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Recently, there has been an increase in the use of pasted surface finishing materials with pressure sensitive adhesives (PSA), such as interior/exterior materials for buildings, interior design materials, advertising materials, etc. Conventional oil-based adhesives discharge residual solvents into the air for a long time after construction. As a result, residents of buildings suffer from symptoms such as headaches, eye, nose and throat irritation, cough, itching, dizziness, fatigue, reduced concentration and when exposed to such residual solvents for a long time, suffer sick house syndrome, which causes respiratory diseases, heart disease, cancer and so on.

For these reasons, water-based emulsion pressure-sensitive adhesives using water as a dispersion medium, which are environmentally friendly and do not emit harmful substances, have received widespread attention and are rapidly replacing conventional oil-based adhesives. Because the viscosity of the adhesive is independent of the molecular weight of the polymer, this water-based emulsion pressure-sensitive adhesive can use polymers with higher molecular weight than solvent-based polymers and can have a wide concentration range of solid content.

In addition, water-based emulsion pressure-sensitive adhesives can have low aging resistance, low viscosity, good bonding strength in the low solid content range, and good compatibility with other polymers.

However, due to the use of water as a solvent, this water-based emulsion adhesive has a slow drying rate, low bonding strength against hydrophobic bonding surfaces and non-porous materials, a narrow range of curing agent selection, and an deteriorated initial bonding strength. In addition, water-based emulsion adhesives contain emulsifiers and dispersants, and therefore do not have superior physical properties (e.g., low water resistance) than oil-based adhesives. In particular, because the fabric itself adheres to a lot of dust, water-based pressure sensitive adhesives used for clothing are difficult to have good adhesion properties, and after adhesion, pressure sensitive adhesives adhere to the fabric more often than labels. In particular, it is necessary to develop a pressure-sensitive adhesive that has excellent bonding strength for clothing fabrics while cleanly removing it from the substrate. However, since the two properties are opposite to each other, if the performance of one of them increases, the performance of the other decreases, making it impossible to satisfy both properties.

In addition, pressure-sensitive adhesives are exposed to high temperatures and humidity during transportation and movement in export containers after adhesion to the fabric substrate. During the process, there was a problem of adhesive sticking firmly to the clothing. In the case of conventional water-based pressure-sensitive adhesives used on clothing, the peeling strength rapidly increases to approximately 3 to 5 times the initial peeling strength, resulting in damage to clothing.

The traditional polymer material industry with petroleum resources as raw materials has brought great convenience to human production and life, but the problems brought by plastic pollution and excessive consumption of resources have become more and more bottleneck hindering its development. The discovery and use of natural compounds as polymeric monomers is helpful to get rid of the excessive dependence on petroleum resources, which has become a research hotspot in the field of polymer materials synthesis.

The traditional acrylic pressure sensitive adhesive is prepared from acrylic monomer based on the petrochemical industry, which will inevitably accelerate the accelerated consumption of petroleum resources, which are non-renewable or difficult to renewable resources, excessive exploitation will lead to the depletion of earth resources. In recent years, the focus of research has been turned to acrylic monomer raw materials based on biorenewable sources and gradually industrialized.

The production of bio-based acrylate monomers is generally based on the catalytic esterification reaction of alcohols extracted from plants and acrylates based on the petrochemical industry. The sources of bio-based alcohols are usually natural products such as vegetable oil and bornol. These materials are abundant and reproducible, which is in line with the sustainable development strategy. Therefore, it is necessary to develop a renewable pressure sensitive adhesive and its preparation method.

The technical solution adopted here is to provide a renewable pressure sensitive adhesive: The acrylate copolymer comprises an acrylic monomer with a high biobase content of 60 to 87wt %, a non-polar monomer with a high biobase content of 10 to 30wt %, a polar cross-linked monomer with a value of 3 to 10wt %, The sum of the high biobase content acrylate monomer, the high biobase content non-polar monomer and the polar crosslinked monomer is 100wt %.

BOPP tobacco packaging film is a kind of film with higher technical content in BOPP film. Compared with ordinary BOPP thin film, it has higher elastic modulus, tensile strength, stiffness, optical properties, heat sealing strength, antistatic properties, etc.

Antistatic property is a important standard to measure the quality of tobacco film. The film with static electricity is easy to absorb dust, so that the surface of the film is dirty: static electricity affects the normal operation of film production, serious will hurt the operator: electrostatic film affects the normal production of cigarette packaging machine, cigarette pack appears pulling line, borrowing, long Angle, packaging is not compact, serious flying bag phenomenon affects the normal production of tobacco factory. It can be seen that eliminating static electricity is of great significance for BOPP smoke film.

