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Granular vinyl chloride resin for paste processing and process for producing same

A polyvinyl chloride resin and polyvinyl chloride paste technology, applied in chemical instruments and methods, screens, grids, etc., can solve the problems of reduced classification speed, increased equipment costs, and reduced quality of resin dispersions

Inactive Publication Date: 2001-04-18
新第一氯乙烯株式会社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method also has the following problems: since the spray drying is performed at low temperature, the productivity of the drying equipment is low and the formation of large-sized aggregates due to the rupture of the resin layer adhering to the inner surface of the drying equipment during long-term operation Incorporation into products to degrade the quality of the resin dispersion forming the plastisol
Considering the fluctuation of classification speed, it is also necessary to limit the amount of powder supply below the maximum amount that the sieve can handle. For this reason, it is necessary to increase the number of ultrasonic vibrating screens and thus increase the cost of equipment
[0008] When the powder classification is carried out continuously, the fine particles in the powder to be classified will adhere to the wire of the sieve and the attached powder particles will gradually grow, therefore, the classification speed will decrease with time, and Make continuous grading difficult

Method used

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  • Granular vinyl chloride resin for paste processing and process for producing same
  • Granular vinyl chloride resin for paste processing and process for producing same
  • Granular vinyl chloride resin for paste processing and process for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] 100 parts by weight of polyvinyl chloride resin containing 92 (weight)% of particle components with a mode particle size of 1.2 microns and 8 (weight)% of particles with a mode particle size of 0.2 microns and 1 ( weight) parts sodium dodecylbenzene sulfonate, according to the method for inoculating emulsion polymerization to make the polyvinyl chloride resin aqueous dispersion that solid content concentration is 46 (weight)%. A spray drying tower equipped with a turntable atomizer (210mm in diameter and 15,000rpm in rotation speed) is used. The absolute humidity of the heated air is 0.01 kg of water / kg of air, the air inlet temperature is 130°C, and the outlet temperature is 55°C. The aqueous dispersion was spray-dried under the condition of ℃. The granular powder obtained by spray drying has a vibration frequency of 36 kHz, an ultrasonic power (maximum power of 200 watts) output of 70%, and a low-speed vibration motor (output of 0.75 kilowatts, frequency of 1400 Hz) a...

Embodiment 2

[0096] The granular powder obtained by polymerizing and drying in the same steps as in Example 1 was classified by the steps in Example 1 (except that the low-speed vibrating motor was not running) with an ultrasonic vibrating sieve. Because the low-speed vibrating motor stops running, the powder that has passed through the sieve will accumulate under the vibrating sieve, so the time required for classification is about 20 times that of Example 1.

[0097] The water content of the polyvinyl chloride resin granule that is used for making paste is 0.5 (weight) %, and average particle diameter is 40.0 microns, and the particle content of particle diameter less than 10 microns is 8.1 (weight). )%, and the content of particles with a particle size greater than 149 microns is 0.0010 (weight)%. The bulk density (loose) is 0.550 g / cm 3 , the angle of repose is 34 degrees. In the powder adhesion test, no powder was found to adhere to the horizontal straight pipe. In the dispersibili...

Embodiment 3

[0112] Aqueous dispersions of polyvinyl chloride resins prepared according to microsuspension polymerization, with a mode particle size (calculated by weight) of 1.8 microns and a particle size distribution width of 0.2-6 microns (solid component concentration of 48 (weight) %) carry out spray drying according to the following steps: the dispersion is sprayed with the rotating speed of 19200rpm by the rotating disc type atomizer (diameter 210 millimeters); Adopt absolute humidity to be 0.01 kilogram water / kg air, be heated to 170 The air at °C is passed from the top of the tower to the bottom of the tower in parallel with the dispersion; and the outlet temperature at the bottom of the tower is adjusted to 55 °C. The bulk density (loose) of the resin granular powder obtained after drying is 0.51 g / cubic centimeter, the angle of repose is 40 ± 1 degree, and the particle size is 109 microns or more than 109 microns. The particle content is 0.5 (weight )% and particles with a part...

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Abstract

A granular vinyl chloride resin for paste processing which has a content of particles having a diameter of 10 um or smaller of 10 wt.% or lower, a content of particles not passing through a 149 um standard sieve of below 0.5 wt.%, and a bulk density of 0.45 to 0.58 g / cm<3> and which, when mixed in an amount of 100 g with 50 g of dioctyl phthalate, gives a plastic sol in which the content of particles not passing through a 62 um standard sieve of below 0.3 wt.%; and a process for producing the granular vinyl chloride resin for paste processing, characterized by polymerizing vinyl chloride or a mixture thereof with a copolymerizable monomer by emulsion polymerization or microsuspension polymerization to give an aqueous dispersion of a vinyl chloride polymer, spray-drying the dispersion to obtain particles, and treating the particles with an ultrasonic oscillating sieve having an opening size of 149 um or smaller to remove the particles remaining on the sieve.

Description

Technical field [0001] The present invention relates to polyvinyl chloride resin pellets for use in the preparation of polyvinyl chloride pastes and a method for producing the pellets. In particular, the present invention relates to polyvinyl chloride resin pellets for the production of polyvinyl chloride pastes prepared from aqueous dispersions of vinyl chloride polymers obtained by emulsion polymerization or microsuspension polymerization, and to a process for producing the pellets, wherein The granule does not have obvious powder adhesion phenomenon and has excellent powder fluidity, and can be well dispersed in plasticizer when preparing paste (plasticized paste). Background technique [0002] In order to prepare polyvinyl chloride resin for paste, it is usually prepared by emulsion polymerization or microsuspension polymerization using vinyl chloride or a mixture containing vinyl chloride as the main component and a comonomer that can be copolymerized with vinyl chlorid...

Claims

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Application Information

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IPC IPC(8): C08J3/12C08J3/18
CPCC08J2327/06C08J3/18C08J3/122C08F14/06
Inventor 中村荣太郎滝泽忠牧野学小濑智之长友义满
Owner 新第一氯乙烯株式会社
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