Antistatic double-layer composite rubber and plastic foaming thermal insulation material and preparation method thereof

Abstract

The invention relates to an antistatic double-layer composite rubber and plastic foaming thermal insulation material and a preparation method thereof. The antistatic double-layer composite rubber and plastic foaming thermal insulation material comprises a thermal insulation layer and an antistatic functional layer arranged on the thermal insulation layer, the antistatic functional layer is prepared from the following components in parts by mass: 3 to 15 parts of NBR (nitrile butadiene rubber), 0 to 12 parts of PVC (polyvinyl chloride), 1 to 22 parts of functional polymer, 8 to 20 parts of plasticizer, 8 to 13 parts of foaming agent, 5 to 33 parts of filler, 8 to 40 parts of flame retardant, 0.05 to 1 part of accelerant, 0.01 to 2 parts of vulcanizing agent and 1 to 5 parts of antistatic aid; the thermal insulation layer is prepared from the following components in parts by mass: 12 to 15 parts of NBR (nitrile butadiene rubber), 8 to 12 parts of PVC (polyvinyl chloride), 8 to 20 parts of plasticizer, 8 to 13 parts of foaming agent, 5 to 33 parts of filler, 8 to 40 parts of flame retardant, 0.05 to 1 part of accelerant and 0.01 to 2 parts of vulcanizing agent. The problems that in the related technology, when a rubber and plastic heat preservation material is used for heat preservation of a ventilation pipeline of an electronic clean room, dust is easily adsorbed, the adsorbed dust is difficult to remove, and the requirement of a clean workshop is difficult to meet can be solved.

Description

Technical Field

[0001] The present application relates to the field of rubber and plastic foaming materials, and particularly relates to an antistatic double-layer composite rubber and plastic foaming thermal insulation material and a preparation method thereof. Background Art

[0002] The rubber and plastic (NBR / PVC) thermal insulation material is made of nitrile rubber, polyvinyl chloride, etc. with excellent wear resistance, heat resistance and flame retardancy as the main raw materials, and is added with vulcanizing agents and foaming agents and formed through internal mixing, vulcanization and foaming. It is a flexible foam heat insulation material containing a large number of tiny independent bubbles. It can be widely used for heat insulation of various cold and hot medium pipelines and containers in fields such as central air conditioners, buildings, chemical industries, medicine, light textiles, metallurgy, ships, and electricity, and can achieve excellent effects of reducing cold and heat losses. It can also be processed into grips and sheaths of fitness equipment, medical devices and daily necessities.

[0003] Currently, the improvement of rubber and plastic thermal insulation materials mainly focuses on increasing their service life. For example, Chinese Patent Application Publication No. CN106496862A discloses a masterbatch for rubber and plastic foaming thermal insulation materials and a method for preparing rubber and plastic foaming thermal insulation materials. A mixture of one or two of butyl rubber and ethylene propylene diene monomer rubber is used as an anti-aging modifier, and dipropylheptyl phthalate is used as an anti-aging plasticizer, and the anti-aging performance is significantly improved, and its elasticity can be maintained for a long time without cracking, thus increasing the service life.

[0004] However, when the rubber and plastic thermal insulation material is used for heat insulation of ventilation pipes in electronic clean rooms, it is easy to adsorb dust, and the adsorbed dust is difficult to remove, making it difficult to meet the requirements of clean workshops. Summary of the Invention

[0005] The embodiments of the present application provide an antistatic double-layer composite rubber and plastic foaming thermal insulation material and a preparation method thereof to solve the problem that when the rubber and plastic thermal insulation material is used for heat insulation of ventilation pipes in electronic clean rooms in the related art, it is easy to adsorb dust, the adsorbed dust is difficult to remove, and it is difficult to meet the requirements of clean workshops.

