News Details
Thermosetting phenolic resin flame retardant
2017-11-1 11:59:05
Thermosetting phenolic resin flame retardant
Phenolic resin is by phenolic compounds (such as phenol, cresol, two phenol, Resorcinol, tert butyl phenol, bisphenol A) and aldehyde compounds (such as formaldehyde, acetaldehyde, formaldehyde and furfural etc.) in alkaline or acidic catalyst, via addition polycondensation resin are called phenolic resin.
The reaction between phenol and aldehyde is quite complex. Because of the molar ratio of phenol to formaldehyde, the speed and the composition of addition and polycondensation are also different due to the different catalysts.
Synthetic thermosetting phenolic resin. Then the thermosetting phenolic resin flame retardant was added, the pH value of the regulating system was 2-4, the temperature was 75-80 degrees, and the microcapsules containing thermosetting phenolic resin flame retardant were prepared.
The reaction of basic catalysts: many inorganic bases and organic bases can be used as basic catalysts. Sodium hydroxide, barium hydroxide, ammonium hydroxide, calcium hydroxide and ethylamine are commonly used. 1mol (sometimes up to 2.5mol) of formaldehyde in the presence of an alkaline catalyst, the addition reaction is dominant, and the condensation reaction is relatively slow, the early generation of resin for phenolic resin, mainly as follows: 1, reaction process of reaction with (hydroxymethyl). Phenol and formaldehyde were firstly added to produce 1~3 hydroxymethyl phenol.
2. Condensation reaction (methylene blue). The phenolic resin was further condensed to form an initial resin, or thermosetting phenolic resin (resols), a resins resin (A-stage resin), and a one-step resin.
(1) phenol reacts with hydroxymethyl phenol to form two (hydroxymethyl methane)
(2) reaction between hydroxymethyl phenol
(3) phenol or hydroxymethyl reacts with two polymers or polymers and reacts among the polymers.
Acid catalyst reaction: acid catalyst is a strong acid, including inorganic acids and organic acids, commonly used in hydrochloric acid, sulfuric acid, oxalic acid, benzene sulfonic acid, petroleum sulfonic acid, chloroacetic acid, etc..
In the acid catalytic reaction, general with molar ratio of phenol to formaldehyde is greater than 1:0.9, generated by nuclear condensation and hydroxymethyl phenol formaldehyde and phenol is much faster than the rate of addition of a linear structure, the resin is fusible. Therefore, it is called thermoplastic phenolic resin (novolak) or linear phenolic resin. The reaction process is as follows: formaldehyde is activated under acidic catalysis, and the reaction rate of methylene is faster than the rate of hydroxymethyl reaction to produce linear thermoplastic phenolic resin.
Tris (1,3-Dichloro-2-Propyl) Phosphate (Flame Retardant TDCPP)
CAS No.:13674-87-8
HS: 29199000
Tax Rate (%): 9%
Tris (1,3-Dichloro-2-Propyl) Phosphate (TDCPP) Raw Materials: Phosphorus Oxychloride, Epichlorohydrin
Tris (1,3-Dichloro-2-Propyl) Phosphate (Flame Retardant TDCPP) Use:
The Product Has A High Efficiency Flame Retardant, Low Volatility, High Thermal Stability, Water Resistance, Alkali Stable And Soluble In Most Organic Substances, Processing Performance, With Plastic, Moisture, Anti-Static, Anti-Pull, Anti-Compression Performance. Widely Used In Unsaturated Polyester, Polyurethane Foam, Epoxy Resin, Phenolic Resin, Rubber, Soft Polyvinyl Chloride, Synthetic Fibers And Other Plastics And Coatings At High Temperature Pyrolysis, Can Be Used As Emulsifier And Explosion-Proof Agent.
(1) formaldehyde, combined with water can form methylene glycol (HOCH2OH), in acidic medium, methylene glycol to generate hydroxyl methyl cation; (+CH2OH) hydroxyl methyl cation of electrophilic substitution reaction of phenol in ortho and para, ortho hydroxymethyl phenol and generation of hydroxyl methyl phenol
(2), hydroxymethyl phenol condensation of phenol is two (Qiang Benji) methane (dihydroxydiphenylmethane) two (Qiang Benji) methane has 3 isoforms: 2,2 "(Qiang Benji) - two '- two 2,4 methane; (hydroxyphenyl) methane and 4,4' - two (Qiang Benji) methane. The ratio of the three isomers is related to the PH of the reaction medium. In the acidic medium, the latter two isomers are the main products.
