CN112409724A - Antibacterial PVC door seal for refrigerator and preparation method thereof - Google Patents
Antibacterial PVC door seal for refrigerator and preparation method thereof Download PDFInfo
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- CN112409724A CN112409724A CN202011305916.XA CN202011305916A CN112409724A CN 112409724 A CN112409724 A CN 112409724A CN 202011305916 A CN202011305916 A CN 202011305916A CN 112409724 A CN112409724 A CN 112409724A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Refrigerator Housings (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention discloses an antibacterial PVC door seal for a refrigerator, and relates to the technical field of door seals. The invention comprises the following steps of: 40 to 50 percent of PVC resin powder; 30 to 40 percent of combined plasticizer; 15 to 25 percent of inorganic filler; 2-10% of antibacterial agent, and the antibacterial agent is nano zinc oxide or zinc oxide whisker; 1.5 to 5 percent of heat stabilizer; 1% -3% of a lubricant; 0.2 to 2 percent of oxidant. According to the invention, the nano zinc oxide or the zinc oxide whisker is added in the door seal formula to serve as an antibacterial agent, and the door seal with an antibacterial effect is obtained through proportion adjustment, so that the problems of poor long-term stability, heat resistance and antibacterial effect of the existing door seal are solved.
Description
Technical Field
The invention belongs to the technical field of door seals, and particularly relates to an antibacterial PVC door seal for a refrigerator and a preparation method thereof.
Background
Along with the continuous improvement of people's standard of living, the refrigerator has become the indispensable household electrical appliances of daily family, and current refrigerator is sealed to be realized with door and box actuation through the door strip of paper used for sealing, but the refrigerator can produce a large amount of bacterias and mould in the use, and these microorganisms can exist on the door strip of paper used for sealing, not only influence the outward appearance of refrigerator, still influence the sanitary performance of refrigerator, so also be indispensable to the sanitary antibacterial function of door strip of paper used for sealing.
At present, most of door sealing strips for refrigerators are made of soft PVC materials, and for PVC sealing strips, the main components of the door sealing strips are PVC powder resin, a plasticizer, a filler, a plurality of photo-thermal stabilizers and the like. In order to improve the antibacterial and mildew-proof performance of the door seal, a certain proportion of antibacterial agent is added into PVC granules to achieve the antibacterial effect in the prior art.
The common antibacterial agents of the prior door seal are inorganic antibacterial agents, organic antibacterial agents and natural antibacterial agents. The inorganic antibacterial agent is mainly the antibacterial agent type represented by metals such as silver, copper and the like, in particular to a silver ion antibacterial agent which has a dominant role in inorganic antibacterial; the organic antibacterial agent is mainly micromolecular organic matter such as imidazoles, thiazoles, quaternary ammonium salts and the like; the natural antibacterial agent is mainly extracted from natural plants, such as chitin, mustard, castor oil, horseradish, etc. However, these types of antibacterial agents have their own disadvantages in PVC plastic applications, such as incompatibility between silver ion antibacterial agents and plastic particles, environmental protection limit requirements, and the like, easy precipitation of small organic molecule antibacterial agents, poor long-term stability, poor heat resistance of natural antibacterial agents, low sterilization efficiency, and the like. Based on the situation, the development of the antibacterial door seal with long-acting antibacterial effect has great manufacturing influence and important significance on health and safety.
Disclosure of Invention
The invention aims to provide an antibacterial PVC door seal for a refrigerator, which is prepared by adding nano zinc oxide or zinc oxide whiskers into a door seal formula to serve as an antibacterial agent and adjusting the proportion to obtain the door seal with an antibacterial effect, and solves the problems of poor long-term stability, heat resistance and antibacterial effect of the conventional door seal.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to an antibacterial PVC door seal for a refrigerator, which comprises the following components in percentage by mass:
further, the combined plasticizer comprises 30-70% of polyester plasticizer, 30-60% of tributyl citrate and 5-10% of ESO.
Further, the inorganic filler is calcium carbonate.
Further, the heat stabilizer is a Ca-Zn composite stabilizer.
Further, the lubricant is one or two of stearic acid and paraffin wax.
Further, the oxidant is antioxidant 1010.
