PVB resin B-05SY

Polyvinyl butyral resin is widely used in coatings, inks, adhesives, ceramic slurries, and films due to its excellent film-forming properties, adhesion, impact resistance, and good compatibility with various materials. Different application scenarios place different requirements on the viscosity, functional group ratio, and solubility of PVB. Therefore, understanding the structural characteristics and application directions of different specifications of PVB is key to achieving stable formulations and cost control.   1. Understanding PVB: Chemical Structure Determines Physical Properties PVB is a synthetic resin produced by the condensation reaction of polyvinyl alcohol and butyral under acid catalysis. By precisely controlling three core chemical indicators, the applications of different grades are defined: Butyral content: Determines the resin's hydrophobicity and solubility in non-polar solvents. Hydroxyl content: Affects the resin's polarity, adhesive strength, and reactivity with crosslinked resins. Acetate content: Although present in lower amounts, it has a fine-tuning effect on the resin's softness and dissolution rate.     2. PVB Specification Classification and Viscosity Range Division From an industrial application perspective, the core distinguishing criteria for PVB mainly focus on viscosity grade and functional group composition. The CCP PVB series can be broadly classified into three categories based on solution viscosity: low viscosity, medium viscosity, and high viscosity. Low viscosity grades, such as PVB Resin B-02HX, PVB Resin B-03HX, PVB Resin B-04HX, PVB Resin B-05HX, and PVB Resin B-05SY, typically achieve good flowability in low-solids systems, making them suitable for systems with high workability requirements, such as spray coatings, low-viscosity inks, or high-filler dispersion systems. These products help improve pigment wetting and application uniformity while ensuring film continuity. Medium viscosity grades (such as CCP PVB B-06HX, CCP PVB B-08HX, CCP PVB B-06SY, and CCP PVB B-08SY) achieve a good balance between flowability and structural strength, making them more suitable for general-purpose coatings, composite inks, and adhesive systems. They provide stable adhesion and mechanical strength under normal solids conditions and are frequently used in industrial formulations. High-viscosity grades such as Changchun PVB B-14HX,Changchun PVB B-17HX,Changchun PVB B-18HX,and Changchun PVB B-20HX are suitable for applications requiring high film strength, impact resistance, or cohesiveness, such as high-performance adhesive layers, functional coatings, and structural adhesives. These products are typically used in high-solids systems, requiring relatively stricter dissolution and dispersion conditions. Besides viscosity, the performance of PVB is also highly dependent on the ratio of butyraldehyde, hydroxyl, and acetate groups in its molecule. In the CCP PVB series, most HX-type products have a relatively balanced butyraldehyde and hydroxyl content, resulting in good solubility in various polar solvents while maintaining good adhesion and water resistance. In contrast, the SY series (such as PVB resin B-05SY, Changchun PVB B-06SY, and Changchun PVB B-08SY) are high-butyraldehyde and high-acetal-degree products. These PVBs have a lower proportion of polar hydroxyl groups in their molecular chains, thus exhibiting better compatibility in non-polar or weakly polar solvent systems, and are particularly suitable for formulations based on toluene and ester solvents. Its film-forming structure is more compact, which helps improve water resistance and chemical stability.   3. Typical Application Scenarios In coatings and inks, low to medium viscosity HX series PVB is often used as a pigment dispersant or film-forming resin. Its good compatibility allows it to be used synergistically with a variety of resin systems, while reducing the dependence on additives in the formulation. In the printing ink field, medium viscosity PVB achieves a better balance between adhesion, flexibility, and drying speed, making it particularly suitable for surface treatment of metal, plastic, or composite substrates. For adhesives, high viscosity PVB or SY series products are more advantageous. Their higher cohesiveness and film strength help improve the durability and impact resistance of the final bond layer. In some formulations, different grades of PVB can also be mixed to finely adjust the system viscosity and application properties.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com

Butvar brand resins generally are soluble in alcohols, glycol ethers, and certain mixtures of polar and nonpolar solvents. In general, Butvar B-98 (PVB Resin B-05SY) resin will show the same general compatibility characteristics as Butvar B-90 (PVB Resin B-02HX) and, therefore, should prove advantageous where physical and chemical properties of B-90 are desired but lower solution viscosities are necessary. The same is true for Butvar B-79 in relation to Butvar B-76.     The lower hydroxyl content of Butvar B-76 and Butvar B-79 permits solubility in a wider variety of organic solvents as compared to the other grades of Butvar. One notable exception, however, is the insolubility of Butvar B-76 and Butvar B-79 in methanol. All other types of Butvar contain sufficient hydroxyl groups to allow for solubility in alcohol and in hydroxyl-containing solvents. The presence of both butyral and hydroxyl groups permits solution in mixtures of alcohol and aromatics. Viscosities of Butvar resin solutions containing mixed solvents depend on the ratio of alcohol to aromatic. Viscosity curves for Butvar B-76, Butvar B-90, and Butvar B-98 in Graph 2 show minimum points in the general vicinity of 50% alcohol: 50% aromatic.     A common solvent for all of the Butvar resins is a combination of 60 parts toluene and 40 parts ethanol (95%) by weight. For compositions of Butvar, methyl alcohol will tend to give the lowest viscosity and, therefore, will permit the use of higher solids when used as a component of a solvent blend. When much more than 10% to 15% alcohol is used in a formulation for spray application, blushing may result. They are useful as starting points in the development of solvent blends for the other types.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com

