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Fireworks adhesive products can be roughly divided into their functions according to their functions: paper tube glue, compound glue, fireworks base glue, rocket product special glue, firework fire fuse positioning glue, PVC sunroof glue, film coating (glazing) carton sealing glue , Cover (covering) skin Zhaojiao plastic, plastic blisters plastic, fireworks subtitles positioning plastic, strong rubber powder, as well as a variety of specifications and uses of pressure-sensitive tape products, and other major products. According to its components, it can be divided into silicates, polyvinyl formals, polyvinyl acetates and copolymer emulsions, solvent rubbers, resins, EVA hot melts, cyanoacrylates, and water-based pressure-sensitive adhesives. Classes and so on.
First, paper tube glue
Fireworks paper tube production is divided into manual reel, semi-mechanical reel, automatic mechanical reel.
The manual reeling of fireworks paper tubes has so far been adopted by many manufacturers. Workers generally use two types of adhesives: one is liquid sodium silicate (also known as silicate, and the fireworks manufacturer is also called “glass glueâ€). One is polyvinyl alcohol acetal aldehyde glue for paper tube seals. The main adhesive with scolated alkali is characterized by a good hardness and low cost of the paper tube after curing. It is used by more manufacturers, but due to strong absorbency and strong alkali of babuloic acid, in a relatively humid environment, the adhesive The layer is prone to dampness and loses its original tackiness, resulting in loose paper tubes, eroded paper by strong alkalis, loss of original paper tensile strength and surface tension, and even corrosion of lead and paper tube access leads by strong alkalis. Fall off. In addition, employees may accidentally splash into the eyes during operation and cause corneal burns. Fireworks cartons have been completely banned silicate. In order to make up for the inadequacy of scouring alkali on fireworks paper tube production, currently, Zhengzhou Liuheng City has launched a new type of hand-made paper tube glue, which not only has the hardness of babbling alkali, but also has excellent moisture-proof performance. Flat with scomel alkali. The product has been affirmed by some production companies in Liuyang.
Fully automatic mechanical reels are mainly used as polyacetal type glue for paper tube adhesives. Because the mechanical design has a storage container, the tape is evenly coated on the adhesive surface of the paper after being passed through the glue. Tubing completes the bonding process. In order to increase the hardness of the paper tube and shorten the curing time of the glue, many manufacturers add a certain amount of filler to the glue to improve the overall performance of the glue. The use of such glue as a binder for paper tube size specification, high work efficiency, paper tube is not easy to absorb moisture, non-corrosive paper, moderate hardness of the paper tube, suitable for the production of surface spray inside and outside the paper tube. In addition, the glue is adapted to the press-fitting and ball application process of the shell. However, because the components containing free formaldehyde in the glue solution and the pH of the glue solution do not reach neutrality, the workers are prone to skin allergies, itching, and cracking in the summer when they come into contact with the glue manually.
Second, the combination of plastic
Bonding of fireworks paper and paper, adhesion of rocket-type paper tubes to wooden poles, bonding of small shells to spherical spheres and column-shaped mortars, and bonding processes between various types of paper materials and paper and wood materials Vinyl acetate emulsion for bonding. The gel has a white viscous liquid appearance with a solid content of 45%-52%, a viscosity (25 degrees Celsius) of 4000-10000 mPa.s, and a pH of 4-6. The glue is cured at room temperature with good film formation, weatherability, and mildew resistance. It contains no solvents and is non-toxic and non-flammable. At present, many adhesive factories in fireworks production areas use polyvinyl alcohol as the main production glue, adding a certain amount of thickeners, tackifying materials, and fillers. The glue produced has a similar appearance to the adhesive, which is obviously low and part of the bonding process. Can be used instead of the glue.
Third, fireworks base adhesive products
The ground spray is often in the bottom of the base to connect the base to the stability of fireworks, most of the current export products use plastic material for the base products, there is also a small part of fireworks use wood as the base, this process is mostly nesting process The material of the plastic base is made of PVC (polychlorinated), PP (polypropylene), PE (polyethylene) and even mixed plastics of various ingredients. For different materials, in order to achieve the ideal bonding effect, we must choose different adhesive products and solvents. At present, the solvent-based base rubber has a high market share. Its advantages are fast curing speed and high bonding strength, but the glue is volatile, flammable, solvent odor, and difficult to clean. The product can also be applied to the socketing of plastic parts and paper tubes of rocket products. Solvent-based base rubbers have several types of products such as neoprene, SBS rubber, and resins. Its development direction is toward the development of economical and environmentally friendly water base glues. Water-based adhesive can be made into high solid content, high viscosity, strong adhesive, suitable for the bonding of paper materials and various plastic parts, and the glue is not volatile, non-flammable, odorless, non-toxic side effects to employees, the price Moderate. The rubber is not in the promotion stage. Some manufacturers in Liuyang are already in use.
