CN111875847B - High-dispersion 4A zeolite, and preparation method and application thereof - Google Patents
High-dispersion 4A zeolite, and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a high-dispersion 4A zeolite, a preparation method and an application thereof, wherein the high-dispersion 4A zeolite comprises the following raw materials: 4A zeolite and a dispersant; the dispersant is at least one of the following: inorganic phosphate, organic matter; the mass ratio of the 4A zeolite to the dispersing agent is 250-500: 1. The method can be used for preparing the high-dispersion 4A zeolite, can be used for producing the 4A zeolite and the high-dispersion 4A zeolite by utilizing the original production line, and has the advantages of low investment, high efficiency, simple method and easy industrialization.
Description
Technical Field
The invention belongs to the technical field of preparation of 4A zeolite, and particularly relates to high-dispersion 4A zeolite, and a preparation method and application thereof.
Background
The 4A zeolite is a white powder which is nontoxic, odorless, tasteless and good in fluidity and is known as sodium aluminosilicate. The 4A zeolite has the characteristics of cation exchange performance, large specific surface area, good adsorption performance and the like, and the 4A zeolite is applied to catalytic materials, wastewater treatment and other aspects. In recent years, it has been reported that 4A zeolite is filled with PP and PE as barrier materials to improve the flame retardant property. The 4A zeolite has the property of absorbing HCl, and the thermal stability effect of the calcium and zinc composite stabilizer can be improved by using the 4A zeolite as a PVC thermal stabilizer.
Most of the existing 4A zeolite products are synthesized by a wet method, the 4A zeolite produced by the method is easy to agglomerate and has poor dispersibility, the existence of the agglomerated particles influences the acid absorption capacity of the 4A zeolite, the stability effect of the PVC heat stabilizer is greatly fluctuated, and the surface smoothness of the PVC products is reduced.
The patent application with application publication No. CN102502693A discloses a method for synthesizing large-grain and high-dispersion 4A zeolite, which adopts sodium chlorate solution, sodium silicate solution, ionic membrane liquid alkali and water as raw materials to obtain the 4A zeolite with good grain large dispersion through the processes of gelatinizing, two-stage crystallizing, washing and drying, particularly two-stage crystallizing. Patent application publication No. CN101920974A discloses a method for improving dispersibility of zeolite and reducing average particle size of zeolite, under the action of ultrasonic wave and alkali, binding amorphous components to zeolite particles is separated, and alkali liquor can dissolve part of silicon on the surface of zeolite to form fine grooves on the surface of zeolite. The dissolved silicon is washed clean by water to clean the surface of the zeolite, so that when the zeolite particles are contacted with each other, a layer of air film exists among the zeolite particles, thereby effectively preventing electrostatic force and capillary action and preventing the re-agglomeration of dispersed particles.
The method for improving the dispersibility of the zeolite has high cost and is difficult to produce in a large scale, and a new means for improving the dispersibility of the 4A zeolite is urgently needed at present, so that the dispersibility of the zeolite can be improved, and the industrial production can be easily realized.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides high-dispersion 4A zeolite, a preparation method and application thereof, and aims to solve the problems that the 4A zeolite in the prior art has poor dispersibility and poor acid absorption capability due to easy agglomeration, so that the stability effect of a PVC heat stabilizer fluctuates greatly, and the surface smoothness of a PVC product is reduced.
The invention realizes the purpose through the following technical scheme:
in one aspect, an embodiment of the present invention provides a high-dispersion 4A zeolite, including the following raw materials:
4A zeolite and a dispersant;
the dispersant is at least one of the following: inorganic phosphate, organic matter;
the mass ratio of the 4A zeolite to the dispersing agent is 250-500: 1.
Further, the mass ratio of the 4A zeolite to the dispersing agent is 300-400: 1.
further, the inorganic phosphate is at least one of: sodium hexametaphosphate, sodium pyrophosphate;
further, the organic matter is at least one of: polyethylene glycol, polyacrylamide.
Further, when the dispersing agent is a mixture of inorganic phosphate and organic matter, the mass ratio of the inorganic phosphate to the organic matter is 1-3.5: 1.
Further, the mass ratio of the inorganic phosphate to the organic matter is 1.5-2.34: 1.
further, D of the 4A zeolite503.0 to 4.0 μm, D995.2 to 6.0 μm.
