influence of high temperature and corrosion on the PVC base pipe 1.

[0033] The flame-retardant layer 4 is a polyurethane layer. The flame-retardant effect of polyurethane is mainly reflected in its ability to effectively delay the spread of fire. Polyurethane has a high flame-retardant grade and can well protect its interior.

[0034] The expansion block 7 is expanded perlite. The volume of expanded perlite expands rapidly by 4 - 30 times when heated, can promptly seal the inside of the PVC base pipe 1, and prevent the fire from spreading from the inside of the PVC pipe.

[0035] A structural strengthening layer 2 is also provided between the PVC base pipe 1 and the heat-insulating and corrosion-resistant layer 3. The compressive capacity of the PVC base pipe 1 is improved through the structural strengthening layer 2.

[0036] The structural strengthening layer 2 includes a metal wire mesh 202 and a phenolic resin coating 201. The metal wire mesh 202 is embedded inside the phenolic resin coating 201. The metal wire mesh 202 is coated on the surface of the PVC base pipe 1 to improve the compressive capacity of the PVC base pipe 1, and the phenolic resin coating 201, as an adhesive, fixes the metal wire mesh 202 on one hand, and on the other hand, the phenolic resin coating 201 has good wear resistance and heat resistance after solidification, further improving the protection of the PVC base pipe 1.

[0037] During use, a metal wire mesh 202 is wrapped around the outside of the PVC base pipe 1 and then fixed by a phenolic resin coating 201. Then, a cross-linked polyethylene layer is provided on the outside of the phenolic resin coating 201, a polyurethane layer is provided on the outside of the cross-linked polyethylene layer, a carbon fiber layer is provided on the outside of the polyurethane layer, and a sunscreen coating 6 is provided on the outside of the carbon fiber layer to improve the flame retardancy of the outside of the PVC base pipe 1, while reducing the influence of the high temperature generated by the flame on the inside of the PVC base pipe 1. At the same time, the polyurethane layer is protected to prevent the PVC base pipe 1 from being used for a long time, causing damage to the polyurethane layer and affecting the flame retardant effect of the PVC base pipe 1; Expanded perlite is embedded in the side wall of the PVC base pipe 1, which can heat-seal the inside of the PVC base pipe 1 to prevent the flame from spreading along the inside of the PVC base pipe 1 and improve the safety of the PVC pipe during use.

[0038] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention; Without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A strong flame-retardant PVC pipe, characterized in that: It comprises a pipe body, which comprises a PVC base pipe. The outer wall of the PVC base pipe is provided with a heat-insulating and corrosion-resistant layer, and the outer side of the heat-insulating and corrosion-resistant layer is provided with a flame-retardant layer; the inner wall of the PVC base pipe is embedded with an expansion block that expands when encountering fire, and the expansion block is ring-shaped.

2. A strong flame-retardant PVC pipe according to claim 1, characterized in that: A wear-resistant layer is also arranged on the outer side of the flame-retardant layer.

3. A strong flame-retardant PVC pipe according to claim 2, characterized in that: The wear-resistant layer is a carbon fiber layer.

4. A strong flame-retardant PVC pipe according to claim 3, characterized in that: The surface of the wear-resistant layer is provided with a sunscreen coating.

5. The strong flame-retardant PVC pipe according to claim 1, characterized in that: The heat-insulating and corrosion-resistant layer is a cross-linked polyethylene layer.

6. A strong flame-retardant PVC pipe according to claim 1, characterized in that: The flame retardant layer is a polyurethane layer.

7. A strong flame-retardant PVC pipe according to claim 1, characterized in that: The expansion block is expanded perlite.

8. The strong flame-retardant PVC pipe according to claim 1, characterized in that: A structural reinforcement layer is also provided between the PVC base pipe and the heat-insulating and corrosion-resistant layer.

9. A strong flame-retardant PVC pipe according to claim 8, characterized in that: The structural reinforcement layer comprises a metal wire mesh and a phenolic resin coating, wherein the metal wire mesh is embedded in the phenolic resin coating.

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