Pull crowded shape skill

Pull crowded shape skill is 1 kind of main complex materials shape skill, the most commonly used matrix colophony is colophony of not saturated polyester, vinyl ester, colophony of latter epoxy resin, phenolic aldehyde also is used at pulling crowded skill.
From theoretic tell, pull crowded shape skill is simpler. What use the variety that enhances a data relatively extensive, can apply fibroid, also can handle basketwork or felt account, its constituent can be fibre glass, also can be data of carbon fiber or fiber of fragrant black silk ribbon, other staple. Enhance a data to choose the successional way that feed a person commonly, choose for example without twist roving gauze is round, feed person fibrous idea one after another from gauze wearing. Pull crowded when shaping, fiber crosses the heat like measure of finished product of glass reinforced plastics to shape above all model, enter 1 to pull next make an organization. In gauze wearing and shape between the model, set groove of a glue, meantime places the colophony with have prefabricate good, fiber discharges cloth via directing equipment undertakes after macerate colophony, enter next shape model.

Pull in colophony of not saturated polyester crowded shape in skill, because chose active thinner styrene, itself can have the effect of cross-linking agent, because this is in,pull crowded shape volatile material won't produce inside the model. But phenolic aldehyde colophony is colophony of 1 kind of condensation polymerization, in colophony chain growth or cross-linking process, will produce member giving water. Because pull,squeeze shape modular antrum temperature often is in 100 ℃ above, process of solidify of phenolic aldehyde colophony is accordingly medium, water vapour how eduction, this is the skill key question that phenolic aldehyde draws crowded skill demand to handle [17] . Next acidity activator can corrode steel to pull crowded mould character through the small hole of chromic film, this also is phenolic aldehyde colophony is in pull crowded shape of skill respect use one of later ingredients.

Echo of condensation polymerization of 1) phenolic aldehyde gives off moisture, to playing the effect that squeezes skill place to happen
Be in early 20 centuries 80 years early days, a few phenolic aldehyde of European produce the manufacturer is germinant the phenolic aldehyde colophony of acerbity catalysis of research and development, its solidify temperature is 30 ～ about 80 ℃ , drop greatly temperature of solidify of resinous of original phenolic aldehyde (130-180 ℃ ) , prevent steam of shut-off of water to happen next. The phenolic aldehyde colophony of this kind of acerbity catalysis, but better land is applied paper at the hand, erupt, low-pressure moulding, RTM and fiber surround etc shape skill method, its finished product has crackajack fire prevention function, hair aerosol quantity is little, and noxiousness is low one step is good function. Through helping the practice test of crowded skill, colophony of acerbity catalysis phenolic aldehyde falls in microtherm solidify state, its achievement however with the imagination thoroughly contrary, specific watch nowadays: It is the water weight that the water weight that emit wants system of phenolic aldehyde of prep above high temperature, and still be sent fall under 100 ℃ nowadays, shape in what do not grow to 1m inside the model, phenolic aldehyde colophony is complete solidify is not perhaps; 2 it is achievement of function of basis actual measurement, hair when lever of glass reinforced plastics gives a model nowadays, just appear in the tail end of the mould only water vapour, the moisture that give off does not happen to push mastery of a skill or technique to pulling " destroy " the effect, make the certain function of its finished product is improved somewhat however instead. Because pull,perhaps be crowded shape the internal pressure power of modular antrum is very high, because the boiling point of this water also will exceed 100 ℃ , arrive at 110 ℃ , and even taller. Because this can think,use system of phenolic aldehyde of high temperature solidify at pulling crowded skill.

