Polyvinyl butyral resin (pvb) readme

Polyvinyl Butyral Resin (PVB) is a solvent-based resin synthesized by acetal reaction of polyvinyl alcohol (PVA) and butyraldehyde under the action of coal. PVB has good film-forming properties, and the film formed by PVB has excellent properties such as high transparency, elasticity, toughness, strength, oil resistance, flexibility and low-temperature impact resistance, and PVB has a special chemical structure, so It has excellent adhesion to glass, metal, ceramic powder, plastic, leather and wood. It also has good dispersibility for pigments and dyes and good compatibility with other resins. Because the PVB resin itself contains a large proportion of hydroxyl groups, it can be bridged with some thermosetting resins to improve the properties of chemicals and film hardness. Because PVB resin has various excellent properties as described above, it is widely used as an adhesive for safety glass interlayer film, rust primer, baking varnish, wood lacquer, printing ink, electronic ceramic and printed circuit board for automobiles and buildings. , metal and metal, metal and plastic between the adhesive, hot melt adhesive modifier, textile iron waterproof processing. New uses in various industries are also being continuously developed and applied.

PVB characteristics

The appearance of polyvinyl butyral (PVB) resin is a white spherical porous particle or powder having a specific gravity of 1:1; however, the packing density is only 0.20 to 0.35 g/ml.

Thermal Properties Thermal Properties

The glass transition temperature (Tg) of polyvinyl butyral (PVB) resin is from 50 ° C with low coincidence to 90 ° C with high degree of coincidence; this glass transition temperature can also be adjusted by adding an appropriate amount of plasticizer. Drop below 10 °C.

Mechanical properties Mechanical Properties

The coating film of polyvinyl butyral (PVB) resin has good water resistance, resistance and oil resistance (resistance to aliphatic, mineral, animal and vegetable oils, but not to castor oil). Because PVB contains high hydroxyl groups and good dispersibility to pigments, it is widely used in printing inks and coatings. In addition, its chemical structure contains both hydrophobic acetal and acetate groups and hydrophilic hydroxyl groups, so PVB and glass, metal, plastic, leather and wood have good adhesion.

The nature of the chemical reaction Chemical Reaction

Any chemical that reacts with the secondary alcohol also reacts with PVB. Therefore, in many PVB applications, it is often used with a thermosetting resin to bridge the hardening of the hydroxyl group of PVB. To achieve chemical resistance, solvent resistance and water resistance. Of course, depending on the type of the thermosetting resin and the mixing ratio with the PVB, a coating film having different characteristics (such as hardness, toughness, impact resistance, etc.) can be added.

Safety properties Safety Properties

Pure PVB is non-toxic and harmless to the human body. In addition, ethyl acetate or alcohol can be used as a solvent, so PVB is widely used in printing containers for food containers and plastic packaging in Europe and the United States.

Storage Safety Properties

As long as PVB is not in direct contact with water, it can be stored for two years without affecting its quality. PVB should be stored in a dry and cool place, and avoid direct sunlight. Avoid heavy pressure when storing PVB.

Dissolution characteristics Solubility

PVB is soluble in solvents such as alcohols, ketones, and esters, and the solubility in various solvents varies depending on the composition of the functional groups of PVB itself. In general, alcohol solvents are easily soluble, but methanol is more difficult to dissolve in high acetal groups; the higher the acetal group, the easier it is to dissolve in ketone solvents and ester solvents; PVB is easily soluble in alcohol ethers ( Cellosolve) Solvents; PVB is only partially soluble in aromatic solvents such as xylene and toluene; PVB is not soluble in hydrocarbon (hydrocarbon) solvents.

Viscosity characteristics of PVB solution

The viscosity of the PVB solution is greatly affected by the formulation of the solvent and the type of the solvent; in general, if the alcohol is used as the solvent, the higher the molecular weight of the alcohol, the higher the viscosity of the PVB solution; the aromatics such as xylene and toluene. Solvents and hydrocarbons (Hydrocarbon) solvents can be used as a diluent to reduce the viscosity of PVB solution; the effect of PVB chemical composition on viscosity is summarized as follows: in the same solvent, the same content of each base, the higher the degree of polymerization, the higher the viscosity of the solution; In the same solvent, the same degree of polymerization, the higher the acetal or acetate group, the lower the viscosity of the solution.

