CN116063742A - Polyvinyl chloride composite processing aid and preparation method thereof - Google Patents
Polyvinyl chloride composite processing aid and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a polyvinyl chloride composite processing aid and a preparation method thereof, belonging to the technical field of polyvinyl chloride processing aids, wherein the preparation method comprises the following steps: preparing a main stabilizer, preparing an auxiliary stabilizer, preparing a synergist and mixing; the preparation synergist is prepared by placing nano bentonite at 600-650 ℃ for high-temperature treatment for 1.5-2 hours to obtain nano bentonite after high-temperature treatment, adding the nano bentonite after high-temperature treatment, octadecyl dimethyl betaine and deionized water into a high-shear reaction kettle, carrying out high-shear, adding gas-phase nano silicon dioxide, continuing high-shear, and then drying to obtain the synergist; the invention can improve the long-term heat stability, processing fluidity and initial coloring property of the polyvinyl chloride, and simultaneously improve the impact resistance of the polyvinyl chloride, and ensure the chemical stability, low-temperature toughness and transparency of the polyvinyl chloride.
Description
Technical Field
The invention relates to the technical field of polyvinyl chloride processing aids, in particular to a polyvinyl chloride composite processing aid and a preparation method thereof.
Background
Polyvinyl chloride is a polymer formed by polymerizing vinyl chloride monomers under the action of light and heat by a free radical polymerization reaction mechanism under the action of an initiator such as peroxide and azo compounds. The polyvinyl chloride is white powder with an amorphous structure, has small branching degree, poor light and heat stability, can be decomposed to generate hydrogen chloride after being exposed to sunlight at the temperature of more than 100 ℃ or for a long time, and is further automatically catalyzed to decompose to cause discoloration, and the physical and mechanical properties are also rapidly reduced.
In order to solve the problem of poor thermal stability of polyvinyl chloride, a corresponding stabilizer is needed to be added into a processing aid of the polyvinyl chloride so as to repair the defects of a polyvinyl chloride chain, meanwhile, hydrogen chloride generated by dechlorination of the polyvinyl chloride is absorbed in time, the main stabilizer comprises lead salt, metal soap, organic tin, organic antimony, organic rare earth, pure organic compounds and the like, the auxiliary stabilizer comprises phosphorous acid vinegar, epoxidized soybean oil, hindered phenol and the like, but the long-term thermal stability of a single stabilizer is poor, and in order to improve the long-term thermal stability of the polyvinyl chloride, a plurality of main stabilizers and auxiliary stabilizers are generally mixed in production to prepare a composite heat stabilizer.
However, the dispersibility and initial colorability of the composite heat stabilizer are poor, and thus the processability and initial colorability of the polyvinyl chloride are affected, and in order to improve the processability and initial colorability of the polyvinyl chloride, it is necessary to add an increased amount of a lubricant and a synergist, but the addition of a large amount of an additive can improve the long-term heat stability, the processability and the initial colorability of the polyvinyl chloride, but affects the chemical stability, the low-temperature toughness and the transparency of the polyvinyl chloride, and also causes the impact resistance of the polyvinyl chloride to be lowered.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a polyvinyl chloride composite processing aid and a preparation method thereof, which can improve the long-term heat stability, processing fluidity and initial colorability of polyvinyl chloride, improve the impact resistance of the polyvinyl chloride and ensure the chemical stability, low-temperature toughness and transparency of the polyvinyl chloride.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the preparation method of the polyvinyl chloride composite processing aid comprises the following steps: preparing a main stabilizer, preparing an auxiliary stabilizer, preparing a synergist and mixing.
