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With China Plastic Machinery
With China Plastic Machinery
Refers to materials that are mainly composed of resin (or directly polymerized with monomers during processing) and additives such as plasticizers, fillers, lubricants, colorants, etc. as auxiliary ingredients, and can flow and form during processing.
Plastic sheet refers to plastic raw materials (particles) that are heated in a plastic extruder or plastic calender, melted, and then extruded or calendered to produce a plastic coil with a thickness of about 0.25-1.00mm. The thickness of the sheet is greater than 1mm (the thickest can reach 40mm).
This type of material mainly includes PVC, PE, PP, HIPS, ABS, PC, PS, etc.
Features: good heat resistance, good chemical corrosion resistance, high mechanical strength, reliable electrical insulation performance, good hygiene, and excellent chemical stability.
Synthetic resin
Synthetic resin is the main component of plastic, and its content in plastic is generally 40% to 100%. Because of the large content and the properties of resin often determine the properties of plastic, people often regard resin as a synonym for plastic. For example, polyvinyl chloride resin is confused with polyvinyl chloride plastic, phenolic resin is confused with phenolic plastic. In fact, resin and plastic are two different concepts. Resin is an unprocessed raw polymer, which is not only used to make plastic, but also a raw material for coatings, adhesives and synthetic fibers. Except for a very small part of plastic that contains 100% resin, most plastic need to add other substances in addition to the main component resin.
Filler is also called filler, which can improve the strength and heat resistance of plastic and reduce costs. For example, adding wood powder to phenolic resin can greatly reduce costs, making phenolic plastic one of the cheapest plastic, and at the same time significantly improve mechanical strength. Fillers can be divided into two categories: organic fillers and inorganic fillers. The former include wood powder, rags, paper and various fabric fibers, and the latter include glass fiber, diatomaceous earth, asbestos, carbon black, etc.
Plasticizers can increase the plasticity and softness of plastic, reduce brittleness, and make plastic easy to process and shape. Plasticizers are generally high-boiling organic compounds that are miscible with resins, non-toxic, odorless, and stable to light and heat. The most commonly used are phthalates. For example, when producing polyvinyl chloride plastic, if more plasticizers are added, soft polyvinyl chloride plastic can be obtained. If no plasticizer is added or less plasticizer is added (dosage <10%), hard polyvinyl chloride plastic can be obtained.
In order to prevent synthetic resins from being decomposed and damaged by light and heat during processing and use, and to extend their service life, stabilizers should be added to plastic. Commonly used ones include stearates, epoxy resins, etc.
Colorants can give plastic a variety of bright and beautiful colors. Organic dyes and inorganic pigments are commonly used as colorants.
The function of lubricant is to prevent plastic from sticking to metal mold during molding, and at the same time make the surface of plastic smooth and beautiful. Commonly used lubricants include stearic acid and its calcium and magnesium salts.
In addition to the above-mentioned additives, flame retardants, foaming agents, antistatic agents, etc. can also be added to plastic to meet different usage requirements.
According to the variety, there are single-layer and multi-layer, flat and corrugated plates, foamed and non-foamed, single material and heterogeneous material composite.
According to different processing, it is divided into: lamination, extrusion (the simplest molding process), calendering.
According to different uses, it can be divided into: food grade, medical grade and ordinary grade.
According to whether the material used has recycled material infiltration, it can be divided into: new material, first-level material (grade A), and second-level recycled material (grade B).
Plastic sheets (plates) are widely used, and can be used to make containers, storage tanks, pads, and electrical insulation materials. Decorative panels and anti-skid mats are widely used in vehicles such as cars. Non-toxic plastic sheets are used as packaging in the food industry and hospital industry. Plastic sheets are also widely used in industry, commerce, and construction.
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