PVB dissolution method

When a mixed solvent is used, the dissolution step is first to put an aromatic solvent (such as xylene, toluene, etc.) or an ester solvent (such as n-butyl acetate, ethyl acetate, etc.) into the PVB while stirring, to be PVB. Disperse and swell, then add alcohol solvent (such as n-butanol, ethanol, etc.), at this time, the dissolution time can be shortened by heating; by using this dissolution method, it can avoid forming agglomerate (Lump) PVB (due to the formation of agglomerates) After the PVB, the dissolution time will be several times, so that the dissolution rate can be accelerated. Generally, the ratio of aromatic to alcohol solvent is 60/40-40/60 (weight ratio), and the PVB solution with lower viscosity can be adjusted. The solvent composition contains 2 to 3 wt% of water, which can improve the hydrogen bond strength of the alcohol solvent (Hydrogen bonding) to help the solubility of PVB.

Processing properties Processing Properties

Although the PVB resin is a thermoplastic plastic, it has almost no processability before the addition of the plasticizer, and the processability is very easy after the addition of the plasticizer. PVB can be compatible with phosphate esters such as TBP, TCP; phthalated esters such as DOP, DBP, BBP; and castor oil, triethylene glycol di-butyrate. The use of general coatings and adhesives varies the properties of the resin by adding a plasticizer to meet application requirements such as film softness, lowering the Tg point of the resin, lowering the temperature of the heat to the seal, maintaining softness at low temperatures, and the like.

Compatibility Compatability

PVB is compatible with a variety of resins such as phenolic resins, epoxy resins, Alkyd resin resins, and melamine resins. B-08SY, B-06SY and B-05SY with higher acetality can be mixed with nitrocellulose in any ratio. PVB and alkyd resins are partially compatible. General PVB and low molecular weight epoxy resins are compatible, while high molecular weight epoxy resins require high acetal PVB to be compatible.

PVB application

Epoxy resin additive

Additive/Rheology Agent

PVB can be used as an additive for epoxy resins such as composite adhesives to improve the rheology of epoxy resins and improve the toughness of epoxy resins.

Applicable specifications: B06HX, B08HX, B08SY

Phosphating primer

Wash Primer/Etch Primer/Shop Primer

PVB Wash Primer is one of the main applications of PVB. It is used for anti-rust treatment of steel, galvanized iron, aluminum products and other metal surface papers; common applications such as hull, aircraft, iron bridge, storage tank, automobile and locomotive engine surface primer, train Anti-rust treatment of highway guards, signage plates, and water tyrant steel.

The composition of PVB Wash Primer includes PVB, chromate, phosphoric acid, solvents and pigments. The anti-rust principle is that the phosphate membrane is firstly ablated on the metal surface, and the complex protective film is formed by the chromium ion Cr+2, PVB and phosphate, which has excellent water resistance and rust prevention effect. PVB Wash Primer can be divided into two types: One-Pack Primer and Two-Pack Primer:

1 single liquid antirust primer

Single-liquid anti-rust primer, because it has a small amount of phosphoric acid, it has a long storage time and can be used for special applications such as impregnation. It has good preservability and is convenient to use. It can be applied alone or in combination with other resins. Zinc, aluminum, glass, wood and other materials have good adhesion, which can achieve rust, water and chemical resistance and improve the bonding strength of topcoat and substrate. Common applications include metal (especially aluminum foil, aluminum) printing inks, electro-zinc protective films, and glass colored inks.

2 two-liquid antirust primer

Generally, metal anti-rust primers are mostly coated with this type. Because of the large amount of phosphoric acid, water resistance and weather resistance are better, but the storage time after mixing is shorter, about 8 hours.

Applicable specifications: B03HX, B05HX, B08HX

Automotive refinish

Automotive Repair/Retouch Lacquer

The automotive steel plate repair primer can be used to achieve excellent adhesion strength by using a coating formulation consisting of PVB resin/phenolic resin/epoxy resin.

