WO2022135516A1 - Matériau d'étanchéité et son procédé de préparation, et bande d'étanchéité - Google Patents

Matériau d'étanchéité et son procédé de préparation, et bande d'étanchéité Download PDF

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WO2022135516A1
WO2022135516A1 PCT/CN2021/140786 CN2021140786W WO2022135516A1 WO 2022135516 A1 WO2022135516 A1 WO 2022135516A1 CN 2021140786 W CN2021140786 W CN 2021140786W WO 2022135516 A1 WO2022135516 A1 WO 2022135516A1
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sealing material
parts
sealing
expandable microspheres
material according
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PCT/CN2021/140786
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English (en)
Chinese (zh)
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贺热民
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广东美的白色家电技术创新中心有限公司
美的集团股份有限公司
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Publication of WO2022135516A1 publication Critical patent/WO2022135516A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/32—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof from compositions containing microballoons, e.g. syntactic foams
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0066—Use of inorganic compounding ingredients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
    • C08K13/04—Ingredients characterised by their shape and organic or inorganic ingredients
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
    • C08K3/016—Flame-proofing or flame-retarding additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/22—Expanded, porous or hollow particles
    • C08K7/24—Expanded, porous or hollow particles inorganic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/22—Expanded, porous or hollow particles
    • C08K7/24—Expanded, porous or hollow particles inorganic
    • C08K7/26—Silicon- containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • C—CHEMISTRY; METALLURGY
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    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/22—Expandable microspheres, e.g. Expancel®
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/08—Copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/04—Homopolymers or copolymers of ethene
    • C08J2423/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/04—Homopolymers or copolymers of ethene
    • C08J2423/08—Copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/10—Homopolymers or copolymers of propene
    • C08J2423/12—Polypropene

Definitions

  • the application belongs to the technical field of thermoplastic elastomer materials, and in particular relates to a sealing material, a preparation method thereof, and a sealing strip.
  • the sealing material should meet the requirements of sealing function. Due to the different media to be sealed and the working conditions of the equipment, the selection of sealing materials is also different. Taking the sealing strip of a refrigerator as an example, as an important component to maintain the internal temperature of the refrigerator, it has always been a research hotspot. At present, the materials of refrigerator sealing strips mainly include PVC (polyvinyl chloride), TPV (thermoplastic vulcanized rubber), TPS (thermoplastic elastomer styrene), TPU (thermoplastic polyurethane elastomer) and so on.
  • PVC polyvinyl chloride
  • TPV thermoplastic vulcanized rubber
  • TPS thermoplastic elastomer styrene
  • TPU thermoplastic polyurethane elastomer
  • PVC polyvinyl chloride
  • PVC sealing strips have the advantages of low price, stable chemical properties, easy processing, and high mechanical and mechanical properties, and is the most widely used in refrigerator door seals.
  • plasticizer in order to achieve soft and elastic properties of PVC sealing strips, a large amount of plasticizer needs to be added, which brings about the problem of large odor; and after three to five years of use, the product will age with the extension of time. In this case, the plasticizer in the material will migrate and precipitate slowly, causing the sealing strip to harden and the sealing performance to decrease. At this time, the energy consumption of the refrigerator will be greatly increased.
  • PVC materials contain halogens, which are prone to produce corrosive and carcinogenic gases during post-processing such as recycling or incineration, which has a great impact on the environment.
  • TPV thermoplastic vulcanizate
  • EPDM thermoplastic vulcanizate
  • TPV thermoplastic vulcanizate
  • It has the advantages of stable performance, adjustable hardness, chemical resistance, and good mechanical properties.
  • the production process of TPV is more complicated and requires high temperature kneading. Processes such as refining, extrusion granulation, extrusion vulcanization, etc., and the high price of EPDM raw materials, so the price of TPV is expensive, and the door seal produced by it is 4 to 5 times that of PVC door seal, which seriously limits its application.
  • a large amount of vulcanizing agent needs to be added when EPDM is vulcanized, which will also cause problems of high VOC and high odor.
