Physico-chemical characterization of lignins from different sources for use in phenol-formaldehyde resin
In order to partially substitute the phenol and formaldehyde, aluminum, calcium and iron lignosulfonates, were used in the synthesis of phenol-formaldehyde resins
. Metal complexed lignosulfonates have also been used as reactive comonomers in the polycondensation reaction because they possess a reactive chemical potential, put into evidence by the presence in their structure of some functional groups like: phenolic and alcoholic hydroxyl, carbonyl, carboxyl, sulfonic.
The solventless resol type Phenol-formaldehyde resin
(under the trade name of PR-100) was produced by ABR Organics Ltd., Hyderabad, India.
Kajita and Imamura (1991) found that particleboards impregnated with phenol-formaldehyde resin
exhibited enhanced resistance to decay and termites.
The coatings are comprised of an ammonium salt of an epoxy resin, prepared by reacting phenol compound and epichlorohydrin, converting the product from into a cationic NH2 containing form by reaction with an amine, an amine adduct or ammonia, and converting the product into the corresponding the ammonium salt of the epoxy resin by adding an organic acid, a phenol-formaldehyde resin
, a polyketone resin having a number average molecular weight Mn of at least 500, and a mixture comprising water and organic solvent.
alphabund 07 tu 2221-1145-55778270-2012 or its analogs (the decision on the possibility of using in the conditions of jsc maz is made by technical experts on the basis of studying the technical documentation and conducting experimental work in existing production) 57 t, 4,126,800 rub2.
sfzh-3014 or analog 706 t, 22 592 000 rub
Tenders are invited for Purchase urea formaldehyde concentrate CK-85, a phenol-formaldehyde resin
or SFF-3014 analog, methanol of technical grade A GOST 2222-95
Formaldehyde-based adhesives, such as urea-formaldehyde and phenol-formaldehyde resin
, are the most commonly used adhesives in the wood composite industry in many countries (Roffael 1993).
Table 1.--Partial substitution of phenol with tannins of Uncaria gambier and Acacia catechu in phenol-formaldehyde resin
. Resin sample code P:T:F molar ratio (a) 5% Catalyst U1, Al 90:10:120 U2, A2 80:20:120 U3, A3 70:30:120 U4, A4 60:40:120 U5, A5 50:50:120 8% Catalyst U6, A6 90:10:120 U7, A7 80:20:120 U8, A8 70:30:120 U9, A9 60:40:120 U10, A10 50:50:120 11% Catalyst Ull, All 90:10:120 U12, A12 80:20:120 U13, A13 70:30:120 U14, A14 60:40:120 U15, A15 50:50:120 (a) P:T:F = phenol:tannin:formaldehyde; U = Uncaria gambler; A = Acacia catechu.
Also for impregnating applications is new GP 413D97, a low-VOC, waterborne phenol-formaldehyde resin
curing and bonding in steam-injection pressing part 2.