PFAS-free threaded opening sealing tape

Abstract

A PFAS-free thread sealing tape comprises a basic material and a sealant, PFAS-free PET, PP, PE and other engineering plastics are adopted as the basic material and subjected to puffing treatment to be made into fibers, then the fibers are made into cloth or threads, the sealant is made of polysiloxane compounds, calcium carbonate, a coupling agent and hydrocarbon synthetic glue as raw materials, and the sealing tape is made of polyurethane resin. The PFAS-free sealing tape or sealing line is prepared by compounding the PFAS-free sealing tape or sealing line on fibers, and the PFAS-free sealing tape or sealing line is good in performance, does not naturally cure due to the fact that the surface of the PFAS-free sealing tape or sealing line has micro viscosity, and can be used for a long time.

Description

Technical Field

[0001] The invention relates to the technical field of threaded thread sealing tapes, and in particular to a threaded thread sealing tape that does not contain PFAS. Background Art

[0002] Polytetrafluoroethylene raw tape (PTFE raw tape) currently used for threaded thread sealing is the most commonly used sealing material in threaded thread sealing materials. However, since PTFE raw tape falls within the range of PFAS, and PFAS is being studied and discussed internationally, its production and use will be restricted due to its non-degradability.

[0003] People exposed to PFAS compounds have an increased risk of thyroid cancer, and those with higher PFAS levels are less likely to become pregnant or give birth. This chemical can cross the placental barrier into the fetus, increasing the risk of malformations and affecting fertility. In addition, PFAS may be related to health problems such as neurotoxicity and skin problems. If production is not restricted, it will accumulate in nature day by day, which will have an increasingly serious impact on the human living environment. Summary of the invention

[0004] The present invention aims at the deficiencies in the prior art and provides a threaded thread sealing tape that does not contain PFAS.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A PFAS-free threaded thread sealing tape comprises a basic material and a sealant, wherein the sealant is compounded on the surface of the basic material; the sealant is specially prepared and does not contain PFAS components; the sealant is prepared to have a slight viscosity, the basic material is made of engineering plastics, and the engineering plastics include at least one of PET, PE, and PP that do not contain PFAS.

[0007] Preferably, the engineering plastic is processed into a film and then subjected to expansion treatment.

[0008] Preferably, the film thickness is 30 μm-300 μm, and the film density is expanded to 0.1 g / mm 3 -0.6g / mm 3 between.

[0009] Preferably, the engineering plastic is processed into fibers with a diameter of 1 μm-50 μm, and the fibers are used to prepare cloth with a thickness of 30 μm-150 μm; and the cloth is then cut into pieces.

[0010] Preferably, the engineering plastic is processed into fibers with a diameter of 1 μm-50 μm, the fibers are used to prepare sealing threads of 0.2-0.5 g / m, and the sealing threads are then woven into the fibers.

[0011] Preferably, the temperature of the sealant is controlled at 60°C-120°C when compounded on the fiber.

[0012] Preferably, the sealant is prepared by mixing polysiloxane compound, calcium carbonate, coupling agent and hydrocarbon synthetic adhesive in a mixing tank in the following proportions: 20-70%, 15-60%, 0.2-1.5% and 5-50%.

[0013] Preferably, the mixing tank is provided with a temperature of 60°C-120°C and stirred at a high speed.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] PFAS-free PET, PP, PE and other engineering plastics are used as basic materials, which are expanded to form fibers, and then the fibers are prepared into cloth or thread. The sealant is made of polysiloxane compounds, fillers, coupling agents and hydrocarbon synthetic rubber as raw materials, compounded on the fibers of the cloth or thread to prepare PFAS-free sealing tapes and sealing threads. The PFAS-free sealing tapes or sealing threads have good performance, and the surface has a relatively low viscosity and will not naturally solidify, and can be used for a long time. DETAILED DESCRIPTION

[0016] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be used for other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0017] Embodiment 1:

[0018] A PFAS-free thread seal tape, comprising a basic material and a sealant;

[0019] The basic materials are engineering plastics such as PET, PE, PP, etc. that do not contain PFAS. The basic materials are processed into films with a thickness of 30μm-50μm, and then expanded to a density of 0.1g / mm 3 -0.6g / mm 3 The expanded basic material is processed into fibers with a diameter of 1μm-50μm; the fibers are prepared into fabrics with a thickness of 30μm-150μm; a special PFAS-free sealant is compounded on the surface of the fabric; and the fabric is cut into PFAS-free sealing tapes with a width of 3mm-50mm according to market needs. The strength of these PFAS-free sealing tapes is controlled at 0.6kg / mm 2 -2kg / mm 2, so that it can be easily torn by hand during operation.