  • TPS thermoplastic elastomer styrene, including SBS, SEBS, SIS, SEPS
  • SBS thermoplastic elastomer styrene
  • SEBS SEBS
  • SIS SIS
  • SEPS thermoplastic elastomer styrene
  • softeners such as white mineral oil or naphthenic oil are generally added to TPS materials to adjust the hardness of the product, and the addition of softener oil will cause problems of precipitation and odor, and reduce the aging resistance of the material, which will deteriorate after several years of use. There is a sticky surface problem, which seriously affects the service life of the product.
  • TPU thermoplastic polyurethane elastomer
  • the first object of the present application is to provide a sealing material, which has the advantages of low odor, good heat insulation, excellent aging resistance, convenient processing and low cost.
  • the sealing material provided in this application includes a main material and an auxiliary agent; the main material is composed of PP (polypropylene) and PE (polyethylene) with a mass ratio of (10-40): (10-30);
  • the auxiliary agent includes a hardness modifier, which is POE (polyolefin elastomer), EVA (ethylene-vinyl acetate copolymer), EAA (ethylene acrylic acid copolymer) or EMA (ethylene methyl acrylate) one or a combination of these.
  • sealing materials for different uses are significantly different.
  • a sealing material for refrigerators it should have the following characteristics: the material is soft and elastic, and the shore A hardness is suitable; the odor is as small as possible, reducing the impact on the food quality; good aging resistance, prolonging the service life of the seal.
  • plasticizers or softeners due to the addition of plasticizers or softeners, the existing mainstream refrigerator sealing materials are difficult to meet the above requirements at the same time.
  • the present application finds through in-depth research on elastomers that when PP and PE are mixed in a specific ratio with the above-mentioned hardness modifier, the hardness of the obtained material can meet the above-mentioned requirements of refrigerator sealing strips, thereby solving the existing mainstream sealing problems. Due to the addition of plasticizers or softeners, the material causes problems such as high odor, precipitation and hardening, premature aging of materials, and deterioration of sealing performance. It has been verified that the sealing material obtained in the present application is soft and elastic, with suitable hardness A, less material odor, good aging resistance, and longer service life of the material.
  • the mass ratio of the hardness modifier to the main material is (25-30):(30-55).
  • the hardness A (about 70°) of the obtained material can be effectively controlled while ensuring other basic properties of the sealing material.
  • the PP mentioned in this application is homopolymerized PP and/or copolymerized PP, and the melt index of PP ranges from 0.3 to 20 g/10min. Studies have shown that it is more beneficial to improve the processing stability by controlling the range of PP melt index, and avoid difficult processing due to too high melt index, or difficult extrusion due to too small melt index.
  • the PP is polypropylene SP179 and/or polypropylene BM09.
  • the PE mentioned in this application is LDPE (low density polyethylene) and/or LLDPE (linear low density polyethylene), and the melt index of PE ranges from 0.5 to 5 g/10min. Studies have shown that it is more beneficial to improve the processing stability by controlling the range of PE melt index, and avoid the situation that it is difficult to process due to too high melt index, or difficult to extrude due to too small melt index.
  • the PE is polyethylene 1002YB and/or polyethylene LD150.
  • the Shore A hardness of the hardness modifier described in this application is between 50 and 80°; the melt index of the hardness modifier is in the range of 0.5 to 5 g/10min. Studies have shown that by controlling the Shore hardness and melt index range of the hardness modifier, it is more helpful to improve the mixing degree of the material, thereby improving the comprehensive performance of the sealing material, especially the hardness index.
  • the hardness modifier is POE DF610, EVA630 or POE ENGAGE 8150.
  • the hardness modifier is POE (preferably its melt index is in the range of 0.5-5 g/10min); the mass ratio of the PP, PE and POE is (10-25) :(11-25):(25-30).
  • the hardness of the material is controlled between 70 ⁇ 3° at the shore A hardness while maintaining good mechanical properties.
  • the sealing material described in the present application also includes expandable microspheres to further reduce the thermal conductivity K value and density of the sealing material.
  • the particle size D50 of the expandable microspheres described in this application is between 10 and 50 ⁇ m.
