Pipeline sealing film and preparation method thereof

Abstract

The invention relates to the technical field of pipeline repairing materials, and particularly discloses a pipeline sealing film and a preparation method thereof. A pipeline sealing film comprises a base film and an adhesive layer, and the adhesive layer adheres to the base film. The adhesive layer comprises the following raw material components: chloroprene rubber, terpene resin, dioctadecyl phthalate, filler, a coupling agent and a curing agent. The adhesive layer takes chloroprene rubber as a base material, terpene resin is added to improve the viscosity of the adhesive layer, and the added dioctadecyl phthalate has a symmetrical long-chain alkyl ester structure, so that the toughness and viscosity of the adhesive layer can be improved; and the coupling agent is added to improve the compatibility of the filler, the chloroprene rubber and the terpene resin, improve the adhesive force of the adhesive layer to the outer wall of the metal pipe and the outer wall of the plastic pipe, and improve the adhesive force of the adhesive layer to gaps. The curing agent reacts with the chloroprene rubber to vulcanize the chloroprene rubber. The pipeline sealing film can be used for being attached to the outer wall of a pipeline to block leakage points of a gas pipe, keeps good viscosity and toughness for a long time, and is not prone to deformation and falling off.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of pipeline repair materials, in particular to a pipeline sealing film and a preparation method thereof. BACKGROUND

[0002] After a gas pipe leaks, if the pipe is directly replaced without taking other measures due to a long replacement time, a larger leakage may occur, and there are problems of high on-site gas concentration and great construction safety hazards of directly replacing the pipe. Therefore, after a gas pipe leaks, emergency treatment is often needed, and an emergency treatment scheme is generally to quickly block the leakage point by using a sealing material, evacuate personnel, close upstream and downstream gas valves, and then replace the gas pipe after the gas concentration in the operation area is monitored to be below the lower limit of explosion.

[0003] The sealing material for quickly blocking the leakage point of the gas pipe includes polyurethane spray paint, fast-curing epoxy resin or metal repair glue, and the sealing material is directly applied to the outer wall of the pipe to form a continuous and dense blocking material during use. However, the material is prone to deformation under the gas pressure, and is easy to fall off, and the risk of gas leakage again in a short time under the gas pressure is high. SUMMARY

[0004] In view of the problems of the related sealing materials in blocking the leakage point of the gas pipe, the application provides a pipeline sealing film and a preparation method thereof.

[0005] In a first aspect, the application provides a pipeline sealing film, and the following technical scheme is adopted.

[0006] The pipeline sealing film comprises a base film and a glue layer, and the glue layer is adhered to the base film. The glue layer comprises the following raw material components: chloroprene rubber, terpene resin, dioctadecyl phthalate, filler, coupling agent and curing agent.

[0007] By adopting the above technical scheme, the glue layer is based on chloroprene rubber, and terpene resin is added to improve the adhesion of the glue layer. The added dioctadecyl phthalate has a symmetrical long-chain alkyl ester structure, which can improve the toughness and adhesion of the glue layer. The added coupling agent improves the compatibility of the filler, chloroprene rubber and terpene resin, improves the adhesion of the glue layer to the outer wall of the metal pipe and the outer wall of the plastic pipe, and improves the adhesion of the glue layer to the gap. The curing agent reacts with the chloroprene rubber to vulcanize the chloroprene rubber. The pipeline sealing film can be attached to the outer wall of the pipe to block the leakage point of the gas pipe, and can long-term maintain good viscosity and toughness and is not easy to deform and fall off.

[0008] The preferred scheme of the pipeline sealing film is that the mass ratio of each raw material component of the glue layer is: chlorobutyl rubber 20-30 parts, terpene resin 10-15 parts, dioctadecyl phthalate 5-10 parts, filler 5-10 parts, coupling agent 0.5-1 part and curing agent 1-2 parts.