Mixing calcium stearate, zinc laurate and zinc oxide, performing first ball milling, controlling the ball-material ratio at 10-15:1, the rotating speed at 240-280rpm and the time at 35-40min during the first ball milling, adding a silane coupling agent KH-550, triallyl cyanurate and nano titanium dioxide, performing second ball milling, controlling the ball-material ratio at 10-15:1, the rotating speed at 300-350rpm and the time at 40-45min during the second ball milling, and obtaining the main stabilizer after the second ball milling;
the weight ratio of the calcium stearate to the zinc laurate to the zinc oxide to the silane coupling agent KH-550 to the triallyl cyanurate to the nano titanium dioxide is 30-35:40-45:10-12:4-6:1-1.5:1-1.5:3-5;
the particle size of the nano titanium dioxide is 20-50nm.
The preparation auxiliary stabilizer is prepared by adding epoxidized soybean oil, pentaerythritol, hydrotalcite and modified silica sol into a reaction kettle, and stirring at a stirring speed of 80-100rpm for 45-50min at 20-25 ℃ to obtain the auxiliary stabilizer;
the weight ratio of the epoxidized soybean oil to the pentaerythritol to the hydrotalcite to the modified silica sol is 10-15:20-25:4-6:5-8;
the preparation method of the modified silica sol comprises the following steps: adding silica sol into a reaction kettle, regulating the pH of the silica sol to 7.5-8 by using a hydrochloric acid aqueous solution with the mass fraction of 36-38%, then adding a silane coupling agent KH-550 and a titanate coupling agent NDZ-401 into the reaction kettle, stirring at the stirring speed of 100-120rpm for 25-30min at the temperature of 20-25 ℃, adding chitosan oligosaccharide, and continuously stirring for 1-1.5h to obtain modified silica sol;
the weight ratio of the silica sol to the silane coupling agent KH-550 to the titanate coupling agent NDZ-401 to the chitosan oligosaccharide is 50-60:2-3:1-2:2-4;
the pH of the silica sol is 9-10, the content of silicon dioxide is 28-32%, and the particle size of the silicon dioxide is 10-20nm.
The preparation of the synergist comprises the steps of placing nano bentonite at 600-650 ℃ for high-temperature treatment for 1.5-2 hours to obtain nano bentonite after high-temperature treatment, adding the nano bentonite after high-temperature treatment, octadecyl dimethyl betaine and deionized water into a high-shear reaction kettle, carrying out high shear at a high shear rate of 2000-2500rpm at 20-25 ℃, adding fumed silica after 20-25min, continuing high shear for 20-25min, and then placing at 120-125 ℃ for drying to obtain the synergist;
the weight ratio of the nanometer bentonite after high-temperature treatment to the octadecyl dimethyl betaine to the deionized water to the gas phase nanometer silicon dioxide is 50-55:10-12:180-190:3-5;
the particle size of the nanometer bentonite is 50-80nm;
the particle size of the gas phase nano silicon dioxide is 30-50nm.
Adding the main stabilizer, the auxiliary stabilizer and the synergist into a reaction kettle, and stirring at a stirring speed of 120-150rpm for 1-1.5h at 20-25 ℃ to obtain a polyvinyl chloride composite processing aid;
the weight ratio of the main stabilizer to the auxiliary stabilizer to the synergist is 40-50:20-25:8-10:12-15.