  • the mass ratio of the expandable microspheres to the main material is (10-30):(30-55).
  • expandable microspheres have the advantages of low density and good thermal insulation performance. Adding them to the above elastomer system helps to reduce the thermal conductivity K value and density of the sealing material. Although increasing the addition amount of microspheres significantly reduces the thermal insulation performance of the material, it also seriously affects the tensile strength of the material.
  • the present application controls the particle size range and the addition ratio of the expandable microspheres, and through dual control means, the sealing material after adding the expandable microspheres not only maintains the original tensile strength, but also can significantly reduce the density and thermal conductivity. coefficient.
  • the mass ratio of the expandable microspheres to the main material is (15-30): (30-55); under this condition, the obtained sealing material has a high processing yield and a thermal conductivity K value significantly reduced.
  • the sealing material includes the following components in parts by weight: 10-40 parts of PP; 10-30 parts of PE; 25-45 parts of hardness modifier, 10-30 parts of expandable microspheres 1-20 parts of inorganic mineral filler; 0.5-5 parts of compatibilizer; 0.2-2.5 parts of adsorbent; 0.5-2 parts of dispersing lubricant; 0.1-1 part of heat stabilizer; 0.1-2 parts of colorant.
  • the sealing material comprises the following components by weight: 10-25 parts of PP; 10-30 parts of PE; 25-30 parts of POE; 10-30 parts of expandable microspheres; 2-13 parts of inorganic mineral fillers; 3-4 parts of compatibilizer; 0.5-2 part of adsorbent; 0.5-1 part of dispersing lubricant; 0.5 part of heat stabilizer; 0.5-1 part of colorant.
  • the inorganic mineral filler is one or a mixture of calcium carbonate, talc, wollastonite, fly ash or barium sulfate, and the particle size of the inorganic mineral filler is between 325 and 3000 meshes.
  • the compatibilizer is one or a mixture of PP grafted maleic anhydride, PE grafted maleic anhydride, POE grafted maleic anhydride or PP grafted glycidyl ester.
  • the dispersing lubricant is a compound of one or more of aluminate, titanate or K550/K560 coupling agent and one or more of PE wax, TAF or EBS.
  • the adsorbent is a porous adsorbent material, such as one or a mixture of materials such as zeolite, vermiculite, molecular sieve, diatomaceous earth or alumina.
  • the heat stabilizer is a complex of one or more of antioxidants 1010, 1076, 168, 626 or 627 and one or more of light stabilizers 770, 944, 622, 3853 or 119 ingredients.
  • the colorant is rutile titanium dioxide.
  • the sealing material includes the following components by weight: 10-25 parts of PP; 10-25 parts of PE; 25-30 parts of POE; 10-30 parts of expandable microspheres; inorganic mineral filler 2-13 parts; 3-4 parts of compatibilizer; 0.5-2 part of adsorbent; 0.5-1 part of dispersing lubricant; 0.5 part of heat stabilizer; 0.5-1 part of colorant.
  • the sealing material described in the present application is made only from the above-mentioned components (no further additives are included).
  • the second object of the present application is to provide a method for preparing the above-mentioned sealing material.
  • the preparation method of the sealing material described in this application includes:
  • premix A Mix the main material and other additives except expandable microspheres and adsorbents to obtain premix A;
  • the sealing material is prepared by mixing the premix A and the premix B with a twin-screw extruder.
  • the sealing material obtained by the method of the present application has the advantages of low odor, low sealing, good thermal insulation, excellent aging resistance, convenient processing and low cost.
  • the premix B is fed through a side feeding port to avoid the breakage of the expandable microbeads during processing.
  • the temperature of the barrel of the twin-screw extruder is between 70 and 190° C., and the rotational speed of the screw is between 250 and 350 r/min. Studies have shown that by optimizing the feeding method of the expandable microspheres, and optimizing the barrel temperature and screw speed, the breakage of the expandable microspheres during processing can be effectively avoided, and the thermal insulation effect of the sealing strip can be effectively improved at the same time. Reduce the density and greatly reduce the energy consumption of the refrigerator.