[0006] In a first aspect, an antistatic double-layer composite rubber and plastic foaming thermal insulation material is provided, which includes a thermal insulation layer and an antistatic functional layer provided on the thermal insulation layer;

[0007] Calculated by mass, the antistatic functional layer includes: 3-15 parts of NBR, 0-12 parts of PVC, 1-22 parts of functional high polymer, 8-20 parts of plasticizer, 8-13 parts of foaming agent, 5-33 parts of filler, 8-40 parts of flame retardant, 0.05-1 part of accelerator, 0.01-2 parts of vulcanizing agent, and 1-5 parts of antistatic auxiliary agent;

[0008] Calculated by mass parts, the thermal insulation layer includes: 12-15 parts of NBR, 8-12 parts of PVC, 8-20 parts of plasticizer, 8-13 parts of foaming agent, 5-33 parts of filler, 8-40 parts of flame retardant, 0.05-1 part of accelerator, and 0.01-2 parts of vulcanizing agent.

[0009] In some embodiments, the antistatic additive includes at least one of an ionic antistatic agent and a polymeric permanent antistatic agent.

[0010] In some embodiments, the functional polymer includes at least one of ACM, AEM, AU, EU, BR, BIIR, CIIR, ECO, EPM, EDPM, EVM, SBR, NBR, FKM, PM, IR, NR, PE, PP, PET, PBT, PC, PA, PU, PTFE, PMMA.

[0011] In some embodiments, the plasticizer includes at least one of chlorinated paraffin, tricresyl phosphate, DOP, DINP, and paraffin oil.

[0012] In some embodiments, the foaming agent includes at least one of an organic foaming agent and an inorganic foaming agent.

[0013] In some embodiments, the filler includes at least one of carbon black, white carbon black, talcum powder, kaolin, titanium dioxide, and calcium carbonate.

[0014] In some embodiments, the flame retardant includes at least one of aluminum hydroxide, magnesium hydroxide, molybdenum oxide, ammonium octamolybdate, antimony trioxide, and zinc borate.

[0015] In some embodiments, the accelerator includes at least one of DPTT, PZ, ZnO, and ZBS.

[0016] In some embodiments, the vulcanizing agent includes S.

[0017] In a second aspect, a method for preparing the antistatic double-layer composite rubber and plastic foamed thermal insulation material as described above is provided, which includes the following steps:

[0018] 101. Prepare the masterbatch:

[0019] For the antistatic functional layer: First, put NBR into the internal mixer for pre-mixing for a period of time, then add PVC, functional polymer, plasticizer, foaming agent, filler, flame retardant, and antistatic additive into the internal mixer and carry out mixing; then the discharged rubber compound is passed through the two-roll mill several times thinly, sheeted out, and air-cooled to obtain the masterbatch of the antistatic functional layer.

[0020] For the thermal insulation layer: First, put NBR into the internal mixer for pre-mixing for a period of time, then add PVC, plasticizer, foaming agent, filler, and flame retardant into the internal mixer and carry out mixing; then the discharged rubber compound is passed through the two-roll mill several times thinly, sheeted out, and air-cooled to obtain the preliminary refined rubber of the thermal insulation layer;

[0021] 102. Preparation of the final refined rubber:

[0022] For the antistatic functional layer: Weigh the preliminary refined rubber of the antistatic functional layer, accelerator, and vulcanizing agent, put them into the internal mixer, mix for a period of time and then discharge the rubber. The discharged rubber compound is passed through the two-roll mill several times thinly, sheeted out, and air-cooled to obtain the final refined rubber of the antistatic functional layer;

[0023] For the thermal insulation layer: Weigh the preliminary refined rubber of the thermal insulation layer, accelerator, and vulcanizing agent, put them into the internal mixer, mix for a period of time and then discharge the rubber. The discharged rubber compound is passed through the two-roll mill several times thinly, sheeted out, and air-cooled to obtain the final refined rubber for thermal insulation;

[0024] 103. Extrusion molding: Co-extrude the final refined rubbers of the thermal insulation layer and the antistatic functional layer to obtain a semi-finished sheet or pipe with the thermal insulation layer and the antistatic functional layer integrally formed;

[0025] 104. Vulcanization and foaming: Send the sheet or pipe into the vulcanization furnace for vulcanization and foaming;

[0026] 105. Cooling, cutting, and packaging: After being taken out of the furnace, it is cooled in a water tank, air-dried, cut, and then packaged.