A polyvinyl chloride composite processing aid is prepared by the method.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the invention, the long-term thermal stability of the polyvinyl chloride can be improved by adding the synergist in the preparation of the polyvinyl chloride composite processing aid, and the polyvinyl chloride prepared by the polyvinyl chloride composite processing aid is blackened after being placed at 185 ℃ for 100-110 min;
(2) According to the invention, the flow processability of the polyvinyl chloride can be improved by adding the synergist in the preparation of the polyvinyl chloride composite processing aid, and the melt index of the polyvinyl chloride prepared by the polyvinyl chloride composite processing aid is 8.5-9.2g/10min;
(3) According to the invention, the initial colorability of the polyvinyl chloride can be improved by adding the modified silica sol in the step of preparing the auxiliary stabilizer, and the initial color change time (Congo red method) of the polyvinyl chloride prepared by the polyvinyl chloride composite processing aid is 148-151min;
(4) According to the invention, the synergist is added in the preparation of the polyvinyl chloride composite processing aid, so that the impact resistance of the polyvinyl chloride can be improved, and the notch impact strength of the polyvinyl chloride prepared by the polyvinyl chloride composite processing aid is 15.5-16.1kJ/m at 23 DEG C 2 ；
(5) The invention can be prepared by adding the modified silica sol in the step of preparing the auxiliary stabilizer and adding the synergist in the preparation of the polyvinyl chloride composite processing aidThe low-temperature toughness of the polyvinyl chloride can be improved, and the notch impact strength of the polyvinyl chloride prepared by the polyvinyl chloride composite processing aid is 15.2-15.7kJ/m at the temperature of minus 15 DEG C 2 ；
(6) According to the invention, the transparency of the polyvinyl chloride can be improved by adding the modified silica sol in the step of preparing the auxiliary stabilizer, and the light transmittance of the polyvinyl chloride prepared by the polyvinyl chloride composite processing aid is 91.8-92.3%;
(7) According to the invention, the chemical stability of the polyvinyl chloride can be improved by adding the modified silica sol in the step of preparing the auxiliary stabilizer, the polyvinyl chloride prepared by the polyvinyl chloride composite processing aid is completely soaked in a sulfuric acid aqueous solution with the mass fraction of 30% for 100d, the mass loss rate is 0.73-0.83%, and the polyvinyl chloride prepared by the polyvinyl chloride composite processing aid is completely soaked in a sodium hydroxide aqueous solution with the mass fraction of 30% for 100d, and the mass loss rate is 0.39-0.44%.
Detailed Description
Specific embodiments of the present invention will now be described in order to provide a clearer understanding of the technical features, objects and effects of the present invention.
Example 1
A preparation method of a polyvinyl chloride composite processing aid specifically comprises the following steps:
1. preparing a main stabilizer: mixing calcium stearate, zinc laurate and zinc oxide, performing first ball milling, controlling the ball-material ratio at 10:1, the rotating speed at 240rpm and the time at 35min, adding a silane coupling agent KH-550, triallyl cyanurate and nano titanium dioxide, performing second ball milling, controlling the ball-material ratio at 10:1 and the rotating speed at 300rpm and the time at 40min, and obtaining a main stabilizer after the second ball milling is finished;
the weight ratio of the calcium stearate to the zinc laurate to the zinc oxide to the silane coupling agent KH-550 to the triallyl cyanurate to the nano titanium dioxide is 30:40:10:4:1:1:3;
the particle size of the nano titanium dioxide is 20nm.
2. Preparing an auxiliary stabilizer: adding epoxidized soybean oil, pentaerythritol, hydrotalcite and modified silica sol into a reaction kettle, and stirring at 20 ℃ for 45min at a stirring speed of 80rpm to obtain an auxiliary stabilizer;
the weight ratio of the epoxidized soybean oil to the pentaerythritol to the hydrotalcite to the modified silica sol is 10:20:4:5;
the preparation method of the modified silica sol comprises the following steps: adding silica sol into a reaction kettle, regulating the pH of the silica sol to 7.5 by using a hydrochloric acid aqueous solution with the mass fraction of 36%, then adding a silane coupling agent KH-550 and a titanate coupling agent NDZ-401 into the reaction kettle, stirring at the stirring speed of 100rpm at 20 ℃ for 25min, adding chitosan oligosaccharide, and continuing stirring for 1h to obtain modified silica sol;
the weight ratio of the silica sol to the silane coupling agent KH-550 to the titanate coupling agent NDZ-401 to the chitosan oligosaccharide is 50:2:1:2;
the pH of the silica sol is 9, the silica content is 28%, and the particle size of the silica is 10nm.
