CN113773552A - Dihydropyridine PVC composite heat stabilizer and preparation method thereof - Google Patents
Dihydropyridine PVC composite heat stabilizer and preparation method thereof Download PDFInfo
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- CN113773552A CN113773552A CN202111139735.9A CN202111139735A CN113773552A CN 113773552 A CN113773552 A CN 113773552A CN 202111139735 A CN202111139735 A CN 202111139735A CN 113773552 A CN113773552 A CN 113773552A
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- dihydropyridine
- heat stabilizer
- composite heat
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- molecular sieve
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- YNGDWRXWKFWCJY-UHFFFAOYSA-N 1,4-Dihydropyridine Chemical compound C1C=CNC=C1 YNGDWRXWKFWCJY-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 239000012760 heat stabilizer Substances 0.000 title claims abstract description 28
- 239000002131 composite material Substances 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical class [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000004014 plasticizer Substances 0.000 claims abstract description 10
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 8
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 7
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims abstract description 7
- 239000008116 calcium stearate Substances 0.000 claims abstract description 7
- 235000013539 calcium stearate Nutrition 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 6
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims abstract description 6
- 239000002808 molecular sieve Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- VLTRZXGMWDSKGL-UHFFFAOYSA-M perchlorate Inorganic materials [O-]Cl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-M 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Chemical group CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical group CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 claims description 2
- JQCXWCOOWVGKMT-UHFFFAOYSA-N phthalic acid diheptyl ester Natural products CCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCC JQCXWCOOWVGKMT-UHFFFAOYSA-N 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims 1
- 239000003381 stabilizer Substances 0.000 abstract description 20
- IHBCFWWEZXPPLG-UHFFFAOYSA-N [Ca].[Zn] Chemical compound [Ca].[Zn] IHBCFWWEZXPPLG-UHFFFAOYSA-N 0.000 abstract description 10
- -1 sodium perchlorate modified molecular sieve Chemical class 0.000 abstract description 8
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 abstract description 4
- 229910001488 sodium perchlorate Inorganic materials 0.000 abstract description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 abstract description 2
- 239000011575 calcium Substances 0.000 abstract description 2
- 229910052791 calcium Inorganic materials 0.000 abstract description 2
- 238000013329 compounding Methods 0.000 abstract description 2
- 230000001050 lubricating effect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 abstract description 2
- 238000001556 precipitation Methods 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 238000003786 synthesis reaction Methods 0.000 abstract description 2
- 239000011701 zinc Substances 0.000 abstract description 2
- 229910052725 zinc Inorganic materials 0.000 abstract description 2
- 239000006084 composite stabilizer Substances 0.000 abstract 1
- 239000004800 polyvinyl chloride Substances 0.000 description 32
- 229920000915 polyvinyl chloride Polymers 0.000 description 32
- 230000000052 comparative effect Effects 0.000 description 10
- 238000012360 testing method Methods 0.000 description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- 238000012545 processing Methods 0.000 description 8
- 238000009472 formulation Methods 0.000 description 6
- 239000006057 Non-nutritive feed additive Substances 0.000 description 4
- IQFVPQOLBLOTPF-HKXUKFGYSA-L congo red Chemical compound [Na+].[Na+].C1=CC=CC2=C(N)C(/N=N/C3=CC=C(C=C3)C3=CC=C(C=C3)/N=N/C3=C(C4=CC=CC=C4C(=C3)S([O-])(=O)=O)N)=CC(S([O-])(=O)=O)=C21 IQFVPQOLBLOTPF-HKXUKFGYSA-L 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 125000004925 dihydropyridyl group Chemical group N1(CC=CC=C1)* 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- USFZMSVCRYTOJT-UHFFFAOYSA-N Ammonium acetate Chemical compound N.CC(O)=O USFZMSVCRYTOJT-UHFFFAOYSA-N 0.000 description 2
- 239000005695 Ammonium acetate Substances 0.000 description 2
- 229940043376 ammonium acetate Drugs 0.000 description 2
- 235000019257 ammonium acetate Nutrition 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- XYIBRDXRRQCHLP-UHFFFAOYSA-N ethyl acetoacetate Chemical compound CCOC(=O)CC(C)=O XYIBRDXRRQCHLP-UHFFFAOYSA-N 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 239000003017 thermal stabilizer Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000003042 antagnostic effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Classifications
-