  • the barrel temperature of the twin-screw extruder is set to: 70°C in the first zone, 180°C in the second zone, 180°C in the third zone, 170°C in the fourth zone, and 180°C in the second zone.
  • the fifth zone is 160°C
  • the sixth zone is 150°C
  • the seventh zone is 130°C
  • the eighth zone is 130°C
  • the ninth zone is 120°C
  • the screw speed is 300r/min.
  • the third object of the present application is to provide a sealing strip made of the above-mentioned sealing material.
  • the sealing strip provided by the present application can effectively improve the thermal insulation effect of the existing sealing strip, at the same time significantly reduce the odor of the sealing strip, improve its aging resistance, greatly reduce the energy consumption of refrigeration equipment, and have a service life of more than 10 years. Good promotion value and application prospects.
  • the fourth object of the present application is to provide a refrigeration device using the above-mentioned sealing strip.
  • the refrigeration equipment described in this application includes a variety of known products with refrigeration functions, preferably refrigerators and freezers.
  • the refrigeration equipment using the sealing strip of the present application has the advantages of better thermal performance and lower energy consumption.
  • a hardness modifier is used as the main auxiliary agent for hardness adjustment, which avoids the problem of aging and hardening caused by the migration and precipitation of liquid plasticizers caused by adding liquid materials such as plasticizers or softeners, thereby affecting the sealing ability.
  • the sealing strip made of the sealing material obtained in the present application can reach the designed service life of the refrigerator for more than 10 years.
  • Expandable microsphere material is added to the sealing material of this application, and the screw structure and processing technology are optimized to effectively prevent the microspheres from breaking during processing, thereby reducing the thermal conductivity of the material and effectively improving the thermal insulation effect of the sealing strip. Reduce the density and greatly reduce the energy consumption of the refrigerator.
  • the adsorbent added in this application can further reduce the production of organic volatile small molecules, thereby reducing the odor of the sealing material, and making the VOC level of the sealing strip product reach 0-1 level.
  • the sealing material obtained in the present application is halogen-free, environmentally friendly, safe, simple in processing technology, and comprehensive in cost-effectiveness.
  • the raw materials used in the following examples are all known commercially available materials, such as POE DF610 can be purchased from Japan's Mitsui Chemicals; expandable microspheres 051DU40 can be purchased from AkzoNobel.
  • This embodiment provides a sealing material, and the sealing material includes the following components:
  • This embodiment also provides a preparation method of the above-mentioned sealing material, and the specific steps are as follows:
  • the first step is to weigh polypropylene, polyethylene, POE, inorganic mineral fillers, compatibilizers, dispersing lubricants, heat stabilizers, and colorants according to the above-mentioned parts by weight, and put them into a high-speed mixer for high-speed stirring for 10 minutes until the materials are uniform. Discharge at low speed to get premix A;
  • the expandable microspheres and the adsorbent are weighed according to the above-mentioned parts by weight, put into a high-speed mixer for medium-low speed stirring for 10 minutes until the material is uniform, and the premix B is discharged;
  • the premix A described in step 1 is placed in the main feeding hopper of the twin-screw extruder for extrusion, and the premix B is fed through the side feeding port, and the main feeding screw and the side feeding port are adjusted.
  • the speed ratio of the screw to the feeding extruder is 1:1, and after extrusion, the required sealing strip material is obtained by cooling with water and cutting into pellets.
  • the barrel temperature of the twin-screw extruder is set at 70°C in the first zone, 180°C in the second zone, 180°C in the third zone, 170°C in the fourth zone, 160°C in the fifth zone, 150°C in the sixth zone, and 150°C in the sixth zone.
  • the seventh zone is 130°C
  • the eighth zone is 130°C
  • the ninth zone is 120°C
  • the die temperature is 110°C
  • the screw speed is 300r/min.