The three isomers reacted with formaldehyde, and the resulting hydroxymethyl group was condensed with phenol.
In the synthesis of thermoplastic phenolic resin, phenol excess limit increase of the molecular weight of the resin, the average molecular contains about 5~6 benzene ring, does not exist without hydroxymethyl reaction, even if long-term heating can only be melted, without curing is called thermoplastic phenolic resin. Because the 3 functional groups of phenol do not react completely, they can be converted into thermosetting phenolic resin when heated with six methyl four amines and paraformaldehyde.
Synthesis of phenolic resin prepolymer, the condition of 70 - 80 degrees, ph8-9 reaction 2h, and then coated. The condition pH value is 2-4, and the temperature is 75-80 degrees.
Phenolic foam is organic polymer rigid foam products, is made of thermosetting phenolic resin foam, it has the advantages of light weight, fire prevention, not burning, smokeless, non-toxic, non drip, using temperature range (-196 to +200 DEG C) under low temperature environment does not shrink, not brittle, insulation material is ideal HVAC engineering and because of the phenolic foam obturator high rate, low thermal conductivity, good thermal insulation properties, and has the water resistance and water vapor permeability, is an ideal energy-saving insulation materials.
Because phenolic resin has benzene ring structure, the size is stable, the change rate is <1%. And the chemical composition is stable, anti-corrosion and anti-aging, especially the ability to resist organic solution, strong acid and weak base corrosion. Without freon vesicant in compliance with international environmental standards in the production process of foam, and its molecular structure containing hydrogen, oxygen, carbon, high temperature decomposition, overflow gas non-toxic, tasteless, are harmless to the human body and environment, meet the national requirements of environmental protection. Therefore, phenolic super composite board is the most ideal fire protection, heat insulation, energy saving, beautiful environmental protection green insulation material.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Phenolic resin is by phenolic compounds (such as phenol, cresol, two phenol, Resorcinol, tert butyl phenol, bisphenol A) and aldehyde compounds (such as formaldehyde, acetaldehyde, formaldehyde and furfural etc.) in alkaline or acidic catalyst, via addition polycondensation resin are called phenolic resin.
The reaction between phenol and aldehyde is quite complex. Because of the molar ratio of phenol to formaldehyde, the speed and the composition of addition and polycondensation are also different due to the different catalysts.
Synthetic thermosetting phenolic resin. Then the thermosetting phenolic resin flame retardant was added, the pH value of the regulating system was 2-4, the temperature was 75-80 degrees, and the microcapsules containing thermosetting phenolic resin flame retardant were prepared.
The reaction of basic catalysts: many inorganic bases and organic bases can be used as basic catalysts. Sodium hydroxide, barium hydroxide, ammonium hydroxide, calcium hydroxide and ethylamine are commonly used. 1mol (sometimes up to 2.5mol) of formaldehyde in the presence of an alkaline catalyst, the addition reaction is dominant, and the condensation reaction is relatively slow, the early generation of resin for phenolic resin, mainly as follows: 1, reaction process of reaction with (hydroxymethyl). Phenol and formaldehyde were firstly added to produce 1~3 hydroxymethyl phenol.
2. Condensation reaction (methylene blue). The phenolic resin was further condensed to form an initial resin, or thermosetting phenolic resin (resols), a resins resin (A-stage resin), and a one-step resin.
(1) phenol reacts with hydroxymethyl phenol to form two (hydroxymethyl methane)
(2) reaction between hydroxymethyl phenol
(3) phenol or hydroxymethyl reacts with two polymers or polymers and reacts among the polymers.
Acid catalyst reaction: acid catalyst is a strong acid, including inorganic acids and organic acids, commonly used in hydrochloric acid, sulfuric acid, oxalic acid, benzene sulfonic acid, petroleum sulfonic acid, chloroacetic acid, etc..
