PVA Coating 088-20(mesh 80-160)

Structure and properties

PVA is an atactic material that exhibits crystallinity. In terms of microstructure, it is composed mainly of 1,3-diol linkages [-CH2-CH(OH)-CH2-CH(OH)-] but a few percent of 1,2-diols [-CH2-CH(OH)-CH(OH)-CH2-] occur, depending on the conditions for the polymerization of the vinyl ester precursor.
Polyvinyl alcohol has excellent film forming, emulsifying and adhesive properties. It is also resistant to oil, grease, and solvents. It has high tensile strength and flexibility, as well as high oxygen and aroma barrier properties. However, these properties are dependent on humidity, in other words, with higher humidity more water is absorbed. The water, which acts as a plasticiser, will then reduce its tensile strength, but increase its elongation and tear strength.
PVA has a melting point of 230 °C and 180–190 °C (356-374 degrees Fahrenheit) for the fully hydrolyzed and partially hydrolyzed grades, respectively. It decomposes rapidly above 200 °C as it can undergo pyrolysis at high temperatures.
PVA is close to incompressible. The Poisson's ratio is between 0.42 and 0.48.

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 for PVA 088-20 powder

Characteristics ：Good solubility, emulsification, and protection of colloid, affinity, and transparency
Main Use：
Emulsion of polyvinyl acetate emulsion (white latex),
Warp sizing of hydrophobic fibers, such as polyester fibers,
PVA film raw materials, labels, envelopes, stamps and other wet adhesives,
Seed coating, oil field cementing agent, soil improvers

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.

As the main strategic energy, petroleum occupies a pivotal position in the economic and military fields of various countries. As a result, countries have invested a great deal of money and personnel in the exploitation of crude oil. At present, the world in the drilling and oil production to actively develop and develop a variety of new, efficient, non-toxic and multi-functional chemical treatment agent, its product efficiency, quality, technical level, in fact, represents the development direction of drilling technology level. With the progress of science and technology, the treatment agent used by the past single inorganic development to the present multi-functional polymer organics. Organic matter mainly includes water-soluble polymers. Water-soluble polymers are widely used in the oil and gas extraction industries, from the 70 's to the current rate of almost doubling every ten years. Today, the world's total water-soluble polymers for oil and gas fields exceed 150,000 tonnes. They are mainly used in the process of cementing, completion, acidizing, fracturing, three oil recovery and other additives such as filtrate reducer, thickener, Flocculant, dispersant, mobility control agent and drag reducer.

PVA (PVA) system is a kind of non-ionic type filtrate reducing agent which is widely used in China and has unique advantages, such as the g60s of the Bohai Star Company in Tianjin. The temperature of the system can reach 95℃, which is higher than the temperature, the crosslinking key is destroyed and the filtrate loss performance is worse. In addition, the system has poor salt (NaCl) performance and usually no more than 5% salt resistance. In order to improve the temperature and salt resistance of PVA system, the chemical crosslinking method can be used to modify PVA, such as aldehyde or acid and other shrink mixture to make PVA's alcohol base condensation reaction to obtain some cross-linked PVA. Chemical crosslinking of PVA alone, do not need to borax, such as cross-linking agent, the temperature can reach 120 ℃, salt can reach 8%, filter loss can be controlled under 50mL.