Flame retardant adhesives are used
With the expansion of the adhesive application field of Et benefits. In particular, Et, U.S., Canada, Western Europe, etc. have linked the application of polymer materials with safety in use, and have formulated various flame retardant standards and corresponding safety regulations. Some application fields such as aerospace, aviation, military defense, electronics, and electrical Industry, mining industry, automotive industry, civil textile industry, civil construction and even furniture manufacturing. The flame retardant of the adhesive has put forward more intense requirements. This has facilitated the study of flame-retardant adhesives and the development of flame-retardant adhesives.
1. Widely used in aerospace and aviation
Fire-retardant adhesives were first developed in the aerospace and aerospace industries. At present, the most common application is related to research reports and patent reports.
2. Potting and bonding of electrical and electronic products due to the requirements of safety technical specifications. Product heat level increase. Flame retardant requirements for the adhesive used. Such as the TV line output transformer, power supply, capacitors, high voltage package, high pressure connector and other parts are used good flame retardant adhesive. Otherwise, high voltage spark will cause a fire accident. According to relevant information, more than 95% of the fires on televisions are due to the burning of output transformers.
3, the application of printed circuit boards
Printed circuit boards are used in electrical and electronic products. In the process of manufacturing using soldering process. So use high temperature resistant flame retardant adhesives.
4, laminated board
Manufacture of decorative and flammable surface fireproofing layers. In the field of architecture, such as theaters, hotels, shops and other public places; transport vehicles such as cars, trains, aircraft, ships, etc., especially with electrical and other easy to produce sparks contact with the decorative panels and laminates. Fire-retardant properties are required both at home and abroad to prevent fire accidents caused by the spread of small fires. Flame retardant adhesives are used in large amounts in this field.
5. Plugging in vehicles and mines
In the construction of vehicles, mines and plugging, the adhesive used requires flame retardancy. Because the flammable gas generated in the construction area is not easy to spread, it not only requires the flame retardant after curing, but also does not produce flammable gas during construction.
6, is expanding in many fields of application
With the expansion of the adhesive application field of Et benefits. Fire-retardant adhesives expand in many applications. Et, Ben, U.S. and Western European countries have annual research reports and patent disclosures. The United Kingdom and Canada reported practical examples of trials of natural cement type flame-retardant sealants in potash, salt, and mines. It was reported that ventilation partitions have excellent airtightness and flame retardancy. Several Mitsubishi companies have developed several methods. Inorganic flame retardant adhesive. For metallurgical industrial refractories bonding.
Flame-retardant adhesives for the construction industry are receiving attention. Flame-retardant epoxy mortars for plugging, wiring, and decoration, flame-retardant neoprenes for indoor installation, and polyvinyl chloride rubber are commonly used in the construction industry in the United States. Flame-retardant adhesives have also been widely used in civil textile and furniture manufacturing industries. For example, waterproof adhesives for civilian windbreakers and jackets in Japan and the United States, and flame-retardant acrylate-based waterproofing agents are commonly used. The adhesives used in furniture manufacturing are basically fire-retardant varieties to ensure civil fire safety.
Method for implementing flame-retardant adhesives
According to a large number of patent analysis at home and abroad. There are generally three ways to implement flame-retardant adhesives. First to introduce
as follows:
1, the flame-retardant monomer polymerization method
Polymerization with monomers containing flame-retardant elements such as bromine, phosphorus, silicon, chlorine and the like. Such as cis-triazine benzene tetrabromobisphenol A epoxy resin; bis [3 a water-reduced phenyl] methyl phosphine oxide epoxy compound; hydroxy-terminated polydimethyl siloxane silicone rubber; chlorine Rubber, etc.
2, using flame retardant curing agent method
Such as halogen tetrabromophthalic anhydride, bromine anhydride and hexachlorophthalic anhydride. Phosphorus-containing bis (3-anilino-1 methylphosphonate, etc. The above-mentioned flame-retardant curing agent can be added to an adhesive to provide a self-extinguishing flame-retardant effect on the cured adhesive layer.
3, add flame retardant and filler method
The law applies to many types of adhesives. Various types of flame retardants are available, with wide adaptability. For example, urea-aldehyde, acrylic, rubber, epoxy-modified adhesives can be manufactured by this method.