First, BOPP smoke film electrostatic mechanism:BOPP film and other commercial molecular materials, have excellent insulation performance. The chemical bonds of polypropylene molecules in the material are covalent bonds, which are not easy to ionize and cannot transfer electron ions, so that the surface of the film has a high surface resistance. When different materials touch and rub together, they accumulate a large amount of electrostatic charge on the surface. When two materials are separated, each material has a certain amount of positive (negative) charge.

Two, the principle and method of electrostatic elimination rod to eliminate static electricity:

Electrostatic eliminator has induction type, DC discharge type, AC discharge type, etc. BOPP production line, film cutting equipment, tobacco packaging machines will use electrostatic eliminator to eliminate static electricity. The advantages of electrostatic eliminator are convenient to use, low price and easy to operate: the disadvantage is that it is only applicable to the surface of the film electrostatic large, partial elimination of the surface static electricity.

1. Induction type electric eliminator: is a kind of grounded conductive electronic brush, through the electronic brush close to the charged film, the tip of the ionized air, generated and charged film electric type of the opposite charge and the film with the charge neutralization, and charged film electric charge is through the electronic brush into the ground, so as to eliminate static electricity. This type of static eliminator is commonly used in BOPP winders. Can release part of the film production process of static electricity.
2. Dc discharge electrostatic eliminator: is a needle electrode, the opposite electrode through the direct current between the needle electrode and the film corona discharge, produce ions of opposite polarity, neutralize the surface charge of the film. Some cigarette packaging equipment strip packaging part will use such electrostatic eliminator.
3. AC discharge electrostatic eliminator: It is widely used in film scutters by forming capacitive coupling body, periodically generating ions and attracting ions to eliminate static electricity.

Second, the influence of static electricity on the use of smoke film and emergency methods

There are two main ways of BOPP smoke film static electricity: 1, BOPP film production process due to the friction between the film and the equipment generated static electricity; 2. Static electricity generated by friction between finished cigarette film and cigarette machine packaging equipment in the process of use.

After the production of tobacco film is completed and sent to the tobacco factory, the sensitivity of the packaging process to static electricity is also different due to the differences in environmental changes and packaging equipment.

1. Impact of different environmental changes: geographical locations are different. Tobacco factories located in northern inland areas are often troubled by the problem of film static electricity due to the dry climate, especially in winter: tobacco factories located in coastal areas along the river are relatively humid, and the thin mold is not easy to produce static electricity. When the environmental conditions of smoke film production and use are very different, it is particularly important to control the temperature and humidity of smoke film storage and use. Cigarette materials are used more, cigarette paper, rosin paper and other requirements of drying conditions, and cigarette film requirements of large humidity conditions, more difficult to balance, generally with the temperature of 30C, 60% degeneration is appropriate.
2. Impact of equipment differences: At present, there are a variety of packaging equipment in the tobacco industry, including GD, BE, FOKER and other packaging equipment. The machine speed generally ranges from 180-400 packs/minute, and even some of the equipment can reach 600 packs/minute. Generally speaking, the faster the packaging speed, the more sensitive to static electricity. For example, GD is packaged at a slow speed, and the effect of static electricity on the packaging is reflected in the irregular sealing of the top and bottom of the cigarette pack. After the speed is increased to a certain extent, the phenomenon of flying bag begins to appear, and the film cannot be used on the machine.

Is it not true that some small partners often encounter the problem that they do not know what kind of material they should choose when choosing self-adhesive materials? Do not know the difference between the common PE BOPP PET adhesive three, resulting in the selection of difficulties? So today this article will tell you the difference between PE BOPP PET adhesive three.

PET is the abbreviation of polyester film, it is a kind of polymer material. PET adhesive has good hard brittleness and temperature resistance, can resist the harsh environment, acid and alkali and other chemicals corrosion, very suitable for outdoor and high quality requirements of the sticker label.

The common types are matte silver sticker, matte white sticker, bright silver sticker, bright white sticker and transparent PET sticker. PET adhesive stiffness is good, flick will have a sound.

PE is a kind of environmental label material, which develops rapidly and has good softness. It is suitable for sticking on a curved surface, and the label edge is not easy to wrinkle. In addition, many cosmetics and shampoo are filled with PE bottles, and the PE material of the label will provide convenience for recycling.

