Laboratory 011

(Dispersive Vinyl Acetate Containing Polymers and Vibrodamping Materials).

Laboratory manager - Mr. Alexandre G. Rodionov, tel. (812) 140-73-08, (812) 540-89-86. E-mail

List of Standard Services of the Laboratory.

• search of ways for the preparation of vinyl acetate containing polymers, their aqueous dispersions or solutions in organic solvents with prespecified properties (structures);

• studies of synthesis kinetics;

• preparation of structure -properties correlations;

• development of the process for commercial production of vinyl acetate containing polymers, their aqueous dispersions or solutions in organic solvents;

• production of experimental, pilot and commercial lots of vinyl acetate containing polymers, their aqueous dispersions or solutions in organic solvents to be tested by customers;

• design of commercial plants to produce vinyl acetate containing polymers, their aqueous dispersions or solutions in organic solvents;

• start up and commercialization of mix of grades by commercial plants to produce vinyl acetate containing polymers, their aqueous dispersions or solutions in organic solvents;

• preparation of normative and technical documentation for commercial production (manuals, technical conditions, sanitary and other certificates).

The following products can be used as comonomers:

• internal (chemically bound) plasticizers, e.g. ethylene, ethers of acrylic, maleic, fumaric acids;

• cross-linking agents (used to increase chemical, heat and weather resistances of coatings made of vinyl acetate containing polymers);

• structural modifiers of polyvinyl acetate which improve prespecified properties, e.g. adhesion or cohesion ones.

From the point of view of structure they can be statistical, graft or block copolymers and their mixtures.

Below you will find some examples of the developments made by the laboratory in the sphere of aqueous dispersions of vinyl acetate containing polymers.

Product of emulsion copolymerization of vinyl acetate and ethylene in the presence of protective colloid, surfactant or their mixtures. Ethylene content of the copolymer - 10-30% mole.

SVED is a white viscous liquid with particle size from 0.1 to 1.0 mkm.

SVED can be used by all industries where polyvinyl acetate dispersions are used. Applications of SVED are as follows:

• SVED films are flexible, they do not need external plasticizers;

• SVED paints have high adhesion, they are resistant to wear and weather

• SVED has good compatibility with fillers (clay, calcium carbonate etc), it can be used to prepare mastics, compounds for floors;

•  SVED has excellent adhesion to many materials, it can be used to adhere PVC, linoleum and other materials;

• fine dispersive SVED (particle size below 0.5 mkm) are used to produce thermoplastic materials for inner parts of footwear, to produce high grades of paper;

• rough dispersive SVED is non-toxic, it is used as a bonding agent for coating compounds for natural hard cheeses.

Product of emulsion copolymerization of vinyl acetate and dibutyl maleinate in the presence of protective colloid or surfactant.

Similar to SVED it forms flexible films on drying, plasticizers are not used.

Rough dispersions of the copolymer are used for the production of aqueous emulsion paints, as adhesives for printing industry, for adhesion of non-weaven reinforcing materials, for coating compounds for natural hard cheeses.

Fine dispersions are used to produce thermoplastic materials for inner parts of footwear, high grades of paper, aqueous emulsion paints.

Product of iulsion copolymerization of vinyl acetate and butyl acrylate and/or 2-ethyl hexyl acrylate in the presence of protective colloid, surfactant or their mixture.

It is used to produce adhesives, adhesive tapes, to adhere paper and polyethylene, as a bonding agent for weather resistant paints.

• search of ways to produce vibrodamping materials with prespecified properties;

• development of recipes and processes for vibrodamping materials with prespecified properties;

• preparation of structure - properties correlations;

• study of the mechanism and kinetics of synthesis of specific vibrodamping polymers;

• development of the commercial process to produce vibrodamping materials;

• production of experimental, pilot and commercial lots of vibrodamping materials to be tested by customers;

• development of normative and technical documentation to produce products.

Commercial polymers or high molecular substances based on commercial monomers (vinyl acetate, olefines, ethers of acrylic, methacrylic, maleic acids, styrene, fluoromonomers etc) can be used as a polymeric basis. The process is a standard commercial one.

List of competitive vibrodamping products developed by laboratory 011 is as follows:

vibrodamping mastic materials of Adi group;

vibrodamping film materials of VPS and VPA groups;

construction polymeric materials with higher level of mechanical losses (laboratory development).

The above materials and their production process are protected by 30 author's certificates and patents of USSR and RF.

Vibrodamping mastic materials of Adi group are more forward commercial materials. Below you will find some important properties.

Hard damping coatings made of Adi vibrodamping mastic materials are used by ship building industry as one of important elements of the complex to decrease vibrations and noise. 15-year commercial production experience allowed to select 4 basic grades of vibrodamping mastics, now they are basic grades for Russian ship building. Their properties are shown in table 4.

Curves of temperatures and mechanical loss factors of flexural vibrations (Oberst test) for Adi commercial mastics are shown in fig.1.

The extension of applications of vibrodamping mastic materials requires new technical characteristics. It refers to acoustic and other properties including technological properties which are necessary for good damping coatings. Automotive industry has very high requirements.

We have developed new experimental grades of Adi vibrodamping mastics for modern machine building industry. Some properties of these grades are shown in table 2 and fig.2.

Temperature-mechanical loss factor curves (Oberst test) for coatings prepared from experimental grades of Adi vibrodamping mastics are shown in fig. 2.

As the above experimental data show, experimental grades of Adi vibrodamping mastics extend technical applications of this class of materials. Increase of the level of mechanical energy absorption (Adi - 3-1 and Adi - 3-2) and extension of the temperature range for effective damping (Adi-6) open new possibilities for solving acoustic problems. Foam Adi (Adi-4) allows to produce coatings with damping and heat insulating properties. Mastic (Adi-7) which can be used to prepare damping coatings of high quality under fast conditions (heating) is good for conveyor processes with exact limit of time, e.g. in case of manufacture of cars or instrument bodies and household machines. Higher resistance of vibrodamping mastics to biological corrosion (Adi-8) significantly extends the geography of its applications and provides required stability of performances even in the regions with tropical climate.