CN115536915A - Low-atomization calcium zinc stabilizer for PVC (polyvinyl chloride) and stability test method thereof - Google Patents
Low-atomization calcium zinc stabilizer for PVC (polyvinyl chloride) and stability test method thereof Download PDFInfo
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Abstract
The invention discloses a low-atomization calcium zinc stabilizer for PVC and a stability test method thereof. The low-atomization calcium zinc stabilizer for PVC comprises the following preparation raw materials in parts by weight: 25-35 parts of zinc stearate, 15-30 parts of calcium stearate, 3-5 parts of stearoylbenzoylmethane, 10-40 parts of hydrotalcite and 10-30 parts of modified zeolite; the modified zeolite is obtained by jointly modifying a silane coupling agent and a cationic surfactant. The application provides a PVC is with low atomizing value of low atomizing calcium zinc stabilizer is low, and stability is good.
Description
Technical Field
The invention relates to the technical field of chemical stabilizers, in particular to a low-atomization calcium zinc stabilizer for PVC and a stability testing method thereof.
Background
Polyvinyl chloride (PVC) has the advantages of excellent comprehensive performance, low price and the like, and is widely applied. However, the poor thermal stability of polyvinyl chloride necessitates the addition of suitable thermal stabilizers to inhibit the degradation of polyvinyl chloride during processing. Heat stabilizers can be classified into the following categories: lead salts, metal soaps, organotin compounds and rare earth heat stabilizers. However, the common lead salt and organic tin heat stabilizer in the market have certain toxicity. The single calcium-zinc heat stabilizer cannot meet the application requirements, and a proper amount of auxiliary heat stabilizer is usually added for improving the heat stability, wherein the auxiliary heat stabilizer mainly comprises polyol, beta-diketone, phosphite ester, epoxy compound, hydrotalcite and zeolite.
In the research process, the applicant finds that the addition of zeolite can reduce the cost of the calcium-zinc heat stabilizer, but the zeolite has higher water content, so that the atomization value of the PVC stabilizer is higher, and the zeolite is not suitable for PVC products with requirements on the atomization value.
Therefore, there is a need to develop a low fogging calcium zinc stabilizer for PVC.
Disclosure of Invention
In order to reduce the atomization value of the calcium zinc stabilizer, the application provides a low-atomization calcium zinc stabilizer for PVC.
In a first aspect, the application provides a low-atomization calcium zinc stabilizer for PVC, which is realized by adopting the following technical scheme: the low-atomization calcium zinc stabilizer for PVC comprises the following raw materials in parts by weight: 25-35 parts of zinc stearate, 15-30 parts of calcium stearate, 3-5 parts of stearoylbenzoylmethane, 10-40 parts of hydrotalcite and 10-30 parts of modified zeolite; the modified zeolite is obtained by jointly modifying a silane coupling agent and a cationic surfactant.
By adopting the technical scheme, the silane coupling agent is chemically bonded with the hydroxyl on the surface of the zeolite, so that silicon hydroxyl on the surface of the zeolite is reduced, a hydrophobic hydrocarbon chain is loaded on the surface of the zeolite, the cationic surfactant is easy to generate electrostatic adsorption with negative charges on the surface of the zeolite to make the zeolite hydrophobic, and the silane coupling agent and the cationic surfactant jointly modify the zeolite, so that the water content of the zeolite is further reduced, and the atomization value of the stabilizing agent is reduced.
Preferably, the preparation raw materials also comprise 1-5 parts of dihydropyridine or 3-7 parts of 1, 3-dimethyl-6-aminouracil by weight.
The 1, 3-dimethyl-6-aminouracil has the capability of replacing unstable chlorine atoms in PVC, and can effectively improve the stability of the low-fogging calcium zinc stabilizer for PVC. Dihydropyridine has antioxidant effect, and can improve initial stability of low-atomization calcium zinc stabilizer for PVC, and reduce color difference of sample pieces at 5min, 7min and 10 min.
Preferably, the preparation method of the modified zeolite comprises the following steps:
s1, grinding zeolite for later use;
s2, adding a silane coupling agent into isopropanol, uniformly stirring, and adding a cationic surfactant to obtain a modified solution;
s3, adding the ground zeolite into the modification solution, heating and refluxing, washing with ethanol, and drying to obtain modified zeolite;
the mass ratio of the zeolite, the silane coupling agent and the cationic surfactant is 1 (0.06-0.1) to 0.05-0.08.
Preferably, the mass ratio of the zeolite to the silane coupling agent to the cationic surfactant is 1.
According to the application, the mass ratio of the zeolite to the silane coupling agent to the cationic surfactant is controlled to be 1 (0.06-0.1) to 0.05-0.08, so that internal pore channels and the specific surface area of the zeolite can be kept, the stability of the low-atomization calcium-zinc stabilizer for PVC is not influenced, and the hydrophobicity of the modified zeolite can be improved. Thereby reducing the atomization value of the low atomization calcium zinc stabilizer for PVC. When the mass ratio of the zeolite, the silane coupling agent and the cationic surfactant is 1.08.
