What is the difference between PP material and PBT material

Polypropylene has many excellent properties: 1. The relative density is small, only 0.89-0.91, making it one of the lighter varieties in plastic. 2. Good mechanical properties, except for impact resistance, all other mechanical properties are better than polyethylene, and the molding and processing performance is good. 3. It has high heat resistance and can be continuously used at temperatures ranging from 110 to 120 ℃. 4. Good chemical properties, almost no water absorption, and does not react with the vast majority of chemicals. 5. Pure texture and toxicity. 6. Good electrical insulation. 7. The transparency of polypropylene products is better than that of high-density polyethylene products. It has many advantages but also disadvantages: 1. The product has poor cold resistance and low low-temperature impact strength. 2. Products are prone to aging due to the effects of light, heat, and oxygen during use. 3. Poor colorability. 4. Easy to burn. 5. Poor toughness, high static electricity, poor dyeing, printing, and adhesion.

Main components and composition of color masterbatch

Color masterbatch is composed of an excess of chemical additives, carrier resins, and dispersants. Color masterbatch is an aggregate obtained by uniformly attaching super constant pigments (dyes) to a resin. Main components of color masterbatch 1. Colorants Colorants are the main components of the color master batch. The colorants used in color masterbatches such as polyolefins and PVC are pigments, and various pigments with different properties are selected according to their different uses. The color masterbatch for engineering plastics can use solvent dyes, some advanced organic pigments, and some high-temperature resistant infinite pigments. Generally speaking, dyes should not be used for coloring polyolefins as they may cause severe migration. Pigments can be divided into organic pigments and inorganic pigments. Commonly used organic pigments include phthalocyanine red, phthalocyanine blue, phthalocyanine green, light fast red, macromolecular red, macromolecular yellow, permanent yellow, permanent purple, azo red, etc. Commonly used inorganic pigments include cadmium red, cadmium yellow, titanium dioxide, carbon black, iron oxide red, iron oxide yellow, etc

Main performance requirements for pigments used in plastic masterbatches

1. Coloring power The coloring power of a pigment refers to the amount of pigment required for a certain color product, expressed as a percentage of the coloring power of a standard sample. The coloring power of a pigment is not only related to its properties, but also to its degree of dispersion. The degree of dispersion mainly refers to the degree of refinement of the pigment. The greater the degree of dispersion, the stronger its coloring power, but it has a saturation value. 2. Heat resistance Heat resistance refers to the degree of change in the color or performance of pigments under processing and usage temperatures. When considering the heat resistance of pigments, it is also important to consider their heating time. Due to the different processing methods and heating times of plastics when processed into products, and the different uses and heating times during use, the higher the temperature used, the shorter the heat resistance time. 3. Migration resistance The migration resistance of pigments refers to that the colored plastics may have physical and chemical reactions with the above substances when they are in long-term contact with other solid, liquid, gas and other substances or when they work in a specific environment, which is manifested by the migration of pigments from the inside of plastics to the Free surface of products, or to the adjacent plastics or solvents. 4. Light resistance and weather resistance Plastic products require good light and weather resistance due to long-term outdoor use. Some pigments undergo varying degrees of color changes under light exposure. Weathering resistance refers to the color stability of pigments under natural conditions. Due to its extensive outdoor use, the black mother pays special attention to migration resistance and weather resistance.

What is color masterbatch? Why use color masterbatch?

Color mother, also known as color species, It is an aggregate made by uniformly attaching super constant pigments or dyes to branches, Several benefits of using color masterbatch: Helps to maintain the chemical stability of pigments; Better dispersion of pigments in plastic; Protect the health of operators; The process is simple, the color change is easy, the environment is clean, and the utensils are not contaminated; Save time and raw materials. Due to the direct contact between pigments and air during storage and use, As a result, phenomena such as moisture absorption, oxidation, and agglomeration will occur, Direct use will cause color spots on the surface of plastic products, resulting in a darker hue and easy color fading, And it causes dust to fly during mixing, affecting the health of operators, And the color masterbatch undergoes mechanical processing during the production process, The pigment has been refined and thoroughly mixed with branch carriers and dispersants, Isolates pigments from air and moisture, thereby enhancing their weather resistance Improved the dispersibility and coloring power of pigments, resulting in a bright hue. Due to the similarity in shape between the color masterbatch and the branch particles, So it is more convenient and accurate in measurement, and it will not adhere to the container during mixing, Therefore, it saves cleaning time and raw materials used for cleaning the machine.

What are the antioxidants used for color masterbatches?

Antioxidants are widely used additives in plastics. According to the molecular structure and action mechanism, the commonly used plastic antioxidants are generally divided into four categories: hindered phenols, Phosphorous acid esters, thio compounds and composite compounds. Hindered phenolic antioxidants are the main antioxidants in plastic materials, and their main function is to interact with the oxidation free radicals R The ROO reaction interrupts the growth of the active chain. Hindered phenolic antioxidants can be divided into mono phenols, bisphenols, polyphenols, heterocyclic polyphenols and other varieties according to their molecular structures. Monophenol and bisphenol antioxidants, such as BHT, 2246, and other products, are prone to coloring plastic products due to their low molecular weight, high volatility and mobility, In recent years, the consumption of plastics has significantly decreased.

What is PBT plastic

Chinese name of PBT: Polybutylene terephthalate is a milky white, crystalline, linear saturated polyester. It is also an engineering plastic with excellent comprehensive performance. The long-term working temperature is between -40 ℃ and+120 ℃. PBT has superior characteristics: 1. Low moisture absorption 2. Good sliding and high wear resistance 3. High tensile strength and stiffness 4. Good impact strength 5. Good processability 6. Good bonding performance, weldable 7. Thermal aging stability 8. Good dimensional stability 9. Food grade and compliant with FDA standards Modified PBT is mainly used in (1) electronic appliances: connectors, switch parts, household appliances, accessory parts, small electric covers or (heat resistance, flame retardancy, electrical insulation, forming and processing properties); (2) Automobile: 1. External parts: mainly including corner grille, engine heat release hole cover, etc; 2. Internal components: mainly including endoscopic braces, wiper brackets, and control system valves; 3. Automotive electrical components: automotive ignition coil twisted tubes and various electrical connectors, etc.