Fourth, the packaging process with plastic
PVC skylight glue: There are many kinds of export fireworks. Some small fireworks are mixed and packaged in a small color printing paper box. On the side of the paper box, a hole of a different shape is opened, and the transparent PVC film is stuck in it. Can be intuitively packaged in its various colored products, referred to as a hybrid box with a skylight. This adhesive is ideal for the paste process of PVC film and carton. The PVC sunroof rubber is white jelly-like material. When it is used, it can be diluted with clear water. Use a brush to spread evenly around the opening, and then gently press the PVC film onto it to achieve the desired effect after 5 minutes. In addition, the colloid can also be poured into a soft plastic cylinder with a pointed mouth, and extruded into a uniform line around the opening, and then the film is attached, and the operation is more time-saving. This type of product can also be used as a bond between wood and plastic launchers for rocket products.
2. Laminated paper, coated carton sealing glue: With the innovation and development of fireworks packaging, the wrapping film, UV varnish, and polishing process have been rapidly promoted and applied, not only in the export of fireworks products. There are a lot of applications on the packaging. Even on the packaging of fireworks products for domestic use, products are packaged with film or glazing skins and cartons to increase the market competitiveness of their products. In the rapid promotion of these new packaging materials, it also brings about a certain amount of development space for related adhesive products.
After the paper (cardboard) is film-covered by a special laminating machine (this type of special paper-plastic laminating adhesive is not described in the following), it must be cut into a variety of fireworks packaging skins or indented into the carton shape. Seal with a special adhesive product. Some time ago, some users mistakenly used glue seals for such coated films, which caused the products to fall off after they were exported to foreign countries, causing customer claims and causing unnecessary losses to manufacturers.
Coated skin is generally a complex of copper paper and film. The manual sealing glue must achieve the following effects: 1. Strong initial viscosity; 2. Longer opening time (allows employees to open ten plastic coated papers at a time and not very Fast volatile; 3, after the curing can be achieved by the destruction of the adhesive material. There are two products available for selection; A solvent glue; B water-based paper plastic adhesive. Solvent-based glues are economical, easy to apply and hand-operated. The disadvantages are the solvent odor and the glue is volatile. Water-based adhesives have a long open time and good adhesion, but the price is high. Due to cost considerations, most of the users use solvent-based adhesives in the sealing process of the film coating.
The sealing of coated paper carton box is generally a composite of white paper and film. Because the bottom and tension of the cardboard are relatively large, the solvent sealable plastic adhesive for manual sealing can achieve the bonding effect, but the workers are more time-consuming to operate, mechanical stacking. The box must use water-based paper-plastic adhesive.
Fifth, other types of adhesive process with plastic
Large-scale fireworks subtitles and styling patterns are often affixed to pre-made fireworks paper tubes on the wood perpendicular to the ground, such paste must be easy to operate, the solid gel and prison. The ideal glue type is EVA hot melt glue stick, so glue sticks are especially suitable for quick positioning and bonding of paper and wood. When the PVC blister blister process is used to package fireworks products, since the fireworks are flammable products, heat-adhesive heat-sensitive adhesives should not be used. Therefore, cyanoacrylate adhesives can be used to achieve rapid bonding of PVC blister packaging materials and cardboard. Process.
In the main producing areas of fireworks, the development of the fireworks industry also drives the follow-up and development of related products. The use of adhesives for fireworks from past traditional flour-cooked pastes, to a large number of applications of a variety of synthetic chemical adhesive products, is sufficient to confirm the sustainable development of the fireworks industry.
As fireworks products continue to move toward low risk, environmental protection, and high-tech content development, higher requirements are placed on future adhesive products, and it can be concluded that economical, high-performance, environment-friendly and market-competitive products will be fireworks adhesives. The main direction of development.
Liuyang City, Hunan Province, Zheng Taijiao Xiao Weimin
Talking about the Application of Adhesives in Fireworks
As an auxiliary material in the fireworks production industry, adhesive products have been paid more and more attention by manufacturers in recent years. Especially in the process of exporting fireworks, various processes can not be separated from the application of adhesives. With the innovation of fireworks products and their packaging materials and the improvement of product quality inspection standards, the application of adhesive products in this field has made considerable progress. According to the consumption of fireworks accounted for 1.5-2% of the output value, in 2001 Liuyang fireworks output value of 1.9 billion, the adhesive market capacity has reached 2850-38 million. In Liuyang, the main producing area of ​​fireworks, there are a number of companies specializing in the production and operation of various types of fireworks adhesives, which satisfy the needs of different bonding processes for many manufacturers.