What kind of modified rosin is used in ink?

Rosin resins include rosin soap, rosin resin, rosin modified resin and maleic anhydride modified rosin resin rosin soap has lime rosin, which is made of rosin and calcium hydroxide hot melting, has good oil solubility and solvent solubility, and is mainly used as a raw material for lacquer. Rosin esters include glycerol (pentaerythritol) esters of glycerol rosin and maleic anhydride rosin adducts. Rosin ester is a light yellow transparent solid, which is an important raw material for lacquer, and the dryness, hardness and water resistance of the varnish made from it are improved.

Rosin modified phenolic resin is a soluble phenolic resin generated by phenols and formaldehyde in the presence of alkaline catalyst, and then reacts with rosin to obtain a reddish-brown transparent solid resin by glycerol esterification, using different phenols (phenol, diphenol propane, etc.) can obtain various resins with different properties, the softening point of modified phenolic resin is 40-50 higher than rosin, good oil solubility, and is an important raw material for paint making and ink industry. Rosin resin is an oil-soluble resin, and the commonly used solvents are esters, vegetable oils and turpentine. A rosin-based resin with water-soluble characteristics that can be used in the manufacture of water-based inks and binders.

2402 p-tert-butylphenol formaldehyde resin is an oil-soluble pure phenolic resin prepared by polycondensation of p-tert-butylphenol and formaldehyde under alkaline medium. Soluble in butyl acetate, xylene, vegetable oil.

Rosin modified phenolic resin is the main representative of resin for lithographic ink, and it is also the most commonly used and largest type of resin in printing ink. Resin 、.. with dry oilIn addition to certain applications in coatings, adhesives and other fields, rosin modified phenolic resin is mainly used in lithographic inks and sheetfed lithographic inks.

It can be used in papermaking, soap making, paint, ink, building materials, electrical appliances, food and other aspects, and there is a detailed introduction on the Internet.

According to the raw materials used in the modification of rosin and the process route of synthesis, there are mainly the following categories of rosin modified resins. The carboxylic acids in rosin undergo a carboxyl reaction; and metal oxides or hydroxides are neutralized at high temperatures to form a derivative resin acid metal salt, also known as rosin soap. Rosin esterification with alcohol, which can improve the properties of rosin and expand its use, the resulting product is also called rosin polyol ester, which is mainly used in the production of hot melt adhesives and adhesives.

After the condensation products of aldehydes and phenols are added to rosin and modified with polyol lipidation, the synthetic resin can be called rosin modified phenolic resin, which can be well wetted with pigments due to its unique honeycomb structure, and is widely used in phenolic paint, phenolic adhesives, lithographic offset printing inks, etc. The modified resin obtained by polyol esterification of the adduct of rosin and maleic anhydride is called rosin maleic anhydride polyol ester, of which there are more maleic rosin products. It is mainly used in paint, ink and other industries, and can improve the drying of the coating film, good water resistance, and high hardness, especially in the hot-melt road sign paint.

In the presence of a catalyst, the disproportionated rosin obtained by the disproportionation reaction of rosin by the action of inorganic acids and heat. It is mainly a mixture of dehydrorosin acid, dihydrorosin acid and tetrahydrorosin acid, etc. It is not susceptible to oxidation by air.

Its sodium soap or potassium soap is used as an emulsifier for emulsion polymerization. It does not affect the polymerization speed, and makes the resulting synthetic rubber have excellent viscosity and physical and mechanical properties. The polymerized rosin obtained by the action of halides, metal halides or inorganic acids makes rosin polymerize after the reaction.

Mainly dimers. After the reaction, the unsaturation decreases, the acid value decreases, the antioxidant properties increase, and the softening point increases. The hydrogenated rosin obtained by the hydrogenation reaction of rosin has a brown appearance and a softening point of 79 85.

Low brittleness and not easy to oxidize. It can be used as a tackifier in hot melt adhesives, softeners and plasticizers for synthetic rubber, coatings, inks, pigments, electronic industry, paper and soap, etc.

The main ingredient of rosin is rosin acid.

There are two types of rosin and 3 kinds, namely glycerin rosin, pentaerythritol rosin and pentaerythritol polymerized rosin. Glycerin rosin can be soluble in aromatic and aliphatic hydrocarbon solvents and dry oils, and has good wettability to pigments, but it is not suitable for liquid inks due to poor solvent release. Pentaerythritol rosin conjunctiva is hard, fast drying, high conjunctival gloss, solvent release is fast, and its properties are stronger than glycerol in water, alkali, gasoline and other aspects.

Pentaerythritol polymerized rosin can be directly used in cheap photogravure inks to make varnish, and its lipid is more widely used, and has the potential to replace glycerin rosin and pentaerythritol rosin.

The chemical composition of rosin is different from one batch to another, but the general molecular formula is C19H29COOH. It is mainly composed of rosin acid (70-85%) and piperic acid (10-15%). Rosin contains several percentages of unsaponifiable carbohydrates.