In a second aspect, the present invention provides a process for preparing a highly dispersed 4A zeolite, the process comprising,
mixing and dispersing the 4A zeolite and a dispersing agent according to the mass ratio, and coating the surface of the 4A zeolite with the dispersing agent to obtain high-dispersion 4A zeolite;
the dispersant is at least one of the following: inorganic phosphate, organic matter;
further, in the mechanical dispersion, the rotating speed is 500-600 r/min, the mechanical dispersion temperature is 30-150 ℃, and the mechanical dispersion time is 10-60 s.
In a third aspect, the embodiment of the invention provides that the high-dispersion 4A zeolite is used as a PVC heat stabilizer.
The beneficial effects of the invention at least comprise:
the invention provides a high-dispersion 4A zeolite, a preparation method and an application thereof, wherein the high-dispersion 4A zeolite comprises the following raw materials: 4A zeolite and a dispersant; the dispersant is at least one of the following: inorganic phosphate, organic matter; the mass ratio of the 4A zeolite to the dispersing agent is 250-500: 1. The inside of the structure of the high-dispersion 4A zeolite is the 4A zeolite, and the dispersant coats or forms an electric double layer on the surface of 4A zeolite particles, so that the 4A zeolite particles are not agglomerated any more, and the dispersibility of the 4A zeolite is improved. The high-dispersion 4A zeolite has good acid absorption capacity, good effect as a PVC heat stabilizer and good smoothness of PVC products.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is an electron micrograph of a highly dispersed 4A zeolite which is used in an embodiment of the present invention;
FIG. 2 is an electron micrograph of zeolite 4A;
figure 3 is a thermal stability graph of PVC after application of 4A zeolite and highly dispersed 4A zeolite of the present invention to PVC.
In fig. 3, numerals 20, 33, 46, 59, 72, 85, 98, 111, 124, 137, 150, 163 represent the number of heating minutes.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically indicated, various raw materials, reagents, instruments, equipment and the like used in the present invention may be commercially available or may be prepared by existing methods.
In order to solve the technical problems, the technical scheme in the embodiment of the invention has the following general idea:
in a first aspect, embodiments of the present invention provide a highly dispersed 4A zeolite, where the highly dispersed 4A zeolite comprises the following components:
4A zeolite and a dispersant;
the dispersant is at least one of the following: inorganic phosphate, organic matter;
the mass ratio of the 4A zeolite to the dispersing agent is 250-500: 1.
The addition amount of the dispersing agent is not too high, too much dispersing agent wastes, too little dispersing agent cannot disperse the agglomerated particles on the surface of the 4A zeolite, and the effect of improving the dispersibility cannot be achieved.
Further, the mass ratio of the 4A zeolite to the dispersing agent is 300-400: 1.
when the ratio of the 4A zeolite to the dispersant is within this range, the highly dispersed 4A zeolite can have a smaller particle size, and hence a better dispersing effect can be obtained.
Further, the inorganic phosphate is at least one of: sodium hexametaphosphate, sodium pyrophosphate.
Further, the organic matter is at least one of: polyethylene glycol, polyacrylamide.
Further, when the dispersing agent is a mixture of inorganic phosphate and organic matter, the mass ratio of the inorganic phosphate to the organic matter is 1-3.5: 1.
Further, the mass ratio of the inorganic phosphate to the organic matter is 1.5-2.34: 1.
when the organic matter and the inorganic phosphate are mixed for use, because the difference of the chemical properties of the organic matter and the inorganic phosphate is large, the organic matter is coated preferentially in the coating process of the 4A zeolite particles, if the proportion of the organic matter is large, the coating effect of the inorganic phosphate is difficult to embody, and the coating has adverse effect on the practical application of later-stage PVC; the proper amount of added organic matter can improve the compatibility of the high-dispersion 4A zeolite with organic matter when in application. The ratio of the organic matter to the inorganic phosphate is affected by the ratio of the highly dispersed 4A zeolite to PVC.
Further, D of the 4A zeolite503.0 to 4.0 μm, D of the 4A zeolite995.2 to 6.0 μm.
