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Melamine - Formaldehyde resin and plastics
by：CSSSLD
2021-01-23
Although processing injection molding products with higher accuracy can be obtained, but the larger molding shrinkage rate and thermal expansion coefficient is difficult to apply 1, 2 levels of high precision products.
Plastic widely used as insulating material, but not suitable for 550 kv ultra-high voltage insulation materials;
In addition to the special occasions, should not be made into high conductive materials and products.
In addition, although some occasions suitable for plastic materials, but because of cost factors unfavorable choose too.
UF non-toxic, odourless, tasteless, itself is transparent, white translucent after adding cellulose filler, adding titanium dioxide is opaque white, if add other stains can be made as the surface is bright and clean, bright colours of jade products, and more used in tableware, buttons, handle, shell, adornment, also can be used in the industrial electrical, instrumentation and other accessories. Melamine - Formaldehyde resin is composed of melamine and formaldehyde polycondensation of thermosetting resin, in the 1930 s began to realize industrial production.
plastic material has its own applicability compared with other materials, selection of plastic material is to maximum full play the advantages, avoid disadvantages. As with other materials, plastic can't be perfect, limiting the application in certain occasions. Generally, plastic materials should not be used in products of high mechanical strength requirements, especially for high stiffness requirement of structure and tensile strength of more than 300 mpa, such as high load heavy machinery parts, large span structures, etc. Heat resistance in 80 - of commonly used plastic materials 200 ℃, some characteristics of the engineering plastics long using temperature is 300 ℃, so normally, above 350 ℃ plastic material is not applicable.
melamine - Formaldehyde resin synthesis principle similar to UF, first by melamine and formaldehyde addition reaction, mainly generated three hydroxyl methyl and hydroxymethyl melamine, and then further condensed to form three methylol melamine resin. Due to the molecular structure of MF has three nitrogen heterocyclic structure and contain more able to crosslinking reaction active group, crosslinking, wet resistance and heat resistance of cured product mechanical strength is better than that of urea formaldehyde resin.
with MF as base material, adding curing agent, filler, colorants, lubricants can be obtained, such as MF plastic, hereinafter referred to as melamine plastics. He not only has the advantages of UF plastic similar and bibulous rate is low, has higher heat resistance, moisture resistant, can be in boiling water under the conditions of use for a long time, sometimes using temperature is 150 - 200℃。 MF high surface hardness of plastic products, pollution resistance, can easily remove the tea dirt like ceramics, therefore, widely used in tableware and arc resistant products. MF besides used to produce molding compound, can also be used for injection molding, manufacturing laminated plastic products, adhesives, etc.
UF curing product contains more nitrogen atoms, there is also a small amount of crosslinking curing hydroxymethyl, on the one hand has the flame retardant, arc resistance, easy coloring and the advantage of high surface hardness, on the other hand is the wet resistance is poor, it is susceptible to the effects of moisture and water and deformation or crack defects; Its heat resistance is poorer, the long-term use of temperature below 70 ℃, in terms of chemical structure, UF after curing with good solvent resistance, not affected by weak base, weak acid, strong alkali, strong acid to its erosion.
plastic material has reached a very high popularity, the impetus of the development of social novel materials. Has been put into industrial production of resin of hundreds, and every year there are new varieties appear constantly. Selection of plastic materials is in numerous varieties of resin can meet the injection molding processing plant products using performance and processing performance requirements of plastic materials and affordable. When select material, need to consider many factors, such as the use environment of the performance characteristics of materials, products, and processing adaptability, source of raw materials, cost accounting, etc.
more excellent articles: the epoxy plastic component, click directly.
http://www。 csssld。 cn//html/2017/Info_1107/714。 HTML
changshu smoothly da plastic products factory website: http://www. csssld。 Cn /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
UF non-toxic, odourless, tasteless, itself is transparent, white translucent after adding cellulose filler, adding titanium dioxide is opaque white, if add other stains can be made as the surface is bright and clean, bright colours of jade products, and more used in tableware, buttons, handle, shell, adornment, also can be used in the industrial electrical, instrumentation and other accessories. Melamine - Formaldehyde resin is composed of melamine and formaldehyde polycondensation of thermosetting resin, in the 1930 s began to realize industrial production.
plastic material has its own applicability compared with other materials, selection of plastic material is to maximum full play the advantages, avoid disadvantages. As with other materials, plastic can't be perfect, limiting the application in certain occasions. Generally, plastic materials should not be used in products of high mechanical strength requirements, especially for high stiffness requirement of structure and tensile strength of more than 300 mpa, such as high load heavy machinery parts, large span structures, etc. Heat resistance in 80 - of commonly used plastic materials 200 ℃, some characteristics of the engineering plastics long using temperature is 300 ℃, so normally, above 350 ℃ plastic material is not applicable.
melamine - Formaldehyde resin synthesis principle similar to UF, first by melamine and formaldehyde addition reaction, mainly generated three hydroxyl methyl and hydroxymethyl melamine, and then further condensed to form three methylol melamine resin. Due to the molecular structure of MF has three nitrogen heterocyclic structure and contain more able to crosslinking reaction active group, crosslinking, wet resistance and heat resistance of cured product mechanical strength is better than that of urea formaldehyde resin.
with MF as base material, adding curing agent, filler, colorants, lubricants can be obtained, such as MF plastic, hereinafter referred to as melamine plastics. He not only has the advantages of UF plastic similar and bibulous rate is low, has higher heat resistance, moisture resistant, can be in boiling water under the conditions of use for a long time, sometimes using temperature is 150 - 200℃。 MF high surface hardness of plastic products, pollution resistance, can easily remove the tea dirt like ceramics, therefore, widely used in tableware and arc resistant products. MF besides used to produce molding compound, can also be used for injection molding, manufacturing laminated plastic products, adhesives, etc.
UF curing product contains more nitrogen atoms, there is also a small amount of crosslinking curing hydroxymethyl, on the one hand has the flame retardant, arc resistance, easy coloring and the advantage of high surface hardness, on the other hand is the wet resistance is poor, it is susceptible to the effects of moisture and water and deformation or crack defects; Its heat resistance is poorer, the long-term use of temperature below 70 ℃, in terms of chemical structure, UF after curing with good solvent resistance, not affected by weak base, weak acid, strong alkali, strong acid to its erosion.
plastic material has reached a very high popularity, the impetus of the development of social novel materials. Has been put into industrial production of resin of hundreds, and every year there are new varieties appear constantly. Selection of plastic materials is in numerous varieties of resin can meet the injection molding processing plant products using performance and processing performance requirements of plastic materials and affordable. When select material, need to consider many factors, such as the use environment of the performance characteristics of materials, products, and processing adaptability, source of raw materials, cost accounting, etc.
more excellent articles: the epoxy plastic component, click directly.
http://www。 csssld。 cn//html/2017/Info_1107/714。 HTML
changshu smoothly da plastic products factory website: http://www. csssld。 Cn /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
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