Further, the antibacterial PVC door seal for the refrigerator comprises pigment; the pigment is titanium dioxide pigment.
A preparation method of an antibacterial PVC door seal for a refrigerator comprises the following steps:
the method comprises the following steps: mixing the antibacterial agent, the oxidant and the heat stabilizer according to the formula amount, and uniformly stirring to obtain an auxiliary agent mixture;
step two: putting the PVC resin powder with the formula amount into a mixer, stirring for 1-5 minutes, adding the auxiliary mixture obtained in the step one, stirring for 5-10 minutes, and adding the combined plasticizer with the formula amount with stirring;
step three: adjusting and controlling the temperature of the mixed material to be 100-110 ℃, and preserving the heat for 15-20 minutes;
step four: adding inorganic filler and lubricant while stirring, continuously stirring for 8-15 minutes, and discharging to obtain a PVC powdery mixture;
step five: granulating the PVC powdery mixture to obtain PVC granules; and adding the PVC granules into door seal extrusion equipment, and carrying out extrusion treatment at the temperature of 135-155 ℃ to obtain the antibacterial PVC door seal.
Further, the combined plasticizer in the second step is added from small to large according to the molecular weight of the composition, and is added by spraying.
Further, pigments with different colors can be added in the first step to obtain door seals with different colors.
The invention has the following beneficial effects:
according to the door seal strip with the antibacterial effect, the nano zinc oxide or the zinc oxide whisker is added into the door seal strip formula to serve as the antibacterial agent, and the door seal strip with the antibacterial effect is prepared through proportion adjustment, so that the door seal strip obtains the long-term antibacterial effect, higher heat resistance, cold resistance and migration resistance, the overall performance of the door seal strip is effectively improved, and the service life of the door seal strip is effectively prolonged.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention discloses an antibacterial PVC door seal for a refrigerator, which comprises the following components in part by weight: 97.5g of PVC resin powder (aerospace YH-1300), 61.5g of combined plasticizer (5g of ESO, 30g of polyester plasticizer PN7030 and 25g of tributyl citrate), 5g of Ca-Zn composite stabilizer, 31g of calcium carbonate (LD-800), 5g of nano zinc oxide, 3g of lubricant (stearic acid) and 1g of antioxidant 1010, and titanium pigment.
A preparation method of an antibacterial PVC door seal for a refrigerator comprises the following steps:
the method comprises the following steps: the antibacterial agent, the pigment, the oxidant and the heat stabilizer in the formula amount are mixed and stirred uniformly to obtain the assistant mixture.
Step two: putting the PVC resin powder with the formula amount into a mixer, stirring for 1 minute, adding the auxiliary mixture obtained in the step one, stirring for 5 minutes, and adding the combined plasticizer with the formula amount with stirring; the combined plasticizer is sprayed and added gradually from small to large according to the molecular weight of ESO, the polyester plasticizer and tributyl citrate.
Step three: and after the second step is finished, adjusting and controlling the temperature of the mixed material to be 100-110 ℃, and preserving the heat for 15-20 minutes.
Step four: and adding an inorganic filler and a lubricant during stirring, continuously stirring for 8-15 minutes, and discharging to obtain a PVC powdery mixture.
Step five: granulating the PVC powdery mixture to obtain PVC granules; and adding the PVC granules into door seal extrusion equipment, and carrying out extrusion treatment at the temperature of 135-155 ℃ to obtain the antibacterial PVC door seal.
Example 2
The invention discloses an antibacterial PVC door seal for a refrigerator, which comprises the following components in part by weight: 100g of PVC resin powder (Taiwan plastic S-70), 68g of combined plasticizer (6g of ESO, 32g of polyester plasticizer PN7030 and 30g of tributyl citrate), 5g of Ca-Zn composite stabilizer, 33g of calcium carbonate (LD-800), 6g of zinc oxide whisker, 5g of lubricant (stearic acid and paraffin combination) and 1g of antioxidant 1010, and titanium dioxide pigment.
The preparation method comprises the following steps: the same as in example 1.
