Flame retardant monomer is introduced into pressure sensitive adhesive

Flame retardant monomer is introduced into pressure sensitive adhesive

Introduce flame retardant group, give acrylic pressure sensitive adhesive flame retardant. The acrylic polymer modified by phosphate ester was synthesized from 2-hydroxy-3-chloro-propyl methacrylate (MACA) and phosphorus pentoxide, which increased the activity of the phosphoric acid group, introduced the compound flame retardant chlorine and phosphorus elements and made it have good adhesion and flame retardant effect. 2,4, 6-tribromophenyl ester can be free radical copolymerization with acrylic acid and its esters, methacrylic acid and its esters, acrylonitrile, styrene, and other monomers, so as to give polymer products excellent flame retardant properties, and can not damage the original physical properties of polymer products under the premise of some of the properties to improve.

Bis (2,3, 1-2-bromo-propyl) allyl isocyanic acid (DBAC) is an unsaturated halogenated triazine compound, which has a certain flame retardant effect on the reactive flame retardant of acrylic resin. It has a good flame-retardant synergistic effect when used with antimony trioxide, but has no synergistic effect when used with toluene phosphate. The combination of silicone-modified acrylic resin with nano-dihydroxy-compound metal oxide (LDH) in a certain range makes the acrylic resin have high flame retardancy and excellent mechanical properties.

The surface properties of polymer materials can be changed effectively by using plasma to adapt to various applications. Shi Lashun has reported on the flame retardation of polymers by CF4/CH plasma deposition and the strong promotion of carbon formation of matrix polymers by plasma grafting of methacrylic acid, acrylic acid, and acrylamide with ethylene-vinyl acetate copolymer (EVA).

What are the initial adhesion and peeling force of pressure sensitive adhesive

Initial Tack force T (Tack), also called fast tack force, refers to the anti-separation ability shown when PSA products and adhesive are quickly separated immediately after contact with very light pressure. Adhesion A refers to the ability of adhesion to the PSA product and surface to resist interfacial separation by adhesion at appropriate pressure and time. C(cohesion) refers to the strength of the adhesive layer itself; Adhesive base force K (keying) refers to the adhesion between the adhesive and the substrate, or between the adhesive and the substrate and the substrate.

A good PSA must satisfy the balance of four adhesion properties, that is, T<A<C<K. This is because A must be greater than T, otherwise, PSA is not pressure-sensitive; C must be greater than A, otherwise, the adhesive layer will be destroyed when the tape is removed, resulting in adhesive pollution, sticky surface, wire drawing, and other defects; C must be less than K, otherwise the adhesive layer will be separated from the substrate.

The peeling force of the pressure-sensitive adhesive (the peeling force between the adhesive tape and the adhesive surface) < the cohesion of the adhesive (the force between the molecules of the pressure-sensitive adhesive) < the adhesive base force (the adhesion between the adhesive and the substrate). Such a pressure sensitive adhesive in the process of use will not have the phenomenon of degumming.