3. Preparing a synergist: the method comprises the steps of (1) placing nano bentonite at 600 ℃ for 1.5h to obtain nano bentonite after high-temperature treatment, adding the nano bentonite after high-temperature treatment, octadecyl dimethyl betaine and deionized water into a high-shear reaction kettle, performing high-shear at a high-shear speed of 2000rpm at 20 ℃, adding fumed silica after 20min, continuing high-shear for 20min, and then drying at 120 ℃ to obtain a synergist;
the weight ratio of the nanometer bentonite after high-temperature treatment to the octadecyl dimethyl betaine to the deionized water to the gas phase nanometer silicon dioxide is 50:10:180:3;
the particle size of the nanometer bentonite is 50nm;
the particle size of the gas phase nano silicon dioxide is 30nm.
4. Mixing: adding the main stabilizer, the auxiliary stabilizer and the synergist into a reaction kettle, and stirring for 1h at the stirring speed of 120rpm at the temperature of 20 ℃ to obtain a polyvinyl chloride composite processing aid;
the weight ratio of the main stabilizer to the auxiliary stabilizer to the synergist is 40:20:8:12.
Example 2
A preparation method of a polyvinyl chloride composite processing aid specifically comprises the following steps:
1. preparing a main stabilizer: mixing calcium stearate, zinc laurate and zinc oxide, performing first ball milling, controlling the ball-material ratio at 12:1, the rotating speed at 250rpm and the time at 38min, adding a silane coupling agent KH-550, triallyl cyanurate and nano titanium dioxide, performing second ball milling, controlling the ball-material ratio at 12:1, the rotating speed at 320rpm and the time at 42min, and obtaining a main stabilizer after the second ball milling is finished;
the weight ratio of the calcium stearate to the zinc laurate to the zinc oxide to the silane coupling agent KH-550 to the triallyl cyanurate to the nano titanium dioxide is 32:42:11:5:1.2:1.2:4;
the particle size of the nano titanium dioxide is 30nm.
2. Preparing an auxiliary stabilizer: adding epoxidized soybean oil, pentaerythritol, hydrotalcite and modified silica sol into a reaction kettle, and stirring at a stirring speed of 90rpm at 22 ℃ for 48min to obtain an auxiliary stabilizer;
the weight ratio of the epoxidized soybean oil to the pentaerythritol to the hydrotalcite to the modified silica sol is 12:22:5:6;
the preparation method of the modified silica sol comprises the following steps: adding silica sol into a reaction kettle, regulating the pH of the silica sol to 7.8 by using 37% hydrochloric acid aqueous solution by mass fraction, then adding a silane coupling agent KH-550 and a titanate coupling agent NDZ-401 into the reaction kettle, stirring at a stirring speed of 110rpm at 22 ℃ for 28min, adding chitosan oligosaccharide, and continuously stirring for 1.2h to obtain modified silica sol;
the weight ratio of the silica sol to the silane coupling agent KH-550 to the titanate coupling agent NDZ-401 to the chitosan oligosaccharide is 55:2.5:1.5:3;
the pH of the silica sol is 9.5, the silica content is 30%, and the particle size of the silica is 15nm.
3. Preparing a synergist: the nanometer bentonite is placed at 620 ℃ for high-temperature treatment for 1.8 hours, the nanometer bentonite after high-temperature treatment is obtained, the nanometer bentonite after high-temperature treatment, octadecyl dimethyl betaine and deionized water are added into a high-shear reaction kettle, high-shear is carried out at a high-shear speed of 2200rpm at 22 ℃, gas-phase nanometer silicon dioxide is added after 22 minutes, high-shear is continued for 22 minutes, and then the nanometer bentonite is placed at 122 ℃ for drying, so that a synergistic agent is obtained;
the weight ratio of the nanometer bentonite after high-temperature treatment to the octadecyl dimethyl betaine to the deionized water to the gas phase nanometer silicon dioxide is 52:11:185:4;
the particle size of the nanometer bentonite is 60nm;
the particle size of the gas phase nano silicon dioxide is 40nm.
4. Mixing: adding the main stabilizer, the auxiliary stabilizer and the synergist into a reaction kettle, and stirring at a stirring speed of 140rpm at 22 ℃ for 1.2 hours to obtain a polyvinyl chloride composite processing aid;
the weight ratio of the main stabilizer to the auxiliary stabilizer to the synergist is 45:22:9:14.