[0027] The beneficial effects brought by the technical solution provided in this application include:

[0028] After adding antistatic additives in this application, the surface resistance and surface resistivity can be greatly reduced, making the antistatic effect of the thermal insulation material very good. Thus, it can solve the problem that when the rubber and plastic thermal insulation material in the related technology is used for the thermal insulation of the ventilation duct in the electronic clean room, it is easy to adsorb dust, and the adsorbed dust is difficult to remove, making it difficult to meet the requirements of the clean workshop. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0030] Figure 1 It is a flowchart for the preparation of the antistatic double-layer composite rubber and plastic foamed thermal insulation material provided in the embodiments of this application. Detailed Embodiments

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0032] An antistatic double-layer composite rubber and plastic foamed thermal insulation material is provided in an embodiment of this application. It includes two layers of structures, and the two layers of structures include a thermal insulation layer and an antistatic functional layer. Both the thermal insulation layer and the antistatic functional layer are rubber and plastic foamed materials; the thermal insulation layer and the antistatic functional layer are integrally formed by co-extrusion and vulcanization foaming, and the antistatic functional layer and the thermal insulation layer are an integral structure.

[0033] Calculated by mass, the antistatic functional layer includes: 3 to 15 parts of NBR, 0 to 12 parts of PVC, 1 to 22 parts of functional high polymer, 8 to 20 parts of plasticizer, 8 to 13 parts of foaming agent, 5 to 33 parts of filler, 8 to 40 parts of flame retardant, 0.05 to 1 part of accelerator, 0.01 to 2 parts of vulcanizing agent, and 1 to 5 parts of antistatic auxiliary agent.

[0034] Calculated by mass, the thermal insulation layer includes: 12 to 15 parts of NBR, 8 to 12 parts of PVC, 8 to 20 parts of plasticizer, 8 to 13 parts of foaming agent, 5 to 33 parts of filler, 8 to 40 parts of flame retardant, 0.05 to 1 part of accelerator, and 0.01 to 2 parts of vulcanizing agent.

[0035] See Figure 1 as shown, and its preparation method includes the following steps:

[0036] 101. Preparation of masterbatch:

[0037] For the antistatic functional layer: First, put NBR into a kneader and pre-knead for a period of time, the length of which is set according to actual needs. For example, as an example, it can be set to 40 to 50 s. Then add PVC, functional high polymer, plasticizer, foaming agent, filler, flame retardant, and antistatic auxiliary agent into the kneader and carry out mixing. The mixing temperature is set according to actual needs. For example, as an example, it can be set to 155 °C; then the discharged rubber compound is passed through a calender several times, such as 3 to 4 times, sheeted out, and air-cooled to obtain the masterbatch of the antistatic functional layer.

[0038] For the thermal insulation layer: First, put NBR into the internal mixer for pre-mixing for a period of time, and the length of time is set according to actual needs. For example, as an example, it can be set to 40 - 50 s. Then, add PVC, plasticizer, foaming agent, filler, and flame retardant into the internal mixer and carry out mixing. The mixing temperature is set according to actual needs. For example, as an example, it can be set to 155 °C. After that, the discharged rubber compound is passed through the two-roll mill several times, such as 3 - 4 times, sheeted out, and air-cooled to obtain the preliminary rubber compound of the thermal insulation layer.

[0039] 102. Preparation of the final rubber compound:

[0040] For the antistatic functional layer: Weigh the preliminary rubber compound of the antistatic functional layer, accelerator, and vulcanizing agent according to the ratio, put them into the internal mixer, discharge the rubber after mixing for a period of time, and the length of time is set according to actual needs. For example, as an example, it can be set to 50 - 60 s. The discharged rubber compound is passed through the two-roll mill several times, such as 1 - 2 times, sheeted out, and air-cooled to obtain the final rubber compound of the antistatic functional layer.

[0041] For the thermal insulation layer: Weigh the preliminary rubber compound of the thermal insulation layer, accelerator, and vulcanizing agent according to the ratio, put them into the internal mixer, discharge the rubber after mixing for a period of time, and the length of time is set according to actual needs. For example, as an example, it can be set to 50 - 60 s. The discharged rubber compound is passed through the two-roll mill several times, such as 1 - 2 times, sheeted out, and air-cooled to obtain the final rubber compound of the thermal insulation layer.