Example 3
The invention discloses an antibacterial PVC door seal for a refrigerator, which comprises the following components in part by weight: 100g of PVC resin powder (aerospace YH-1300), 70g of combined plasticizer (8g of ESO, 32g of polyester plasticizer PN7030 and 30g of tributyl citrate), 5g of Ca-Zn composite stabilizer, 35g of calcium carbonate (LD-800), 7g of zinc oxide whisker, 4g of lubricant (combination of stearic acid and paraffin wax) and 1.5g of antioxidant 1010, and titanium pigment.
The preparation method comprises the following steps: the same as in example 1.
Comparative example
The raw material formula of the gate seam strip comprises: 100g of PVC resin powder (Taiwan plastic S-70), 60g of combined plasticizer (5g of ESO, 30g of DOTP and 25g of TOTM), 5g of Ca-Zn composite stabilizer, 30g of calcium carbonate (LD-800), 3g of lubricant (stearic acid) and 1g of antioxidant 1010, and a plurality of titanium pigment, wherein the adding amount of each raw material is enlarged according to the output during specific production.
The preparation method comprises the following steps: firstly, auxiliaries such as an antioxidant and the like are mixed with the Ca-Zn composite stabilizer and stirred to obtain an auxiliary mixture. And then putting the PVC resin powder into a mixer, firstly stirring at a low speed for 1 minute, then adding the auxiliary mixture, stirring for 5 minutes, then slowly adding the combined plasticizer along with the stirring, gradually spraying and adding the plasticizer from small to large according to the molecular weight of the composition, turning to a high speed after the addition is finished, controlling the temperature of the material at 100-110 ℃ by adjusting the high speed and the low speed, and preserving the heat for 15 minutes.
And then, adjusting to low speed, adding calcium carbonate powder and a lubricant, continuously stirring for 10 minutes, discharging at low speed to obtain a PVC powdery mixture, plasticizing and extruding the PVC powdery mixture by using a double screw to obtain PVC granules, then extruding the PVC granules on a door seal production line at the temperature of 135-155 ℃, and then sequentially carrying out traction, cooling, cutting, magnetic stripe loading, welding and the like to obtain the door seal for the refrigerator.
The evaluation method comprises the following steps:
1. the sealing tapes obtained in examples 1 to 3 and comparative example were evaluated for heat resistance, cold resistance, migration resistance and antibacterial property, respectively.
2. Evaluation index and test method:
testing of Heat resistance: preparing a test piece by an open mill and a vulcanizing machine, taking the test piece with the thickness of 150mm, marking a line with the thickness of 100mm on the middle test piece, placing the test piece into a high-temperature groove with the temperature of 70 ℃, taking out after 6 hours, testing the size of the marked line by using a vernier caliper within 1 minute, and calculating the size reduction rate.
Testing of cold resistance: preparing a test piece with the thickness of 150mm by an open mill and a vulcanizing machine, marking a line with the thickness of 100mm on the middle test piece, placing the test piece into a constant-temperature constant-humidity tank with the temperature of-20 ℃, taking out after 6 hours, testing the size of the marked line by using a vernier caliper within 1 minute, and calculating the size reduction rate.
Testing of migration resistance: uniformly cutting 5 sections of samples with the length of 100mm from a door seal, cutting off a chamfer part, clamping two HIPS plates (or ABS plates or spraying plates or PCM plates), wherein the size of the plate is slightly larger than that of the sample, applying 2kg of force on the plate, placing the plate in an oven at 40 +/-2 ℃, taking out the plate after 24 hours, placing the plate in the oven at room temperature, and opening the plate after the plate is placed at room temperature.
Testing environmental protection performance: the antibacterial and mildewproof test experiment refers to GB21551.2-2010 test standard. The test results are shown in table 1. comparison of properties.
TABLE 1 comparison of Properties
And (4) conclusion: the results of the embodiments 1-3 show that the PVC sealing strip prepared by the formula has good antibacterial and mildewproof properties, the antibacterial rate reaches over 99%, and the mildewproof grade reaches 0 level.