Another benefit of transparent PE material is that it itself has a foggy feel, and printed labels have a soft effect and look very advanced. But because polyethylene molecules do not contain polar groups, high crystallinity, low surface tension, so the printing performance of the film is poor, ink and adhesive adhesion is poor, need to be printed and composite before the need for surface treatment.

BOPP film self-adhesive label is widely used in transparent bottle body, daily chemical shower gel, daily chemical shampoo, daily chemical laundry liquid, cosmetics and other daily chemical products.

BOPP film adhesive label high hardness, tensile resistance. And light permeability is good, with good durability, good transparency, waterproof and oil proof, tear wear-resistant, clear printing, bright color saturated, uniform thickness, glossy sense of flexibility.

BOPP is the abbreviation of BiaxiallyOriendPolypropylene, film is two-way stretch polypropylene film film is a kind of very important soft packing material, film colorless, odorless, tasteless, non-toxic, and has a high tensile strength, impact strength, rigidity, strong toughness and good transparency.

BOPP film production is the polymer polypropylene melt first through the long and narrow head into sheet or thick film, and then in the special stretching machine, at a certain temperature and set speed, at the same time or distribution in the vertical of the two reverse (vertical, horizontal) tensile, And after appropriate cooling or heat treatment or special processing (such as corona, coating, etc.) made of film.

BOPP classification and application, according to the use can be divided into:

Ordinary type: also known as light film, flat mold. For printing, composite (transparency, extinction type), coating (adhesive tape and PVDC coated film base film). It is the most widely used film products, the largest production variety: printing film, composite film, tape film, bag film, extinction film, etc., are flat film.

Heat sealing type: used for ordinary packaging, such as cigarette packaging film, three layers of heat sealing film, five layers of air blocking film, pearlescent film, coated heat sealing film, etc. : heat sealing film, laser film, belongs to the heat sealing film.

Label film: for commodity labels, advertising printing, written magazines, bottle labels and overall packaging, etc. : Metallized film: for vacuum aluminum plating: capacitor film: for capacitors and metal capacitors.

Subdivision of membrane types:

BOPP ordinary film, also known as light film, is suitable for food packaging, paper composite and general packaging printing composite, is the largest amount of BOPP products. Flat film, also known as light film, is bidirectional tensile polypropylene film (BOPP film) series of products in one of the most common film, is widely used in all kinds of printing, composite products for a variety of food, goods packaging. Among them, the 15dm thickness of the flat film is mainly used for books and other paper composite.

In the consumption of light film, plastic bag film occupies a large proportion, quite a few film factories will be the tape film as the main product. The production of belt film has such characteristics as large yield, simple process and low technical requirements.
Although the overall use of smoke film matte film is not big, it is the most profitable products in BOPP film. The characteristics of cigarette film production and sales, high technical requirements, large entry cost.

Matte (matte) film

Matting film is a kind of plastic matting product with low gloss (glossiness less than 15) and high fog into diffuse matting effect. It has the characteristics of paper-like appearance, realistic reproduction of color in printing and comfortable feel. Matting film is a film made by bidirectional stretching of matting master material on a single surface. The surface of the matting film looks like paper and natural products. It is mainly used for the composite of books, time-penalty, annual report covers, cardstock and other papers. Another use is to cooperate with polyethylene film, casting polypropylene film, BOPP film, pearlizing film, metallized film and other packaging.

Single and double sided heat sealing film

The heat-sealing film is divided into two kinds of single-side heat-sealing film box two-way heat-sealing film. It is a polypropylene heat-sealing film (BOPP heat-sealing film) made of heat-sealing master material on the surface. It is mainly used to experience the heat-sealing packaging of food, medicine and other electrical components. It is divided into two kinds: single-side hot sealing and double-side hot sealing. Single-side hot sealing film is used for general purpose single-side hot sealing packaging. It is cheap and printable. Mainly used for compound, printing, bag making and so on.
Pearlescent film

White opaque BOPP pearlescent film has a silky texture, soft and pleasant pearl luster, low density, excellent flatness, gas barrier, can be widely used in dried fruit, ice cream, candy, high-end soap, gifts and other direct packaging, at the same time it is a better printing base. In the surface printing can not carry out the full version of the base, therefore, BOPP pearlescent film is highly favored, compared with the ordinary BOPP film, BOPP pearlescent film has three typical characteristics: emit pearlescent luster, good shading, (especially for UV light barrier) and low density. In particular, the first two characteristics show that BOPP pearlescent film is remarkable, so that it enters the high-end market in the field of packaging, bringing considerable economic benefits for manufacturers.