Plastic molds are tools in the plastics processing industry that are used in conjunction with plastic molding machines to give plastic products a complete configuration and precise dimensions. Due to the variety of plastics and processing methods, the structure of plastic molding machines and plastic products is not simple, so the types and structures of plastic molds are also varied. classification The general classification of molds can be divided into plastic molds and non-plastic molds: Non-plastic mold (1) Non-plastic molds include: casting molds, forging molds, stamping molds, and die casting molds. A. Casting mold - faucet, pig iron platform B. Forging Die - Auto Body C. Stamping Die - Computer Panel D. Die Casting Die - Superalloy, Block Plastic mold (2) Plastic molds are divided into: A. injection molding mold - TV housing, keyboard buttons (the most common application) B. Blow Mold - Beverage Bottle C. Compression Mold - Bakelite Switch, Scientific Porcelain Dishes D. Transfer Molding - Integrated Circuit Products E. Extrusion Molding - glue pipe, plastic bag F. Thermoforming Mold - Transparent Molded Package G. Rotary Molding - Soft Rubber Doll Toy Basic knowledge of plastic mold products A combined plastic mold for compression molding, extrusion molding, injection molding, blow molding, and low foam molding, which mainly comprises a variable cavity composed of a female die combination substrate, a die assembly and a die combination card board The female die comprises a punch with a variable core, which is composed of a male die combination substrate, a male die assembly, a male die combination card board, a cavity cutting assembly and a side cut assembly board. Coordinated changes in the convex, concave, and auxiliary molding systems of the die. Can process different shapes, different sizes of series of plastic parts. The various tools and products used in our daily production and life are as large as the base of the machine tool, the shell of the machine body, and the size of a single head screw, button, and shell of various household appliances, all of which are closely related to the mold. The shape of the mold determines the shape of these products. The quality and accuracy of the mold determines the quality of these products. Because of the different materials, appearances, specifications, and uses of various products, molds are divided into non-plastic molds such as casting molds, forging molds, die-casting molds, stamping molds, and plastic molds.
One, two, or three hydrogen atoms in an
ammonia molecule are substituted with an alkyl group to produce compounds
called first amines (primary amines), second amines (secondary amines), and
tertiary amines (tertiary amines), respectively. Their general formulas are:
RNH2 - primary amine, R2NH - secondary amine, R3N - tertiary amine. Amines are
widely present in the biological world and have extremely important
physiological effects. Therefore, the vast majority of drugs contain the
functional group of amines - amine groups. Proteins, nucleic acids, many
hormones, antibiotics, and alkaloids all contain amine groups that are complex
derivatives of amines. According to the different types of hydroxyl groups in the amine molecule connected to the nitrogen atom, amines can be divided into fatty amines and aromatic amines. If the amine molecule contains two or more amino groups (-NH2), it can be divided into dibasic amines and terbasamines according to the number of amino groups.
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Amines are widely distributed in nature, most of which are produced by amino acid decarboxylation. For example, the industrial preparation of amines is mostly prepared by the reaction of ammonia with alcohol or haloalkanes, and the product is a mixture of amines at all levels, which is purified after fractionation. Catalytic reduction by aldehydes and ketones in the presence of ammonia can also obtain corresponding amines. In industry, amine compounds are often prepared by catalytic reduction of nitro compounds, nitriles, amides or nitrogen-containing heterocyclic compounds
Amines are used for a wide range of purposes. The earliest development of the dye industry was based on aniline. Some amines are necessary to maintain life activities, but some are also very harmful to life, many amine compounds have carcinogenic effects, especially aromatic amines, such as naphthylamine, benzidine and so on.