- 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
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3412—Heterocyclic compounds having nitrogen in the ring having one nitrogen atom in the ring
- C08K5/3432—Six-membered rings
-
- 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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
-
- 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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/02—Ingredients treated with inorganic substances
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention belongs to the technical field of chemical synthesis, and particularly relates to a dihydropyridine PVC composite heat stabilizer and a preparation method thereof, wherein the composite heat stabilizer is prepared from the following raw materials in parts by weight: 20-30 parts of dihydropyridine; 5-10 parts of an antioxidant; 5-10 parts of a plasticizer; 20-45 parts of a modified molecular sieve; 10-20 parts of zinc stearate; 5-10 parts of calcium stearate. The calcium-zinc composite stabilizer is prepared by compounding dihydropyridine and a sodium perchlorate modified molecular sieve, replaces components such as beta-diketone, bisphenol A, pentaerythritol and the like in the formula of the traditional calcium-zinc stabilizer, and reduces the dosage of hard calcium, hard zinc and calcium stearate. The PVC composite material has excellent synergistic effect and lubricating effect, can improve the thermal stability time of PVC products, prevent precipitation and blooming, improve later weather resistance and reduce production cost.
Description
Technical Field
The invention belongs to the technical field of chemical synthesis, and particularly relates to a dihydropyridine PVC composite heat stabilizer and a preparation method thereof.
Background
PVC is a short name for polyvinyl chloride resin. Is a thermoplastic linear polymer produced by free radical polymerization of vinyl chloride monomer. The industrial product is white or light yellow powder, has a relative density of 1.36, and has a chlorine content of 56-58%. Has the advantages of alkali resistance, wear resistance, good electrical insulation, flame retardancy, self-extinguishing property and the like. However, PVC has poor thermal stability, and when the PVC is heated to 140 ℃, hydrogen chloride is released to degrade, so that the processability is lost. The processing temperature is usually above 160-180 ℃, so that a heat stabilizer must be added during the PVC molding processing. PVC heat stabilizers are essential in PVC processing.
In order to solve the problem of poor thermal stability of PVC, a thermal stabilizer must be added during the PVC processing process to prevent thermal degradation. The heat stabilizer applied to PVC has various types, and mainly comprises a monomer stabilizer, a composite lead salt stabilizer, an organic tin heat stabilizer, an environment-friendly calcium-zinc stabilizer and the like. It plays the main roles of:
1. not only can effectively inhibit the initial coloring of the PVC ingredients, but also can keep the stability of the ingredients in the processing and using processes.
2. The ingredients have proper plasticizing rate and internal and external lubricity, so that the processing can be stably carried out.
3. Does not have antagonistic action with other adjuvants.
Among them, the most widely used stabilizer at present is an environment-friendly calcium zinc stabilizer. The environment-friendly calcium zinc stabilizer has the advantages of environmental protection, no toxicity, low price, easy obtainment of raw materials and the like, overcomes the defects of other heat stabilizers, becomes the mainstream heat stabilizer used at present, and has the problem of unstable processing later stage.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the dihydropyridine PVC composite heat stabilizer and the preparation method thereof overcome the defects of the prior art, and the dihydropyridine and perchlorate modified molecular sieve are added to improve the stability of initial whiteness, and zinc stearate is reduced as a raw material for improving the initial whiteness, so that the formula cost of the traditional calcium zinc stabilizer is reduced.
The dihydropyridine PVC composite heat stabilizer provided by the invention comprises the following raw materials in parts by weight:
wherein:
the modified molecular sieve is prepared according to the following method:
and (3) carrying out water removal treatment on the 4A type molecular sieve in an industrial microwave oven, taking out the 4A type molecular sieve, mixing the obtained product with perchlorate, cooling to room temperature, and fully grinding to obtain the modified molecular sieve. Wherein: the drying temperature is 350-.
The mass ratio of the perchlorate to the dried 4A type molecular sieve is 2: 3.
The plasticizer is preferably di-n-octyl phthalate.
The antioxidant is preferably an antioxidant 1076.
