PVB

Product Description

Structural formula of PVB

Terms of technology
1. Appearance: White or light yellow solid granules or powder
2. Indexes of technology
Notes: We also accept other specifications as required by clients. For example, some customer may require the transparency reach 92% and ash content is lower than 0.08%.

Major Properties:
1. Physical properties:
A: The appearance is flowing white granular powder, with density of 0.17-0.4g/cm3 temperature lowering to 60, and vitrification temperature being 57, and softening temperature being 60-75.
B: Dissolution: PVB is not soluble in water but in many organic solvents such as alcohol, ester, and ketone. Furthermore, it can mix with many kinds of plasticisers, such as PBT, Fatty Acid Esters and etc. The film formed by them has strong adhesive force, good transparency, water-resistance, and light-resistance. In addition, it can be mix with various resins such as phenolic resin, Urea Resin, epoxy resin, and natural resins and etc.
C: It is resistant to inorganic acid and fat as well as excellent insulation, climate-resistance, water-resistance, and strong aging-resistance.

2. Chemical Properties:
(1)PVB is stable in chemical nature. It can decompose in the acid or alkali.
(2)It starts to decompose when the temperature reaches 100. It decomposes completely at 200-240.
(3)It can undertake Ethylene saponification reaction, hydroxy esterification reaction,
A: Hydrolyzation will occur in dilute acid, when there are some double bonds upon the cross junction between the molecules, with the Acetic Acid hydrolyzes further.
B: It will produce transparent solvent when heated, at the same time aldehyde comes out of it.
C: It can neutralize the free acid, and improve the stability of resin when heated in dilute alkali of 1%.
D. If it boils with alkali of 3%, the acetic acid will further hydrolyze.
E. Salt in it works as catalyst in acetal process. Too much of salt will harm the process for example Zncl2. Cacl2. Alcl2. NaHso3.
4)Reaction with organic matters
A, With the alcohol as solvent, PVB will emit some of aldehyde under the function of phosphoric acid
B. PVB in the glacial acetic acid can produce ester in the reaction with ACETIC ANHYDRIDE with Zncl2 as catalyst.
C. PVB emits lots of hydroxide in the alcohol with acid in it.
Paints: As there are many advantages for PVB such as high binding force, anti-coldness, oil-resistance, anti-wearing, and good anti-corrosion, It has been widely applied in the following aspects:
(1)Wood paints
(2)Metal paints
(3)Bottom paint of metal
(4)Metal ink
(5)Paint of Metal tank.
(6)Dope for braising and plating in vacancy.
(7)Dope for concrete: PVB can improve the anti- wear of paint film.
(8)Dope of water-proof.
(9)Dope for leather.
(10)Varnish protecting dope.

3. Adhesive: PVB contains (hydroxy, acetyl and aldehyde), possessing strong felt nature, so it can be made into all kinds of adhesive. (1)Adhesive of glass: PVB has strong binding force, proper spring and softness. So it can be used to conglutinate glass.
(2)Adhesive of metal.
(3)Conglutination of enameled wire loop.
(4)Heat sealing adhesive.
(5)Adhesive for transfer label trademark.
(6)Film for conglutination.
(7)Press-sensitive adhesive.
(8)Other adhesives.

4. The application in fiber processing:
(1)Smearing
(2)Fiber treatment agent
(3)Printing and dyeing of the fabrics
(4)Arrangement of other resins
(5)Making