Example 3
A preparation method of a polyvinyl chloride composite processing aid specifically comprises the following steps:
1. preparing a main stabilizer: mixing calcium stearate, zinc laurate and zinc oxide, performing first ball milling, controlling the ball-material ratio at 15:1, the rotating speed at 280rpm and the time at 40min, adding a silane coupling agent KH-550, triallyl cyanurate and nano titanium dioxide, performing second ball milling, controlling the ball-material ratio at 15:1 and the rotating speed at 350rpm and the time at 45min, and obtaining a main stabilizer after the second ball milling is finished;
the weight ratio of the calcium stearate to the zinc laurate to the zinc oxide to the silane coupling agent KH-550 to the triallyl cyanurate to the nano titanium dioxide is 35:45:12:6:1.5:1.5:5;
the particle size of the nano titanium dioxide is 50nm.
2. Preparing an auxiliary stabilizer: adding epoxidized soybean oil, pentaerythritol, hydrotalcite and modified silica sol into a reaction kettle, and stirring at 25 ℃ for 50min at a stirring speed of 100rpm to obtain an auxiliary stabilizer;
the weight ratio of the epoxidized soybean oil to the pentaerythritol to the hydrotalcite to the modified silica sol is 15:25:6:8;
the preparation method of the modified silica sol comprises the following steps: adding silica sol into a reaction kettle, regulating the pH of the silica sol to 8 by using a hydrochloric acid aqueous solution with the mass fraction of 38%, then adding a silane coupling agent KH-550 and a titanate coupling agent NDZ-401 into the reaction kettle, stirring for 30min at the stirring speed of 120rpm at 25 ℃, adding chitosan oligosaccharide, and continuing stirring for 1.5h to obtain modified silica sol;
the weight ratio of the silica sol to the silane coupling agent KH-550 to the titanate coupling agent NDZ-401 to the chitosan oligosaccharide is 60:3:2:4;
the pH of the silica sol is 10, the silica content is 32%, and the particle size of the silica is 20nm.
3. Preparing a synergist: the method comprises the steps of (1) placing nano bentonite at 650 ℃ for 2h, obtaining nano bentonite after high-temperature treatment, adding the nano bentonite after high-temperature treatment, octadecyl dimethyl betaine and deionized water into a high-shear reaction kettle, performing high-shear at a high-shear speed of 2500rpm at 25 ℃, adding fumed silica after 25min, continuing high-shear for 25min, and then drying at 125 ℃ to obtain a synergist;
the weight ratio of the nanometer bentonite after high-temperature treatment to the octadecyl dimethyl betaine to the deionized water to the gas phase nanometer silicon dioxide is 55:12:190:5;
the particle size of the nanometer bentonite is 80nm;
the particle size of the gas phase nano silicon dioxide is 50nm.
4. Mixing: adding the main stabilizer, the auxiliary stabilizer and the synergist into a reaction kettle, and stirring at the stirring speed of 150rpm for 1.5 hours at the temperature of 25 ℃ to obtain a polyvinyl chloride composite processing aid;
the weight ratio of the main stabilizer to the auxiliary stabilizer to the synergist is 50:25:10:15.
Comparative example 1
The preparation method of the polyvinyl chloride composite processing aid in the embodiment 1 is characterized in that: the step 2 of preparing auxiliary stabilizing agent omits the addition of modified silica sol.
Comparative example 2
The preparation method of the polyvinyl chloride composite processing aid in the embodiment 1 is characterized in that: the step of preparing the synergist in the step 3 is omitted, and the addition of the synergist in the step 4 is omitted.