The preparation method of the dihydropyridine PVC composite heat stabilizer comprises the following steps:
adding dihydropyridine into a high-speed mixer, heating to 80-90 ℃, continuously adding the modified molecular sieve, keeping the temperature at 120 ℃, continuously stirring, adding an antioxidant, a plasticizer, calcium stearate and zinc stearate, uniformly stirring the materials, and discharging the materials to obtain the product.
Dihydropyridines can be prepared by co-heating (1 hour) ethyl acetoacetate and urotropine in an ethanol solution of ammonium acetate; cooling the obtained liquid to precipitate crystals, filtering, washing with ethanol, and drying in air to obtain yellowish powdery dihydropyridine.
The invention adopts dihydropyridine as a main stabilizer, wherein the dihydropyridine has a chemical formula of C13H19NO4Is a natural antioxidant. Has certain initial stability effect, and can improve the initial stability and initial whiteness of PVC products. In the products, dihydropyridine is used for solving the problems of initial whiteness and initial thermal stability of PVC processing, so that the products with lower price and excellent performance are designed.
Dihydropyridine of the formula:
compared with the prior art, the invention has the following beneficial effects:
1. the dihydropyridine composite heat stabilizer is prepared by compounding dihydropyridine and a sodium perchlorate modified molecular sieve, replaces components such as beta-diketone, bisphenol A, pentaerythritol and the like in the formula of the traditional calcium-zinc stabilizer, and reduces the dosage of hard calcium, hard zinc and calcium stearate. The PVC composite material has excellent synergistic effect and lubricating effect, can improve the thermal stability time of PVC products, prevent precipitation and blooming, improve later weather resistance and reduce production cost.
2. According to the national standard GB2113-82 'plastic whiteness experiment method', compared with the traditional calcium-zinc stabilizer, the dihydropyridine composite heat stabilizer prepared by the invention has excellent initial whiteness and better heat stability. From the comparison test of dynamic stability, it can also be found that the dihydropyridine composite heat stabilizer prepared by the invention can enhance the plasticizing capacity of PVC plastics and obviously prolong the dynamic thermal stability time. Through Congo red experiments, the static thermal stability of the stabilizer is obviously superior to that of the domestic environment-friendly stabilizer.
Detailed Description
The present invention will be further described with reference to the following examples.
Examples 1 to 3
Preparation of sodium perchlorate modified molecular sieve
And (3) carrying out water removal treatment on the 4A type molecular sieve in an industrial microwave oven, taking out the 4A type molecular sieve, mixing the obtained product with perchlorate, cooling to room temperature, and fully grinding to obtain the modified molecular sieve. The drying temperature is 375 +/-25 ℃, the drying time is 3h, and the mixing time is 20 min.
The mass ratio of the perchlorate to the dried 4A type molecular sieve is 2: 3.
Preparation of dihydropyridine PVC composite heat stabilizer:
dihydropyridines can be prepared by co-heating (1 hour) ethyl acetoacetate and urotropine in an ethanol solution of ammonium acetate; cooling the obtained liquid to precipitate crystals, filtering, washing with ethanol, and drying in air to obtain yellowish powdery dihydropyridine.
Adding dihydropyridine into a high-speed mixer, heating to 80-90 ℃, continuously adding the sodium perchlorate modified molecular sieve, keeping the temperature at 120 ℃, continuously stirring, adding the antioxidant, the plasticizer, the zinc stearate and the calcium stearate, uniformly stirring the materials, and discharging the materials to obtain the product.
The formulations of examples 1-3 are shown in Table 1.
TABLE 1 (in parts by weight)
| Raw materials | Example 1 | Example 2 | Example 3 |
| Dihydropyridines | 20 | 25 | 30 |
| Modified molecular sieve | 30 | 30 | 30 |
| Antioxidant agent | 5 | 5 | 5 |
| Plasticizer | 10 | 10 | 10 |
| Zinc stearate | 20 | 20 | 20 |
| Calcium stearate | 5 | 10 | 10 |
Table 2 shows a comparison of the formulations of specific PVC pipes produced using the dihydropyridine PVC composite heat stabilizer produced in examples 1-3.