This is based on the fact that the offset ink is ultimately used in the offset printing machine. The principle of offset printing is oil-water separation, and if other resins are used, the oil-water separation effect cannot be achieved at all. And because of the unique honeycomb structure characteristics of rosin modified phenolic resin, it can be well wetted with pigments, and can be properly reacted with gelling agent to obtain a certain viscoelastic connecting material, which is widely used in lithographic inks.

However, if the use of rosin modified phenolic resin is mixed with other resins, it may affect the printing effect a little.

Uses of rosin:

Rosin is not as good as an ingredient in any varnish and pigment, but since it is one of the cheapest raw materials, it has been used as an adulteration of varnish and pigments. In addition, rosin has many other uses in the arts, such as bonding, sealing, and other mechanical effects.

Rosin refers to the substance after the distillation of pine resin. Solid, transparent, insoluble in water, soluble in alcohol, hard and brittle, pale yellow or brown. It is an industrial raw material for the manufacture of paint, soap, paper, matches, etc.

Rosin is the oil flowing out of the trunk of the pine tree at high temperature melted into water, and after drying, it becomes a lumpy solid (no fixed melting point), its color is burnt yellow and dark red, it is an important chemical raw material, and it is mainly used as a flux when soldering circuit boards in daily life, and in terms of musical instruments, rosin is smeared on the bow hair of the erhu, violin, horse-head qin and other strings to increase the friction of the bow hair on the string.

For learning ballet, rosin plays a non-slip role.

Characteristics of rosin in various countries:

1. French rosin.

The common characteristic of French rosin is that it is smooth and the bow hair does not grasp the strings. Therefore, when playing the violin with such rosin, you will feel that there are more vowels than consonants, and it is difficult to have explosive capsules. This kind of rosin is very suitable for Rabaha, Mozart, Strauss, or Fabi performance, or chamber music, teaching recordings, etc.;

And if it's a Russian style, Rapaganini, Brahms, Tchaikovsky, or any crazy modern work, or a difficult technique like a ligano bow, French rosin is simply a disservice. It will make you feel that the more the rosin is smeared, the more slippery it becomes, and the older the bow hair feels, even if it is a new one.

2. English rosin.

English rosin is the opposite of French rosin, which is very gripping with the strings, especially the light color of the hard rosin, which feels like it can almost scratch the skin of the strings. Whether it's jazz, pop, country or modern**, this rosin is simply enjoyable.

Russian virtuoso will feel good about Lapaganini, Brahms, Tchaikovsky, or any crazy modern piece, or difficult technique like the Lianton bow.

3. German rosin.

First of all, in terms of raw materials, German rosin is generally darker than French rosin or American rosin. (It can be understood that it is softer and sticky) German rosin gives me the feeling that the sound is relatively pure when grasping the strings, and it is generally a little nasal, like having a slight cold.

Or that the sound does not come out of the case directly, but is separated by a thin membrane, or there is a slight feeling of adding a mute.

In short, the use of rosin should be tried and compared, and a variety of different strings are suitable for a variety of different rosins, and a variety of different strings (steel strings, nylon strings, sheep intestine strings) are also targeted for rosin.

Rosin is an important chemical raw material, which is widely used in various industrial sectors, and its main uses are as follows:

1. Soap industry Rosin is steamed with soda ash or caustic soda to form rosin soap. Rosin soap has great detergency, is easily soluble in water, can dissolve grease, and is easy to foam. Rosin is sticky, which makes soap less susceptible to cracking and rancidity.

2. Paper industry Rosin is used as papermaking rubber in the paper industry. Rosin and caustic soda are made of rosin sodium soap, that is, rubber, which is mixed with pulp and added to alum, so that rosin becomes insoluble in water free resin acid particles attached to small fibers, when the pulp is rolled and heated on the drying cylinder, rosin softens and fills between the fibers, this effect is called "gluing" or "sizing". When the paper is "glued", it enhances water resistance, prevents ink penetration, improves strength and smoothness, and reduces stretch.

3. Paint and coating industry rosin is soluble in various organic solvents, and easy to form a film, shiny, is one of the basic raw materials of paint and coating. The function of rosin in paint is to make the paint bright color, dry quickly, and the paint film is smooth and not easy to fall off.

4. Ink industry Rosin is mainly used as a color carrier in printing inks and enhances the adhesion of ink to paper. If rosin is not used in the ink, the ink will be dull and blurry.

5. Adhesive industry Adhesives with rosin ester and hydrogenated rosin ester as the basic raw materials are often used as hot-melt adhesives, pressure-sensitive adhesives and rubber tackifiers.

6. Rubber industry Rosin is used as a softener in the rubber industry, which can increase its elasticity. Disproportionated rosin potassium soap can be synthesized.