For 4A zeolite with large particle size, a mechanical dispersion method is generally adopted to further reduce the particle size, and the method is simple, good in effect and low in cost. For 4A zeolite (3.0-4.0 μm) with a very small particle size, it is difficult to further disperse under mechanical dispersion because of electrostatic adsorption and van der Waals forces between particles. After inorganic phosphate and 4A zeolite are mixed, during dispersion, the dispersing agent disperses agglomerated particles on the surface of the 4A zeolite, and the agglomerated particles become small; meanwhile, the dispersing agent can coat the surfaces of the 4A zeolite particles or form an electric double layer, so that the dispersed 4A zeolite particles are not agglomerated any more, and the dispersibility of the 4A zeolite is improved. Fig. 1 is an electron micrograph of a highly dispersed 4A zeolite according to an embodiment of the present invention, and fig. 2 is an electron micrograph of a 4A zeolite, and it can be seen from fig. 1 and 2 that the agglomerate grains on the surface of the highly dispersed 4A zeolite are smaller than the agglomerate grains on the surface of the 4A zeolite. The 4A zeolite can be a 4A zeolite produced by existing production processes, such as: the hydrothermal synthesis method is to prepare zeolite slurry by using an aluminum source and a silicon source, and to obtain the zeolite by washing and drying.
In this application, D50For example, D50 is 3.05 μm, and the median particle size of 4A zeolite is more than 50% of 4A zeolite having a particle size of 3.05 μm or more, and 50% of 4A zeolite having a particle size of 3.05 μm or less. D99 was 5.233 μm, and showed that the content of 4A zeolite having a particle size of less than 5.233 μm was 99%, and the content of 4A zeolite having a particle size of more than 5.233 μm was 1%.
In a second aspect, embodiments of the present invention provide a method for preparing a highly dispersed 4A zeolite, the method comprising,
mixing and dispersing the 4A zeolite and a dispersing agent according to the mass ratio, and coating the surface of the 4A zeolite with the dispersing agent to obtain high-dispersion 4A zeolite;
the dispersant is at least one of the following: inorganic phosphate and organic matter.
Further, the dispersion may be performed in a dispersion apparatus including, but not limited to, any of: mechanical mill, universal mill and vertical pulverizer. The mechanical dispersion can be carried out in any conventional equipment, under the rotating speed provided by the dispersing equipment, the materials entering the dispersing equipment generate strong turbulence, and the 4A zeolite particles are rubbed and collided under the action of the turbulence and combined with inorganic phosphate and organic matters to complete the dispersing action. The dispersion may also be implemented in any other device or method that can function as a dispersion.
Further, in the dispersing process, the rotating speed is 500-600 r/min, the mechanical dispersing temperature is 30-150 ℃, and the mechanical dispersing time is 10-60 s. The mechanical dispersion time is too short and some of the large particles cannot be completely dispersed. During mechanical dispersion, the 4A zeolite is continuously rubbed and collided, so that friction generates heat, and the heat can increase the dispersion temperature and improve the coating effect.
In a third aspect, the embodiment of the invention provides that the high-dispersion 4A zeolite is used as a PVC heat stabilizer.
The invention provides high-dispersion 4A zeolite, a preparation method and application thereof, and the prepared high-dispersion 4A zeolite has small agglomerated particles, good dispersibility and strong acid absorption capacity, so that the effect of a PVC heat stabilizer is stable, and the surface smoothness of a PVC product is reduced. On the basis of the existing 4A zeolite production line, a dispersing agent and dispersing equipment are added between a finished product warehouse and a packaging opening, and the high-dispersion 4A zeolite is obtained by the mechanical mode on the premise of not changing the crystal appearance of the 4A zeolite; meanwhile, the original production line can be utilized to produce the 4A zeolite and the high-dispersity 4A zeolite, so that the investment is low and the efficiency is high; the method is simple and easy to industrialize, and the problems of low efficiency and high cost of preparing the high-dispersion 4A zeolite by using a low-concentration and low-temperature long-time crystallization process are solved.
The highly dispersed 4A zeolite of the present invention, its preparation and use will be further described with reference to the following specific examples.
Example 1
Mixing 33% by mass of polyethylene glycol and 67% by mass of sodium hexametaphosphate, adding the mixed mixture into 4A zeolite, and dispersing in a mechanical mill at the rotation speed of 510r/min to obtain the high-dispersion 4A zeolite. Wherein the mass of the mixture is 2 per mill of the mass of the 4A zeolite.
Example 2
Adding sodium pyrophosphate into 4A zeolite, and dispersing in a universal mill at the rotating speed of 520r/min to obtain the high-dispersion 4A zeolite. Wherein the mass of the sodium pyrophosphate is 2.5 per mill of the mass of the 4A zeolite.
Example 3
Adding sodium hexametaphosphate into the 4A zeolite, and dispersing in a vertical mill at the rotating speed of 530r/min to obtain the high-dispersion 4A zeolite. Wherein the mass of the sodium hexametaphosphate is 3 per mill of the mass of the 4A zeolite.