TABLE 2 (in g)
The four PVC plastics prepared in table 2 were subjected to a heat-resistant whiteness test, and table 3 is a relative whiteness value measured by placing a test piece in a whiteness meter examined with a standard whiteness board having a whiteness of 85%. From table 3, it can be found that the calcium zinc stabilizer added with the dihydropyridine PVC composite heat stabilizer has superior heat stability compared with the equivalent traditional calcium zinc stabilizer.
It can also be found from the comparison experiment of dynamic thermal stability performance that the dynamic thermal stability time of PVC plastics can be obviously increased by using the dihydropyridine PVC composite thermal stabilizer (see Table 3).
TABLE 3
The plasticizing process at each stage of the formulation was analyzed from the rheology curves and is detailed in table 4.
TABLE 4
Test example
The dosage of the following sample formulas, comparative example 1 and comparative example 2 are parts by weight; the processing aid ACR-801 is purchased from Shandong Ruifeng chemical Co., Ltd.
The test formula is as follows: 100 parts of PVC resin, 0.8 part of polyethylene wax, 4 parts of plasticizer DOP, 4 parts of processing aid ACR-8013 and 4 parts of stabilizer prepared in example 1;
comparative example 1: 100 parts of PVC resin, 0.8 part of polyethylene wax, 4 parts of plasticizer DOP, 893 parts of processing aid ACR-8013 and 4 parts of environment-friendly stabilizer of certain well-known enterprise in China;
comparative example 2: 100 parts of PVC resin, 0.8 part of polyethylene wax, 4 parts of plasticizer DOP, 3 parts of processing aid ACR-8013 and 4 parts of British Samminsen environment-friendly stabilizer;
the components of the test formulation, comparative example 1 and comparative example 2 were mixed uniformly under the same test conditions, and then tested by the Congo Red test method (GB 2917-82) which is a polyvinyl chloride thermal stability test method, wherein the Congo Red time at 190 ℃ was 54 minutes (test formulation), 48 minutes (comparative example 1) and 55 minutes (comparative example 2), and the Congo Red time at 200 ℃ was 46 minutes (test formulation), 36 minutes (comparative example 1) and 46 minutes (comparative example 2).
The test data show that the thermal stability of the stabilizer is obviously superior to that of a certain well-known enterprise at home, and the performance of the stabilizer is basically close to that of similar products at home and abroad.
Of course, the foregoing is only a preferred embodiment of the invention and should not be taken as limiting the scope of the embodiments of the invention. The present invention is not limited to the above examples, and equivalent changes and modifications made by those skilled in the art within the spirit and scope of the present invention should be construed as being included in the scope of the present invention.
Claims (8)
1. A dihydropyridine PVC composite heat stabilizer is characterized in that: the composition is characterized by comprising the following raw materials in parts by weight:
2. the dihydropyridine PVC composite heat stabilizer according to claim 1, characterized in that: the modified molecular sieve is prepared according to the following method:
and (3) carrying out water removal treatment on the 4A type molecular sieve in an industrial microwave oven, taking out the 4A type molecular sieve, mixing the obtained product with perchlorate, cooling to room temperature, and fully grinding to obtain the modified molecular sieve.
3. The dihydropyridine PVC composite heat stabilizer according to claim 2, characterized in that: the drying temperature is 350-.
4. The dihydropyridine PVC composite heat stabilizer according to claim 2, characterized in that: the mass ratio of the perchlorate to the dried 4A type molecular sieve is 2: 3.
5. The dihydropyridine PVC composite heat stabilizer according to claim 1, characterized in that: the plasticizer is di-n-octyl phthalate.
6. The dihydropyridine PVC composite heat stabilizer according to claim 1, characterized in that: the antioxidant is antioxidant 1076.
7. A method for preparing dihydropyridine PVC composite heat stabilizer according to any one of claims 1 to 6, which is characterized in that: adding dihydropyridine into a high-speed mixer, heating, continuing to add the modified molecular sieve, keeping the temperature, continuously stirring, adding the antioxidant, the plasticizer, the zinc stearate and the calcium stearate, uniformly stirring the materials, and discharging the materials to obtain the product.
8. The preparation method of the dihydropyridine PVC composite heat stabilizer according to claim 7, characterized in that: the temperature is increased to 80-90 ℃, and the heat preservation temperature is 120 ℃.
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2021
- 2021-09-27 CN CN202111139735.9A patent/CN113773552A/en active Pending
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