What phenolic aldehyde of 2) acerbity catalysis pulls crowded mould is anti-corrosive doubt
Pull in phenolic aldehyde crowded shape the industrialization of skill produces in, a doubt that encounters above all, be a mould is acid-proof corrode doubt. Producing in practice, require a few hours only commonly, the surface layer outside plating chromium can be corroded by acidity, fall off from the appearance of tool steel come down. Somebody tries in vain to attend through be inside phenolic aldehyde colophony appropriate inside agent of drawing of patterns, with handling a mould anti-corrosive doubt. But discovery of experimental positive result, apply inside after agent of drawing of patterns, chromic layer and tool steel mould still can come off come down, it is the hour that come off merely a few more outspread stopped. The patent skill of company of fiber conduit A/S, can be in do not damage the state of the mould falls, give those who produce a high quality to pull crowded shape. Company of Italian Tof glass and French Permali company, all also choose this patent to produce glass reinforced plastics of acerbity catalysis phenolic aldehyde is pulled crowded finished product. Be in Europe, choose acerbity catalysis phenolic aldehyde to pull crowded skill mostly, the phenolic aldehyde that also a few choose high temperature solidify pulls crowded skill.

Solidify of resinous of phenolic aldehyde of solidify of 3) high temperature reachs tall viscosity doubt
Be opposite to prevent colophony of acerbity catalysis phenolic aldehyde of the mould corrode doubt, somebody ever was used at pulling crowded skill to had done a test to colophony of phenolic aldehyde of high temperature solidify. Some phenolic aldehyde colophony, fall in 130-150 ℃ temperature can immediately solidify. For example the colophony layer that sand paper uses, 5 ～ 6min is passed below 130 ℃ temperature can solidify. Because this is pulled,squeeze shape the phenolic aldehyde colophony that skill chooses high temperature solidify is to have thoroughly perhaps. General, viscosity of resinous of phenolic aldehyde of high temperature solidify is taller, be 4 ～ 6pa about? S. If be,improve quality of finished product appearance, need to attend filling, viscosity still can increase, this will squeeze skill to bring the influence of unlucky to pulling. This kind of state, it is to pull crowded shape skill place does not expect. For this, somebody tries in vain look for all sorts of different monomer, with altering the chemical constituent of phenolic aldehyde constructs. A case with relatively successful meantime, it is to handle a benzene namely 2 phenol, increase rate of the solidify on the horse already, unapt increase viscosity of phenolic aldehyde resinous and dehydration amount.

Through making compound resin, in shape on front azimuth of the model, the model gives or take an injection below the effect in pressure. This is 1 kind play crowded skill way newly, not only leave out colophony impregnation chamfer, and increase insist to be as dry as a chip state. Method of this kind of skill also is called " give or take an injection pull crowded skill " (IP) . This kind gives or take an injection pull crowded skill method to have the following 2 advantages: It is colophony constituent burden relatively accurate, can use metric pump successional and metric, mix brought error in order to prevent craft; 2 it is colophony macerate chamfer turned whole sealing into means by open evolution type, dropped greatly of colophony spray perhaps quality, improved the working environment that pulls crowded skill next.
As above, phenolic aldehyde pulls crowded skill to still be put in the skill doubt with not little move, other, phenolic aldehyde pulls crowded finished product very not perfect still. Still be in now look for can accelerate solidify process 1 kind inside modular antrum, but won't produce the activator that corrodes the effect to mould rolled steel. Optimal is active below room temperature very low (and even without active) activator, so can colophony of outspread phenolic aldehyde stores mediumly in glue chamfer always. When practice is applied, attend activator to glue chamfer first inside, pass hydrolysis or other echo to decompose below the high temperature requirement that plays crowded model next, produce the comfortable sick at heart that gives resonant place to need. Divide this beyond, pass a test, below a few room temperature not of dissolve, probably of difficult dissolve, but in pull down requirement of high temperature of crowded model antrum, the weak base that solubility and active become very strong, it is to suit to use the activator that pulls crowded skill as phenolic aldehyde very.
Other, some produce the manufacturer often still is expressed to the inside and outside of stainless steel mould, undertake necessary hardness is handled, have the request of tall shining appearance and wear-resisting caustic sex in order to arrive. Apply play agent of crowded drawing of patterns, also can cut down acidity effectively to corrode the effect to pulling those who squeeze a mould.





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