Test example 1
The polyvinyl chloride composite processing aids prepared in examples 1-3 and comparative examples 1-2 were uniformly mixed with polyvinyl chloride resin according to the following formulation in parts by weight:
100 parts of polyvinyl chloride resin, 5 parts of polyvinyl chloride composite processing aid and 5 parts of nano calcium carbonate with the particle size of 500 nm;
then placing the test pieces in a high-speed mixer for high-speed mixing, carrying out melt extrusion, discharging and cooling to prepare a test sample, cutting the test sample into test pieces with the size of 2cm multiplied by 2cm, placing the test pieces in an oven with the temperature of 185 ℃ for heat aging test, taking out the test pieces every 10min for observation, recording whether the test pieces turn black, taking out the test pieces until the last test piece turns black if the test pieces turn black, and recording the results as follows:
from the above results, it is clear that the long-term thermal stability of polyvinyl chloride can be improved by adding a synergist in the preparation of a polyvinyl chloride composite processing aid.
Meanwhile, the melt index, the initial discoloration time (Congo red method), the notched impact strength at 23 ℃, the notched impact strength at-15 ℃ and the light transmittance of the test specimen were tested, and the test results were as follows:
from the above results, it is known that the processing fluidity of polyvinyl chloride can be improved by adding a synergist in the preparation of a polyvinyl chloride composite processing aid; the initial colorability of the polyvinyl chloride can be improved by adding the modified silica sol in the step of preparing the auxiliary stabilizer; the impact resistance of the polyvinyl chloride can be improved by adding a synergist in the preparation of the polyvinyl chloride composite processing aid; the low-temperature toughness of the polyvinyl chloride can be improved by adding the modified silica sol in the step of preparing the auxiliary stabilizer and adding the synergist in the preparation of the polyvinyl chloride composite processing aid; the transparency of polyvinyl chloride can be improved by adding the modified silica sol in the step of preparing the auxiliary stabilizer.
Test example 2
The polyvinyl chloride composite processing aids prepared in examples 1-3 and comparative examples 1-2 were uniformly mixed with polyvinyl chloride resin according to the following formulation in parts by weight:
100 parts of polyvinyl chloride resin, 5 parts of polyvinyl chloride composite processing aid and 5 parts of nano calcium carbonate with the particle size of 500 nm;
then placing the test pieces in a high-speed mixer for high-speed mixing, carrying out melt extrusion, discharging and cooling to prepare a test sample, cutting the test sample into test pieces with the mass fraction of 5cm multiplied by 5cm, weighing the test pieces respectively to obtain initial weights, then completely soaking the test pieces in a sulfuric acid aqueous solution with the mass fraction of 30%, standing for 100 days at 30 ℃, taking out, wiping, weighing the test pieces respectively to obtain weights after acid treatment, and then calculating the mass loss rate after the acid treatment, wherein the calculation formula and the result are as follows:
mass loss rate after acid treatment= (initial weight-weight after acid treatment)/initial weight×100%
Test example 3
The polyvinyl chloride composite processing aids prepared in examples 1-3 and comparative examples 1-2 were uniformly mixed with polyvinyl chloride resin according to the following formulation in parts by weight:
100 parts of polyvinyl chloride resin, 5 parts of polyvinyl chloride composite processing aid and 5 parts of nano calcium carbonate with the particle size of 500 nm;
then placing the test pieces in a high-speed mixer for high-speed mixing, carrying out melt extrusion, discharging and cooling to prepare a test sample, cutting the test sample into test pieces with the mass fraction of 5cm multiplied by 5cm, weighing the test pieces respectively to obtain initial weights, completely soaking the test pieces in 30% sodium hydroxide aqueous solution, standing at 30 ℃ for 100 days, taking out, wiping off, weighing the test pieces respectively to obtain weights after alkali treatment, and calculating the mass loss rate after alkali treatment, wherein the calculation formula and the result are as follows:
mass loss rate after alkali treatment= (initial weight-weight after alkali treatment)/initial weight×100%
From the results of test example 2 and test example 3, it was found that the chemical stability of polyvinyl chloride can be improved by adding the modified silica sol in the step of preparing the auxiliary stabilizer.