Preferably, the silane coupling agent is a fluorine-containing silane coupling agent.
Fluorine atoms are introduced into the fluorine-containing silane coupling agent, so that the hydrophobicity of the modified zeolite is further improved, and the atomization value of the low-atomization calcium-zinc stabilizer for PVC is reduced.
Preferably, the fluorine-containing silane coupling agent is heptadecafluorodecyltriethoxysilane.
The heptadecafluorodecyl triethoxysilane has low surface tension, good compounding effect with cationic surfactant, and long carbon chain, i.e. long hydrophobic chain, of the heptadecafluorodecyl triethoxysilane, so that the hydrophobicity of the modified zeolite is improved.
Preferably, the cationic surfactant is a dialkyl quaternary ammonium salt.
Preferably, the dialkyl quaternary ammonium salt is octadecyl diester quaternary ammonium salt YH-866.
The octadecyl diester quaternary ammonium salt YH-866 not only has hygroscopicity, but also has stronger hydrophobic property of the dialkyl, the carbon chain of the octadecyl diester quaternary ammonium salt YH-866 is long, the hydrophobic chain length, and the interaction between the octadecyl diester quaternary ammonium salt YH-866 and the long carbon chain of the heptadecafluorodecyl triethoxysilane reduces the water content of the zeolite.
In a second aspect, the application provides a method for testing stability of a low-atomization calcium-zinc stabilizer for PVC, which is implemented by adopting the following technical scheme:
a method for testing the stability of a low-atomization calcium-zinc stabilizer for PVC comprises the following steps:
s1, uniformly mixing PVC, stone powder, titanium white R105, stearic acid, paraffin and PVC by using a low-atomization calcium-zinc stabilizer to obtain a mixture;
s2, setting the temperature of the open mill to be 210 ℃ and the gap between rollers of the open mill to be 4mm;
s3, placing the mixture in an open mill, and sampling for 3min, 5min, 7min and 10min respectively;
and S4, taking the 3min sample as a standard component, and measuring the color difference values of the sample at 5min, 7min and 10min respectively.
Preferably, the mass ratio of the PVC, the stone powder, the titanium dioxide, the stearic acid, the paraffin and the PVC low-atomization calcium-zinc stabilizer is 375.
The low-atomization calcium zinc stabilizer for PVC has excellent stability, and the color difference value of a sample piece is low under 5min, 7min and 10 min.
In summary, the present application has the following beneficial effects:
1. according to the method, the zeolite is modified by the silane coupling agent and the cationic surfactant together, the silane coupling agent and hydroxyl on the surface of the zeolite are chemically bonded, silicon hydroxyl on the surface of the zeolite is reduced, a hydrophobic hydrocarbon chain is loaded on the surface of the zeolite, the cationic surfactant is easy to generate electrostatic adsorption with negative charges on the surface of the zeolite to make the zeolite hydrophobic, and the silane coupling agent and the cationic surfactant act together to further reduce the water content of the zeolite, so that the atomization value of the stabilizer is reduced.
2. The method adopts the heptadecafluorodecyl triethoxysilane, the surface tension is low, the compounding effect of the heptadecafluorodecyl triethoxysilane and the cationic surfactant is good, and the carbon chain length of the heptadecafluorodecyl triethoxysilane, namely the hydrophobic chain length, improves the hydrophobicity of the modified zeolite.
3. According to the application, the octadecyl diester quaternary ammonium salt YH-866 is hygroscopic, the hydrophobicity of the dialkyl is stronger, the carbon chain of the octadecyl diester quaternary ammonium salt YH-866 is long, the length of the hydrophobic chain is long, and the octadecyl diester quaternary ammonium salt YH-866 and the long carbon chain of heptadecafluorodecyl triethoxysilane interact with each other, so that the water content of zeolite is reduced.
Detailed Description
The present application will be described in further detail with reference to examples.
Preparation example
Preparation examples 1 to 6 provide a modified zeolite, and the following description will be made by taking preparation example 1 as an example.
The modified zeolite provided by the preparation example 1 comprises the following preparation steps:
s1, grinding 10g 4A zeolite to the particle size of not more than 100 meshes for later use;
s2, adding 0.6g of silane coupling agent KH-550 into 200mL of isopropanol, uniformly stirring, and adding 0.5g of hexadecyl trimethyl ammonium bromide to obtain a modified solution;
and S3, adding the ground zeolite into the modification solution, heating and refluxing for 2 hours at 90 ℃, washing with ethanol for three times, and drying for 6 hours at 100 ℃ to obtain the modified zeolite.
