100-70 Fully Hydrolyzed Polyvinyl Alcohol Used As Well-Cementing Agents

Physical-chemical properties

Grade	Hydrolysis, /%	Viscosity, /(mPa.s)	Volatiles, /%≤	Ash, /%≤	pH	Purity, /%≥
088-05	87.0-89.0	4.5-6.0	5.0	0.5	5-7	93.5
098-05	98.0-99.0	5.0-6.5	5.0	0.5	5-7	93.5
098-08	98.0-99.0	9.0-11.0	5.0	0.5	5-7	93.5
088-15	87.0-89.0	15.0-19.0	5.0	0.35	5-7	94.0
098-15	98.0-99.3	19.0-23.0	5.0	0.5	5-7	94.0
088-20	87.0-89.0	20.5-24.5	5.0	0.4	5-7	93.5
100-30	99.0-100.0	27.0-34.0	5.0	0.5	5-7	94.0
088-35	87.0-89.0	29.0-34.0	5.0	0.3	5-7	93.5
100-50	99.0-100.0	43.0-53.0	5.0	0.5	5-7	94.0
088-50	87.0-89.0	45.0-55.0	5.0	0.3	5-7	93.5
100-60	99.0-100.0	58.0-68.0	5.0	0.5	5-7	94.0
088-60	87.0-89.0	56.0-68.0	5.0	0.35	5-7	94.0
100-70	99.0-100.0	68.0-78.0	5.0	0.7	5-7	94.0
100-80	99.0-100.0	80.0-98.0	5.0	0.7	5-7	94.0
100-40H	99.0-100.0	35.0-45.0	6.5	2.5	7-10	86.5
100-50H	99.0-100.0	45.0-55.0	6.5	2.5	7-10	86.5

Application

Type	Application
	Fiber Processing			Paper processing
	staple yarns	filament	Post processing	surface sizing	pigment binder
100-70			☆

Type	Application
	Binders			Stabilizer
	book paper bond	Re-wet adhesive	plywood adhesive	Vinyl Acetate emulsion polymerization	suspension polymerization of vinyl chloride
100-70	◎	◎	◎

Type	Application
	Molding materials&Other
	PVB	Film or sponge, soil improvement	soil improvement	ight-sensitive glue	medicine or cosmetics	building materials with additives
100-70

Notes:1. ◎: general use  2. ☆: Use under the situation  3. ●: powder more suitable.

Chemical Reactions

Polyvinyl alcohol reacts in a manner similar to other secondary polyhydric alcohols. Esterification reactions of polyvinyl alcohol can be carried out with a number of compounds. A commercially important reaction is the formation of tackified PVOH using boric acid or borax to form cyclic esters. This reaction is very sensitive to pH, and an insoluble gel is formed above 4.5-5.0. Other esterification reactions include those with chloroformate esters to yield poly(vinyl carbonate), urea to yield a polymeric carbamate ester, and with isocyanates to form substituted carbamate esters. Another commercially important reaction is acetalization with aldehydes. Polyvinyl butyral is produced by the reaction of polyvinyl alcohol with butyraldehyde and is used in the production of the inner adhesive film for safety glass. Reaction with dialdehydes such as glyoxal or glutaraldehyde can be used to crosslink polyvinyl alcohol. Other reactions include ethoxylation, propoxylation, and cyanoethylation.

Crosslinking

All polyvinyl alcohol grades are cross-linkable through their secondary hydroxyl functionality. Even lower hydrolysis grades – which are so exceptional on paper surfaces for oil, grease and organic solvent resistance and Gurley porosity – can be made water resistant. Degrees of water resistance vary from grade to grade. The table below shows the effect of glyoxal, a commonly used and favored crosslinker for polyvinyl alcohol. They include several classes: (1) aldehydes, of which glyoxal, a simple dialdehyde, is the most common, along with higher aldehydes, such as gluteraldehyde and hydroxyadipaldehyde; (2) thermosetting resins, such as urea formaldehyde and melamine formaldehyde; and (3) salts of multivalent anions, such as zirconium ammonium carbonates. More recently, there has emerged a growing interest in zero-formaldehyde or low-formaldehyde-type crosslinkers. Two such products are Polycup 172, a water-soluble, polyamide-epichlorohydrin-type resin, and Bacote-20, a zirconium ammonium carbonate salt.

Customization

HUAMAO® can customize according to customer demand, production of goods.
1. HUAMAO® can customize the packaging according to the customer's requirements.
2. HUAMAO® can process various sizes (mesh 80 100 120 160 etc.).
3. HUAMAO® can produce different physical forms of PVA: flocculent, flaky, powder.
4. HUAMAO® can produce PVA which is the special technical index (alcoholysis degree and viscosity), according to the customer's demand.

Polyvinyl alcohol has excellent stability, crosslinking performance, thickening performance and biodegradability, etc., can be widely applied to oil field, for example, can be used as thickening agent in water injection, can be used as a thickener of acid to delay and rock the work fluid and reduce the loss of acid The combination of the cross-linking agent with the cement is used for fracturing fluids in cementing and sealing wells.
PVA as water slurry filtrate reducing agent:

PVA can be used in the production of the oil well slurry filtrate reducing agent, and other oil well cement admixtures joined cement, forming latex cement system. The latex cement admixture system is one of the effective methods to realize the performance of fine slurry, to ensure cementing quality and to protect oil and gas well productivity. General preparation methods of PVA latex: Commonly used boric acid, titanate, chromic acid or the corresponding inorganic salts and PVA mixed with the crosslinking modification, can also be used with PVA to form a covalent bond or other cross-linking agents to achieve the modified purpose. In the process of mixing latex polymers with cement, cement hydration products and latex polymers are bonded by latex particles to form a reticular structure between the hydrated cement and the hydrated cement, which not only disperses the stress concentration of the slurry, but also increases the deformation, and thus enhances the crack resistance, impermeability of polymer latex cement stone Acid and alkali resistance, corrosion and other properties.

PVA as anti-sloughing agent for drilling mud:

As drilling mud anti-sloughing agent: The mud Shale in the deep stratum is affected by the overlying formation pressure, horizontal direction stress and formation pore pressure, when the wellbore is drilled, it destroys the original stress balance of the stratum and causes the redistribution of stress around the wellbore. If the stress of the rock around the wellbore exceeds the strength of the shale itself, the shear damage will occur, resulting in a wellbore instability (well collapse). PVA can produce both intermolecular forces on the clay surface, can also form physical adsorption through hydrogen bonding, while PVA is a surfactant, the molecular structure has two affinity, its hydrophilic end and clay minerals form physical adsorption, the hydrophobic end toward the drilling fluid, so as to prevent drilling fluid filtrate continue to invade shale, Thus the effect of preventing wellbore destabilization is achieved.