The percentages used in the present invention are mass percentages unless otherwise indicated.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The preparation method of the polyvinyl chloride composite processing aid is characterized by comprising the following steps of: preparing a main stabilizer, preparing an auxiliary stabilizer, preparing a synergist and mixing;
the preparation auxiliary stabilizer is prepared by adding epoxidized soybean oil, pentaerythritol, hydrotalcite and modified silica sol into a reaction kettle, and stirring to obtain the auxiliary stabilizer;
the preparation method of the modified silica sol comprises the following steps: adding silica sol into a reaction kettle, adjusting the pH of the silica sol to 7.5-8 by using a hydrochloric acid aqueous solution, then adding a silane coupling agent KH-550 and a titanate coupling agent NDZ-401 into the reaction kettle, stirring, adding chitosan oligosaccharide, and continuously stirring to obtain modified silica sol;
the preparation synergist is prepared by placing nano bentonite at 600-650 ℃ for high-temperature treatment for 1.5-2 hours to obtain nano bentonite after high-temperature treatment, adding the nano bentonite after high-temperature treatment, octadecyl dimethyl betaine and deionized water into a high-shear reaction kettle, adding gas phase nano silicon dioxide after high-shear, continuing high-shear, and drying to obtain the synergist.
2. The method for preparing the polyvinyl chloride composite processing aid according to claim 1, wherein the main stabilizer is prepared by mixing calcium stearate, zinc laurate and zinc oxide, performing ball milling for the first time, adding silane coupling agent KH-550, triallyl cyanurate and nano titanium dioxide, performing ball milling for the second time, and obtaining the main stabilizer after the end of the second ball milling.
3. The preparation method of the polyvinyl chloride composite processing aid according to claim 2, wherein in the preparation of the main stabilizer, the weight ratio of calcium stearate, zinc laurate, zinc oxide, silane coupling agent KH-550, triallyl cyanurate and nano titanium dioxide is 30-35:40-45:10-12:4-6:1-1.5:1-1.5:3-5;
in the preparation of the main stabilizer, the particle size of the nano titanium dioxide is 20-50nm.
4. The method for preparing the polyvinyl chloride composite processing aid according to claim 1, wherein the weight ratio of epoxidized soybean oil, pentaerythritol, hydrotalcite and modified silica sol in the auxiliary stabilizer is 10-15:20-25:4-6:5-8.
5. The preparation method of the polyvinyl chloride composite processing aid according to claim 1, wherein in the preparation of the modified silica sol, the weight ratio of the silica sol to the silane coupling agent KH-550 to the titanate coupling agent NDZ-401 to the chitosan oligosaccharide is 50-60:2-3:1-2:2-4;
in the preparation of the modified silica sol, the pH value of the silica sol is 9-10, the content of silicon dioxide is 28-32%, and the particle size of the silicon dioxide is 10-20nm.
6. The method for preparing the polyvinyl chloride composite processing aid according to claim 1, wherein in the preparation synergist, the weight ratio of the nano bentonite after high-temperature treatment to the octadecyl dimethyl betaine to the deionized water to the gas phase nano silicon dioxide is 50-55:10-12:180-190:3-5.
7. The method for preparing a polyvinyl chloride composite processing aid according to claim 1, wherein in the preparation synergist, the particle size of the nano bentonite is 50-80nm;
in the preparation synergist, the particle size of the gas phase nano silicon dioxide is 30-50nm.
8. The method for preparing the polyvinyl chloride composite processing aid according to claim 1, wherein the main stabilizer, the auxiliary stabilizer and the synergist are added into a reaction kettle and stirred to obtain the polyvinyl chloride composite processing aid.
9. The method for preparing a polyvinyl chloride composite processing aid according to claim 8, wherein in the mixing, the weight ratio of the main stabilizer to the auxiliary stabilizer to the synergist is 40-50:20-25:8-10:12-15.
10. A polyvinyl chloride composite processing aid prepared by the preparation method of any one of claims 1 to 9.
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Cited By (1)
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| CN116496593A (en) * | 2023-06-27 | 2023-07-28 | 山东东临新材料股份有限公司 | Polyvinyl chloride composite processing aid and preparation method thereof |
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