Dispersion stabilizer for suspension polymerization of vinyl compound, and method for production of vinyl compound polymer
A technology of dispersion stabilizer, suspension polymerization, used in chemical instruments and methods, chemical/physical processes, transportation and packaging, etc.
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preparation example Construction
[0029] The method for preparing the dispersion stabilizer of the present invention is not particularly limited, for example, it can be prepared by the method for preparing the dispersion stabilizer shown below.
[0030] [Preparation method of dispersion stabilizer]
[0031] The dispersion stabilizer of the present invention can be prepared, for example, by saponifying carbon monoxide-vinyl ester copolymers (CO-modified PVEs) containing vinyl ester units and CO units. CO-modified PVEs were changed into CO-modified PVA by saponifying vinyl ester units into vinyl alcohol units. During saponification, the structure adjacent to the CO unit in CO-modified PVEs changes to form an enone structure through decarboxylation and / or dehydration reactions. When the vinyl ester unit is a vinyl acetate unit, the decarboxylation reaction is a deacetate reaction.
[0032] A part of the enone structure formed by saponification is further dehydrated to a diene structure, a triene structure, etc....
Embodiment
[0058] Hereinafter, the present invention will be described in more detail by way of examples and comparative examples. The present invention is not limited to the following examples. "Parts" and "%" in the following examples are based on weight unless otherwise specified.
[0059] In this example, the CO-modified PVA obtained in the following Preparation Examples (wherein Preparation Example 17 is unmodified PVA) was used as a dispersion stabilizer to suspend polymerization of vinyl chloride monomers, and the vinyl chloride polymerization formed by this polymerization was evaluated. The particle size distribution of the particles (vinyl chloride particles) and the amount of scale attached to the polymerization vessel during suspension polymerization.
[0060] (1) Evaluation of particle size distribution of vinyl chloride particles
[0061] The vinyl chloride particles formed by suspension polymerization were sieved with a JIS standard sieve, and the particles that did not p...
preparation example 1
[0069] (Preparation Example 1: Preparation of PVA1)
[0070] Add 275 g of vinyl acetate monomer, 225 g of methanol, and 10 mg of tartaric acid into a pressurized reaction tank with an inner volume of 1 L having a stirrer, a nitrogen gas inlet, a CO inlet, and a polymerization initiator addition port, and heat the contents to 60°C , Nitrogen was introduced into the reaction system for 30 minutes to replace nitrogen. Next, CO was introduced into the reaction system for 30 minutes to replace CO in the reaction system, and then CO was introduced so that the pressure in the reaction tank became 1.0 MPa, and then 2,2'-azobis as a polymerization initiator was injected into the tank. 0.25 g of isobutyronitrile (AIBN) initiates the copolymerization of vinyl acetate monomer and CO. During the polymerization, the pressure in the reaction tank was maintained at 1.0 MPa by pressurizing CO, and the polymerization temperature was maintained at 60°C. After two hours from the start of polyme...
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Abstract
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