Anaerobic Adhesive abroad starting in the 1940s, in 1953 the United States REBurnett and VKKrieble of methacrylic acid oxidation than glycol diester found acrylate anaerobic curing characteristics. Later, by adding a certain amount of low peroxidase activity has made the first practical value of the species, after the technology has improved, the current U.S. production of anaerobic adhesives largest in the world, its biggest supplier of rubber products Loctite Corporation. More of its product range, each of which is prepared according to certain needs. Plastic viscosity range from thin to thick to the water to a toothpaste-like shape, hardness and intensity range of big changes, you can easily remove small to large to be used for high strength structural adhesive.
From the perspective of the development of anaerobic adhesives, anaerobic adhesives have been the universal development of four generations: the first generation of 610 years of the 20th century up to the development of methacrylate ester-based polyol species; second generation 1975 years to develop the structure of polyurethane modified anaerobic adhesive, on this basis have developed second-generation structure of anaerobic adhesives; subsequently been found in a large gap to fill sticky third-generation UV curing anaerobic structural adhesive; into After 80 years, anaerobic adhesives achieved a remarkable progress is microencapsulated. General-purpose adhesive for locking and sealing anaerobic, performance is very good, but need to be washed in use screws, glue, and other steps to remove the remaining glue and a little irritating odor, affect its application. If the package in the anaerobic adhesive polymer, the microcapsules become dry, and then coated with screws and adhesive agent, such as pre-coated screws are "dry sex". However, when screwed into the threaded parts, the capsules to burst, out of glue, curing time due to lack of oxygen, from locking and sealing effect, which is kind of glue and glue craft the perfect combination of the results. Some people think that this is the fourth generation of anaerobic adhesives anaerobic adhesive, it features not only retained the anaerobic curing properties, but also to better overcome some of the weaknesses of anaerobic adhesives, make it better adapted to the production development needs.
China since the early 1970s, research and development of anaerobic adhesives, there have been many brands of investment applications, to continuously improve its performance, some new varieties, such as anaerobic adhesives and other micro-capsules have also been developed, our performance and Loctite anaerobic adhesives is close or similar products. The variety series DICP, Chinese Academy of XQ-1, XQ2, Y a 15lo, V8 pair of Tianjin Synthetic Material Research Institute YVl01 #, YVl20 #, YY-301 #, rYY-302 # etc., Shanghai University of Technology, KE 1, Chinese Academy of Sciences Guangzhou Institute of Chemistry of KYY_1, KYY_2, GY-340, etc., Shanghai Chemical Sunbeam # 300 of anchor, anchor 350 # and so on. Has formed several large series products such as GY series, 300 series anchor, ZY series, HH series, QS series. The manufacturer places Dalian, Guangzhou, Shanghai, Yantai, Shandong larger production.
In recent years, with industrial development, special anaerobic adhesives are also emerging, such as the continuous line of production operations to adapt to needs of fast-curing anaerobic adhesive j oil, water, heat, impact resistance and other special requirements of anaerobic adhesives are there is a product for sale.
Anaerobic adhesive formulations
From the anaerobic adhesive composition can be seen, anaerobic adhesive is acrylic monomer, initiator, promoter, stabilizers, plasticizers and other additives are made of. Merits of the performance of anaerobic adhesives, the key is formula design.
Acrylate monomer is the main component of anaerobic adhesives, including acrylic or methacrylic esters or some special dual acrylate such as hydroxypropyl methacrylate.
The experiment and experience that the ratio of acrylate monomer to be accounted for more than 90%.
Initiator dosage of 1% to 5%, depending on performance requirements may be, anaerobic adhesives commonly used initiators: cumene peroxide, tert-butyl peroxide, tert-butyl benzoic acid peroxide, cumene hydrogen peroxide, tert-butyl peroxide, 2,5 - dimethyl-2 ,5 - two hydrogen peroxide hexane, which is the most commonly used cumene hydrogen peroxide, the addition amount of about 5%.
Accelerator is when the polymerization initiator to accelerate curing, and does not react during storage of substances, such as nitrogen, sulfur and transition metal compounds. Anaerobic adhesives commonly used accelerator: dimethyl aniline, dimethyl aniline, triethylamine, C diamine, triethanolamine, dimethyl formamide, benzene, hydrazine, tetramethyl thiourea, twelve carbon and sulfur urea and so on. Which is commonly used nitrogen-containing organic amines. Under normal circumstances, increase the amount of accelerator to accelerate the curing rate of rubber, but excessive use will affect the adhesive's shelf life. To resolve this contradiction can be paired with surfactant enhancers used this way to shorten the curing time without affecting the stability, but also to broaden the scope of application of anaerobic adhesives.
Stabilizer is to improve the storage stability of the anaerobic adhesive to join, and its use of the grass is about 0.01%, a commonly used stabilizer hydroquinone and Benzoquinone and so on. The formula by adding thickeners to increase the toughness, adjust viscosity. Other additives include plasticizers, thixotropic agents, fillers, etc., should be considered uses.
Anaerobic adhesives are mainly classified according to their use: thread locking adhesive; cylindrical retaining adhesive; surface sealant; pipe thread sealant; structural adhesive; vacuum impregnated plastic.
Advantages and disadvantages of anaerobic adhesives are as follows.
Advantages: ① not contain organic solvents, odor; ② single component, easy to use; ③ outside the specimen is not cured adhesive and easy to clean with solvent; ④ fast curing at room temperature; ⑤ shrinkage after curing.