In the acid catalytic reaction, general with molar ratio of phenol to formaldehyde is greater than 1:0.9, generated by nuclear condensation and hydroxymethyl phenol formaldehyde and phenol is much faster than the rate of addition of a linear structure, the resin is fusible. Therefore, it is called thermoplastic phenolic resin (novolak) or linear phenolic resin. The reaction process is as follows: formaldehyde is activated under acidic catalysis, and the reaction rate of methylene is faster than the rate of hydroxymethyl reaction to produce linear thermoplastic phenolic resin.
Tris (1,3-Dichloro-2-Propyl) Phosphate (Flame Retardant TDCPP)
CAS No.:13674-87-8
HS: 29199000
Tax Rate (%): 9%
Tris (1,3-Dichloro-2-Propyl) Phosphate (TDCPP) Raw Materials: Phosphorus Oxychloride, Epichlorohydrin
Tris (1,3-Dichloro-2-Propyl) Phosphate (Flame Retardant TDCPP) Use:
The Product Has A High Efficiency Flame Retardant, Low Volatility, High Thermal Stability, Water Resistance, Alkali Stable And Soluble In Most Organic Substances, Processing Performance, With Plastic, Moisture, Anti-Static, Anti-Pull, Anti-Compression Performance. Widely Used In Unsaturated Polyester, Polyurethane Foam, Epoxy Resin, Phenolic Resin, Rubber, Soft Polyvinyl Chloride, Synthetic Fibers And Other Plastics And Coatings At High Temperature Pyrolysis, Can Be Used As Emulsifier And Explosion-Proof Agent.
(1) formaldehyde, combined with water can form methylene glycol (HOCH2OH), in acidic medium, methylene glycol to generate hydroxyl methyl cation; (+CH2OH) hydroxyl methyl cation of electrophilic substitution reaction of phenol in ortho and para, ortho hydroxymethyl phenol and generation of hydroxyl methyl phenol
(2), hydroxymethyl phenol condensation of phenol is two (Qiang Benji) methane (dihydroxydiphenylmethane) two (Qiang Benji) methane has 3 isoforms: 2,2 "(Qiang Benji) - two '- two 2,4 methane; (hydroxyphenyl) methane and 4,4' - two (Qiang Benji) methane. The ratio of the three isomers is related to the PH of the reaction medium. In the acidic medium, the latter two isomers are the main products.
The three isomers reacted with formaldehyde, and the resulting hydroxymethyl group was condensed with phenol.
In the synthesis of thermoplastic phenolic resin, phenol excess limit increase of the molecular weight of the resin, the average molecular contains about 5~6 benzene ring, does not exist without hydroxymethyl reaction, even if long-term heating can only be melted, without curing is called thermoplastic phenolic resin. Because the 3 functional groups of phenol do not react completely, they can be converted into thermosetting phenolic resin when heated with six methyl four amines and paraformaldehyde.
Synthesis of phenolic resin prepolymer, the condition of 70 - 80 degrees, ph8-9 reaction 2h, and then coated. The condition pH value is 2-4, and the temperature is 75-80 degrees.
Phenolic foam is organic polymer rigid foam products, is made of thermosetting phenolic resin foam, it has the advantages of light weight, fire prevention, not burning, smokeless, non-toxic, non drip, using temperature range (-196 to +200 DEG C) under low temperature environment does not shrink, not brittle, insulation material is ideal HVAC engineering and because of the phenolic foam obturator high rate, low thermal conductivity, good thermal insulation properties, and has the water resistance and water vapor permeability, is an ideal energy-saving insulation materials.
Because phenolic resin has benzene ring structure, the size is stable, the change rate is <1%. And the chemical composition is stable, anti-corrosion and anti-aging, especially the ability to resist organic solution, strong acid and weak base corrosion. Without freon vesicant in compliance with international environmental standards in the production process of foam, and its molecular structure containing hydrogen, oxygen, carbon, high temperature decomposition, overflow gas non-toxic, tasteless, are harmless to the human body and environment, meet the national requirements of environmental protection. Therefore, phenolic super composite board is the most ideal fire protection, heat insulation, energy saving, beautiful environmental protection green insulation material.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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