Sinopec PVA SG 182

Polyvinyl alcohol (PVA) is a water-soluble synthetic polymer with excellent film-forming properties, surface activity, and strong adhesion to inorganic and cellulosic materials. Global annual PVA production is approximately 1.05 million tons, with Japan producing approximately 300,000 tons. Approximately 14,100 tons of this is used as a paper processing chemical, a surface sizing agent for plain paper, a sizing agent for coated and coated paper, a fluorescent brightener, an inkjet ink absorber, an adhesive for inorganic fillers, and a silicone sealant for release paper.   The paper business faces challenges like using different types of wood pulp and faster, bigger machines for making paper and printing. Because of this, they need better water-soluble polymers with special features. These polymers are important for making fancy specialty papers and papers used in tech. To adapt to these fundamental changes in the papermaking industry, Kuraray Japan has developed and mastered the properties of modified PVA with novel properties. This article will focus on two specialty PVA: the silanol-modified "R-series PVA" and the high-barrier "Exceval PVA" with the introduction of special hydrophobic groups. The two types will be discussed, along with their properties and applications in paper processing additives.   2. PVA Properties and Dissolution Methods Industrially, PVA is produced by polymerizing and then saponifying polyvinyl acetate. Its fundamental properties depend on its degree of polymerization and saponification. Most commercially available PVAs had a degree of polymerization of 200 to 4000 and a degree of saponification of 30% to 99.9% by mole fraction. The main varieties of PVA produced by Kuraray (Kuraray PVA) are shown in Tables 1 and 2. 3. Specialty Kuraray PVA To date, Kuraray has produced a variety of Kuraray PVAs with varying degrees of polymerization and saponification, which are used in a wide range of applications. As demand grows for better PVA and more varied uses, just tweaking the polymerization and saponification degrees isn't enough anymore. So, Kuraray PVA now comes with special groups added to give it extra function.   This article will introduce two types of functionalized PVA: the "R-series PVA," modified with silanol groups, and the "Exceval PVA (Exceval HR-3010)," which incorporates special hydrophobic groups for high barrier properties.   3.1 Silanol-Modified R-series PVA The R-series is a modified PVA with silanol groups. Table 3 lists the quality standards for the R-series products.     3.2 High Barrier Exceval PVA Exceval PVA is a PVA containing special hydrophobic groups. The introduction of hydrophobic groups enhances the crystallinity of the solid polymer, resolving the dilemma of achieving both high water resistance and stable aqueous solution viscosity, which is difficult to achieve with standard PVA. The use of PVA is increasing annually. PVA is usually used as a stabilizer in adhesives that need to resist water. But, when used in food packaging films, PVA doesn't block oxygen well when it's humid. Exceval PVA is also being developed as an improved material. In coated paper applications, Exceval PVA has also been successfully used when higher water resistance than PVA is required.   This article reports on the results of a new application study for Exceval PVA, specifically its use as an oil-resistant agent in food packaging. The product specifications of the Exceval PVA used in this study are shown in Table 4.   Table 5 shows that coating with Exceval PVA RS-2117 achieves air resistance roughly equivalent to that achieved with partially saponified PVA-217, while significantly reducing water absorption. Paper coated with partially saponified PVA exhibits higher air resistance. This is because the highly hydrophobic, partially saponified PVA has a lower surface tension in aqueous solution, inhibiting penetration into the paper. However, partially saponified PVA suffers from a significant reduction in water resistance. While Exceval PVA, modified with a special hydrophobic group, is fully saponified, it still exhibits the same permeability as partially saponified PVA, offering both improved water resistance and air impermeability.   R-series PVA contains highly reactive silanol groups, which improve adhesion to various inorganic materials. Using the R-series in inkjet media reduces the amount of polyvinyl alcohol used as a binder for silica particles, improving print quality. Even without a crosslinker, the R-series provides high water resistance. Exceval PVA is a modified, hydrophobic polyvinyl alcohol that offers excellent water resistance and gas barrier properties under high humidity conditions. The lower air permeability of coated paper provides a higher barrier to oils and greases than fully water-soluble polyvinyl alcohol, a property further enhanced when used with flake minerals. Exceval is now FDA-registered as safe for contact with food, opening doors for its use in food packaging paper.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com

Kami menggunakan alkoholisis parsial PVA-217SB (PVA080-22 dan PVA1780) dan pulp ramah lingkungan yang sangat efisien bersama-sama, dan menambahkan sejumlah pati. Kami melakukan percobaan pada beberapa varietas poliester-katun, yang tidak hanya meningkatkan kualitas poros pulp secara signifikan, tetapi juga sangat mengurangi biaya pulp. Kinerja pulp:Struktur kimia PVA bervariasi tergantung pada tingkat alkoholisisnya. PVA dengan tingkat alkoholisis 99,6% merupakan alkoholisis penuh, seperti halnya PVA-1799 (PVA 100-27) biasanya kita kerjakan dengan. Di sisi lain, PVA dengan tingkat alkoholisis 88% adalah alkoholisis parsial, seperti PVA-1788 (PVA 088-20) dan PVA-217SB. PVA yang sepenuhnya alkoholisis terutama memiliki gugus hidroksil dalam strukturnya, sedangkan versi yang sebagian alkoholisis mengandung beberapa gugus ester bersama dengan gugus hidroksil. Perbedaan ini membuat kinerjanya cukup berbeda. Misalnya, saat mencampur PVA yang terhidrolisis sebagian dengan PVA yang terhidrolisis sepenuhnya dan pati, rasio pati yang dibutuhkan tidak terlalu berbeda di antara keduanya. Umumnya, tidak boleh melebihi 70%, yaitu, rasio pencampuran pati terhadap PVA umumnya sekitar 7:3, untuk mendapatkan bubur dengan daya campur yang baik. Bubur ramah lingkungan Runli adalah cairan putih susu yang memiliki lebih dari 98% bahan yang efektif. Bubur ini memiliki viskositas 2 hingga 8 mPa·s pada 20℃ dan tingkat pH antara 7,5 dan 8,5. Bubur ini mengalir dengan baik, memiliki elastisitas yang baik, daya rekat yang kuat, mudah bercampur dengan bubur dan aditif lainnya, dan mudah dihilangkan setelah digunakan. Ringkasan:(1) Dari uji coba, pelacakan, dan analisis pengujian bubur Runli dan PVA yang dihidrolisis sebagian, kami menemukan bahwa laju aliran bubur stabil dan tidak mudah membentuk lapisan sizing pada suhu rendah. Gulungan keseribu halus, benang sizing terasa halus, dan ada lebih sedikit bulu yang diregenerasi.(2) Indikator benang ukuran baru jauh lebih baik daripada formula lama. Kami telah melihat penurunan besar dalam kerusakan alat tenun dan peningkatan yang signifikan dalam tingkat sumbu yang baik dan efisiensi alat tenun.(3) Penggunaan agen perekat Runli dan agen perekat PVA alkoholisis parsial (PVA-217SB) telah sangat mengurangi biaya perekatan. Situs web: www.elephchem.comWhatsapp: (+)86 13851435272Surel: admin@elephchem.com