Polyvinyl butyral resin (PVB) is a solvent-based resin synthesized by acetalization reaction of polyvinyl alcohol (PVA ) and butyraldehyde under the action of coal catalyst     General characteristics The appearance of PVB is white spherical porous particles or powder, and its specific gravity is 1:1; but the filling density is only 0.20~0.35g/ml. Thermal properties The glass transition temperature (Tg) of PVB ranges from 50℃ for low overlap to 90℃ for high overlap; this glass transition temperature can also be adjusted to below 10℃ by adding an appropriate amount of plasticizer. Mechanical properties PVB has excellent film-forming properties and gives the coating film quite good properties such as warp strength, tear strength, abrasion resistance, elasticity, flexibility, gloss, etc.; it is especially used in bonding safety glass interlayers, making the glass have strong impact resistance and penetration resistance, and it is still not replaced by other materials. Chemical properties PVB coatings have good water resistance, resistance and oil resistance (resistance to aliphatic, mineral, animal and plant oils, but not castor oil). Because PVB contains high hydroxyl groups and has good dispersibility for 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 has good adhesion to glass, metal, plastic, leather and wood. Chemical Reaction Properties Any chemical that can react with secondary alcohols will also react with PVB. In a lot of PVB applications, it's common to mix it with thermosetting resins. This helps to strengthen the hydroxyl groups in PVB, making it more resistant to chemicals, solvents, and water. Depending on the type of thermosetting resin and how much you mix with PVB, you can create coatings with different features like hardness, toughness, and impact resistance. Safety Properties Pure PVB is non-toxic and harmless to the human body. In addition, ethyl acetate or alcohol can be used as solvents, so PVB is widely used in printing inks for food containers and plastic packaging in Europe and the United States. Storability Properties As long as PVB is not in direct contact with water, it can be stored for two years without affecting its quality; PVB needs to be stored in a dry and cool place and avoid direct sunlight. Avoid heavy pressure when storing PVB. Solubility Properties PVB dissolves in alcohol, ketones, esters, and some other solvents. The solubility in various solvents varies according to the functional group composition of PVB itself. Please refer to CCP PVB Solvent Solubility Table. Basically, alcohol solvents mix well, but methanol doesn’t blend as easily with substances that have a lot of acetal groups. The more acetal groups there are, the easier it is to mix with ketone and ester solvents. PVB has good solubility in alcohol ether solvents, like Cellosolve. It only partly mixes with aromatic solvents such as xylene and toluene, and it won’t mix at all with hydrocarbon solvents.   PVB (such as Changchun PVB) has good film-forming properties. The coating formed by PVB (Butvar B-72 & PVB WWW-A-20) has excellent properties such as high transparency, elasticity, toughness, strength resistance, oil resistance, flexibility and low-temperature impact resistance.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com  

Yellowing of the Polyvinyl butyral resin (PVB) at the edges of laminated glass is a rare but important quality issue. You usually see it as two yellow spots about 5 cm wide along the edges. Since this tends to happen often, many customers have complained, leading to some losses for the company. This study investigates the cause by checking the production steps, running tests, and using a microscope to pinpoint the issue and find a solution.     Cause AnalysisMaking laminated glass involves several steps: cutting, edging, lamination, autoclave treatment, and finally packaging, storing, and transporting. We've noticed that the yellowing mainly occurs where the glass vials touch the rack base, specifically in a 5 cm area. This yellowing doesn't appear right after autoclaving; it tends to show up during packaging and storage. Here are a few initial ideas about what might be causing it: Local PVB Aging Due to High Temperature: We tried using glass on a new rack that had a trimmed rubber base and deeper grooves, and there was no yellowing after a day. So, that's not the problem. Plastic Film Aging Contaminating PVB: We tried switching the film with adhesive tape, but there was still yellowing, which means the film isn’t the main culprit. Migration of Yellowing from Rubber Material: Seeing that putting glass on a clean rack stopped it from turning yellow makes it pretty clear that the old rubber parts are the cause of the discoloration.   Testing and Mechanism StudyWe used FTIR and GC-MS to check out the yellowed PVB (Resin B-05SY & Butvar B-98) and rubber materials. The findings included: There weren't any major differences in the composition of PVB or rubber. C-MS detected extra organic compounds in the yellowed PVB, which are rubber additives. These substances migrated to the PVB due to a blooming effect from the EPDM rubber, causing the yellow spots. Optimization SolutionsBased on our findings, we suggest three solutions: Prevent Blooming Migration: Add an inorganic barrier between the glass and rubber. Maintain Rubber Base: Trim aged surfaces periodically. Conclusion Identifying the issue has been really beneficial. This approach could also help address yellowing problems in other materials, like Ethylene Vinyl Acetate (EVA), which might spark some useful ideas for related issues.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com