Check influencePhenolic aldehyde colophonyThe element of preparation, phenolic aldehyde colophony is breed of colophony of human early complex, from 1905 the father ”Dr.LeoBacke-land of colophony of phenolic aldehyde of American scientist “ casts phenolic aldehyde colophony the person to commercialize production up to now, already had history of near 100 years. The phenolic aldehyde expanded plastics that regards phenolic aldehyde as new development has workmanship simple, low-cost wait for a characteristic. In recent years, wait for rapid development of the industry as building, petro-chemical, shipping, the material of qualitative light, fire prevention, low poison is taken seriously gradually. In commonly used adiabatic foam, phenolic aldehyde expanded plastics has the advantage that other expanded plastics cannot compare more. Phenolic aldehyde expanded plastics is applicable temperature limits - 150~150 ℃ . Use temperature for a long time to be able to amount to 140 ~ commonly 150 ℃ . Phenolic aldehyde expanded plasticsoutstanding characteristic is critical oxygen index tall, its oxygen index is 35 ~ commonly 50% . Phenolic aldehyde expanded plastics heats up dimension stability, metabolic ratio is small, inside use temperature limits, size variation ratio is less than 1% . But phenolic aldehyde expanded plastics is faulty also, brittleness is for instance big, pulverization rate is high, the effect that intensity, coefficient of thermal conductivity suffers density is bigger. About preparation of phenolic aldehyde expanded plastics, phenolic aldehyde expanded plastics adds person vesicant, modifier and exterior activator to be in by solubility colophony activator (solidify agent) below action, cross-linking happens inside phenolic aldehyde element, form heat up solid sex colophony and epispastic shape. But epispastic sex colophony: Below acidity condition, the Maerbi of formaldehyde and phenol is 0.7 ~ 0.8, generate thermoplastic phenolic aldehyde colophony, use chemical foaming agent commonly. Below basic requirement, maerbi is formaldehyde and phenol 1.2 ~ 1.5, generate colophony of armour rank phenolic aldehyde to heat up colophony of solid sex phenolic aldehyde namely, use physical foaming agent commonly. The performance of phenolic aldehyde colophony that uses mixture activator to fall when colophony is synthesized is good. Colophony of armour rank phenolic aldehyde is complex content of condensation polymerization of element of much nucleus phenol, the easy happening that shrink and react, viscosity increases, can be in room temperature or store under room temperature 4~8 week, do not exceed 12 weeks more. Solidify agent: Solidify agent also weighs acidity activator. Inorganic acid or organic acid are helpful for resinous cross-linking solidify, cause caloric to increase, stimulative vesicant vaporization. The choice of solidify agent, have bigger effect to foamy structure and intensity. Strong inorganic acid corrodes a metal, use gentle activator more, if phosphoric acid and benzene sulfur are acerbity. Exterior activator: Exterior activator namely bleb stabilizing agent. It can reduce pulling force of phenolic aldehyde surface, the bubble of generation is changed imperceptibly, stability is changed, bubble is even and compact, prevent fracture of epispastic thin bleb wall, produce Marangoni effect. Commonly used surface activator is mixed like silicon ketone say lukewarm set. Foaming agent: Colophony of armour rank phenolic aldehyde is contained the 10% one 20 water that keep quality score and a few free formaldehyde, in epispastic in can have foaming agent effect, but the bubble that gets irregular large hole, need to add foaming agent. The volatile liquid that vesicant of commonly used physics is low boiling point is mixed like hydrogenous fluorine hydrocarbon, 2 chloric firedamp pentane. Still have solid foaming agent, wait like aluminium powder, NaZ503. Modifier: Phenolic aldehyde expanded plastics has brittleness, raise its the intensity, modified research that enhances tenacity is very active. A benzene is joined when synthesizing phenolic aldehyde 2 phenol or aldehyde of the candy that add a person, raise its machinery intensity and humidity sex; to be in epispastic when mix with vinegar of much surprise cyanic acid, reaction has between the element, raise cross-linking rate, the blame response that tenacity gets strengthening; adds low cost the brittleness that filling can improve phenolic aldehyde product or those who reduce pair of metals is caustic wait. More and detailed report pays close attention to Www.cnfrp.com of answer ability network please

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