Лако-красочные материалы — производство

This is the most standard adhesive joint and the one widely used as the standard for testing the performance of adhesives. When a lap joint (Figure 5.1) is loaded as shown in the direction of the arrows, the adhesive in the joint is subjected to primarily shear loads but also with an element of tensile […]

5.1 Introduction This chapter discusses the overall concepts for designing adhesively bonded joints and some guidelines for some of the more common joint designs are discussed. The specific types of joints that will be considered include: • Lap joint, • Double lap joint (tongue and groove), • Cylindrical joint, and • Butt joint.

Polychloroprene, nitrile, natural rubber, styrene butadiene rubber and butyl rubber can all be readily bonded with cyanoacrylates. EPDM and fluoroelastomers (such as Viton) can also be bonded, although only with specific grades of cyanoacrylate. The silicone rubbers and thermoplastic elastomers will usually require a primer but will also bond with cyanoacrylates. Cyanoacrylates are relatively rigid […]

One of the most widely used TPV is sold under the trade name of Santoprene™ and this material has a low surface energy, thus making it difficult to bond with engineering adhesives. Whilst cyanoacrylates with a surface primer give good results (Table 4.15), the failure modes are invariably at the adhesive-Santoprene™ interface. On some grades […]

Styrenic TPE are probably the most widely used thermoplastic elastomers. There are three distinctly different main types: Adhesive type Description Shear strength (N/mm2) Cyanoacrylate Standard ethyl >1.8* Toughened >1.3* Ethyl + primer >1.8* Two-part acrylic MMA 0.4 Silicone Alkoxy silicone 0.4 UV acrylic Visible light cure 0.8 Table 4.13 Adhesive shear strengths (SBR) Notes: * […]

SBR offers excellent abrasion resistance so is used mainly for automotive tyres. Other applications include shoe soles, waterproof materials and asphalt. SBR generally bonds well with cyanoacrylates and a surface primer is not usually required (Table 4.13).

This TPE is used for handles on power and hand tools but also as grips on everything from pens to golf clubs. Manufacturers use two-shot mouldings to form these grips but sometimes adhesives are required for prototype parts or for supplementing Table 4.9 Adhesive shear strength (neoprene rubber) Adhesive type Description Shear strength (N/mm2) Cyanoacrylate […]

Neoprene rubber is a thermoset elastomer used for window seals, hoses, cable insulation and for gaskets. There are various forms of neoprene available but they will all bond well with cyanoacrylates and a primer is not usually required (Table 4.9). 4.2.1 Polyisoprene Polyisoprene is a thermoset elastomer and has high tensile properties and its main […]

Nitrile rubber is one of the most widely used elastomers and is known for its superior high- and low-temperature performance and its exceptional oil, petrol and solvent resistance. Typical applications include hoses, shoes and flooring. Nitrile rubber is generally easy to bond with cyanoacrylates (Table 4.8) and the use of a primer is not normally […]

Natural rubber is created by processing the latex of a plant, Hevea brasiliensis, which is indigenous to the Amazon valley and is the only known plant to produce high — molecular-weight linear polymer. The latex is ‘tapped’ from the tree then collected and treated with a stabiliser and brought to a processing centre. There are […]