[0020] In this embodiment, the sealant is made of polysiloxane compound, calcium carbonate, coupling agent and hydrocarbon synthetic rubber as raw materials, which are mixed in a mixing tank at a temperature of 60°C-120°C; the polysiloxane compound accounts for 20%-70%, the calcium carbonate accounts for 15%-60%, the coupling agent accounts for 0.2%-1.5%, and the hydrocarbon synthetic rubber accounts for 5%-50%; the mixing tank provides stirring at a rate of 300r / min for 15min. The prepared sealant adheres to the surface of the cloth made of the basic material and penetrates into the inside of the film made of the above-mentioned fiber to achieve a good sealing effect.

[0021] This sealant can combine well with basic materials and its performance will not change after long-term storage. This sealant will not naturally cure or age. It has a slight viscosity on the surface and is easy to use and operate.

[0022] Embodiment 2:

[0023] A PFAS-free thread seal wire, including basic materials and sealant;

[0024] The basic materials are engineering plastics such as PET, PE, PP, etc. that do not contain PFAS. The basic materials are processed into films with a thickness of 30μm-50μm, and then expanded to a density of 0.1g / mm 3 -0.6g / mm 3 The expanded fibers are then prepared into fibers with a diameter of 1 μm-50 μm; the fibers are prepared into wires of 0.2 g / m-0.5 g / m; and the sealant is compounded around the fibers to form a PFAS-free sealing wire.

[0025] In this embodiment, the sealant is prepared by mixing polysiloxane compound, calcium carbonate, coupling agent and hydrocarbon synthetic rubber as raw materials in a mixing tank at a temperature of 120°C; the polysiloxane compound accounts for 20%-70%, the calcium carbonate accounts for 15%-60%, the coupling agent accounts for 0.2%-1.5%, and the hydrocarbon synthetic rubber accounts for 5%-50%; the mixing tank provides stirring at a rate of 300r / min for 15min, and the four raw materials are evenly combined together. The concentration and viscosity are suitable for fiber surface coating processing, so that the sealant is well combined with all fibers and the finished product has a slight viscosity.

[0026] Among them, the sealing line in Example 2 can be woven into a 3mm-50mm PFAS-free sealing belt.

[0027] Experimental Example 1:

[0028] According to the preparation method in Example 1 or 2, 9 kinds of sealants with different proportions were prepared, and the proportions were as follows:

[0029] Ratio 1: The sealant is made by mixing polysiloxane compound, calcium carbonate, coupling agent, and hydrocarbon synthetic glue in the proportions of 50%, 30%, 1%, and 19%;

[0030] Ratio 2: The sealant is made by mixing polysiloxane compound, calcium carbonate, coupling agent, and hydrocarbon synthetic glue in the proportions of 40%, 45%, 0.5%, and 14.5%;

[0031] Ratio 3: The sealant is made by mixing polysiloxane compound, calcium carbonate, coupling agent, and hydrocarbon synthetic glue in the proportions of 60%, 25%, 1.2%, and 13.8%;

[0032] Ratio 4: The sealant is made by mixing polysiloxane compound, calcium carbonate, coupling agent, and hydrocarbon synthetic glue in the proportions of 25%, 55%, 0.2%, and 19.3%;

[0033] Ratio 5: The sealant is made by mixing polysiloxane compound, calcium carbonate, coupling agent, and hydrocarbon synthetic glue in the proportions of 70%, 15%, 1.5%, and 13.5%;

[0034] Ratio 6: The sealant is made by mixing polysiloxane compound, calcium carbonate, coupling agent, and hydrocarbon synthetic glue in the proportions of 30%, 60%, 0.8%, and 9.2%;

[0035] Ratio 7: The sealant is made by mixing polysiloxane compound, calcium carbonate, coupling agent, and hydrocarbon synthetic glue in the proportions of 55%, 35%, 0.9%, and 8.6%;

[0036] Ratio 8: The sealant is made by mixing polysiloxane compound, calcium carbonate, coupling agent, and hydrocarbon synthetic glue in the proportions of 65%, 20%, 1.0%, and 14%;

[0037] Ratio 9: The sealant is made by mixing polysiloxane compound, calcium carbonate, coupling agent, and hydrocarbon synthetic glue in the proportions of 28%, 50%, 0.4%, and 21.6%;

[0038] According to the preparation method in Example 1, PE without PFAS components is used as the basic material according to the following process: film thickness is 30 μm--film density is 0.6 g / mm3--fiber diameter is 1 μm--cloth thickness is 30 μm.

[0039] According to market demand, 9 50mm sealing tapes were cut and compounded with sealants in a ratio of 1-9, and marked as sample 1 to sample 9. The test was carried out using a tensile testing machine at a temperature of 25°C and a tensile rate of 50mm / min. The test results are shown in Table 1:

[0040] Table 1. Test results of tensile strength of sealing tape with slight viscosity

[0041]

[0042] From Table 1, we can see that the strength of the sealing tape is controlled at 0.6kg / mm 2 -2kg / mm 2 , so that it can be easily torn by hand during operation.