[0009] By adopting the above technical scheme, the glue layer with the above ratio has greater adhesion, strength and toughness to the gas pipe. The sealing film containing the glue layer is attached to the leakage point of the gas pipe, and has strong ability to resist the gas pressure without deformation and falling off.

[0010] The preferred scheme of the pipeline sealing film is that the filler is talc and / or carbon black.

[0011] By adopting the above technical scheme, the talc and / or carbon black improve the hardness and anti-static property of the glue layer by optimizing the material interface structure and mechanical properties, improve the flame retardance of the glue layer, and the talc and carbon black have light shielding property, can block UV radiation, improve the anti-UV performance of the sealing film and protect the cracking area of the repaired pipeline, and maintain the effectiveness of the film material in the sealing stage.

[0012] The preferred scheme of the pipeline sealing film is that the coupling agent is silane coupling agent A-171 and / or silane coupling agent A-172.

[0013] By adopting the above technical scheme, the silane coupling agent A-171 and / or silane coupling agent A-172 as a medium can form a coupling product of organic phase-silane coupling agent-inorganic phase, improve the compatibility of the inorganic phase and the organic phase in the glue layer, and thus improve the strength and toughness of the glue layer.

[0014] The preferred scheme of the pipeline sealing film is that the curing agent is magnesium oxide and / or zinc oxide.

[0015] By adopting the above technical scheme, at room temperature, the magnesium oxide and / or zinc oxide promote the vulcanization of the chlorobutyl rubber. During the vulcanization process: the magnesium oxide reacts with the chlorine atoms in the chlorobutyl rubber to generate magnesium chloride and form a cross-linked structure, thereby improving the mechanical properties and heat resistance of the chlorobutyl rubber; the zinc oxide reacts with the chlorobutyl rubber to generate zinc chloride and form a cross-linked structure. The vulcanization improves the strength and stability of the glue layer.

[0016] The preferred scheme of the pipeline sealing film is that the base film is a polytetrafluoroethylene film.

[0017] By adopting the technical scheme, the polytetrafluoroethylene film is flame-retardant, strong and corrosion-resistant, and is not easy to generate static electricity. The pipeline sealing film is attached to the outside of a gas pipeline leakage point to seal the gas leakage position. The film has strong compression resistance and is not easy to deform, and has good sealing effect. The polytetrafluoroethylene film is prepared by adding an anti-ultraviolet agent and a toughening agent in the preparation process, so that the film has the effects of anti-UV, toughening and anti-tearing, is not easy to melt under light, and is not easy to age and crack. The film can be used in an outdoor light environment and can maintain good sealing effectiveness in a harsh environment.

[0018] In a second aspect, the application provides a preparation method of the pipeline sealing film, and adopts the following technical scheme.

[0019] The preparation method of the pipeline sealing film comprises the following steps: taking materials according to mass ratio, dissolving neoprene, terpene resin, dioctadecyl phthalate and the coupling agent with a solvent, then adding the filler and the curing agent, stirring uniformly, defoaming, and obtaining a glue solution; coating the glue solution on the base film, and coupling reaction at a temperature of 90-100 DEG C, so that the glue solution becomes the glue layer adhered to the base film, and the pipeline sealing film is obtained.

[0020] By adopting the technical scheme, the neoprene, terpene resin, dioctadecyl phthalate and coupling agent are dissolved by the solvent, and then the filler and curing agent are added into the glue solution. The filler is connected with the neoprene, terpene resin and dioctadecyl phthalate through the coupling agent. The glue solution is heated to 90-100 DEG C and can be maintained for 1-2 hours. The curing agent promotes the curing of the neoprene, so that the glue solution fully performs vulcanization reaction, and the strength and stability of the material are improved. The method can avoid the influence of the vulcanization caused by the addition of the vulcanizing agent on the uniform dispersion of the neoprene. The thickness of the base film of the prepared pipeline sealing film can be 0.5-1.5 mm, and the thickness of the glue layer can be 0.3-0.5 mm.