7 Food industry Hydrogenated rosin glycerides are heated and melted together with natural sugar gums, waxes, vinyl acetate, etc., and then mixed with spices, sugar and pigments to make chewing gum. When slaughtering pigs, cattle and sheep in slaughterhouses, the hair left on the body and head of the animal can be removed with a depilatory agent consisting of 88-94% molten rosin and 6-12% cottonseed oil after being operated by depilatory machinery.

8. Electrical industry: 35% rosin and 65% bright oil are used as insulating oil on the cable as a protective film, which plays the role of insulation and heat resistance. Rosin is mixed with bakelite and other man-made resins for insulating varnishes.

9. Building materials industry Rosin is mainly used as concrete foaming agent and floor tile binder in the building materials industry. Rosin is also used as a binder for vinyl chloride asbestos tiles. Rosin and flax oil, calcium carbonate, charcoal, pigments, etc. are mixed together to make carpet tiles.

It can be used on solder, it can be used on the bow of violins, etc., mainly flux and friction. It can also be used as a medicinal herb or as amber.

Uses: Mainly used in inks, adhesives, paints, coatings, fluxes, synthetic resins, etc.

Product features: Polymeric rosin is a modified product of rosin, containing abietic acid resin dimer. It has the characteristics of high softening point, non-crystallization, excellent antioxidant properties, and higher viscosity in organic solvents.

Rosin is a type of pine resin that can be obtained from pine trees. Mouths are cut on pine trees so that the high-viscosity secretions are distilled and extracted. This volatile liquid is pine perfume; The remaining hard resin is called rosin.

Rosin is solid, transparent, insoluble in water, soluble in alcohol, hard and brittle, pale yellow or brown.

Rosin is one of the cheapest ingredients of varnishes and pigments, so it is often used as an adulteration for varnishes and pigments. In addition, rosin has many other uses in the field of art, such as bonding, sealing and other mechanical functions, and is also an industrial raw material for the manufacture of paints, soaps, paper, matches, etc.

Rosin is divided into three types: resin rosin, wood rosin, and oil slick rosin. Resin rosin, also known as relaxation incense, has a light color, a large acid value, and a high softening point; Wood rosin, also known as extracted rosin, is not as good as lipid rosin, dark in color, small in acid value, and easy to crystallize from some solvents; Slick rosin is also known as tall oil rosin. Rosin is two kinds of transparent and brittle solid natural resins, which are relatively complex mixtures, composed of resin acids (abietic acid, sea pine acid), a small amount of fatty acids, pine anhydride and neutrals.

The main component of rosin is resin acid, accounting for about 90%, the molecular formula is C19H29 Cooh, and the molecular weight. Resin acid is the most representative rosin acid, which is an unsaturated acid containing conjugated double bonds, strongly absorbing ultraviolet light, and can be automatically oxidized or induced after oxidation in the air. The appearance of rosin is pale yellow to light brown, with a glassy luster, with a turpentine odor and density.

The melting point is 110 1 35, the softening point (global method) is 72 76, and the boiling point is about 300 (. Glass transition temperature tg-30-38. Refractive index.

Flash point (open cup) 216. The ignition point is about 480 500. It is easy to oxidize in the air and darkens the color.

Soluble in ethanol, ether, acetone, toluene, carbon disulfide, dichloroethane, turpentine, petroleum ether, gasoline, oil and alkali solution. Reduced solubility in gasoline. Insoluble in cold water, slightly soluble in hot water.

Rosin has excellent properties such as viscosity, emulsification, softening, moisture-proof, anti-corrosion, insulation, etc., but the disadvantage is that the crystallization tendency in the solvent is large. The crystallinity of rosin is due to the difference in the solubility of the isomers in some solvents and the moisture in rosin. The moisture content of rosin is not crystallized; > easy to crystallize; > heavily crystallized.

Rosin crystallization is one of the important problems affecting the quality of rosin, which can cause flocculent or precipitate small particles in the adhesive, and also make the glue opaque. The crystallinity of rosin can be detected by the following method: take log rosin L fragments and 10ml of acetone and put them in a test tube, plug tightly, dissolve and stand still, if the crystallization is precipitated within 15min, the rosin is easy to crystallize; If it is precipitated after 2 hours, it indicates that this rosin is not easy to crystallize and can be used with confidence.

The quality of rosin depends on the color, acid value, softening point, transparency, etc. Generally, the lighter the color, the better the quality; The higher the rosin acid content, the greater the acid number and the higher the softening point.

The viscosity of rosin is very good, especially the pressure sensitivity, fast stickiness, and low temperature stickiness are very good, but the cohesion is poor. Because rosin contains double bonds and carboxyl groups, it has strong reactivity, so it is relatively unstable to light, heat and oxygen, showing poor aging resistance and poor weather resistance, and is prone to chalking and discoloration. Rosin is divided into special,

There are 6 levels 1, 2, 3, 4 and 5.