The production process of hot melt glue does not involve the application or production preparation of any polluting materials. This kind of material has been widely used in various industries because of its green and environmental protection characteristics. However, the degradation difficulties faced by traditional adhesive materials have also become a key obstacle to their development. This paper analyzes the application and development trend of various new polymeric adhesive, such as hydrophilic, low-temperature and biodegradable, which provides a reference for relevant technical R & D personnel in the industry.
Today, with the popularity of disposable packaging and other materials, the market has put forward higher requirements for the performance of hot melt glue according to the goal of sustainable development, requiring it to have certain biodegradability. Generally speaking, this kind of glue is made of matrix resin, antioxidant, plasticizer, tackifier, filler and other materials. Among them, the main components of the matrix resin are polyester amide, polylactide, polyhydroxyalkanoate and other compounds. Under the catalysis of biological enzymes, the biodegradable glue will be transformed into organic substances with relatively simple structure through oxidation-reduction, dehydrogenation and hydrolysis. Among them, polyester amide material combines the advantages of polyamide and polyester material. The glue prepared by this material can be hydrolyzed in an acid-base environment and degraded under the action of catalytic enzymes and microorganisms. The glue prepared from polylactide can be hydrolyzed in the dark and humid environment, and decomposed into carbon dioxide and water under the influence of catalytic enzymes and microorganisms. It is an important material for the research and application of its biodegradability. Polyhydroxyalkanoate is a kind of macromolecule material existing in organism. The glue prepared by this material has certain advantages in degradation and biological activity. Natural polymer materials such as bark and starch have gradually become important materials for the production and preparation of hot melt glue.
The melting temperature of traditional hot melt glue in disposable sanitary products related industries is about 160 ℃, while the low-temperature glue can be used at 110-130 ℃. Relatively speaking, the viscosity of this adhesive is lower than that of traditional adhesive, which can meet the needs of low-temperature environment. In practical application, the low-temperature adhesive can effectively avoid abnormal conditions such as carbon deposition and skin aging. It also has certain advantages in bonding strength and odor volatilization, so that the maintenance cost can be reduced for materials used in machines, and the baby can be prevented from being injured for products such as diapers. During the development process, the production and research units can balance the bonding strength and low-temperature operation requirements by optimizing and adjusting the formula, so as to further expand the application range of low-temperature adhesive.
Hydrophilicity is an important direction in the development of adhesive technology. The R & D unit can adjust and modify its components to make the prepared adhesive have certain hydrophilicity. In the fierce market competition, hydrophilic adhesive will have greater market advantages.
While improving the properties of hot melt glue, such as adhesion, degradation, high and low temperature resistance, hydrophilicity and so on, the production and development units also need to optimize and innovate its packaging. The traditional silicone paper packaging adhesive is relatively inconvenient in production efficiency and operation. The production unit can complete the packaging of glue through fusible film and other technologies, so as to improve the production efficiency and bring more convenience to users. In addition, the production unit can also improve the performance of the adhesive from the aspects of spraying frequency and oil resistance in the use process, so as to meet the diversified needs of users.
In a word, with the deepening of technical research, hot melt glue will make more achievements in biodegradability, hydrophilicity, high temperature and low temperature resistance, oil stain resistance, low temperature melting, etc., so as to promote the continuous improvement of the quality effect of polymeric adhesive products.