[0021] In the preferred scheme of the preparation method of the pipeline sealing film, the solvent is toluene; and the mass ratio of the neoprene to the solvent is (20-30):(100-150).

[0022] By adopting the technical scheme, the toluene can dissolve the neoprene, terpene resin and dioctadecyl phthalate, and the components are uniformly dispersed in the glue solution.

[0023] In summary, the pipeline sealing film and the preparation method thereof have the following beneficial effects: the pipeline sealing film has strong viscosity, large adhesion to the gas pipe, good strength and toughness, and is not easy to deform under compression. The large adhesion and toughness of the glue layer cooperate with the strength of the base film to promote the pipeline sealing film to seal the pipeline cracks. The preparation method of the pipeline sealing film is simple and convenient to use, and the pipeline sealing film is attached to the position of the gas pipe leakage point to effectively seal the pipeline cracks. Attached Figure Description

[0024] Figure 1 The diagram shows the process flow for preparing the pipe sealing membrane in Examples 1-3. Detailed Implementation

[0025] The technical solutions in the embodiments are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the following embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] Example 1 A method for preparing a pipe sealing membrane, the implementation steps of which are as follows: Figure 1 First, prepare the following materials in parts by weight: 25 parts chloroprene rubber, 12 parts terpene resin, 7 parts dioctadecyl phthalate, 7 parts filler, 0.7 parts coupling agent, 1.5 parts curing agent, and 125 parts solvent. The filler is talc. The coupling agent is silane coupling agent A-171. The curing agent is magnesium oxide. The solvent is toluene.

[0027] Chloroprene rubber, terpene resin, dioctadecyl phthalate, and a coupling agent are dissolved in a solvent, then filler and curing agent are added, stirred until homogeneous, and degassed to obtain an adhesive solution. The adhesive solution is coated onto a base film and held at 95°C for 1.5 hours to allow a coupling reaction to occur. The adhesive solution then forms an adhesive layer that adheres to the base film. After cooling, a pipe sealing membrane is obtained. The base film is a polytetrafluoroethylene (PTFE) membrane with a thickness of 1 mm, and the adhesive layer thickness is 0.4 mm.

[0028] Example 2 A method for preparing a pipe sealing membrane, the implementation steps of which are as follows.

[0029] First, prepare the following materials in parts by weight: 20 parts chloroprene rubber, 15 parts terpene resin, 5 parts dioctadecyl phthalate, 10 parts filler, 0.5 parts coupling agent, 2 parts curing agent, and 100 parts solvent. The filler is carbon black. The coupling agent is silane coupling agent A-172. The curing agent is zinc oxide. The solvent is toluene.

[0030] Chloroprene rubber, terpene resin, dioctadecyl phthalate, and a coupling agent are dissolved in a solvent, then filler and curing agent are added, stirred until homogeneous, and degassed to obtain an adhesive solution. The adhesive solution is coated onto a base film and held at 90°C for 2 hours to allow a coupling reaction to occur. The adhesive solution then forms an adhesive layer that adheres to the base film. Cooling yields a pipe sealing membrane. The base film is a polytetrafluoroethylene (PTFE) membrane. The base film thickness is 0.5 mm, and the adhesive layer thickness is 0.5 mm.

[0031] Example 3 A preparation method of a pipe sealing film is as follows.

[0032] First, the following ingredients are taken by mass fraction: chlorobutyl rubber 30 parts, terpene resin 10 parts, dioctadecyl phthalate 10 parts, filler 5 parts, coupling agent 1 part, curing agent 1 part, and solvent 150 parts. The filler is talc and carbon black in a mass ratio of 1:1. The coupling agent is silane coupling agent A-171 and silane coupling agent A-172 in a mass ratio of 1:1. The curing agent is magnesium oxide and zinc oxide in a mass ratio of 1:1. The solvent is toluene.