Applicable specifications: B03HX, B05HX, B05SY

Ceramic Adhesive Binders for Ceramics

Due to its special particle porosity and surface properties, PVB can be quickly dissolved in most polar and non-polar solvents, and gives the embryos considerable strength and softness. In addition, PVB and Various commonly used solvents are compatible with plasticizers and can be completely burned during the sintering process. Therefore, PVB is often used in ceramic blade forming (Tape Casting) or other ceramic-related processes (such as extrusion, injection, granulation, etc.). Used as an adhesive.

Applicable specifications: B05SY, B06SY, B08SY, B03HX, B05HX, B06HX, B08HX

Brake pad adhesive affinity in Blake-lining Binder

PVB can improve the toughness of phenolic resin, so PVB and phenolic resin can be used as a contact adhesive.

Applicable specifications: B08HX, B17HX

Can coating/painting. Metal foil coating

(Cardboard Packaging Impregnation)

After coating PVB on metal sheets or metal foils such as aluminum, copper, lead, etc., it can increase its strength and water resistance, and has the function of surface protection. For some metal printing projects, it can be coated with PVB to increase its printability. . PVB can be used for aluminum foil coating or metal can coating of food packaging.

Generally, thermosetting resin coating (such as phenolic resin, melamine resin) can be used in combination with PVB to improve coating uniformity, reduce pinhole occurrence, and increase the bonding strength, cross-linking resistance, toughness and compatibility of the coating film. .

Applicable specifications: B03HX, B05SY, B08SY

Candle coating Candle Coating

PVB and appropriate amount of plasticizer can be adjusted with a candle impregnated glue to reduce the vertical flow of wax oil; in addition, the colorant can be made into a candle paint.

Applicable specifications: B08HX, B08SY

Packaging cardboard impregnation

Cardboard Packaging Impregnation

PVB can be dissolved in an alcohol solvent to form a coating or paint for packaging paperboard, which can impart water resistance and tortuosity to the paperboard. Common applications such as cigarettes, wine boxes, etc.

Applicable specifications: B03HX, B05HX, B08MX, B08SY

Cement paint Soncrete Paints

The use of PVB and phenolic resin in combination to make a cement surface primer can prevent cementitious exudation and protect the topcoat, increasing the service life of the topcoat. Applicable specifications: B05HX, B08HX

Printing Inks Printing Inks

Due to its excellent film-forming properties, PVB, adhesive, flexible, and can be used as an adhesive for Gravure Printing Inks, letterpress, and flexographic printing inks; in addition, PVB is soluble in lower boiling solvents. For fast printing.

Applicable specifications: B03HX

Masterbatch adhesive

Binder for Predispersed Pigments

Low viscosity PVB B03HX can be used in the production of disperse pigments.

Powder coating flow aid

Flow Agent in Powder Coatings

Since the powder coating does not require any solvent, it can save solvent, storage and transportation costs, energy used for solvent evaporation in traditional coatings, and avoid air pollution. In recent years, there has been an increasing trend in application; epoxy resin-based powder Coatings, PVB addition can increase the edge-covering effect and the strength of the coating.

Applicable specifications: B03HX, B05HX, B06HX, B08HX, B05SY, B06SY, B08SY

Textile sizing agent,alcoholic

Due to the transparency of PVB itself, it is also resistant to light and aging. It has strong adhesion to nylon, cotton, wool, polyester fiber, glass fiber and other difficult products, and the film has good flexibility and good hand feeling. If it is reflected with a thermosetting resin such as urea resin, phenolic resin, melamine resin, etc., it can achieve long-term effective purpose and impart waterproofness. Anti-pollution, good appearance, etc., can be used for curtain fabrics, shower curtains, tablecloths, chair covers, rain, overalls and other processing.

Applicable specifications: B08HX, B17HX

Gear coating / oil resistant coating

Gear Paints Resistant

Because PVB itself has good oil resistance, the coating film formed by baking and crosslinking with thermosetting resin has good adhesion and resistance to gasoline and lubricating oil, and can be used inside a fuel tank or other metal parts requiring oil resistance.

Applicable specifications: B03HX, B05HX, B06HX, B08HX, B05SY, B06SY, B08SY

Heat seal 凡立水 Heat Sealable Lacquers

Paper, metal foil or other materials can be applied to the heat sealing of packaging materials after being coated with PVB glue. At the same time, the gloss of the packaging material can be improved, and special effects can be obtained by embossing. The heat sealing temperature depends on the PVB softening point of various polymerization degrees, and a plasticizer may also be added to lower the heat sealing temperature.