Example 4
Mixing 35% by mass of polyethylene glycol and 65% by mass of sodium pyrophosphate, adding the mixed mixture into 4A zeolite, and dispersing in a universal mill at a rotation speed of 540r/min to obtain the high-dispersion 4A zeolite. Wherein the mass of the mixture is 3.5 per mill of the mass of the 4A zeolite.
Example 5
Mixing 38% by mass of polyacrylamide and 62% by mass of sodium hexametaphosphate, adding the mixed mixture into 4A zeolite, and dispersing in a vertical mill at the rotation speed of 550r/min to obtain the high-dispersion 4A zeolite. Wherein the mass of the mixture is 4 per mill of the mass of the 4A zeolite.
Example 6
Mixing 30 mass percent of polyacrylamide and 70 mass percent of sodium pyrophosphate, adding the mixed mixture into 4A zeolite, and dispersing in a mechanical mill at the rotating speed of 560r/min to obtain the high-dispersion 4A zeolite. Wherein the mass of the mixture is 2.5 per mill of the mass of the 4A zeolite.
Example 7
Mixing sodium pyrophosphate and sodium hexametaphosphate, adding the mixed mixture into 4A zeolite, and dispersing in a mechanical mill at 570r/min to obtain high-dispersion 4A zeolite. Wherein, in the mixture of sodium pyrophosphate and sodium metaphosphate, the mass percent of sodium pyrophosphate is 30 percent, and the mass percent of sodium hexametaphosphate is 70 percent; the mixture was 3% by mass of 4A zeolite.
Example 8
Mixing polyethylene glycol and polyacrylamide, adding the mixed mixture into 4A zeolite, and dispersing in a mechanical mill at the rotating speed of 580r/min to obtain the high-dispersion 4A zeolite. Wherein, in the mixture of polyethylene glycol and polyacrylamide, the mass percent of the polyethylene glycol is 65 percent, and the mass percent of the polyacrylamide is 35 percent; the mass of the mixture is 3.5 per mill of the mass of the 4A zeolite.
Example 9
This example was carried out in the same manner as in example 1 except that 47% by mass of polyethylene glycol and 53% by mass of sodium hexametaphosphate were mixed in the same manner as in example 1 with reference to example 1.
Example 10
The present example was conducted in the same manner as in example 6 except that 24% by mass of polyacrylamide and 76% by mass of sodium pyrophosphate were mixed in comparison with example 6.
Example 11
Mixing polyacrylamide and polyethylene glycol in a mass ratio of 1:1, mixing the mixed mixture and sodium pyrophosphate in a mass ratio of 3:7, adding the mixture into 4A zeolite, and dispersing in a mechanical mill at a rotation speed of 600r/min to obtain the high-dispersion 4A zeolite. Wherein the mass of the mixture consisting of polyacrylamide, polyethylene glycol and sodium pyrophosphate is 3.3 per mill of the mass of the 4A zeolite.
Example 12
Mixing sodium pyrophosphate and sodium hexametaphosphate in a mass ratio of 1:1, mixing the mixed mixture and polyethylene glycol in a mass ratio of 7:3, adding the mixture into 4A zeolite, and dispersing in a mechanical mill at a rotation speed of 600r/min to obtain the high-dispersion 4A zeolite. Wherein the mass of the mixture consisting of the sodium pyrophosphate, the sodium hexametaphosphate and the polyethylene glycol is 2.7 per mill of the mass of the 4A zeolite.
Example 13
Mixing sodium pyrophosphate and sodium hexametaphosphate in a mass ratio of 1:2, mixing polyacrylamide and polyethylene glycol in a mass ratio of 1:2, mixing the mixed inorganic phosphate and the mixed organic matter in a mass ratio of 3:2, adding the mixture into 4A zeolite, and dispersing in a mechanical mill at a rotation speed of 600r/min to obtain the high-dispersion 4A zeolite. Wherein the mass of the mixture consisting of the sodium pyrophosphate, the sodium hexametaphosphate, the polyacrylamide and the polyethylene glycol is 3.1 per mill of the mass of the 4A zeolite.
Example 14
Adding polyethylene glycol into 4A zeolite, and dispersing in a vertical mill for 40 seconds at a rotation speed of 600r/min and a temperature of 70 ℃ to obtain the high-dispersion 4A zeolite. Wherein the mass of the sodium hexametaphosphate is 3 per mill of the mass of the 4A zeolite.