Disadvantages: ① the workpiece clearance, air and other factors on curing a great impact; ② does not apply to plastic substrates, and most other non-metallic materials; ③ packaging, storage requirements are relatively high.
Basic concepts of anaerobic adhesives
Anaerobic adhesive bonding is able to play, the role of fixed and sealed a series of anaerobic curing characteristics of the composition of the material, hereinafter referred to as anaerobic adhesives. Anaerobic adhesives (anaerobe) also known as anaerobic adhesive, anaerobic adhesive, rubber thread, rubber machinery.
It is in contact with oxygen or air is not cured, once cut off the air after the rapid polymerization into solid-like cross-linked polymer. The so-called "anaerobic" refers to the use of this glue does not require oxygen.
Main varieties of anaerobic adhesives
Anaerobic adhesives are composed by a variety of ingredients, especially the single ever-changing, the changes in each component of which are likely to acquire new properties, so many varieties of anaerobic adhesives, their classification is not uniform. Under normal circumstances can the structure of monomer, monomer type and strength, viscosity classification, there are also classified according to use, the more common classification is based on the monomer structure and use classification. Specifically, according to their structure can be divided into four categories.
(1) dimethyl ether type to shrink four glycol methacrylate three as the representative structure.
(2) alcohol ester of a double common multi-glycol methacrylate esters (such as the United States with Loctite 290 and bisphenol A fumarate mixture of unsaturated polyester Loctite 271, Loctite 277, etc.) hydroxyethyl methacrylate or hydroxy-propyl (such as domestic anchor 302, Japan's three key 1030.) and so on.
(3) it is a variety of structural epoxy ester and epoxy acid methyl C Sui reaction products. Common are bisphenol A epoxy esters (such as domestic Y-150, GV340, etc. is more than diethylene glycol ester and epoxy ester mixture)
(4) it is a polyurethane isocyanate, methacrylic acid hydroxyalkyl esters and polyol reaction products (such as the United States, Loctite 312, made the GY-168, anchor 352 and BN-601, etc.). In fact many of the products of anaerobic adhesive mixture, or composition of complex objects, it is difficult to simple classification. .
Use can be divided into the locking and sealing fasteners, pipe fittings and flange sealing, bonding and other solid support and plugging infiltration. This classification method is simple, easy to remember to use, especially easy for users to accept. Although there are several types of plastic use, but there is always a major use as a basis for classification.
Anaerobic adhesives applications
The main applications of anaerobic adhesives: mechanical assembly, petrochemical, electronics, electro-acoustic electromechanical
(1) assembly of electrical machinery, machinery, automobile and aircraft manufacturing industry in the manufacture of machine parts assembly or locking screws, each scarf axis fixed, threaded pipe joints and threaded sealing plug, sealing the engine plane , engine castings and other larvae L needle infiltration sealing.
(2) Petroleum and Chemical flat sealing flange and pipe thread sealing.
(3) small electronic components, electronics and printed circuit board adhesive (UV curing anaerobic adhesive).
(4) electro-acoustic electromechanical speaker, DC motor magnet bonding structure.
The company: cyanoacrylate instant glue, surface treatment agent, thread locking agent, special rubber solid cylindrical parts, ultraviolet UV shadowless glue, UV light therapy nail glue, UV equipment, UV lamps, epoxy resin AB glue, propylene acid green and red AB glue, two-component epoxy structural adhesive, electronic potting AB glue, PU Crystal Epoxy, RTV silicone electronics, grease, three anti-paint, screws, glue / anaerobic, electronic yellow gum, red gum, vinyl, white plastic, PVC-ABS plastic glue, green glue, water-based glue, embroidery spray, strong glue, oil, water-based screen printing glue, double-sided removable gel-point, single-sided removable double-sided adhesive, dispensing devices, dispensing supplies, AB glue mixing nozzle, dispensing nozzles, AB Hose, N, stickers removable adhesive glue and other imports.
Import Adhesives: Loctite instant adhesive, Loctite surface treatment agent, Loctite thread locking agent, Loctite solid cylindrical parts special glue, Loctite structural adhesive, Loctite anaerobic adhesive surface sealing, pipe thread sealant Loctite, Loctite silicone rubber, ultraviolet UV shadowless Loctite glue, Loctite structural adhesive, Loctite pipe thread sealant, Loctite thread locking agent, Japan Shin-Etsu Silicone, Japan's Toshiba Silicone, Dow Corning silicone United States, Japan, Sony WHITE, Japan's three key screws rubber, AA super Japanese Aron hair gel, hair glue Aron, Aron hair without bleaching glue, Araldite AB glue, glue the U.S. 3M, 3M adhesive tape, silicone hard to fight the Japanese Shi Min, Shi Min hit 8008 hard glue, silicone adhesive, glue Taiwan Changchun
Metal glue: thread locking agent, solid special plastic cylindrical parts
Craft glue: cyanoacrylate instant glue, UV UV shadowless glue, epoxy resin AB glue, green and red acrylic AB glue, two-component epoxy structural adhesive
E-glue: cyanoacrylate instant glue, surface treatment agents, electronic potting AB glue, PU Crystal Epoxy, RTV silicone electronics, grease, three anti-paint, screws, glue / anaerobic, electronic yellow gum, red gum , vinyl, white plastic, PVC-ABS plastic glue
Glue printing industry: oil, water-based screen printing glue, double-sided removable adhesive points, N, removable glue paste |