[0043] Experimental Example 2:

[0044] According to the basic material preparation method of Example 1 and the sealant prepared with the ratio 1 in the sealing tape composite experiment example 1, the samples to be tested are prepared as follows:

[0045] Sample 1: film thickness 30 μm, film density 0.6 g / mm3, fiber diameter 1 μm, fabric thickness 30 μm;

[0046] Sample 2: film thickness 150 μm, film density 0.6 g / mm3, fiber diameter 30 μm, fabric thickness 90 μm;

[0047] Sample 3: film thickness 300 μm, film density 0.6 g / mm3, fiber diameter 50 μm, fabric thickness 150 μm;

[0048] According to the basic material preparation method of Example 2 and the sealant prepared with the ratio 1 in the sealing tape composite experiment example 1, the samples to be tested are prepared as follows:

[0049] Sample 4: film thickness 30 μm, film density 0.6 g / mm3, fiber diameter 1 μm, sealing line 0.2 g / m;

[0050] Sample 5: film thickness 150μm, film density 0.6g / mm3, fiber diameter 30μm, sealing line 0.3g / m;

[0051] Sample 6: film thickness 300 μm, film density 0.6 g / mm3, fiber diameter 50 μm, sealing line 0.5 g / m;

[0052] Comparative sample: PTFE tape purchased from the market (containing PFAS ingredients);

[0053] 1. Leakage test: use standard sealing test equipment to test within the pressure range of 0.1MPa-1.0MPa.

[0054] PFAS-free sealing tape: Demonstrated good sealing with no leakage at all tested pressures.

[0055] PFAS-containing sealing tape: Also showed excellent sealing at all tested pressures.

[0056] 2. Temperature resistance test: place the sealing tape sample in a temperature environment of -40℃-150℃ and observe its performance changes. The test results are as follows:

[0057] PFAS-free sealing tape: stable performance in the range of -40℃-120℃, slight deformation at 150℃ but still maintains sealing.

[0058] Sealing tape containing PFAS: Maintains stable performance over a wider temperature range (-40℃-150℃) with no significant changes.

[0059] 3. Corrosion resistance test: place the sealing tape sample in 5% hydrochloric acid, sodium hydroxide and sodium chloride solution and soak for 48 hours. Test results:

[0060] PFAS-free sealing tape: No obvious corrosion was observed in the three corrosive media, and it remained intact.

[0061] Sealing tape containing PFAS: also showed excellent corrosion resistance, with no significant changes.

[0062] 4. Tensile strength test: According to the standard tensile test method, the sealing tape is subjected to a tensile test. The test results are as follows:

[0063] PFAS-free sealing tape: The tensile strength is 25MPa, which meets the use requirements.

[0064] Sealing tape containing PFAS: The tensile strength is slightly higher, at 29 MPa (4 MPa higher than the sealing tape without PFAS).

[0065] Those skilled in the art should understand that the embodiments of the present invention shown in the above description are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A PFAS-free thread seal tape, characterized in that: It comprises a basic material and a sealant, wherein the sealant is compounded on the surface of the basic material; The base material is specially formulated to be free of PFAS components, and the sealant is prepared to have a slight viscosity; The basic material is made of engineering plastics, and the engineering plastics include at least one of PET, PE, and PP.

2. The PFAS-free thread seal tape according to claim 1, characterized in that: The basic material is processed into a film and then subjected to a puffing process.

3. The PFAS-free thread seal tape according to claim 2, characterized in that: The film thickness is 30 μm-300 μm, and the film density is expanded to 0.1 g / mm 3 -0.6g / mm 3 between.

4. The PFAS-free thread seal tape according to claim 3, characterized in that: The basic material is processed into fibers with a diameter of 1 μm-50 μm, and the fibers are used to prepare cloth with a thickness of 30 μm-150 μm; and the cloth is cut into pieces.

5. The PFAS-free thread seal tape according to claim 3, characterized in that: The basic material is processed into fibers with a diameter of 1 μm-50 μm, and sealing threads of 0.2 g / m-0.5 g / m are prepared from the fibers; and the sealing threads are woven into the product.

6. A PFAS-free thread seal tape according to claim 4 or 5, characterized in that: The temperature of the sealant is controlled at 60° C.-120° C. and compounded on the fiber.

7. The PFAS-free thread seal tape according to claim 1, characterized in that: The sealant is prepared by mixing polysiloxane compound, calcium carbonate, coupling agent and hydrocarbon synthetic glue in a mixing tank according to the proportions of 20%-70%, 15%-60%, 0.2%-1.5% and 5%-50%.

8. The PFAS-free thread seal tape according to claim 7, characterized in that: The mixing tank is provided with a temperature of 60°C-120°C and stirred at a rate of 120r / min-300r / min.

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