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Is there any difference between epoxy and polyester?

Is there any difference between epoxy and polyester?

One, the composition is different 1. Epoxy resin: the polycondensation product of epichlorohydrin and bisphenol A or polyol. 2. Polyester: a general term for polymers obtained by polycondensation of polyols and polyacids. Mainly refers to polyethylene terephthalate (PET), and customarily also includes linear thermoplastic resins such as polybutylene terephthalate (PBT) and polyarylate. 2. Different application fields 1. Epoxy resin: Epoxy resin is mainly used in the coating industry and the electronics industry. Epoxy for composite molding (mainly used in printed circuit boards in the electronics industry) accounts for a quarter.

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2022

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What catalyst is used for polyester polyol

What catalyst is used for polyester polyol

Polyester polyols, organic substances, are usually formed by the condensation (or transesterification) of organic dicarboxylic acids (anhydrides or esters) and polyols (including diols) or the polymerization of lactones and polyols. The dibasic acid includes phthalic acid or phthalic anhydride or its ester, adipic acid, halogenated phthalic acid and the like. Polyols include ethylene glycol, propylene glycol, diethylene glycol, trimethylolpropane, pentaerythritol and the like. Different varieties of polyester polyols have different properties due to different types or different preparation processes. Several important indicators for polyester polyols are hydroxyl value, acid value, moisture, viscosity, molecular weight, density and chromaticity, etc. . Characteristics and uses of polyester polyols: Polyester polyurethane contains more polar groups such as ester groups and amino groups in the molecule, and has strong cohesive strength and adhesion, and has high strength and wear resistance.

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2022

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What do packaging products generally contain?

What do packaging products generally contain?

There are a wide range of packaging products, commonly used are paper bags, cartons, cartons, paper tubes, wooden boxes, plastic bags, plastic boxes, plastic baskets, plastic buckets, blister, foam, glass bottles, glass jars, clay jars, Iron boxes, iron drums, etc. According to the material, it can be divided into paper, wood, plastic, foam, glass, ceramics, metal, etc. Among them, plastic packaging products can be divided into blow molding, blister molding, injection molding, etc. according to the process. Bottles, etc., plastic products include lunch boxes, trays, etc., injection products include sealed boxes, bottle caps, plastic baskets, etc.

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2022

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The difference between packaging materials and packaging products

The difference between packaging materials and packaging products

Classification of packaging materials: Paper packaging materials: packaging paper honeycomb paper, paper bag paper, desiccant packaging paper, honeycomb paperboard, kraft paper industrial paperboard, honeycomb paper core. Plastic packaging materials: PP packaging tape, PET packaging tape, tear film, stretch film, sealing tape, heat shrinkable film, plastic film, hollow board. Composite flexible packaging materials: flexible packaging, aluminized film, iron core wire, aluminum foil composite film, vacuum aluminized paper, composite film, composite paper, BOPP. Metal packaging materials: tinplate aluminum foil, barrel hoop, steel belt, packing buckle, blister aluminum, PTP aluminum foil, aluminum plate, steel buckle. Ceramic packaging materials: ceramic bottles, ceramic cylinders, ceramic jars, ceramic pots. Glass packaging materials: glass bottles, glass jars, glass boxes. Wood packaging materials: Packaging made of wood products and artificial wood panels, such as wooden boxes, barrels, wooden boxes, wooden plywood, fiberboard boxes, plywood boxes, and wooden pallets.

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2022

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Titanate coupling agent manufacturers tell you the precautions for using silane coupling agents and how to choose them

Titanate coupling agent manufacturers tell you the precautions for using silane coupling agents and how to choose them

Titanate coupling agent manufacturers tell you the precautions for using silane coupling agents. 1. According to the principle of chemical reaction, silane can only exert its coupling effect under hydrolysis conditions, but this does not mean that water must be added to the system. The water adsorbed in the material and the water vapor in the air can usually meet the requirements of hydrolysis. Whether or not the silane is prehydrolyzed depends on the specific conditions.

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2022

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Follow the titanate coupling agent manufacturer to see what is a coupling agent and its selection principles

Follow the titanate coupling agent manufacturer to see what is a coupling agent and its selection principles

What is a coupling agent? The titanate coupling agent manufacturer said that the coupling agent is a substance with a two-property structure. Some groups in its molecule can react with chemical groups on the surface of inorganic materials to form chemical bonds; another part of the groups have organic affinity. It can chemically react with organic molecules or produce strong intermolecular interactions, so that two materials with completely different properties can be firmly combined. Since most coupling agents can chemically treat the surface of the filler, the effect is very good, which can effectively improve the dispersion state of the inorganic filler in the polymer matrix, and improve the mechanical properties and performance of the filled polymer material.

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