ASTM D Standard Specification for Solvent Cements for Poly(Vinyl Chloride) (PVC) Plastic Piping Systems. Buy ASTM De1 Standard Specification for Solvent Cements for Poly( Vinyl Chloride) (PVC) Plastic Piping Systems from SAI Global. WELD-ON products meet, and more importantly, exceed ASTM performance . Meets and exceeds: ASTM D NSF/ANSI 14 NSF/ANSI 61 CSA B
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During set and cure, the solvent evaporates and the thermoplastic materials harden.
USB1 – MABS-based PVC pipe cement – Google Patents
The rubber may be produced by emulsion polymerization, in which case, following grafting, the grafted rubber may be spray dried prior to preparing the polymeric material of the inventive compositions. Because the MABS polymeric material is atm soluble in the solvents typically used in cements astm d-2564 PVC pipe, the concentration of the copolymer in the astm d-2564 can be higher than the concentration of PVC in conventional cements.
The components may also astm d-2564 mixed together as solutions or suspensions, preferably in a solvent desirable for formulating the aastm. The invention has been described in detail with reference to preferred embodiments thereof.
The invention is illustrated by the following example.
Astm d-2564 has now been discovered that a solvent-based cement containing a polymeric material of a rigid methyl methacrylate polymer, a rigid styrene-acrylonitrile polymer, and a flexible copolymer of an alkyl methacrylate grafted onto an unsaturated rubber works exceptionally well in certain bonding applications.
The lap shear strength was measured at In recent years, environmental concerns have prompted efforts aimed toward reducing the volatile organic astm d-2564 VOC in industrial materials, including plastic astm d-2564 cements. The primer also usually includes one or more pigments or colorants.
The faster evaporating solvents astm d-2564 as methyl ethyl ketone, tetrahydrofuran, and acetone tend to evaporate from the cement over time, leading to increased viscosity. In one preferred embodiment, at least about 10 weight percent and up to about 50 weight percent N-methyl pyrrolidone is used in making a cement. Adhesives and sealants d-264 adhesion promoter comprising waste powder prime. The cements contain a resin selected from polyvinyl chloride, chlorinated astm d-2564 chloride, and acrylonitrile-butadiene-styrene copolymer.
Pipe cements are usually applied by a process that includes application of a primer followed within about five minutes, preferably within about one minute, and particularly preferably in about thirty seconds to about one minute, by application of the cement.
All parts and percentages are by weight astm d-2564 otherwise noted.
The grafting monomers may be reacted sequentially or aastm a astm d-2564. The assembled joint is allowed to fully cure harden before being put into use. It will astm d-2564 appreciated that the cement, sealant, and adhesive compositions of the invention can contain optional ingredients, including those well-known in the art, such as fillers, pigments, dyes, colorants, viscosity-modifying agents, stabilizers, and so forth.
A cement composition according to claim 1wherein the rubber is a reaction product of from about 60 to about 90 percent of a monomer selected from the group consisting of aztm, isoprene, and mixtures thereof, with from about astm d-2564 to about 40 percent styrene or alkylstyrene, the alkyl group having up to astm d-2564 carbon atoms.
Thus, the choice of particular solvents will depend upon the nature of the materials being joined. The rigid methyl astm d-2564 component preferably has a weight average molecular weight of at least about 60, and up to aboutas measured by light astm d-2564 in chloroform.
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Astm d-2564 cements produced according to these patents are relatively expensive because of the cost of the hollow ceramic spheres. It will be appreciated that each d-5264 the foregoing weight percent limitations, as well as each of the other quantitative limitations provided for the invention that follow, may be employed alone or in combination with other limitations.
The rigid asmt methacrylate component may astm d-2564 a homopolymer of methyl methacrylate or a copolymer of methyl methacrylate with at least about 0.
According to ASTM D guidelines, a wstm cement has a minimum viscosity of about 90 centipoise cP ; a medium-bodied cement has a astm d-2564 viscosity of about cP; and a heavy-bodied cement has a minimum viscosity of about cP. Although the pieces should be, and preferably are, machined for a close fit, gaps will still remain. Method for preparing a multi-layered polymeric composite and a multi-layered composite produced thereby.
Astm d-2564 cement composition according to claim 1wherein astm d-2564 solvent comprises N-methyl pyrrolidone. US USB1 en Moreover, joints formed with the present cement form strong astm d-2564 useful for PVC pipes. Usually the heavier-viscosity cement grades are used for pipes having larger diameters or for non-interference fits. The assembled joint is allowed to set for the time recommended by the ASTM method before installation. The grafted rubber e-2564 preferably a copolymer of styrene butadiene rubber SBR that is grafted with an alkyl methacrylate and, optionally, styrene.
Year of fee payment: Usually, the pieces are joined immediately after the final coat of cement d2564 applied, or at least within about one minute, and preferably within about twenty seconds.
The grafting astm d-2564 are used astm d-2564 a ratio at least about 40 parts of the methacrylic acid ester portion to about 60 parts by weight of the styrene or alkylstyrene monomers. Such materials are readily available commercially, and the levels and methods of incorporation are well-known to the skilled artisan.