The invention discloses a production method for polyvinyl chloridepowder for preparing a baffle plate of a lead acid storage battery, and belongs to the field of the emulsionpolymerization method of a vinyl chloridemonomer. The method comprises the following steps of: adding the component materials such as the vinyl chloridemonomer, an initiator, an emulsifier, a pH regulator, desalted water and the like into a polymerization kettle in proportion and performing polymerization on the materials to produce a latex polymer by using the emulsion polymerization method; adding an after-treating agent to process the latex polymer; and performing spray drying on the mixture to obtain the polyvinyl chloridepowder, of which 80 percent has the particle diameter of about 33 mu m so as to ensure that the polymer has proper molecular weight and molecular weight distribution, stable molecular structure, superior powder flowability and high thermal stability. The method solves the problems of the conventional polyvinyl used for producing the baffle plate of the storage battery through the set formula for the materials of the polymerization and process optimization, so the method completely meets the requirement of the standard for producing the polyvinyl chloride powder for the baffle plate of the storage battery and provides the high-quality polyvinyl chloride powder which meets the national standard for the production of the baffle plate of the storage battery.
The present invention provides a vinyl chloridepolymer composition which comprises (i) a vinyl chloridepolymer (a) and (ii) a block copolymer (b) having a polymer block (I) comprising of a block copolymer, which may be hydrogenated, of an aromatic vinyl compound polymer block and a conjugated diene polymer block, and a polymer block (II) of a polyurethane, in a specific weight ratio. The vinyl chloridepolymer composition of the present invention has non-tackiness, excellent handling properties, favorable flexibility and mechanical properties, and favorable melt-adhesiveness to other materials, and shows no migration of the component serving as a plasticizer. The vinyl chloridepolymer composition of the present invention can be applied for various uses such as a production of various molded articles and a production of a laminated structure with other materials.
The present invention relates to a vinyl chloridepolymer and a method for preparing same and, more specifically, to a vinyl chloridepolymer of which the polydispersity index is 2.0 to 2.3 and the porosity is 60% or higher, and a method for preparing the vinyl chloridepolymer. More particularly, in the method for preparing the vinyl chloride polymer, a vinyl chloridepolymerization seed having aconversion rate of 5 to 20% is first prepared by means of prepolymerization, and then a vinyl chloridemonomer is input to the vinyl chloride polymerization seed and a vinyl chloride polymer is polymerized (main polymerization), wherein the temperature differential between the prepolymerization and the main polymerization is adjusted to 5 to 15 DEG C. The preparation method has the advantage of increasing polymerization productivity. The vinyl chloride polymer polymerized by means of the preparation method shows said physical properties and thus has the advantages of enhancing the fish eye quality and initial coloration as well as enabling excellent processability.
The invention discloses a material balanceintelligent control method for post-treatment of polyvinyl chloridepolymer. The material balanceintelligent control method comprises the following steps: S1, calculating the feeding amount of a stripping tower on line; s2, adjusting and balancing the feeding amount of the stripping tower while the step S1 is carried out; and gradually iteratively adjusting the temperature and the feeding flow in the stripping tower according to a set flow adjustment target value by adopting a hill climbingalgorithm. The online calculation of the feeding amount of the stripping tower is a fundamental way for solving automatic balance; meanwhile, in the flow adjusting process, the temperature and the feeding flow in the tower are gradually and iteratively adjusted according to a set flow adjusting target value by adopting a hill climbingalgorithm similar to the nature, so that the effect of removing the residual vinyl chloride is ensured, and the material balance of polymerization kettle-polymer post-treatment in polyvinyl chloride resin production and the automatic control of the operation of the stripping tower are realized; the working condition is stable, collision-free switching is achieved, operation is safe, and material balance and process indexes are ensured.