Analysis of Formulation, Production and Technical Requirements of Flexible Packaging Compound Rubber (2)

4, alcohol-soluble polyurethane compound adhesive formula design:

2.4.1 Formula design example:

l. Tomley TOr4MORROW PUR 1010 30.0_35.0%
2,25 acetal ketone or polyvinyl butyral 5.0-10.0%
3 TU-310 or epoxy 1.0_3%
4, additives 3.0-4%
5, mixed solvents (ethyl acetate, isopropanol, n-propanol) 50.0_60. %
Total 100%

2.4.2 Component Adjustment

We know that the alcohol-soluble polyurethane compound adhesive is composed of a polyisofluoride ester and a polymer-modified isocyanuric acid, an organic solvent, a modified silane coupling agent, and the like. Due to the presence of isocyano groups and carbamates in the molecular chain, it shows high activity and high adhesion to various flexible packaging substrates. The polymer macromolecules can form hydrogen bonds with high strength, solvent resistance and abrasion resistance. The disadvantages are poor acid, alkali, water resistance and aging resistance.

Note:

A. Technical parameters of Tuolui polyurethane resin:
1. Main Ingredients: Polyurethane
2, appearance: colorless or light-colored viscous liquid
3, solid content: 29-31
4, Brookfield viscosity @ 25cc (centipot): 600-1200
5, solvent composition: ethyl acetate + butyl acetate
6, dry (5-15S, 80cc): no sticky
7, adhesion (tape stripping test): 90 茗 above retention
8, alcohol solubility: 100%
B, alcohol polyurethane composite rubber technical parameters:
1, appearance: transparent liquid
2. Solid content: 1 5-20%
3, solvent composition: isopropanol + ethanol + ethyl ester
4, Adhesion: ≤ 90 保留 or more
5, alcohol solubility: 100%

2.4.3 Characteristics of Alcohol Polyurethane Compound Adhesive

The main features of the PUR1010 series products are benzene-free, non-ketone-free and environmentally friendly. The product itself does not contain benzene and ketone solvents, alcohol solubility is good, in the film sizing or in the ink manufacturing and use process, can all use alcohol solvents to dissolve and dilute. Therefore, it can be used as a non-benzene (non-ketone) ink binder to produce alcohol-soluble surface printing or in-printing inks for the printing of food and pharmaceutical products such as environmental hygiene requirements.

2.4.4 Typical Uses of the Product

TOMORROW PUR 1010 series products have good adhesion to a variety of films, including PP, PE, PET, nylon, PVC, PVDC, aluminum foil and various aluminized films, with alcohol-soluble aldehyde and ketone resins and nitrocellulose The auxiliary resins such as cellulose resins have good compatibility and are soluble in various solvents such as alcohols, esters, ketones, and hydrocarbons and mixed solvents, and have good dispersibility. Membrane gloss, high transparency, strong resistance to media. TOMORROW PUR 1 010 series products are excellent link materials for producing alcohol-soluble printing inks. They are suitable for compounding, compound inks, alcohol-soluble inks, clear inks, PET, and NY special inks. They can be used for flexo printing. Gravure printing, varnish printing, and many other kinds of printing are used for excellent printability, among which the shallow printing effect is particularly excellent. The disadvantage is that it is poorly compatible with other types of polyurethane resins and can only be used as a special resin for alcohol-soluble inks.

2.4.5 Health and Health

The major hazards of this resin liquid are that it is highly flammable but it is an environmentally friendly and healthy product. Detailed information on this can be found in the separate health and health information sheet. For use in food packaging, the components used in the production of TO-MORROW PUR are listed in Article 21, Items 1 75 and 1O5 of the FDA standard. The ingredients are listed in the European rule AP(06) 5 (Direction of direct surface coating of foods) ).

Tom Lai 3010 polyurethane adhesive can be used as a printing ink simply by adding pigments and fillers.

Third, deal with the advantages and disadvantages of compound glue

Whether the flexible packaging composite adhesive (composite adhesive) can meet the market demand and whether it can meet the requirements of users, the way to improve the compound adhesive formula design is:

1, to improve the stability and bond strength method is: A, use the adhesive strength and cohesion of the large resin, such as epoxy, phenolic, etc.; B, adding toughener, reduce brittleness, enhance the toughness of the adhesive layer, reduce the internal Stress; C, thermoplastic resin mixed with thermosetting resin, thermoplastic resin provides adhesion and toughness properties, thermosetting resin provides heat resistance and strength;

L0、Introduce polar groups or add a resin with good compatibility and polarity to increase the bonding strength; E、Add cross-linking agent; F, Add coupling agent; C、Add dispersant or thinner, increase infiltration Sex etc.

2, to improve the cold resistance method is: A, choose a good cold resistance resin, such as polyurethane; B, reduce the degree of cross-linking; C, add plasticizer or toughening agent; D, reduce the crystallinity: E, reduce the filling material Dosage and so on.

3, to improve water resistance is: A, the use of curing agent; B, the use of molecules containing a 04, a Ntt2, -OH, -CO0- and other groups, low water absorption, can not be easily hydrolyzed resin; C, Use a small absorbent material.

4, to improve the acid and alkali resistance is: A, a high amount of filler; B, the use of inert fillers, such as talc, silica: C, without ester plasticizers.

5, to improve the aging resistance method is: A, to increase the content of cross-linking agent; B, adding active filler; C, using high-temperature curing agent; 0, adding the appropriate amount of coupling agent: E, using water resistance or anti-aging Good link material.

6, to improve the heat resistance of the composite rubber is: A, select high temperature resistant resin, such as silicone, phenolic, etc.; B, to increase the density, such as epoxy resin benzene ring into an aliphatic ring, the introduction of phenolic resin; C Adding aluminum powder, mica powder or TR-X, etc.; D. Adding a cross-linking agent: E. Selecting a high-temperature curing agent; F. Increasing the crystallinity of the binder; G. Adding an antioxidant, such as 1010; H. Add the silicon coupling agent.

7, to improve the flame resistance is: A, adding trioxide trioxide, zinc borate and other flame-retardant fillers; B, the use of trimethylol phosphate, chlorinated paraffin and other plasticizing flame retardant; C, the use of halogen-containing resins, Rubber as a binder.
8, improve the solvent resistance method is: A, use good solvent resistance resin or rubber: B, with little or no toughener: C, increase the proportion of filler: D, increase the amount of cross-linking agent.

Everyone knows: Composite packaging materials are made up of two or more base films with different characteristics and can be produced in a variety of ways. As long as the above composite, can not be separated from the composite glue. In one word, any material that can bind two or more kinds of flexible packaging materials and make it a unified whole to achieve a certain purpose of use is a compound adhesive.

Since the combined packaged printing products are provided with basic properties such as flexibility, heat resistance, cold resistance, media resistance, hygienic properties, adhesion, tearing, etc., printing companies are more concerned with: (1) appearance; (2) transparency; (3) fluidity; (4) cold resistance; (5) initial tack; (6) sizing sizing; (7) peel strength; (8) cost, etc. It is one of the topics that cannot be solved by the manufacturer of packaging and printing adhesives.

Liu Jiaju Hunan Packaging-2006 issue 2