Example 15
Adding polyacrylamide into 4A zeolite, and dispersing in a vertical mill for 40 seconds at the rotation speed of 530r/min and the temperature of 60 ℃ to obtain the high-dispersion 4A zeolite. Wherein the mass of the polyacrylamide is 3 per mill of the mass of the 4A zeolite.
Example 16
The present example was conducted in the same manner as in example 15 except that the mass of polyacrylamide was 3.8% o by mass of the 4A zeolite in example 15.
Example 17
In this example, the mass of polyacrylamide is 2.1 ‰ of the mass of zeolite 4A, which is different from example 15, with reference to example 15.
Comparative example 1
Sodium silicate is not the dispersant as claimed in this application and in comparative example 1, reference is made to example 3, replacing sodium hexametaphosphate with sodium silicate.
Comparative example 2
Sodium silicate is not a dispersant as claimed in the present application, and in order to investigate the effect when the mass ratio of 4A zeolite and sodium silicate exceeds the maximum mass ratio of 500:1 in the present application, in comparative example 2, sodium hexametaphosphate was replaced with sodium silicate with reference to example 3, and sodium silicate was added in an amount of 7% o by mass of 4A zeolite.
Comparative example 3
Sodium silicate is not a dispersant as claimed in the present application, and in order to investigate the effect when the mass ratio of the 4A zeolite to the sodium silicate is less than the minimum mass ratio of 250:1 in the present application, in comparative example 2, with reference to example 3, sodium hexametaphosphate was replaced with sodium silicate, which was added in an amount of 0.5% per mill of the mass of the 4A zeolite.
Comparative example 4
In order to investigate the effect when the mass ratio of the 4A zeolite to the dispersant exceeded 500:1, in comparative example 4, the added mass of sodium pyrophosphate was 7% o by mass of the 4A zeolite, unlike example 2.
Comparative example 5
In comparative example 5, in order to investigate the effect when the mass ratio of the 4A zeolite to the dispersant was less than 250:1, the mass of sodium pyrophosphate was 0.5% o by mass of the 4A zeolite, unlike example 2.
Comparative example 6
Sodium tripolyphosphate was not the dispersant to be protected by this application, and in comparative example 6, sodium pyrophosphate was replaced with sodium tripolyphosphate with reference to example 2 in order to investigate the effect of using the inorganic sodium salt dispersant outside the scope of this application.
Comparative example 7
Sodium polyacrylate is not the dispersant to be protected in the present application, and in order to investigate the effect of using the organic sodium salt dispersant outside the scope of the present application, in comparative example 7, sodium pyrophosphate was replaced with sodium polyacrylate with reference to example 2.
Comparative example 8
Comparative example 8 is the same as example 9 except that the mass percent of polyethylene glycol is 70% and the mass percent of sodium hexametaphosphate is 30% with reference to example 1.
Comparative example 9
Comparative example 9 the same as example 9 except that the weight percent of polyethylene glycol was 15% and the weight percent of sodium hexametaphosphate was 85% was used in example 1 as a reference.
TABLE 1
The particle sizes of the 4A zeolite used and the highly dispersed 4A zeolite prepared in examples 1 to 15, comparative examples 1 to 9 are shown in table 1.
The 4A zeolite and the high-dispersion 4A zeolite are applied to PVC, and the PVC is subjected to heat aging at 200 ℃ in an oil bath, wherein the colors of the PVC under different heating times are shown in figure 3, and the darker the color represents the poorer the heat stability.
From the data in table 1, it can be seen that the D of the highly dispersed 4A zeolite of examples 1 to 1550And D99The particle size ratio of the 4A zeolite is obviously reduced, and the smaller the particle size is, the agglomeration is avoided, so that the good dispersibility is shown. From the metallographic images of fig. 1 and 2, it is also apparent that the agglomerate grains of the highly dispersed 4A zeolite are significantly smaller than the agglomerate grains of the 4A zeolite, and that the highly dispersed 4A zeolite was prepared using the method of the present application. From comparative example 1, it can be seen that a highly dispersed 4A zeolite prepared using sodium silicate as the dispersant is more highly dispersible than D of the present application50And D99Obvious large granularity, low granularity reduction rate and poor dispersion performance; according to comparative examples 2 and 3, sodium silicate was used as a dispersant and its added quality was too high or too low, and highly dispersed 4A zeolite was prepared in comparison with D of the present application50And D99The granularity is larger than that of the application, the reduction rate of the grain diameter is low, and the dispersion performance is poor; according to comparative examples 4 and 5, it was found that the addition quality of the dispersant was too high or too low, and highly dispersed 4A zeolite was prepared in comparison with D of the present application50And D99The granularity is larger than that of the application, the reduction rate of the grain diameter is low, and the dispersion performance is poor; according to comparative examples 6 and 7, the particle size of the high-dispersion 4A zeolite is larger than that of the high-dispersion 4A zeolite, the particle size reduction rate is low, and the dispersibility is poor by using sodium tripolyphosphate and sodium polyacrylate as dispersing agents; according to comparative examples 8 and 9, it is understood that when the dispersant is a mixture of polyethylene glycol and sodium hexametaphosphate, the mass ratio is too large or too small, the highly dispersed 4A zeolite has a larger particle size than that of the present application, the particle size reduction ratio is low, and the dispersibility is poor.