Preparation examples 2 to 3 differed from preparation example 1 only in that: the modified zeolite has different mass of each preparation raw material, and is specifically shown in table 1.
TABLE 1 preparation examples 1 to 3 preparation of modified zeolites
Preparation 4 differed from preparation 3 only in that: the silane coupling agent KH-550 and the like are replaced by trifluoropropane trimethoxy silane.
Preparation 5 differs from preparation 3 only in that: replacing the silane coupling agent KH-550 with heptadecafluorodecyltriethoxysilane.
Preparation 6 differed from preparation 5 only in that: equal mass replacement of cetyl trimethyl ammonium bromide with octadecyl diester quaternary ammonium salt YH-866 (purchased from Zhengzhou Yihe Fine Chemicals Co., ltd.).
Preparation of comparative example
Comparative example 1 was prepared, differing from preparation example 1 only in that: the silane coupling agent KH-550 and the like are replaced by hexadecyl trimethyl ammonium bromide.
Comparative example 2 was prepared, differing from preparation example 1 only in that: and replacing hexadecyl trimethyl ammonium bromide with silane coupling agent KH-550 in equal mass.
Examples
Examples 1-9 provide a low fogging calcium zinc stabilizer for PVC, and are described below with reference to example 1.
The low-fogging calcium zinc stabilizer for PVC provided by the embodiment 1 comprises the following preparation steps:
35g of zinc stearate, 15g of calcium stearate, 5g of stearoylbenzoylmethane, 15g of hydrotalcite, 25g of modified zeolite (from preparation example 1) and 5g of dihydropyridine were mixed uniformly to obtain a low-fogging calcium-zinc stabilizer for PVC.
Examples 2-4, which differ from example 1 only in that: the quality of each raw material for preparing the low-atomization calcium-zinc stabilizer for PVC is different, and the specific quality is shown in Table 2.
TABLE 2 examples 1-4 Mass/g of raw materials for each preparation of low-fogging calcium-zinc stabilizers for PVC
Examples 5 to 9, which differ from example 3 only in that: the source of the modified zeolite is different and is shown in table 3.
Table 3 sources of examples 3, 5-9 modified zeolites
Group of | Example 3 | Example 5 | Example 6 | Example 7 | Example 8 | Example 9 |
Modified zeolite sources | Preparation example 1 | Preparation example 2 | Preparation example 3 | Preparation example 4 | Preparation example 5 | Preparation example 6 |
Comparative example
Comparative example 1, which differs from example 4 only in that: the modified zeolite was derived from the preparation of comparative example 1.
Comparative example 2, which differs from example 4 only in that: the modified zeolite was derived from the preparation of comparative example 2.
Comparative example 3, which differs from example 4 only in that: the modified zeolite and the like are replaced by 4A zeolite.
Atomization performance test
The fogging test was performed on the low fogging calcium zinc stabilizer for PVC prepared in examples 1 to 9 and comparative examples 1 to 3 of the present application according to the PV3015 standard, and the fogging condensate value was recorded, and the test results are shown in Table 4.
Table 4 fogging test data
Among them, the organotin stabilizer YT181 from zibo and yue jingmao ltd was purchased.
The present application is described in detail below with respect to the test data of table 4.
From the experimental data of example 4 and comparative example 3, it can be seen that the modification of zeolite 4A in the present application reduces the haze condensate value of the stabilizer due to the reduced water content of the zeolite.
From the experimental data of example 4 and comparative examples 1 and 2, it is known that the silane coupling agent and the cationic surfactant modify the zeolite to reduce the water content of the zeolite, thereby reducing the fogging value of the stabilizer.
From the experimental data of examples 3, 5, 6, it can be seen that the haze condensate values for PVC with the low fogging calcium zinc stabilizer are lower when the mass ratio of zeolite, silane coupling agent and cationic surfactant is 1.
From the experimental data of examples 6, 7 and 8, it can be seen that example 6 is the silane coupling agent KH-550, example 7 is trifluoropropyltrimethoxysilane, example 8 is heptadecafluorodecyltriethoxysilane, and the value of fogging condensate of the stabilizer corresponding to example 8 is significantly lower than that of the stabilizer corresponding to example 7 and lower than that of the stabilizer corresponding to example 6. The reason is that the surface tension of the heptadecafluorodecyl triethoxysilane is low, the compounding effect with the cationic surfactant is good, and the carbon chain length of the heptadecafluorodecyl triethoxysilane, namely the hydrophobic chain length, improves the hydrophobicity of the modified zeolite.