(11 added flame retardant
This is the main method of flame retardant foreign adhesives. This method has been adopted in most of the flame retardant adhesive formulas that have been publicly reported. Commonly used organic flame retardants are divided into two types: one is a phosphorus flame retardant, the other is a brominated flame retardant, and the latter is often added with Sb20 as a combustion aid.
Inorganic flame retardants began to receive attention, and red phosphorus was reported as the flame retardant. Mostly used in the electronic-grade flame retardant adhesive formulation process. It is said to have little effect on the electrical properties of the glue. However, in the formulation examples, it is not always used alone but in combination with other flame retardants. Flame-retardant fillers are generally used in combination with flame retardants in flame-retardant adhesive formulations, but there are also many formulations that are used alone. The commonly used inorganic flame retardant filler is hydrated aluminum hydroxide.
F21 uses reactive flame retardant
Mostly used for thermosetting resin binders. Due to the high cost, few examples of formulations are used individually, and they are often used in conjunction with additives.
F31 flame retardant resin as matrix
Some elements of organic polymers and inorganic polymer compounds are flame-retardant and can therefore be used as base materials for flame retardants. However, from the perspective of foreign patented formulation process examples, there are few examples of flame retardant base materials alone, and most of them are additive flame retardants. Mixtures of flame retardant resins can also be used as an example.
In summary. Domestic and foreign adhesive flame-retardant implementation methods are characterized by: the method of flame-retardant additives to the majority. The use of reactive flame retardants and fire-retardant resin as the base material less fire-retardant methods. Generally through a large number of screening, comprehensive consideration of the use, process conditions, performance indicators, cost and other factors. Select the appropriate synergy or with flame retardant system. Choose the best glue.
Flame retardant adhesive development direction
As a new type of adhesive, flame retardant adhesives are receiving more and more attention and development.
The development direction of flame-retardant adhesives is mainly manifested in the following aspects:
1, attach importance to the characteristics of flame-retardant adhesive, carry out basic research applications Japan, Russia and Western Europe and other countries attach great importance to the characteristics of flame-retardant adhesive, carry out the corresponding basic research. These basic researches include: research on the flame retardant mechanism and flame retardant effect, the study on the compatibility and dispersibility of the flame retardant adhesive system, the research on the effect of the flame retardant adhesive on its performance, the research on the application performance of the flame retardant adhesive, and the new type Flame-retardant adhesive raw materials and other aspects. Actively carrying out these researches not only has guiding significance for the development and application of flame-retardant adhesives, but also has economic value that cannot be underestimated for reducing production costs and expanding the application fields.
2. The focus of the development is to search for excellent performance and multifunctional fire-retardant adhesives. The excellent development performance and multifunctional fire-retardant adhesives are the focus of development and research. Foreign experts believe that this is the key to the development of flame-retardant adhesives. In this regard, many research reports and patents have appeared in foreign countries. For example, the series of flame-retardant adhesive tapes developed by the 3M company in the United States, in addition to the flame retardant properties of the electronic and electrical industries, have good insulation properties and no damage to the components, and are used in spacecraft. The varieties of petroleum and electromechanical industries are both flame-resistant and heat-resistant.
Japan’s Sony Corporation studied brominated bisphenol A epoxy adhesives, blended them with acrylic cyanide copolymers and brominated vinyl phenols, and added amine or imidazole compound curing agents and non-combustible inorganic substances as fillers. Adhesives. The search for flame retardant adhesives with multiple functions has been active in foreign countries, especially in Japan, with more research reports and patents.
3, reduce production costs, the development of new flame-retardant plastic species to expand the application of flame-retardant adhesives, largely dependent on the reduction of production costs, it as the development of the central link. Has received great attention, and is a long-term development tasks and topics.
on the other hand. Judging from the current flame-retardant plastics, most of them are epoxy-based, while others are less flame-retardant. The development of new flame-retardant rubbers will directly promote the application and expansion of flame-retardant adhesives. .
In summary, the flame retardant adhesive will be applied to the basic research. The development of excellent performance and multifunctional flame retardant adhesives, as well as lower production costs, expanding the direction of development of types of plastic.