Pressure sensitive adhesive is an adhesive with adhesion and tearing ability. It is characterized by high adhesion at room temperature and can bond quickly under negative pressure. Pressure-sensitive adhesive is widely used in adhesive tape, label, protective film, medical dressing and other fields.
Definition and application of the pressure-sensitive adhesive
Pressure sensitive adhesive is an adhesive with adhesion and tearing ability. It is characterized by high adhesion at room temperature and can bond quickly under negative pressure. Pressure-sensitive adhesive is widely used in adhesive tape, label, protective film, medical dressing and other fields.
Characteristics of the acrylate pressure-sensitive adhesive
Acrylate is a commonly used curing agent for pressure-sensitive adhesive. Acrylate pressure-sensitive adhesive has the following characteristics:
1. Fast curing speed: Acrylate pressure-sensitive adhesive can be quickly cured under light or heat irradiation, saving the production time.
2. Excellent adhesion: Acrylate pressure-sensitive adhesive has good adhesion properties and can firmly bond to various surfaces.
3. High heat resistance: Acrylate pressure-sensitive adhesive has high heat resistance and can maintain adhesion in high temperature environment.
4. Good weather resistance: acrylate pressure-sensitive adhesive has good weather resistance, and can be used in the indoor and outdoor environment for a long time without discoloration, falling off and other phenomena.
The curing process of acrylate press-sensitive adhesive is mainly accomplished by free radical polymerization reaction. The acrylate monomer in the acrylate pressure-sensitive gel underwent free radical polymerization under light or heat irradiation to form a crosslinking network structure, thus realizing the curing of the adhesive.
Specifically, the curing process of acrylate press sensitive consists of the following steps:
1. Activation of the initiator: under light or heat irradiation, the initiator absorbs energy and produces the activated free radicals.
2. Free radical polymerization reaction: the activated free radical reacts with the acrylate monomer to trigger the polymerization reaction. The double bond in the acrylate monomer cracks, and the free radical reacts with the other monomers to gradually form a polymer chain.
3. Formation of a cross-linked network: the polymer chains are connected by covalent bonds to form a cross-linked network structure. The formation of the crosslinking network makes the adhesive a certain mechanical strength and adhesion.
4. Control of the curing process: During the curing process, it is necessary to control the time and intensity of light or heat irradiation, as well as the temperature of the initiator to ensure that the adhesive can achieve the ideal curing effect.
Influencing factors of curing of acrylate pressure-sensitive adhesive
The effect of acrylate pressure-sensitive adhesive curing is affected by many factors, including the intensity and time of light or heat irradiation, temperature, the type of initiator and the amount of addition, etc. Among them, light or heat irradiation is one of the key factors for the curing of acrylic ester pressure-sensitive adhesive, and the intensity and wavelength of different light sources or heat sources will affect the curing effect. Temperature is also an important factor affecting the curing speed and effect. The appropriate curing temperature can improve the adhesion and heat resistance of adhesives. The selection and addition amount of initiator will also affect the curing effect, according to the specific application requirements Adjust.
The principle of curing of acrylate pressure is to form a cross-linked network structure through free radical polymerization reaction, so as to realize the curing of adhesive. The curing process is influenced by factors such as light or heat exposure, temperature, and the initiator. Acrylate pressure sensitive adhesive has fast curing speed, excellent adhesion, high heat resistance and weather resistance, widely used in tape, label, protective film and other fields. For the research and application of pressure sensitive adhesive, it is very important to deeply understand and master the curing principle of acrylate pressure sensitive adhesive.