[0033] The chlorobutyl rubber, terpene resin, dioctadecyl phthalate, and coupling agent are dissolved in the solvent, and then the filler and curing agent are added and stirred uniformly to remove bubbles to obtain a glue solution. The glue solution is coated on a base film, and a coupling reaction occurs at a temperature of 100°C for 1 hour. The glue solution becomes a glue layer adhered to the base film, and the pipe sealing film is obtained after cooling. The base film is a polytetrafluoroethylene film. The thickness of the base film is 1.5 mm, and the thickness of the glue layer is 0.3 mm.

[0034] Comparative Example 1 This comparative example prepares a pipe sealing film. The only difference between the preparation method of this comparative example and Example 1 is that the dioctadecyl phthalate is replaced by an equal mass of terpene resin.

[0035] A preparation method of a pipe sealing film is as follows.

[0036] First, the following ingredients are taken by mass fraction: chlorobutyl rubber 25 parts, terpene resin 19 parts, filler 7 parts, coupling agent 0.7 parts, curing agent 1.5 parts, and solvent 125 parts. The filler is talc. The coupling agent is silane coupling agent A-171. The curing agent is magnesium oxide. The solvent is toluene.

[0037] The chlorobutyl rubber, terpene resin, and coupling agent are dissolved in the solvent, and then the filler and curing agent are added and stirred uniformly to remove bubbles to obtain a glue solution. The glue solution is coated on a base film, and a coupling reaction occurs at a temperature of 95°C for 1.5 hours. The glue solution becomes a glue layer adhered to the base film, and the pipe sealing film is obtained after cooling. The base film is a polytetrafluoroethylene film. The thickness of the base film is 1 mm, and the thickness of the glue layer is 0.4 mm.

[0038] Comparative Example 2 This comparative example prepares a pipe sealing film. The only difference between the preparation method of this comparative example and Example 2 is that the dioctadecyl phthalate is replaced by an equal mass of chlorobutyl rubber.

[0039] A preparation method of a pipe sealing film is as follows.

[0040] First, take the following mass parts of materials, including chlorobutyl rubber 25 parts, terpene resin 15 parts, filler 10 parts, coupling agent 0.5 parts, curing agent 2 parts, and solvent 100 parts. Among them, the filler is carbon black. The coupling agent is silane coupling agent A-172. The curing agent is zinc oxide. The solvent is toluene.

[0041] After dissolving the chlorobutyl rubber, terpene resin, and coupling agent with the solvent, the filler and curing agent are added, stirred uniformly, and defoamed to obtain a glue solution. The glue solution is coated on the base film, and a coupling reaction occurs at a temperature of 90°C for 2h. The glue solution becomes a glue layer adhered to the base film, and the pipeline sealing film is obtained after cooling. Among them, the base film is a polytetrafluoroethylene film. The thickness of the base film is 0.5mm, and the thickness of the glue layer is 0.5mm.

[0042] Comparative Example 3 This comparative example prepares a pipeline sealing film. The only difference between the preparation method of this comparative example and Example 3 is that the terpene resin is replaced by an equal mass of dioctadecyl phthalate.

[0043] A preparation method of a pipeline sealing film, the implementation steps of which are as follows.

[0044] First, take the following mass parts of materials, including chlorobutyl rubber 25 parts, terpene resin 15 parts, filler 10 parts, coupling agent 0.5 parts, and curing agent 2 parts, and solvent 100 parts. Among them, the filler is carbon black. The coupling agent is silane coupling agent A-172. The curing agent is zinc oxide. The solvent is toluene.

[0045] After dissolving the chlorobutyl rubber, terpene resin, and coupling agent with the solvent, the filler and curing agent are added, stirred uniformly, and defoamed to obtain a glue solution. The glue solution is coated on the base film, and a coupling reaction occurs at a temperature of 90°C for 2h. The glue solution becomes a glue layer adhered to the base film, and the pipeline sealing film is obtained after cooling. Among them, the base film is a polytetrafluoroethylene film. The thickness of the base film is 0.5mm, and the thickness of the glue layer is 0.5mm.

