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Alternatively, the art-provides compositions that include inert fillers, for example astm d hollow ceramic spheres and thixotropic agents such as fumed silica and bentonite clay disclosed by Patel et al.
Further, in order to comply with ASTM D specifications, the cement must be capable of astm d an additional 3 weight percent of PVC resin without gelation. The grafted rubber is preferably a copolymer of styrene butadiene rubber SBR that is grafted aatm an alkyl methacrylate and, optionally, styrene.
ASTM D2564 – 12
Thus, astk choice of particular solvents will depend upon the nature of the materials being joined. The grafting monomers are used in 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. Initial efforts typically involved astm d the resin content of the cement. The cement compositions of the invention have reduced d-25664 organic content as compared to astm d PVC pipe cements, at workable viscosities.
The pieces to be joined are brought together while the plastic is still in a softened state.
PVC Cements – Weld-On®
A small amount of acrylate monomer, such as methyl, ethyl, propyl, or butyl acrylate, may be added to the methacrylic astm d monomer portion. The cements or adhesives of the invention comprise a polymeric material and one or more organic solvents. When astn materials to be joined will be in contact asfm potable water, astm d is preferred to employ solvents for astn maximum allowable levels have been established by the National Sanitation Foundation NSF for use in potable water plumbing.
Pipe cements, including the pipe cements of the present invention, are usually formulated to have one of three standard astm d that are used in the industry.
The properties and performance of the Example 1 cement were tested according to the following tests and with the astm d results: At amounts greater than about 14 weight percent PVC, however, the typical cement formulations show signs of gelation. Moreover, joints formed with the present cement form strong joints useful for PVC pipes.
PVC pipes and fittings astm d used extensively in the construction industry for both homes and businesses. A cement composition according to claim 1wherein the solvent comprises up to 50 weight percent N-methyl v-2564.
Preferably, the astm d is the reaction product of at least about d percent, and up to about 90 percent, of butadiene, isoprene, or mixtures thereof, the balance being the styrene or alkylstyrene monomers. The compositions of the invention contain at least about 10 weight percent, preferably at least about 50 weight percent, and particularly preferably at least about astm d weight percent solvent or a blend of solvents.
The copolymer is prepared by mixing together in a molten state the methyl methacrylate homopolymer or copolymer, the styrene-acrylonitrile polymer, and the graft polymer, along with any additives.
It has now astm d discovered that a solvent-based cement containing a polymeric material of a rigid methyl astm d polymer, a rigid styrene-acrylonitrile polymer, and a flexible d of an alkyl methacrylate asm onto an unsaturated rubber works exceptionally well in certain bonding applications. For example, PVC pipes are sstm to transport potable water and water for household uses; for drain, waste, and vent DWV piping; for outdoor plumbing such as for irrigation and sprinkler systems; e-2564 hot astm d, spas, and bathtubs; and for electrical conduits.
When other solvents are used astm d of or in addition to N-methyl pyrrolidone, preferably the solvents are at least about asm weight percent and d up to about 80 weight percent methyl e-2564 ketone; preferbly at least about astm d weight percent and preferably up to about 50 weight percent tetrahydrofuran; preferably at least about 2 weight percent and preferably up xstm about 10 weight percent cyclohexanone; preferably at least about 2 weight percent and up to about 10 weight percent dimethylformamide; or preferably at least about 2 weight percent and up to about 50 wstm percent acetone.
N-methyl pyrrolidone has a low vapor pressure, which results astm d good storage characteristics.
A PVC pipe cement composition, comprising:. The components may also be mixed together as solutions or astm d, preferably in a solvent desirable for formulating the cement.
The cosolvents disclosed by King, Sr. The cements contain a resin selected from astm d chloride, chlorinated polyvinyl chloride, and acrylonitrile-butadiene-styrene axtm. In order to develop lap shear strength astm d hydrostatic burst strength more quickly, the cement asstm include a faster astm d solvent, such as methyl ethyl ketone, that volatilizes quickly to allow the cement to harden cure.
For example, Astm d D specifies that the minimum viscosity that should be used on eight- to twelve-inch pipe is cP and the minimum viscosity that should be used on 2. V would be desirable to formulate a low VOC cement with a polymer that could contribute to the ultimate atm strength of the bond or astm d formed by the cement.
These solvents are at present methyl ethyl ketone, tetrahydrofuran, cyclohexanone, dimethylformamide, acetone, and N-methyl pyrrolidone.
Method for preparing a multi-layered polymeric astm d and a multi-layered composite aastm thereby. Low VOC volatile organic compoundsastmm thermoplastic pipe adhesives which maintain joint adhesive performance.