AdhesiveIt is inseparable from our daily life and is often used. So what are the classifications of adhesives? What are the eight categories of adhesives we often talk about? In what fields are they applied? The author has made the following summary for everyone, let’s take a look.
1. Animal glue
With animal skin and bones It is a protein solid made by partially hydrolyzing, extracting and drying the collagen contained in the protein or tendons as raw materials. Color is light yellow to brown. Soluble in water, slightly soluble in alcohol, insoluble in organic solvents. Its aqueous solution has surface activity and high viscosity. It freezes into an elastic gel after cooling and returns to a solution when heated. The latter is a unique characteristic of animal glue, which can be quantitatively expressed in terms of gel strength, which is customarily called freezing force. This is the main physical property that determines the commercial value of animal glue and is the rigidity of the gel formed under standard conditions. The value of goods increases with the increase of freezing force. Freezing force is measured using a special instrument called a Bloom meter and is expressed in” grams.”
Animal glue is mainly used as industrial adhesive, emulsifier and emulsion stabilizer, flocculant in mineral processing, papermaking and Sizing agents in the textile industry, as well as plate making and ink roller manufacturing in the printing industry, etc., are also widely used in the production fields of food, photographic materials, pharmaceuticals and cosmetics. Modernly developedmicrocapsule technology font> is a new application field of animal glue.
2. Plant gum
Plant gums (including sesbania gum, guar gum, flax gum, and coumarin gum) are a type of natural plant gum newly developed in China. It is prepared from abundant plant beans, and its main ingredients aregalactomannan , andprotein , Cellulose, moisture and a small amount of calcium, magnesium, etc.Inorganic elements; In addition, there is also gelatin extracted from Gelidium.
Plant gum is widely used and can be roughly divided into civil and industrial uses. For civilian use, it is mainly used in home decoration. For example, the glue for wallpaper is vegetable glue. Vegetable glue is also used in some furniture, wood and other places that require adhesives. It is not harmful to human health at all, so it is accepted. Plant gums are used industrially as catalysts, thickeners, adhesives, additives, enhancers, etc. for certain construction procedures. For example, it can be used as a catalyst in petroleum refining, a thickener in petroleum well fracturing fluids, a binder in refractory materials, an additive in the paper industry, a reinforcing agent in the ceramic industry, etc.
3. Inorganic substances and minerals
7. Composite of thermosetting, thermoplastic materials and elastomers
Thermosetting, thermoplastic materials and elastomers are compounded, that is, Composite typeAdhesive,By ZaiThermosetting resinjoinThermoplastic resin Or synthetic rubber are made by blending each other. While maintainingheat resistance, and improved Flexibility. MainComposite methodhas phenolic-acetal, phenolic-polymer Amide, phenolic-epoxy, phenolic-nitrile rubber, phenolic-chloroprene rubber, epoxy-polyamide, epoxy-polyurethane, epoxy-polysulfide rubber, etc.
Compound adhesive is mainlyUsed for bonding metal or non-metal structural parts of the same and different materials, inaviation, automobiles, ships, electronics, machinery, construction and other industrial sectors have been widely used.
Title of this article: Eight categories of adhesives and their applications
Source of this article: http://www .wellgo.com.cn/newb/information_2386.shtml
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