D50Represents the median particle diameter of the 4A zeolite, for example, D50 is 3.05 μm, and represents that the ratio of 4A zeolite having a particle diameter of 3.05 μm or more exceeds50% by weight, and 50% by weight of 4A zeolite having a particle size of 3.05 μm or less. D99 was 5.233 μm, and showed that the content of 4A zeolite having a particle size of less than 5.233 μm was 99%, and the content of 4A zeolite having a particle size of more than 5.233 μm was 1%.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. A high-dispersion 4A zeolite is characterized by comprising the following raw materials:
4A zeolite and a dispersant;
the dispersant is at least one of the following: inorganic phosphate and organic matter, wherein the inorganic phosphate is at least one of the following: sodium hexametaphosphate and sodium pyrophosphate, wherein the organic matter is polyacrylamide;
the mass ratio of the 4A zeolite to the dispersing agent is 250-500: 1;
d of the 4A zeolite503.0 to 4.0 μm, D of the 4A zeolite995.2 to 6.0 μm.
2. The high-dispersion 4A zeolite of claim 1, wherein the mass ratio of the 4A zeolite to the dispersant is 300-400: 1.
3. The highly dispersed 4A zeolite according to claim 1, wherein when the dispersant is an inorganic phosphate and an organic substance, the mass ratio of the inorganic phosphate to the organic substance is 1-3.5: 1.
4. The high-dispersion 4A zeolite according to claim 1, wherein the mass ratio of the inorganic phosphate to the organic matter is 1.5-2.34: 1.
5. a process for preparing a highly dispersed 4A zeolite as claimed in any one of claims 1 to 4, which comprises,
mixing and dispersing the 4A zeolite and a dispersing agent according to the mass ratio, and coating the surface of the 4A zeolite with the dispersing agent to obtain high-dispersion 4A zeolite;
the dispersant is at least one of the following: inorganic phosphate and organic matter.
6. The method of claim 5, wherein the dispersion speed is 500-600 r/min, the dispersion temperature is 30-150 ℃, and the dispersion time is 10-60 s.
7. Use of a highly dispersed 4A zeolite according to any one of claims 1 to 4 as a PVC heat stabilizer.
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| CN105754245A (en) * | 2014-12-13 | 2016-07-13 | 淄博龙沙高分子材料科技有限公司 | Modified molecular sieve heat stabilizer for PVC and preparation method thereof |
| CN106430231A (en) * | 2016-08-16 | 2017-02-22 | 中国铝业股份有限公司 | Zeolite 4A, preparation method and device and application of zeolite 4A, PVC and preparation method of PVC |
| CN107652629A (en) * | 2017-09-27 | 2018-02-02 | 桂林理工大学 | A kind of preparation method of monodisperse mesoporous molecular sieve reinforced epoxy composite |
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2020
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101708879A (en) * | 2009-08-11 | 2010-05-19 | 上海沃杉化工有限公司 | Inorganic-organic composite flocculating agent and preparation method thereof |
| CN102964744A (en) * | 2012-12-10 | 2013-03-13 | 山东慧科助剂股份有限公司 | Thermal stabilizer for aluminate modified molecular sieve PVC and preparation method thereof |
| CN105754245A (en) * | 2014-12-13 | 2016-07-13 | 淄博龙沙高分子材料科技有限公司 | Modified molecular sieve heat stabilizer for PVC and preparation method thereof |
| CN106430231A (en) * | 2016-08-16 | 2017-02-22 | 中国铝业股份有限公司 | Zeolite 4A, preparation method and device and application of zeolite 4A, PVC and preparation method of PVC |
| CN107652629A (en) * | 2017-09-27 | 2018-02-02 | 桂林理工大学 | A kind of preparation method of monodisperse mesoporous molecular sieve reinforced epoxy composite |
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