  • This embodiment provides a sealing material, and the sealing material includes the following components:
  • This embodiment also provides a preparation method of the above-mentioned sealing material, and the specific steps are as follows:
  • the first step is to weigh polypropylene, polyethylene, POE, inorganic mineral fillers, compatibilizers, dispersing lubricants, heat stabilizers, and colorants according to the above-mentioned parts by weight, put them into a high-speed mixer, and stir at a high speed for 10 minutes until the materials are uniform. Discharge at low speed to get premix A;
  • the expandable microspheres and the adsorbent are weighed according to the above-mentioned parts by weight, put into a high-speed mixer for medium-low speed stirring for 10 minutes until the material is uniform, and the premix B is discharged;
  • the premix A described in step 1 is placed in the main feeding hopper of the twin-screw extruder for extrusion, and the premix B is fed through the side feeding port, and the main feeding screw and the side feeding port are adjusted.
  • the speed ratio of the screw to the feeding extruder is 1:0.95, and after extrusion, the desired sealing material is obtained by cooling with water and cutting into pellets.
  • the barrel temperature of the twin-screw extruder is set at 70°C in the first zone, 170°C in the second zone, 170°C in the third zone, 160°C in the fourth zone, 150°C in the fifth zone, 140°C in the sixth zone, and 140°C in the sixth zone.
  • the seventh zone is 110°C
  • the eighth zone is 110°C
  • the ninth zone is 120°C
  • the die temperature is 110°C
  • the screw speed is 300r/min.
  • This embodiment provides a sealing material, and the sealing material includes the following components:
  • This embodiment also provides a preparation method of the above-mentioned sealing material, and the specific steps are as follows:
  • the first step is to weigh polypropylene, polyethylene, POE, inorganic mineral fillers, compatibilizers, dispersing lubricants, heat stabilizers, and colorants according to the above-mentioned parts by weight, and put them into a high-speed mixer for high-speed stirring for 10 minutes until the materials are uniform. Discharge at low speed to get premix A;
  • the expandable microspheres and the adsorbent are weighed according to the above-mentioned parts by weight, put into a high-speed mixer for medium-low speed stirring for 10 minutes until the material is uniform, and the premix B is discharged;
  • the premix A described in step 1 is placed in the main feeding hopper of the twin-screw extruder for extrusion, and the premix B is fed through the side feeding port, and the main feeding screw and the side feeding port are adjusted.
  • the speed ratio of the screw to the feeding extruder is 1:1.05, and after extrusion, the required sealing strip material is obtained by cooling with water and cutting into pellets.
  • the barrel temperature of the twin-screw extruder is set at 70°C in the first zone, 170°C in the second zone, 170°C in the third zone, 160°C in the fourth zone, 150°C in the fifth zone, 140°C in the sixth zone, and 140°C in the sixth zone.
  • the seventh zone is 130°C
  • the eighth zone is 130°C
  • the ninth zone is 120°C
  • the die temperature is 110°C
  • the screw speed is 280r/min.
  • This embodiment provides a sealing material, and the sealing material includes the following components:
  • This embodiment also provides a preparation method of the above-mentioned sealing material, and the specific steps are as follows:
  • the first step is to weigh polypropylene, polyethylene, POE, inorganic mineral fillers, compatibilizers, dispersing lubricants, heat stabilizers, and colorants according to the above-mentioned parts by weight, and put them into a high-speed mixer for high-speed stirring for 10 minutes until the materials are uniform. Discharge at low speed to get premix A;
  • the expandable microspheres and the adsorbent are weighed according to the above-mentioned parts by weight, put into a high-speed mixer for medium-low speed stirring for 10 minutes until the material is uniform, and the premix B is discharged;
  • the premix A described in step 1 is placed in the main feeding hopper of the twin-screw extruder for extrusion, and the premix B is fed through the side feeding port, and the main feeding screw and the side feeding port are adjusted.
  • the speed ratio of the screw to the feeding extruder is 1:1.05, and after extrusion, the required sealing strip material is obtained by cooling with water and cutting into pellets.
  • the barrel temperature of the twin-screw extruder is set at 70°C in the first zone, 170°C in the second zone, 170°C in the third zone, 160°C in the fourth zone, 150°C in the fifth zone, 140°C in the sixth zone, and 140°C in the sixth zone.