[0046] Comparative Example 4 This comparative example prepares a pipeline sealing film. The only difference between the preparation method of this comparative example and Example 3 is that the chlorobutyl rubber, terpene resin, and dioctadecyl phthalate are replaced by polyurethane. The preparation method of this comparative example includes the following steps.

[0047] A preparation method of a pipeline sealing film, the implementation steps of which are as follows.

[0048] First, take the following quality parts, including polyurethane 50 parts, filler 5 parts, coupling agent 1 part, curing agent 1 part, solvent 150 parts. Among them, the filler is talc and carbon black with a mass ratio of 1:1. The coupling agent is silane coupling agent A-171 and silane coupling agent A-172 with a mass ratio of 1:1. The curing agent is magnesium oxide and zinc oxide with a mass ratio of 1:1. The solvent is toluene.

[0049] After dissolving the polyurethane and the coupling agent with the solvent, the filler and the curing agent are added, stirred uniformly, and defoamed to obtain the glue solution. The glue solution is coated on the base film, and the coupling reaction occurs at 100°C for 1h. The glue solution becomes the glue layer adhered to the base film, and the cooling process obtains the pipe sealing film. Among them, the base film is a polytetrafluoroethylene film. The thickness of the base film is 1.5mm, and the thickness of the glue layer is 0.3mm.

[0050] Test Example 1 The pipe sealing films prepared in Examples 1-3 and Comparative Example 1-4 are tested according to the method of "GB / T 31125-2014 Adhesive Tape Initial Adhesion Test Method Ring Method". The method measures the force required to separate the ring-shaped pipe sealing film from the standard test plate under its own gravity after contacting the standard test plate, to characterize the initial adhesion of the pipe sealing film. The test results are shown in Table 1.

[0051] Table 1 Initial adhesion test Sample origin Initial tack / N Example 1 21.06 Example 2 18.53 Example 3 20.72 Comparative Example 1 8.91 Comparative Example 2 7.14 Comparative Example 3 9.68 Comparative Example 4 5.80 Table 1 shows that the adhesion of the sample of Example 1-3 is much greater than that of the sample of Comparative Example 1-4. Comparative Example 4 uses polyurethane instead of chloroprene rubber, terpene resin, and dioctadecyl phthalate, and has the smallest adhesion. Table 1 shows that the chloroprene rubber, terpene resin, dioctadecyl phthalate, coupling agent, filler, and curing agent used to prepare the glue layer have high adhesion. The lack of terpene resin or dioctadecyl phthalate, or the replacement of chloroprene rubber, terpene resin, and dioctadecyl phthalate with polyurethane, has a significant effect on the adhesion.

[0052] The glue layer is prepared according to the method of preparing the interlayer of Examples 1-3 and Comparative Example 1-4, and the following tests are performed.

[0053] According to "GB3512-2014 Vulcanized Rubber or Thermoplastic Rubber Hot Air Accelerated Aging and Heat Resistance Test": high temperature 100°C for 168h, and then cooled to room temperature to detect the Shore A hardness, tensile strength, and elongation at break before and after the high temperature test.

[0054] According to "GBT15256-2014 Determination of Low Temperature Brittleness of Vulcanized Rubber or Thermoplastic Rubber (Multiple Sample Method)": Procedure A, the temperature at which the sample cracks or a small hole appears when impacted is recorded as the brittleness temperature.

[0055] Table 2 High and low temperature test of glue layer In Table 2, the Shore A hardness change rate of the adhesive layer prepared according to the method of Examples 1-3 before and after high temperature test is 1.3-1.4%, the tensile strength change rate is 1.3-2.8%, and the change rate of elongation at break is 4.7-5.7%. In comparison, the Shore A hardness change rate of the adhesive layer prepared according to the method of Comparative Examples 1-3 before and after high temperature test is -8.3% to -11.6%, the tensile strength change rate is -13.3% to -16.8%, and the change rate of elongation at break is -16.3 to -17.4%. This shows that the adhesive layer of Examples 1-3 has better high temperature resistance and toughness, and has good toughness in high temperature environment and is not easy to deform.

