Finish for plastics

The increasing use of plastics as construction materials has led to a renewed interest in decorative finishes for plastic products. There are a wide variety of secondary operations that can be used for adding decoration to molded parts. Progress is also being made in providing decorative surfaces in the mold itself. The first use of this is in woodlike panels for wall decoration and furniture parts such as cabinet doors. 

VIC . [Ashland] Pcdyester and acrylic urethane resins fw gas curing finishes for plastics, metal, heat-sensitive substrates. 

Uses Binder for highly flexible, water-thinnable, air- and force-drying primers and one-coaf finishes for plastics Features Compat. with many acrylic disps., PL) disps., and water-thinnable polyesters... 

Chem. Descrip. Nonreactive linear PU based on MDI Uses Binder for physically drying primers and finishes for plastics, and finishes for flexible substrates Features Solv.-free... 

Avalm, Pigmented PTFE, Greene, Tweed Co. Avantra, Styrenic polymer resins, BASF Corp., Polystyrene Business Group Aviral, Emulsifier, surfactant, Henkel Corp. Avioy, Decorative finish for plastic (automotive), Avery Dennision Corp. 

Thermark, Decorative finish for plastic, Avery Dennison Corp. 

ASTM D2408, Woven Glass Fabric, Cleaned and After-Finished with Amino-Silane Type Finishes, for Plastic Laminates ... 

As a one coat finish for plastics, acrylic urethanes have one major limitation, the aggressive solvent content of the acrylic and the polyisocyanate resins themselves. This limits their use to coatings for thermosetting substrates and a small number of TPA substrates such as ABS, PA (polyamide), RIM polyurethane and PPO (jmlyphenylene oxide). Even then, the system should be evaluated to ensure that no degradation of the plastic s impact resistance has taken place. Consult the TPA chapter for discussion on plastic substrates. 

Various types of surface finishes are available for plastics and RP products, such as smooth, textured, molded-in color, and inmold coating. A textured product surface can be obtained through either a textured mold cavity or a postmold paint process. The former method is the most commonly used. A... 

Alkanesulfonates are preferably used as an internal antistatic agent for plastics, but where incorporation into the polymer is not possible they can be applied to the surface of the finished article in the form of a 1 % aqueous solution of the surfactant by spraying or dipping [99]. 

P.O.68 lends itself for use in industrial paints, including automotive finishes, as well as for plastics. It provides dull, reddish shades of orange. Two varieties are commercially available a version with a coarse particle size and a type with a fine particle size. 

P.R.190 has a relatively small impact on the market. It is a specialty product for industrial paints, especially for automotive finishes, but offers no advantage over other members of its class. Its shade is dull and referred to as scarlet. In white reductions, the commercial type is very bluish and equally dull. The particle sizes of this product are too coarse for it to be used in metallic finishes. P.R.190 is very durable and very fast to organic solvents and to migration. The pigment is heat stable up to processing temperatures of 200°C. Despite its good heat stability, the pigment possesses only limited commercial value as a colorant for plastics. 

Isophorone is a solvent for a large number of natural and synthetic polymers, resins, waxes, fats, and oils. Specifically, it is used as a solvent for concentrated vinyl chloride/acetate-based coating systems for metal cans, other metal paints, nitrocellulose finishes, printing inks for plastics, some herbicide and pesticide formulations, and adhesives for plastics, poly(vinyl) chloride and polystyrene materials (Papa and Sherman 1981). Isophorone also is an intermediate in the synthesis of 3, 5-xylenol, 3, 3, 5-trimethylcyclohexanol (Papa and Sherman 1981), and plant growth retardants (Haruta et al. 1974). Of the total production, 45-65% is used in vinyl coatings and inks, 15-25% in agricultural formulations, 15-30% in miscellaneous uses and exports, and 10% as a chemical intermediate (CMA 1981). 

This method is normally followed for plastic products. However the same with modifications of equipment is adopted for manufacture of small rubber components. By careful control of the feed stock the rubber products can be vulcanized in less than several minutes. This method can be completely controlled by proper feed, injection and demoulding cycles resulting in low rejection rates and lower finishing costs. 

Solvent for fats, waxes, gums, and resins pharmaceutical salves and lotions lubricaling-oil additives detergents and emulsifiers textile antistatic and finishing agents plasticizers nonionic surfactants and cosmetics. See also Detergents and Plasticizers. 

Chapter 3 Building planning. This chapter contains virtually all the requirements associated with fire safety, including those for interior finish, foam plastics, insulation, and siding... 

The most common upper-neck shape (finish) for sparkling wine bottles is one that accommodates a crown cap, a natural cork, and/or a plastic stopper. The internal diameter (i.d.) of the neck is extremely important, as the tightness of the fit between the bottle wall and the cork or plastic stopper is critical. Glass manufacturers, therefore, have tight specifications for the internal diameter of the neck. The designed headspace is approximately 4 percent of the total volume of the bottle below the bottom of the cork. This allows for liquid expansion without excessive increase in pressure. 

The basic methods of finishing used for plastics and for other substances like paper, textiles, ferrous and non-ferrous metals were developed originally from each other, so necessarily there are similarities between them—but the evolution of a technology specific for plastics was essential and therefore inevitable. 

Reaction injection molding (RIM) is a fast, low-pressure, low-temperature, low-cost process for one-step conversion of reactive liquids into large finished solid plastic products. Liquid polyol and liquid diisocyanate are mixed by impingement, pumped instantly to fill a large mold cavity, and polymerize/ cure rapidly to form a thermoset polyurethane product. The cured polymer may be a stiffly flexible product such as automotive bumper covers, front ends, and trim or a rigid foamed product such as furniture and housings (cabinets) for computers, business machines, TY and radio. 

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