Meanwhile, it is shown from the data in Table 1 that the sealing tapes of the raw material formulations of examples 1 to 3 have higher heat resistance, cold resistance and migration resistance than those of the comparative formulations.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. The utility model provides an antibiotic PVC door strip of paper used for sealing for refrigerator which characterized in that: the method comprises the following steps of:
2. the antimicrobial PVC door seal for refrigerators according to claim 1, wherein the combined plasticizer comprises 30% to 70% of polyester plasticizer, 30% to 60% of tributyl citrate and 5% to 10% of ESO.
3. The antibacterial PVC door seal for refrigerators according to claim 1, wherein the inorganic filler is calcium carbonate.
4. The refrigerator antibacterial PVC door gasket according to claim 1, wherein the heat stabilizer is Ca-Zn composite stabilizer.
5. The antibacterial PVC door seal for refrigerators according to claim 1, wherein the lubricant is one or both of stearic acid and paraffin wax.
6. The antimicrobial PVC door seal for refrigerators according to claim 1, wherein the oxidant is antioxidant 1010.
7. The refrigerator antibacterial PVC door seal according to claim 1, 2, 3, 4, 5 or 6, comprising pigment; the pigment is titanium dioxide pigment.
8. A preparation method of an antibacterial PVC door seal for a refrigerator is characterized by comprising the following steps:
the method comprises the following steps: mixing the antibacterial agent, the oxidant and the heat stabilizer according to the formula amount, and uniformly stirring to obtain an auxiliary agent mixture;
step two: putting the PVC resin powder with the formula amount into a mixer, stirring for 1-5 minutes, adding the auxiliary mixture obtained in the step one, stirring for 5-10 minutes, and adding the combined plasticizer with the formula amount with stirring;
step three: adjusting and controlling the temperature of the mixed material to be 100-110 ℃, and preserving the heat for 15-20 minutes;
step four: adding inorganic filler and lubricant while stirring, continuously stirring for 8-15 minutes, and discharging to obtain a PVC powdery mixture;
step five: granulating the PVC powdery mixture to obtain PVC granules; and adding the PVC granules into door seal extrusion equipment, and carrying out extrusion treatment at the temperature of 135-155 ℃ to obtain the antibacterial PVC door seal.
9. The method of claim 8, wherein the combined plasticizer is added in the second step in order of molecular weight of the composition from small to large, and is added by spraying.
10. The method for preparing an antibacterial PVC door seal for a refrigerator according to claim 8, wherein in the first step, pigments of different colors can be added to obtain door seals of different colors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011305916.XA CN112409724A (en) | 2020-11-19 | 2020-11-19 | Antibacterial PVC door seal for refrigerator and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011305916.XA CN112409724A (en) | 2020-11-19 | 2020-11-19 | Antibacterial PVC door seal for refrigerator and preparation method thereof |
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| CN112409724A true CN112409724A (en) | 2021-02-26 |
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| CN202011305916.XA Pending CN112409724A (en) | 2020-11-19 | 2020-11-19 | Antibacterial PVC door seal for refrigerator and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003033596A1 (en) * | 2001-10-17 | 2003-04-24 | Kabushiki Kaisha Sangi | Anti-bacterial composite particles and anti-bacterial resin composition |
| CN103980651A (en) * | 2014-05-23 | 2014-08-13 | 合肥华凌股份有限公司 | High-elasticity thermoplastic elastomer door seal for refrigeration device and production method and refrigeration device |
| CN111393765A (en) * | 2020-04-23 | 2020-07-10 | 长虹美菱股份有限公司 | Antibacterial PVC door seal for refrigerator and preparation method thereof |
-
2020
- 2020-11-19 CN CN202011305916.XA patent/CN112409724A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003033596A1 (en) * | 2001-10-17 | 2003-04-24 | Kabushiki Kaisha Sangi | Anti-bacterial composite particles and anti-bacterial resin composition |
| CN103980651A (en) * | 2014-05-23 | 2014-08-13 | 合肥华凌股份有限公司 | High-elasticity thermoplastic elastomer door seal for refrigeration device and production method and refrigeration device |
| CN111393765A (en) * | 2020-04-23 | 2020-07-10 | 长虹美菱股份有限公司 | Antibacterial PVC door seal for refrigerator and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 吴宏富等主编: "《中国粉体工业通鉴 第2卷 2006版》", 30 June 2006, 中国建材工业出版社 * |
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