Polyvinyl acetate sealant

Bathrooms - Polyvinyl acetate sealants, acrylie emulsion sealants and silieone rubber sealants are all used as bath-tub caulks and for wall tile and wallboard joints. Polyvinyl acetate and acrylic emulsion sealants are easier to apply and clean up, and are lower cost than silicone sealants. The silieone sealants form stronger adhesive bonds and have better long term durability. 

Typical values for the glass transition temperature of acrylic and polyvinyl acetate sealants are in the range of — 15°C to —20°C. The glass transitions of neoprene and fluoro-polymer sealants range from —22°C to —32°C. Polysulfide and polyurethane sealants exhibit glass transitions at approximately —40°C. Silicone sealants have the best low-temperature performance with glass transitions of approximately —65°C. 

Butyl benzyl phthalate is a plasticizer added to polymers to give flexibility and softness. It is used extensively in polyvinyl chloride and in cellulose plastics, polyvinyl acetate, polysulfides, and polyurethane. Also used in flexographic inks for food packaging applications and acrylic coatings, profile extrusions, slush moulding, film and sheeting, coated fabrics, floor and wall coverings, vinyl foams and plastisols for car sealants. 

Use Latex water paints adhesives for paper, wood, glass, metals, and porcelain intermediate for conversion to polyvinyl alcohol and acetals sealant shatterproof photographic bulbs paper coating and paperboard bookbinding textile finishing non-woven fabric binder component of lacquers, inks, and plastic wood strengthening agent for cements. 

More than half of all the benzoic acid produced in the United States is used in the manufacture of various polymeric products, primarily the family of plastics known as the polyvinyl acetates (PVAs). The PVAs, in turn, are used as adhesives, caulks, sealants, and coatings for paper, film, and plastic foil. About a quarter of all benzoic acid is converted to its sodium and potassium salts, sodium benzoate (C6HsC00Na) and potassium benzoate (C6H5C00K), for use as food preservatives. Sodium benzoate and potassium benzoate are now the most widely used food preservatives in the world. They are added to a host of products, such as soft drinks and fruit juices, jams and jellies, baked goods, and salad dressings. They are also added to a number of non-food products such as mouthwashes, toothpastes, cosmetic creams, and deodorants. 

Emulsions of polyvinyl acetate and polyalkyl acrylates have been used as tub caulking compositions, spackling compounds and as building sealants.22 Acrylic sealants which harden in the presence of powdered iron or copper meet Federal Specifications TT-S-00230C. 27 Liquid monomers, such as polyethylene glycol dimethacrylate and butyl alpha—cyanoacrylate have been used as room temperature curing sealants.22 22. 

Polyvinyl acetate Styrene/PVP copolymer adhesive, wood door Ammonium caseinate adhesive, wooden doors Calcium caseinate adhesive/sealant mfg. 

Polyvinyl acetate (PVAc) emulsion polymers are used for adhesives, sealants, and paints. PVAc homopolymer is too brittle for most end uses, so much of fte PVAc used in the paint industry is internally plasticized through the incorporation of comonomers into the polymer backbone. However, there are some uses of externally plasticized PVAc in adhesives. The most common plasticizers used with adhesives are a variety of benzoate esters, although dibutyl terephthalate is now being promoted for this application. 

Sealants and caulks based on vinyl acetate homo- and copolymers have been on the market since the late 1950s. Use of these lower-performance materials has been mostly in residential areas—bathtub caulking, wall tile joints, wallboard joints, etc. Latex caulks based on polyvinyl acetate plasticized with dibutyl phthalate, or on one of the newer vinyl acetate-acrylic emulsion copolymers, have the same ease of application as the acrylic emulsion caulks but are less flexible, harden on aging, and have inferior exterior durability. ... 

Table 16. Polyvinyl Acetate-Based Sealant (Tub and Tile Caulk, White, Low Shrinkage).

There is a similarly wide range of sealants for the DIY household maihet, varying from oil based putties for glazing polyvinyl acetate and acrylic emulsion sealants, with easy appUcation and clean-up properties and butyl, polyiuethane and silicone sealants for dmable, flexible, long lasting external seals. Again the cost increases progressively from oil based putties to silicone rubber based sealants. 

The polyvinyl acetate emulsions were designed for adhesive and coating use rather than for sealants. The homopolymers have little flexibility and are water sensitive. High levels of solvent type plasticizers (e.g. dibutyl phdialate) are used to obtain the required flexibility, but after application die plasticizer volatilizes out on aging. This results in a loss of flexibility in the sealant and failure through cracking if used in areas subject to joint movement. 

Plasticizers are used in butyl rubber, polyureAane, polysulfide, solvent aerylies, polyvinyl acetate, and silicone rubber adhesives and sealants. The compatibility of the plasticizer depends on base polymer chemistry. Plastieizers for silicone systems are low molecular weight... 

In emulsion adhesives and sealants, ionic and nonionic surfactants are used to disperse pigments and fillers. In polyvinyl acetate emulsion sealants, most grades of calcimn carbonate can be dispersed using anionie or non ionie surfactants. Titanium dioxide is more difficult to disperse due to its finer particle size ( 0.2pm) and anionic dispersants such as potassium tripolyphosphate and polymeric salts of acryhc acid are used. 

There are a variety of thickening agents (thixotropes) designed for different applications. In aqueous and latex adhesives and sealants, such as acrylics, polyvinyl acetate, butyl, and natural rubber, frequently used types include ... 

Bentonite thickening agents are used in various water based adhesives, caulks and sealants including those based on proteins and starch, polyvinyl acetate emulsions, natural rubber latexes, acrylic emulsions, neoprene emulsions, butyl emulsions, nitrile emulsions, and SBR emulsions. 

Attapulgite can be used in both water and solvent based adhesives and sealants to impart thixotropy, and good filler suspension. In water based polyvinyl acetate and vinyl emulsion systems, levels of 2 to 8 % are used. The attapulgite is easy to disperse and is usually added to the formula with the other dry components. The thixotrope also imparts good shelf stability,... 

Newman, L.E., 1986, "Polyvinyl Acetate-Based Caulks and Sealants", Caulks and Sealants Short Course, Adhesive and Sealant Council, Washington, DC, Dec., pp. 205-240. 

Uses Surfactant all-purpose detergent and wetting agent for adheslves/sealants, agric. emulsifiers dispersant for polymers/pigments dye disp. asphalt emulsification high temp, water-sol. emulsifier/sfabilizer emulsification/disp. polyvinyl acetate emulsifier for acrylic resin, polyester resin floor waxes and polishes emulsifier/sfabilizer food-pkg. adhesives emulsifier In mfg. of fo -conlacl articles... 

Polyvinyl alcohol (PVA) and cellulose acetate (CA) have been found to be among these effective "sealants."... 

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