Polyvinyl chloride dipping

The two legs of each fusehead were then bonded together with Mipolan (jnixt of polyvinyl chloride, tricresylphosphate butyleneglycolphthal ate), the tips of the teeth suitably bent and the bridge wire soldered into position. After dipping the bridge wires into fusehead compns. the back of the comb was sheared off (Ref 2,p Ger... 

There are some other ways to apply coatings without the use of solvents. Plastisols315 involve the use of a paste of polyvinyl chloride particles in a plasticizer. Metal objects dipped in this can then be heated to harden the coating by dissolution of the plasticizer into the polymer. An example would be a wire rack for a dishwasher. Colored paint films can be laminated to plastics such as automobile parts and siding for houses by molding.316 Ideally, the dry paint film would be prepared by extrusion or other means that avoided the use of solvent. It is also possible to produce a coating from two monomer ingredients that polymerize in... 

Polyvinyl chloride (PVC) is often produced by suspension or emulsion polymerisation. It is used extensively in producing PVC pipes for construction. Impact modifiers are often added to strengthen the material. PVC is also used in plastisols for dipped coatings, in shower curtains, and in vinyl leather. Nonvolatile plasticisers are necessary in such applications where the material must remain flexible. Because PVC is a very hydrophobic polymer with good barrier properties, it makes an effective obstacle to oxygen and water vapour in packaging films. 

In a recent work by Nawi et al. (Nawi et al., 2012) conunercially acquired TiO photocatalyst (99% anatase) powder was mixed with epoxidized natural robber-50 (ENR50)/polyvinyl chloride (PVC) blend by ultrasonication and immobilized onto glass plates as TiO -ENRSO-PVC composite via a dip-coating method. Photo etching of the immobihzed TiOj-ENR50-PVC composite was investigated under the irradiation of a 45W compact fluorescent lamp. The composite samples are charac-... 

Polyvinyl chloride linings can also be applied by dipping in a plastisol solution or by spray coating. More details will be found in Chapter 5 Liquid Applied Linings. 

After decades of using cast iron and then ductile iron pipe (DIP), a water utility was asked by a member of the local developer community to allow use of polyvinyl chloride (PVC) pipe. The principal argument for the PVC pipe was less initial material cost. In response, the utility s board created an advisory committee to investigate and report back with recommendations. 

PVC is available as dice or pellets, and as plastisols (resin dispersed in solvent) and as sheet. All colours can be provided, as well as clear transparent material. Polyvinyl chloride is processed by injection moulding, extrusion, calendering, blow and rotation moulding, spreading, dipping and foaming. Sheet material can be formed by all standard techniques. 

Products that have to be stripped from the mold are made of an elastomeric material. If solvent is present it can be volatihzed in an oven after each dipping period. Resins that have been used for dip molding include vinyl copolymers, vinyhdene chloride, polyvinyl butyral, nylon, polyvinyl alcohol or acetal, and modifled acrylics. For rigid products, cellulosic plastics, styrene, and similar resins can be used. 

Polyvinylidene chloride (PVDC) and polyvinyl alcohol (PVA) microspheres were carbonized on ceramic membrane to fabricate activated carbon membrane for coke furnace wastewater treatment [15]. A ceramic tube was dipped into a polymer latex containing 70 wt% PVDC and PVA microspheres of 0.10-0.15 pm to form aggregates of polymeric microspheres on and within (within pores of) the ceramic pipe. The precinsor was heated at 300°C and further to 750°C for carbonization. Major decomposition of the polymeric precursor seems to occur at 300°C. By nitrogen adsorption applying Horvath and Kowazoe method the membrane was found to have micropores of 0.7-0.8 run in diameter and meso-pores of 2-20 nm. Hence, the membrane has bimodal pore size distribution. The molecular weight cutoff of the membrane was ca. 10,000 Dalton. 

Recently, Goddart et al. [6] reported a polyvinyl alcohol-copper(ll) initiating system, which can produce branched polymers on surfaces. The initiating system is prepared by dissolving polyvinyl alcohol in water that already contains copper nitrate (or copper chloride). The calcium carbonate filler is dipped into the solution and dried. If this is used for polymerization of an olefin (say, styrene), it would form a polymer that adheres to the particles, ultimately encapsulating them. The mechanical properties of calcium-carbonate-fiUed polystyrene have been found to depend strongly on filler-matrix compatibihty, which is considerably improved by this encapsulation. 

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