  • the seventh zone is 130°C
  • the eighth zone is 130°C
  • the ninth zone is 120°C
  • the die temperature is 110°C
  • the screw speed is 280r/min.
  • This embodiment provides a sealing material, and the sealing material includes the following components:
  • This embodiment also provides a preparation method of the above-mentioned sealing material, and the specific steps are as follows:
  • the first step is to weigh polypropylene, polyethylene, EVA, inorganic mineral fillers, compatibilizers, dispersing lubricants, heat stabilizers, and colorants according to the above-mentioned parts by weight, and put them into a high-speed mixer for high-speed stirring for 10 minutes until the material is uniform. Discharge at low speed to get premix A;
  • the expandable microspheres and the adsorbent are weighed according to the above-mentioned parts by weight, put into a high-speed mixer for medium-low speed stirring for 10 minutes until the material is uniform, and the premix B is discharged;
  • the premix A described in step 1 is placed in the main feeding hopper of the twin-screw extruder for extrusion, and the premix B is fed through the side feeding port, and the main feeding screw and the side feeding port are adjusted.
  • the speed ratio of the screw to the feeding extruder is 1:1.03, and after extrusion, the required sealing strip material is obtained by cooling with water and cutting into pellets.
  • the barrel temperature of the twin-screw extruder is set to 70°C in the first zone, 160°C in the second zone, 160°C in the third zone, 160°C in the fourth zone, 150°C in the fifth zone, 150°C in the sixth zone, and 150°C in the sixth zone.
  • the seventh zone is 140°C
  • the eighth zone is 130°C
  • the ninth zone is 120°C
  • the die temperature is 120°C
  • the screw speed is 280r/min.
  • the sealing materials prepared in the examples were placed in a blast drying oven and dried at 90° C. for 2 hours to remove the moisture on the surface of the particles, placed in a small vulcanizer and heated at 210° C. After molding and foaming, the test specimens were pressed according to the test standard. And 120mm*120mm*3mm size cutting thermal conductivity test piece,
  • the performance was tested after a constant temperature of 25°C for 24 hours.
  • Comparative Example 1 PVC sealing strip, the size is the same as the above standard spline.
  • Comparative Example 2 TPV sealing strip, the size is the same as the above standard spline.
  • Tensile strength refer to ISO527, the tensile speed is 50mm/min;
  • VOC level refer to the enterprise standard QMB-J032 2020a;
  • the sealing material product of the present application also has good mechanical properties and environmental protection, and can be applied to refrigerator sealing strips.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Sealing Material Composition (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

La présente demande concerne le domaine technique des matériaux élastomères thermoplastiques, et en particulier, un matériau d'étanchéité et son procédé de préparation, et une bande d'étanchéité. Le matériau d'étanchéité fourni par la présente invention comprend un matériau principal et un agent auxiliaire. Le matériau principal est constitué de PP et PE sous un rapport en masse de (10 à 40):(10 à 30). L'agent auxiliaire comprend un agent de modification de dureté, et l'agent de modification de dureté est l'un parmi POE, EVA, EAA, ou EMA, ou une combinaison de ces derniers. Le matériau d'étanchéité selon la présente demande présente les avantages d'une faible odeur, d'une bonne isolation thermique, d'une excellente résistance au vieillissement, d'un traitement pratique, d'un faible coût et similaires, et convient à la préparation de bandes d'étanchéité des dispositifs de réfrigération tels que les réfrigérateurs et les congélateurs. L'odeur de la bande d'étanchéité peut être remarquablement réduite tout en améliorant efficacement l'effet d'isolation thermique de la bande d'étanchéité existante, la résistance au vieillissement de la bande d'étanchéité est améliorée, la consommation d'énergie du dispositif de réfrigération est grandement réduite, la durée de vie peut atteindre plus de 10 ans, et la bande d'étanchéité présente de bonnes valeur de popularisation et perspective d'application.
PCT/CN2021/140786 2020-12-25 2021-12-23 Matériau d'étanchéité et son procédé de préparation, et bande d'étanchéité WO2022135516A1 (fr)

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