Method for preparing stratiform hydrotalcite PVC (Poly Vinyl Chloride) heat stabilizer by using rotary liquid membrane reactor

A thermal stabilizer, hydrotalcite technology, applied in chemical instruments and methods, aluminum compounds, inorganic chemistry, etc., can solve the influence of particle size and uniform dispersion performance of synthetic hydrotalcite, concentration gradient, slow reaction speed and diffusion speed, and limitations. The application of layered hydrotalcite thermal stabilizer, etc., to achieve the effect of increasing the collision reaction efficiency, narrow grain size distribution, and fine grain size

Active Publication Date: 2012-08-15
青海西部镁业新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The co-precipitation method is the most commonly used method for preparing layered composite metal hydroxides. The equipment used is generally a conventional tank reactor. Due to the mixing of the salt solution and the alkali solution in the reactor, the stirring method is realized. Mixing Very insufficient, the reaction interface is small, there is a concentration gradient, the reaction speed and the diffusion speed are slow, so new precipitated particles are formed on the first precipitated particles, and the new and old particles exist at the same time, resulting in uneven particle size distribution
The particle size and uniform dispersion performance of synthetic hydrotalcite are greatly affected, and its crystal size is difficult to reach the nanometer level, which greatly limits the application of layered hydrotalcite heat stabilizers

Method used

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  • Method for preparing stratiform hydrotalcite PVC (Poly Vinyl Chloride) heat stabilizer by using rotary liquid membrane reactor
  • Method for preparing stratiform hydrotalcite PVC (Poly Vinyl Chloride) heat stabilizer by using rotary liquid membrane reactor
  • Method for preparing stratiform hydrotalcite PVC (Poly Vinyl Chloride) heat stabilizer by using rotary liquid membrane reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as figure 1The rotating liquid film reactor shown has a closed casing as the stator, and the upper end of the stator is closed; there is a rotatable conical rotor inside the stator, and the motor is connected to the bottom of the rotor; the rotor consists of an upper cone, a middle cone and a bottom cylinder. Composed of three parts, these three parts are composed of three separate parts; the cone angle of the upper cone is 45 degrees, the height is 6cm, the distance between the top surface and the upper casing of the stator is 1.5cm, and the bottom surface is connected with the middle cone ; The cone angle of the middle cone is 65 degrees, the height is 9cm, its top surface is connected with the upper cone, and the cross-sectional area of ​​the joint is the same, and its bottom surface is connected with the bottom cylinder; the bottom cylinder section is connected with the middle cone The size of the bottom surface is the same, the diameter is 10cm, and the height...

Embodiment 2

[0036] Such as figure 1 The rotating liquid film reactor shown has a closed casing as the stator, and the upper end of the stator is closed; there is a rotatable conical rotor inside the stator, and the motor is connected to the bottom of the rotor; the rotor consists of an upper cone, a middle cone and a bottom cylinder. Composed of three parts, these three parts are combined by three separate parts or processed as a whole; the cone angle of the upper vertebral body is 55 degrees, the height is 8cm, the distance between the top surface and the upper shell of the stator is 2cm, and the bottom surface and the middle part The cones are connected; the cone angle of the middle cone is 75 degrees, and the height is 10cm. The same size as the bottom surface of the middle cone, with a diameter of 50cm and a height of 5cm; two feed ports are symmetrically arranged between the upper cone of the rotor and the stator, and the feed ports are lower than the upper edge of the upper cone of ...

Embodiment 3

[0042] Adopt the rotating liquid film reactor of embodiment 1 to prepare layered hydrotalcite PVC thermal stabilizer, its concrete steps are:

[0043] Mg(NO 3 ) 2 , Zn(NO 3 ) 2 and Al(NO 3 ) 3 by Mg 2+ / Zn 2+ / Al 3+ =3:1:2 molar ratio is made into mixed salt solution, wherein [Mg 2+ +Zn 2+ ]=1.4mol / L; NaOH and Na 2 CO 3 Dissolve in deionized water to form a mixed alkali solution of the same volume, where n(NaOH) / [n(Mg 2+ )+n(Al 3+ )]=2.4, n(Na 2 CO 3 ) / n(Mg 2+ )=1.6; The two solutions are added to the reactor through two feeding ports of the rotary liquid film reactor respectively at a flow rate of 8kg / min, the slit of the reactor is 30 μm, and the rotor speed is 3000rpm, and the slurry obtained by the reaction is crystallized Crystallize in a kettle at 150°C for 3 hours, filter, wash, and dry to obtain a layered hydrotalcite PVC heat stabilizer, whose chemical formula is Mg 3 ZnAl 2 (OH) 12 (CO 3 )·4H 2 O. The average particle size of the product is 100n...

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Abstract

The invention provides a rotary liquid membrane reactor, belonging to the technical field of an inorganic functional material and used for preparing the stratiform hydrotalcite PVC heat stabilizer. Starting from a basic technique of a coprecipitation method and based on a crystal chemical principle, the invention designs the rotary liquid membrane reactor through calculation and analysis of fluid mechanics, so that two fluids flow in a turbulence manner within a confinement space. Therefore, the supersaturation degree is uniform, the nucleation rate of a system is improved, and the crystallization generation rate is reduced; alamellar hydrotalcite PVC heat stabilizer with smaller grain size and narrower grain size distribution is obtained. The grain size of the product can be controlled within a range of 10-150 nm, and the size distribution range can be reduced to 20-50 nm.

Description

Technical field: [0001] The invention belongs to the technical field of preparation of inorganic functional materials, in particular to a rotary liquid film reactor and its use in the preparation of layered hydrotalcite PVC heat stabilizer. Background technique: [0002] Hydrotalcite, also known as layered double hydroxides (LDHs for short), is a typical anionic layered material. Since the laminates of hydrotalcite are alkaline, they can absorb the HCl released by the pyrolysis of PVC, and the interlayer ions can interact with Cl - Exchange, so as to achieve the role of absorbing HCl and stabilizing PVC. The layered hydrotalcite used as a PVC heat stabilizer is generally a carbonate-type hydrotalcite containing magnesium, aluminum, and zinc in the laminate, and its general formula is Mg 1-x-y Zn x al y (OH) 2 (CO 3 ) y / 2 mH 2 O. [0003] In order to exert a better thermal stabilization effect, the layered hydrotalcite heat stabilizer needs to have a smaller particle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/00C01F7/00C08L27/06C08K3/26
Inventor 林彦军李殿卿李峰段雪
Owner 青海西部镁业新材料有限公司
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