[0042] 103. Extrusion molding: Co-extrude the final rubber compounds of the thermal insulation layer and the antistatic functional layer to obtain a semi-finished sheet or pipe with the thermal insulation layer and the antistatic functional layer integrally formed.

[0043] 104. Vulcanization and foaming: Send the sheet or pipe into the vulcanization furnace, continuously pass through heating sections at different temperatures in the furnace, control the heating temperature at 125 - 170 °C, and carry out vulcanization and foaming.

[0044] 105. Cooling, cutting, and packaging: After coming out of the furnace, it is cooled in a water tank, air-dried, cut, and then packaged.

[0045] Among them, the antistatic auxiliary agent includes at least one of ionic antistatic agents and polymer permanent antistatic agents.

[0046] The functional high polymers include at least one of ACM, AEM, AU, EU, BR, BIIR, CIIR, ECO, EPM, EDPM, EVM, SBR, NBR, FKM, PM, IR, NR, PE, PP, PET, PBT, PC, PA, PU, PTFE, and PMMA. The above raw materials can be combined and matched according to actual functional requirements to endow corresponding functions, such as aging resistance, tear resistance, high temperature resistance, cold resistance, etc.

[0047] The plasticizer includes at least one of chlorinated paraffin, tricresyl phosphate, DOP, DINP, and paraffin oil.

[0048] The foaming agent includes at least one of organic foaming agents and inorganic foaming agents. For example, AC foaming agent can be used.

[0049] The filler includes at least one of carbon black, white carbon black, talc powder, clay, titanium dioxide, and calcium carbonate.

[0050] The flame retardant includes at least one of aluminum hydroxide, magnesium hydroxide, molybdenum oxide, ammonium octamolybdate, antimony trioxide, and zinc borate.

[0051] The accelerator includes at least one of DPTT, PZ, ZnO, and ZBS.

[0052] The vulcanizing agent includes S.

[0053] The present application will be described in detail below through a plurality of examples and comparative examples.

[0054] Table 1: Formulation ratios of each example and comparative example

[0055]

[0056]

[0057]

[0058] Test method: GB / T 31838.3-2019 Solid insulating materials - Dielectric and resistive properties - Part 3: Resistive properties (DC method) - Surface resistance and surface resistivity.

[0059] Test conditions:

[0060] Pretreatment conditions: (23 ± 2) °C, relative humidity (50 ± 5)%, 96 h.

[0061] Test conditions: (23 ± 2) °C, relative humidity (50 ± 5)%.

[0062] Electrode diameter: D1 = 50 mm, D2 = 70 mm.

[0063] Test voltage: 100 Vdc.

[0064] Electrification time: 1 min.

[0065] Table 2: Performance parameters of each example and comparative example

[0066] S1 S2 S3 D1 <![CDATA[Surface resistance R s > Ω <![CDATA[5.39×10 8 > <![CDATA[2.28×10 7 > <![CDATA[4.95×10 7 > ﹢∞ <![CDATA[Surface resistivity ρ s > Ω / sq <![CDATA[1.02×10 8 > <![CDATA[4.30×10 8 > <![CDATA[9.93×10 7 > ﹢∞

[0067] As can be seen from the test results in Table 2, the surface resistance and surface resistivity of S1 - S3 are much lower than those of D1, indicating that the antistatic effect of the thermal insulation material in the embodiment is very good.

[0068] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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. Therefore, it should not be construed as a limitation to the present application. Unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to" should be understood in a broad sense. For example, it 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0069] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non - exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0070] The above - mentioned are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. An antistatic double-layer composite rubber and plastic foamed thermal insulation material, characterized in that, It includes a thermal insulation layer and an antistatic functional layer provided on the thermal insulation layer; Calculated by mass parts, the antistatic functional layer includes: 3 - 15 parts of NBR, 0 - 12 parts of PVC, 1 - 22 parts of functional high polymer, 8 - 20 parts of plasticizer, 8 - 13 parts of foaming agent, 5 - 33 parts of filler, 8 - 40 parts of flame retardant, 0.05 - 1 part of accelerator, 0.01 - 2 parts of vulcanizing agent, and 1 - 5 parts of antistatic auxiliary agent; Calculated by mass parts, the thermal insulation layer includes: 12 - 15 parts of NBR, 8 - 12 parts of PVC, 8 - 20 parts of plasticizer, 8 - 13 parts of foaming agent, 5 - 33 parts of filler, 8 - 40 parts of flame retardant, 0.05 - 1 part of accelerator, and 0.01 - 2 parts of vulcanizing agent.

