Adhesive foaming

Polymeric MDI s Low-intermediate 2.1-2.5 Brown liquid Semiflexible, 2-K foam adhesive... 

Fig. 14. Foaming adhesive joint. Reproduced by permission of the Boeing Company.

In-service issues. As mentioned previously, many early service failures of bonded structure were due to adherend surface treatments that were unstable in long-term exposure to water. A majority of these problems were resolved by the adoption of surface treatments such as chromic and phosphoric acid anodize for aluminum details. The remaining few were alleviated by the adoption of phosphoric acid anodized honeycomb core and foaming adhesives resistant to water passage. Other service durability issues such as the cracking of brittle potting compound used to seal honeycomb sandwich assemblies, and subsequent delamination, have been minor in scope. 

PLASTEC s staff of specialists offers professional services in a wide range of interest such as packaging, electronics, deterioration (eg — weathering, microbiological, compatibility), new materials, composites, foams, adhesives, specifications, test methods, tooling and processing, etc. At the direction of DoD these technical services are available to the entire US scientific and technical community... 

Chicago, II., 26th-29th Sept.1995, p.459-63. 43C6 ADVANCES IN FOAM ADHESION TO REFRIGERATOR LINERS AND OTHER SUBSTRATES... 

A stndy was made of the effects of foam formulation and process conditions and liner composition on the adhesion of HCFC-141b blown rigid PU foam thermal insulation to refrigerator liner protective layers made of ABS, high-impact PS (HIPS), PE and blends of HIPS and PE containing a compatibiliser and adhesion promoter. A tensile test was used to quantify the level of adhesion before and after thermal cycling, and the Brett mould was used for laboratory simulations of foam adhesion within... 

The Dow Chemical Company, Castor Oil, Inc., and the USD A Western Regional Research Center are collaborating to develop the castor plant as a suitable oilseed for specialty oils that can be converted into lubricants, coatings, foams, adhesives, and engineering thermoplastics. Castor oil already contains ricinoleic acid, a fatty acid used in many industrial applications, but project partners hope to produce other industrially desirable fatty acids within the castor bean. 

Fillers with a density lower than that of epoxy can be used to provide reduced specific gravity in cured products. These are usually gas-filled microballoons. Although they generally bring about a significant increase in viscosity, the microballoon filled epoxies (sometimes called syntactic foam adhesives) are often used in marine applications where low density and buoyancy are important criteria. 

Plastic foams are manufactured from thermoplastic and thermoset resins in various forms. The main pitfall in joining plastic foam is that of (1) causing the foam to swell or collapse by contact with a solvent or monomer and (2) having the adhesive alter the properties of the foam through its absorption into the foam. Adhesion and joining are usually not a serious problem because of the porous nature of the foam. 

Note that there are closed-cell and open-cell foams. Adhesives may spread or wick deeply into the open-cell variety, thereby affecting the resulting mechanical properties of the foam and perhaps even weakening the foam. When foam is bonded to another less porous substrate, the adhesive could be applied to the nonfoam substrate to minimize the wicking and ingress of the adhesive into the body of the foam. With the closed-cell variety, the adhesive cannot wick deeply into the foam, but usually the foam s skin must be machined or abraded to allow for some surface roughness for the adhesive to mechanically attach. 

In future, the company plans to extend the range of conversion processes to include blown film, blow moulding, fibre and nonwovens, foam, adhesives and emulsion coatings. 

CHLOREZ is compatible with most commonly used resins, rubbers, plasticizers, waxes, and drying oils. Because of their very high active halogen content and low cost, CHLOREZ products are finding wide usage as flame retardant additives in coatings, inks, plastics, foams, adhesives, paper and fabrics. 

The dressings are also available as in situ formed foams, adhesive island dressings, and cavity filler " and are suitable for wounds with moderate to heavy exudation. 

In rigid urethane foams, the cell shapes are elliptical like eggs, and, therefore, the compressive strengths in the direction perpendicular to foam rise is smaller than the direction parallel to foam rise. Therefore, if urethane foams are required to have the same compressive strength as pyranyl foams in the direction perpendicular to foam rise (i.e., compressive strength in the direction vertical to the panel substrate) urethane foams must have foam densities greater than those of pyranyl foams. Adhesion of pyranyl foams to various substrates, e.g., steel, phosphated steel, stainless steel and aluminum, as well as paper and wood, is very good. 

Syntactic Foams Adhesives should be selected based on the resin matrix, which is usually epoxy or phenolic (18). 

Carwinate []. TM for isocyanates used to make urethane elastomers, coatings, foam adhesives, rigid plastics, sealants, and one-shot flexible, semiflexible, and semirigid foams. 

Desmodur [Bayer AG]. TM for a group of isocyanates and isocyanate prepolymers for urethane coatings, foams, adhesives, etc. 

Use (Solid) Mechanical rubber products, lining oilloading hose and reaction equipment, adhesive cement, binder for rocket fuels, coatings for electric wiring, gaskets and seals. (Liquid) Specialty items made by dipping or electrophoresis from the latex. (Foam) Adhesive tape to replace metal fasteners for automotive accessories, seat cushions, carpet backing, sealant. 

Use Hydraulic fluids, rubber lubricants, antifoam agents, intermediates in urethane foams, adhesives, coatings, elastomers, plasticizers, paint formulations, laboratory reagent. 

Polyurethane products and formulated systems are used in rigid foams, flexible foams, adhesives, sealants, coatings and elastomers, as well as in many other applications. Propene glycols are used in a wide variety of end-use and industrial applications, from unsaturated polyester resins, cosmetics and household detergents, to paints and automotive brake fluids. Propene glycol ethers are commonly... 

Foamed adhesive tapes Adhesive tapes without a substrate, with the total system consisting of a pressure-sensitive adhesive polymer with two-sided adhesive properties available in foamed and closed-cell structure. They are not to be confused with one or two-side adhesive tapes with foam-structure substrates. In... 

Adhesive surface Foamed adhesive layer Adhesive surface... 

In order to avoid the sticking together of the two-sided and foamed adhesive tapes when rolling them up, siliconized release liners are required. The specifically formulated release layers enable the residue-free stripping of the adhesive tape. The same release liners serve the temporary fixation of adhesive labels. 

Lignin-PeAtund PoZyuA.ztka.nte. The manufacture of polyurethane foams, adhesives and coatings from lignin-derived polyes-ter-ether-polyols and various commercial diisocyanates has been accomplished and reported earlier (16,17,18). Foam properties... 

Chlorez . [Dover] Resinous chlorinated paraffin flame retardant for paints, printing inks, plastics, foams, adhesives, paper and fabric coatings. 

Fastbond . [3M/Industiial Spec.] Contact and foam adhesives. 

VoranoL [Dow Dow Ahlen] Polyether polyols for polyurethane indus for appliances, rigid foams, adhesives, binders, sealants, coatings, flexbile slabstock foams, RIM and structural polymers, dynamic elastomers. 

Property SPI-Kymene Foamed Adhesive Enzyme-modified Soybean Meal... 

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