[0056] In Table 2, the low temperature embrittlement temperature of the adhesive layer of Examples 1-3 is -53 to -50℃. The low temperature embrittlement temperature of the adhesive layer of Comparative Examples 1-3 is -43 to -40℃, which is increased by 10℃, indicating that the adhesive layer of Examples 1-3 has better low temperature resistance, and the adhesive layer of Examples 1-3 is relatively not easy to embrittle, and thus is also less likely to crack and fall off.

[0057] The above shows that the adhesive layer of Examples 1-3 is suitable for sealing and repairing the leakage point of gas pipes in winter or summer, in the south or in the north, and has good effect.

[0058] In Table 2, the Shore A hardness change rate of the adhesive layer prepared according to the method of Comparative Example 4 with polyurethane as the base material, dissolved with a solvent and added with fillers, coupling agents and curing agents, is -16.9% before and after high temperature test, the tensile strength change rate is -23.3%, and the change rate of elongation at break is -28.2%. This shows that the adhesive layer prepared according to the scheme of Comparative Example 4 with polyurethane as the base material has weak high temperature resistance and low temperature resistance, and is more likely to deform at high temperature and embrittle at low temperature.

[0059] The scheme for preparing the pipe sealing film of Examples 1-3 uses chloroprene rubber as the base material, terpene resin and dioctadecyl phthalate to improve the adhesion, toughness, high temperature resistance and low temperature resistance, and uses coupling agents to improve the compatibility of fillers and organic phase, and uses curing agents to vulcanize the chloroprene rubber, so that the sealing film obtained by the scheme is applied to pipe repair, for example, attached to the outside of a gas pipe, to block the cracks of the pipe and temporarily prevent the damaged pipe from leaking, facilitating subsequent repair work of replacing the pipe.

[0060] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A pipe sealing membrane, characterized in that, The pipeline sealing film comprises a base film and a glue layer adhered to the base film; the glue layer comprises the following raw material components: chloroprene rubber, terpene resin, dioctadecyl phthalate, filler, coupling agent and curing agent.

2. The pipe sealing membrane according to claim 1, characterized in that The mass ratio of the raw material components of the glue layer is: chloroprene rubber 20-30 parts, terpene resin 10-15 parts, dioctadecyl phthalate 5-10 parts, filler 5-10 parts, coupling agent 0.5-1 part and curing agent 1-2 parts.

3. The pipe sealing membrane according to claim 1, characterized in that, The filler is talcum powder and / or carbon black.

4. The pipe sealing membrane according to claim 1, characterized in that The coupling agent is silane coupling agent A-171 and / or silane coupling agent A-172.

5. The pipe sealing membrane according to claim 1, characterized in that The curing agent is magnesium oxide and / or zinc oxide.

6. The pipe sealing membrane according to claim 1, characterized in that The base film is a polytetrafluoroethylene film.

7. A method of producing a pipe sealing membrane according to any one of claims 1-6, characterized in that, The pipeline sealing film comprises: The chloroprene rubber, terpene resin, dioctadecyl phthalate and the coupling agent are dissolved in a solvent according to the mass ratio, and then the filler and the curing agent are added, stirred uniformly, defoamed to obtain a glue solution; the glue solution is coated on the base film, a coupling reaction occurs at a temperature of 90-100 DEG C, the glue solution becomes the glue layer adhered to the base film to obtain the pipeline sealing film.

8. The method for preparing the pipe sealing membrane according to claim 7, characterized in that, The solvent is toluene; the mass ratio of the chloroprene rubber and the solvent is (20-30):(100-150).

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