From the experimental data of examples 8 and 9, it can be seen that example 8 is cetyltrimethylammonium bromide, example 9 is octadecyl diester quat YH-866, and the value of the fogging condensate of the corresponding stabilizer of example 9 is significantly lower than that of the corresponding stabilizer of example 8. The reason is that the octadecyl diester quaternary ammonium salt YH-866 not only has hygroscopicity, but also has stronger hydrophobic property of the diester, the carbon chain of the octadecyl diester quaternary ammonium salt YH-866 is long, the hydrophobic chain is long, and the octadecyl diester quaternary ammonium salt YH-866 interacts with the long carbon chain of the heptadecafluorodecyltriethoxysilane, so that the water content of the zeolite is reduced.
Stability test
Stability tests were performed on the low-fogging calcium-zinc stabilizers for PVC prepared in examples 1-9 and comparative examples 1-3 of the present application, the test results are shown in table 5, and the test procedures were:
s1, uniformly mixing PVC, stone powder, titanium dioxide R105, stearic acid, paraffin and PVC with a low-atomization calcium-zinc stabilizer according to a mass ratio of 375;
s2, setting the temperature of the open mill to be 210 ℃ and the gap between rollers of the open mill to be 4mm;
s3, placing the mixture in an open mill, and sampling for 3min, 5min, 7min and 10min respectively;
and S4, taking the 3min sample as a standard component, and measuring the delta E values of the sample under the conditions of 5min, 7min and 10min by using a color difference meter respectively.
Table 5 stability test results
The present application is described in detail below with respect to the test data of table 5.
The low-atomization calcium zinc stabilizer for PVC prepared by the application is low in atomization value and excellent in stability, and the color difference value of the sample piece is low under 5min, 7min and 10 min.
From the experimental data of example 4 and comparative examples 1, 2 and 3, it can be seen that the zeolite modified by the silane coupling agent and the cationic surfactant does not lower the stability of the low-fogging calcium zinc stabilizer for PVC, but improves the stability, and the color difference values of the samples are low at 5min, 7min and 10 min.
The specific embodiments are only for explaining the present application and are not limiting to the present application, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The low-atomization calcium zinc stabilizer for PVC is characterized by comprising the following raw materials in parts by weight: 25-35 parts of zinc stearate, 15-30 parts of calcium stearate, 3-5 parts of stearoylbenzoylmethane, 10-40 parts of hydrotalcite and 10-30 parts of modified zeolite;
the modified zeolite is obtained by jointly modifying a silane coupling agent and a cationic surfactant.
2. The low fogging calcium zinc stabilizer for PVC according to claim 1, characterized in that it is prepared from raw materials further including 1-5 parts by weight of dihydropyridine or 3-7 parts by weight of 1, 3-dimethyl-6-aminouracil.
3. The low atomization calcium zinc stabilizer for PVC according to claim 1, wherein the preparation method of the modified zeolite comprises the following steps:
s1, grinding zeolite for later use;
s2, adding a silane coupling agent into isopropanol, uniformly stirring, and adding a cationic surfactant to obtain a modified solution;
s3, adding the ground zeolite into the modification solution, heating and refluxing, washing with ethanol, and drying to obtain modified zeolite;
the mass ratio of the zeolite to the silane coupling agent to the cationic surfactant is 1 (0.06-0.1) to 0.05-0.08.
4. The low-fogging calcium-zinc stabilizer for PVC according to claim 3, characterised in that the silane coupling agent is a fluorine-containing silane coupling agent.
5. The low-fogging calcium-zinc stabilizer for PVC according to claim 4, characterised in that the fluorine-containing silane coupling agent is heptadecafluorodecyltriethoxysilane.
6. The low fogging calcium zinc stabilizer for PVC according to claim 3, characterised in that the cationic surfactant is a dialkyl quaternary ammonium salt.
7. The low fogging calcium zinc stabilizer for PVC according to claim 6, characterised in that the quaternary ammonium dialkyl salt is octadecyl diester based quaternary ammonium salt YH-866.
8. The low atomization calcium zinc stabilizer for PVC according to claim 3, wherein the mass ratio of the zeolite to the silane coupling agent to the cationic surfactant is 1.
9. A method for testing the stability of a low-atomization calcium zinc stabilizer for PVC is characterized by comprising the following steps:
s1, uniformly mixing PVC, stone powder, titanium white R105, stearic acid, paraffin and the low-atomization calcium-zinc stabilizer for PVC according to claim 1 to obtain a mixture;
s2, setting the temperature of the open mill to 210 ℃ and the gap between rollers of the open mill to 4mm;
s3, placing the mixture in an open mill, and sampling for 3min, 5min, 7min and 10min respectively;
and S4, taking the 3min sample as a standard component, and measuring the color difference values of the sample at 5min, 7min and 10min respectively.
10. The method for testing the stability of the low-fogging calcium-zinc stabilizer for PVC according to claim 9, is characterized in that the mass ratio of the PVC, stone powder, titanium dioxide, stearic acid, paraffin wax and the low-fogging calcium-zinc stabilizer for PVC is 375.
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