Applicable specifications: B03HX, B05HX, B06HX, B08HX, B05SY, B06SY, B08SY

Hot melt adhesive, metal bonding

Hot Sealable Lacquers

PVB can be used as a hot melt adhesive by adding plasticizers, waxes, flow-assisting resins, antioxidants, and the like. It is also possible to add a colorant or other additive suitable for subsequent application in the case of difficult adhesion or where transparency is required, such as metal foil bonding.

Applicable specifications: B03HX, B05HX, B06HX, B08HX, B05SY, B06SY, B08SY

Anti-brittle protection coating Implosion Protection

PVB has good adhesion to glass. The glass product is coated with PVB glue to form a colorless transparent film, which can prevent glass products from rupturing and damaging. The application is like coating inside the bulb.

Applicable specifications: B03HX, B05HX, B06HX

Leather coating Leather Coatings

PVB is blended with nitrocellulose, plasticity, pigments, etc. to form a leather coating, which provides excellent adhesion and long-term flexibility and prevents cracking and peeling of the coating film. Mixing nitrocellulose with PVB can produce a strong adhesion to leather and can be made into leather leather adhesive.

Applicable specifications: B05SY, B06SY, B08SY

Temporary protective film

Strippable Packaging Lacquers

Low-viscosity PVB B03HX, B05SY can be combined with a plasticizer to make a tearable temporary protective film.

Tape adhesive

Magnetic Recording Tape Coatings

Use of PVB for excellent dispersibility and adhesion of magnetic powder, can be used for advanced tape adhesive

Applicable specifications: B03HX, B05HX, B06HX, B08HX, B05SY, B06SY, B08SY

Nitrocellulose varnish Nitrocellulose Lacquers

PVB and nitrocellulose are partially compatible, so the combination of PVB and nitrocellulose can improve the hardness of PVB coating and improve the adhesion of nitrocellulose.

Paper 凡立水 Paper Lacquer

After the paper is coated with the glue of the PVB/plasticizer system, it can increase the gloss of printing in addition to heat sealing and oil resistance.

Applicable specifications: B03HX, B05HX, B06HX, B08MX, B05SY, B05SY, B06SY, B08SY

Plastic product topcoat / gloss protective coating

(Surface Finishes/Glossy Protection Paints)

In addition to alcohol solvents, most solvents will erode the surface of plastic products; while PVB is very soluble in alcohol solvents, it is most suitable for coatings on the surface of plastic products such as PS, PMMA, PC, ABS. The surface of the plastic product is coated with PVB, thereby protecting the film from increasing strength, gloss or dyeing adhesive.

Applicable specifications: B03HX, B05HX, B06HX

Pressure sensitive adhesive

Pressure Sensitive Adhesive

Used in OPP or PVC pressure sensitive tape.

Applicable specifications: B03HX, B05HX, B06HX, B08HX, B17HX

Copper foil adhesive

Printed Circuit Board Adhesive

When PVB, phenolic resin and epoxy resin are used together, copper foil adhesive is applied to copper foil, and then laminated with impregnated paper to form a laminate to obtain excellent heat resistance, peel strength and dielectric properties. nature.

Applicable specifications: B10TX, B11TX, B12TX

Reflector Sticker Reflecting Sheet Binder

It is suitable for mirror adhesion with PVB and amine-based resin.

Applicable specifications: B10TX, B11TX, B12TX, B17HX

Safety helmet / helmet

Safety Helmets for Work and Sport

Kevlar fiber or other fiber is impregnated and dried with PVB and phenolic resin in glue or PVB modified glue, and then hot-pressed to produce a safety helmet with light weight and good punchability.

Applicable specifications: B08HX, B17HX, B08SY

Non-woven adhesive

Binder for Nonwoven Cloth

PVB has good adhesion strength and softness for most fibers so PVB can be applied with non-woven fabrics.

Applicable specifications: B03HX, B05HX, B06HX

Hot press forming adhesive Binder for Compression

PVB has good adhesion to most of the fibers and powdery substances. Therefore, PVB is uniformly mixed with these materials, and various articles are produced by hot press forming.