2. The antistatic double-layer composite rubber and plastic foamed thermal insulation material according to claim 1, characterized in that: The antistatic auxiliary agent includes at least one of ionic antistatic agent and polymer permanent antistatic agent.

3. The antistatic double-layer composite rubber and plastic foamed thermal insulation material according to claim 1, wherein: The functional high polymer includes at least one of ACM, AEM, AU, EU, BR, BIIR, CIIR, ECO, EPM, EDPM, EVM, SBR, NBR, FKM, PM, IR, NR, PE, PP, PET, PBT, PC, PA, PU, PTFE, PMMA.

4. The antistatic double-layer composite rubber and plastic foamed thermal insulation material according to claim 1, characterized in that: The plasticizer includes at least one of chlorinated paraffin, tricresyl phosphate, DOP, DINP, and paraffin oil.

5. The antistatic double-layer composite rubber and plastic foamed thermal insulation material according to claim 1, characterized in that: The foaming agent includes at least one of organic foaming agent and inorganic foaming agent.

6. The antistatic double-layer composite rubber and plastic foamed thermal insulation material according to claim 1, characterized in that: The filler includes at least one of carbon black, white carbon black, talcum powder, clay, titanium dioxide, and calcium carbonate.

7. The antistatic double-layer composite rubber and plastic foamed thermal insulation material according to claim 1, characterized in that: The flame retardant includes at least one of aluminum hydroxide, magnesium hydroxide, molybdenum oxide, ammonium octamolybdate, antimony trioxide, and zinc borate.

8. The antistatic double-layer composite rubber and plastic foamed thermal insulation material according to claim 1, wherein: The accelerator includes at least one of DPTT, PZ, ZnO, and ZBS.

9. The antistatic double-layer composite rubber and plastic foamed thermal insulation material according to claim 1, wherein: The vulcanizing agent includes S.

10. A preparation method of the antistatic double-layer composite rubber and plastic foamed thermal insulation material as described in claim 1, characterized in that, It includes the following steps:

101. Prepare the initial rubber: For the antistatic functional layer: First, put NBR into the internal mixer for pre - mixing for a period of time, then add PVC, functional high polymer, plasticizer, foaming agent, filler, flame retardant, and antistatic auxiliary agent into the internal mixer, and carry out mixing; then the discharged rubber compound is passed through the two - roll mill several times thinly, sheeted out, and air - cooled to obtain the initial rubber of the antistatic functional layer; For the thermal insulation layer: First, put NBR into the internal mixer for pre - mixing for a period of time, then add PVC, plasticizer, foaming agent, filler, flame retardant into the internal mixer, and carry out mixing; then the discharged rubber compound is passed through the two - roll mill several times thinly, sheeted out, and air - cooled to obtain the initial rubber of the thermal insulation layer; 102. Prepare the final rubber: For the antistatic functional layer: Weigh the initial rubber of the antistatic functional layer, accelerator, and vulcanizing agent, and put them into the internal mixer, mix for a period of time and then discharge the rubber. The discharged rubber compound is passed through the two - roll mill several times thinly, sheeted out, and air - cooled to obtain the final rubber of the antistatic functional layer; For the thermal insulation layer: Weigh the initial rubber of the thermal insulation layer, accelerator, and vulcanizing agent, and put them into the internal mixer, mix for a period of time and then discharge the rubber. The discharged rubber compound is passed through the two - roll mill several times thinly, sheeted out, and air - cooled to obtain the final rubber of the thermal insulation layer; 103. Extrusion molding: The final kneaded rubber of the thermal insulation layer and the antistatic functional layer is co-extruded to obtain a semi-finished sheet or pipe with the thermal insulation layer and the antistatic functional layer integrally formed; 104. Vulcanization and foaming: The sheet or pipe is sent into a vulcanization furnace for vulcanization and foaming; 105. Cooling, cutting, and packaging: After coming out of the furnace, it is cooled in a water tank, air-dried, cut, and then packaged.

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