PVC Paste Resin

With the continuous development of processed products, the development of polyvinyl chloride paste resin is very rapid. At present, the demand for it in the international market is increasing, and its development and utilization prospects are also very broad.

• PVC paste resin can produce some special products, such as plastic products, foam artificial leather, microporous plastic, steel plate plastic layer, automotive decorative materials, electrical materials, etc.
• It is widely used in artificial leather, decorative materials, floor leather, wall paper, industrial conveyor belts, sports grounds, paints, adhesives, toys, medical disposable gloves, daily decorative materials, electrical instruments and electrical tools and other fields.

Processing convenience

• Easy to mix with plasticizers and other additives to make PVC paste, which is convenient for subsequent processing operations.
• Compared with traditional suspension resins, the processing equipment of pvc emulsion resin is cheaper, the mold is simple and cheap, and it is suitable for small-scale and multi-variety production.

Molding performance

• It can be made into special shapes and is easy to foam to meet the molding needs of different products.
• The product is heated less times, which improves production efficiency and physical properties of the product.

Physical and chemical stability

• The particle size is fine, the texture is like talcum powder, it has non-flowability, convenient configuration, and stable performance.
• Good chemical stability, with certain mechanical strength, easy coloring and other characteristics.
• It is stable to acids, alkalis and salts at room temperature, odorless, non-toxic, safe and reliable.

Wide application field

• Widely used in the production of artificial leather, vinyl toys, soft trademarks, wallpaper, paint coatings, foamed plastics, etc.
• Suitable for coating, dipping, spraying, foaming and other processing technologies to meet the manufacturing needs of a variety of products.

Excellent technical indicators

• Viscosity number, K value, average degree of polymerization, standard paste viscosity and other technical indicators meet the standard requirements to ensure stable product performance.
• The appearance of slightly white fine powder and good particle size distribution make it more uniform and easy to operate during application.

Environmental protection and safety

• It is considered safe when used as a food additive and will not have toxic effects on the human body.
• In industrial applications, its good environmental performance has also been widely recognized.

1. Microsuspension method

First of all, make a part of VCM (5%) into a stable emulsion (with a particle size of about 1.0 μm) by mechanical homogenization, and then carry out polymerization (an oil-soluble initiator must be selected). The PVC paste resin produced by this method has excellent fluidity, less emulsifier consumption, and improved thermal stability and water resistance of the resin.

2. Emulsion method

The emulsion polymerization formula mainly includes VCM, water, water-soluble initiator and emulsifier. In particular, emulsion polymerization requires very strict stirring, and the initiation is carried out in the water phase, and the commonly used initiator is water-soluble persulfate. Generally, the latex particle size obtained by emulsion polymerization is less than 0.2 μm. In order to achieve the purpose of increasing the latex particle size, the emulsion seed polymerization method was developed to increase the latex particle size to about 1.0 μm.

In emulsion polymerization, if there is already generated high polymer latex, control the material ratio and conditions. In principle, VCM only polymerizes on the generated latex particles, and no longer forms new particles; this generated high polymer latex The polymer latex is like a seed crystal, hence the name “emulsion seed polymerization”. But only a reasonable particle size is not enough, it must have an appropriate particle size distribution in order to obtain a PVC paste resin with excellent performance.

3. The mixed method

The mixed production process mainly integrates emulsion polymerization and microsuspension polymerization. In the whole reaction process, seeds after emulsion polymerization, other emulsifiers, initiators, various auxiliary agents and VCM are added to participate in the reaction. The mixing method uses C16 and C18 mixed linear alcohols and sodium lauryl sulfate or lauric acid amine to form an emulsifier to form a micro-emulsion, and the polymerization reaction is mainly carried out in micro-droplets. Adding seeds after emulsion polymerization makes the overall particle size distribution bimodal.