Species & Applications Of Solvents

There're many varieties of solvent, according to their chemical composition and sources, that can be divided into the following categories:

1. Terpene solvent: the vast majority of pine secretions. Commonly used turpentine, pine oil and so on. The solubility of turpentine resin to natural resin and resin is greater than that of ordinary banana water, less than benzene. The evaporation rate is moderate, in line with paint brushing and drying requirements.

2. Petroleum solvents; such solvents are hydrocarbons. Is derived from the fractionation of oil. Commonly used in gasoline, pine, water, kerosene and so on. Gasoline volatile speed, high risk, under normal circumstances not to be used as solvents. Rosin water is commonly used in paint solvents, which is characterized by less toxicity, generally used in oil paint and magnetic paint.

3. Coal solvent: This kind of solvent also belongs to hydrocarbon. Is derived from coal dry distillation. Commonly used benzene, toluene, xylene and so on. Soluble ability of benzene is very strong, is a natural dry oil, resin strong solvent, can not dissolve shellac, but toxic, volatile fast, paint is not commonly used, generally as detergent; , Mainly as alkyd solvent, can also be used as epoxy resin, paint and other thinner, a small amount used in detergents; xylene slightly lower than the solubility of toluene, volatile than toluene slow toxicity than benzene, Can be used as a strong solvent instead of rosin.

4. Lipid solvents: low-carbon organic acid and alcohol conjugate, commonly used are butyl acetate, ethyl acetate, ethyl acetate, acetic acid, such as fat. Acetic acid, butadiene resin is less toxic, generally used in painting, easy construction, but also can prevent the precipitation of resin and nitrocellulose; Ethyl acetate dissolving power than butyl resin is good, often in the acetic acid butyl resin used in wood nitrocellulose lacquer; Fat slowly, used in fiber paint can improve dryness and whitening.

5. ketone solvent: it is an organic solvent, mainly used to dissolve nitrocellulose. Commonly used C, methyl ethyl ketone, methyl isopropyl ketone, cyclohexanone, methyl ketone and so on. Strong dissolution of acetone, the evaporation rate can be dissolved in any proportion of water, so easy to dry paint leaving the paint dry, crust. Generally combined with slow evaporation of the solvent. Most used in painting, fast-drying adhesive. Methyl ethyl ketone than acetone slow evaporation, poor dissolution of the tip, can be used alone; methyl isopropyl acetone high dissolving power, moderate volatile, to prevent the film whitening ability is very strong; Cyclohexanone (ketone ketone), acetone is easy to burn, Volatile slow, good solubility, can make the paint film in the drying to form a smooth and smooth surface, to prevent the generation of air bubbles.

6. Alcohol solvent: It is an organic solvent, mixed with water, commonly used ethanol, butanol and so on. Alcohol solvents on the paint dissolution is poor, can only dissolve shellac or butyral resin. When used with lipids, ketone solvents used in conjunction with, can increase its solubility, so called nitrocellulose lacquer. Ethanol can not dissolve the general resin, and can dissolve ethyl fiber, shellac and so on. Can also be used to produce alcohol varnish, wood stains, washing primer. Butanol slightly lower than the solubility of ethanol, volatile slowly, similar to the nature of ethanol. Commonly used with ethanol, to prevent the film white, eliminate pinholes, orange peel, bubbles and other defects. The special effect of butanol is to prevent the gelatinization of the paint, reduce the viscosity at the same time can also be used as amino resin solvent.

7. Other solvents: commonly used with chlorinated solvents, nitrifying alkane solvents, ether alcohol solvent. Chlorinated solvents dissolve very strong, but toxic, but in some special sum paint remover used; nitrane solvent evaporation rate and butyl acetate is about the same, while the solvent can be hungry nitrocellulose; ether alcohols Solvent is a new solvent, ether glycol, methyl ether glycol and its lipid and so on. Commonly used in cotton paint, phenolic resin paint and epoxy paint.

Keywords: tackifer resin, water based resin, maleic resin

How Many Types Of Water Based Resin?

Water based resin includes water based acrylic resin, water based alkyd and epoxy ester resin, water based saturated polyester resin, water based epoxy resin, water based polyurethane resin and the so on.

Water based acrylic resin: This type of water based resin has the largest production outlet, the is most widely used. It can be polymerized with emulsion: the use of emulsifier emulsification, polymer polymerization initiated in the water based emulsion, mainly used in interior and exterior wall paint, wood paint, plastic paint and other industrial anti-corrosion paint and topcoats, such as coil coating. Application features: good anti-sagging, fast drying, shine, poor fullness, construction is easy to produce bubbles.

Water alkyd and epoxy ester resin: a self-dry system, water anti-corrosion coating has been widely used, such as automotive chassis, steel structure and other industries have been quite mature.

Features: Compared with the solvent slow drying, due to the neutralization of the role of the polymerization of cross-linking oxidation is not very effective. At present, many self-drying alkyd and epoxy ester applications are baking at 80-100 ℃. This kind of resin is used for baking paint, which can make up the deficiency of self-dry cross-linking. It can be used in all kinds of metal protection and decoration. Features: Because of such systems contain oil molecules, the wetting of the paint is good, the film has excellent luster and fullness, cost at the end.

Water saturated polyester resin: This kind of resin is also through the salt-forming mechanism of water, used in high-grade amino paint and coil coating.

Features: This resin has excellent film hardness and processing performance, excellent weather resistance and corrosion resistance, these products are now in volume production, in the amino paint (electrostatic spraying) and coil coatings are applied.

Water epoxy resin: There are three water way: plus emulsifier, the use of amine curing agent emulsion epoxy resin, epoxy molecules in the introduction of hydrophilic groups. Such resins abroad a few years ago in the domestic promotion, but in the drying time and the final performance there is a gap. In recent years there are several domestic professional production of water epoxy business, in the two-component epoxy anti-corrosion coating application has a considerable scale.

What Type Of Solvent To Be Used For Maleic Resin?

Maleic resin is a type of modified rosin that made by maleic anhydride, and then with the esterification of polyols from, maleic resin dissolved in benzene, esters and ketones and other solvents, insoluble in alcohol solvents, some soluble in petroleum Solvent, good compatibility with vegetable oil; This product has low light color, not yellowing, good thermal stability and adhesion, etc .; can improve the film gloss, hardness, fullness, abrasion resistance and has Quick-drying.

Preparation Of Terpene Phenolic Resin

Under the action of acid catalyst, the phenol and formaldehyde are condensed by heating and then alkylated with terpene. The reaction temperature is 95-210 ℃. When the reaction temperature of 160 ~ 210 ° C, adding the appropriate amount of bleaching agent. And the low-boiling components are distilled off. The terpene phenolic resin produced by this method has the advantages of light color, high softening point and good oil solubility. Can replace the expensive tert-butyl phenolic resin and can be applied to paint, ink, cable, printing, rubber, plastics, adhesives and other industries.

How To Make Glyceryl Rosinate?

Glyceryl Rosinate is the important material for adhesive and food additive. When producing, crushed the rosin into small pieces and add it to the reactor, start heating, glycerol ester and zinc oxide all the time to join the reactor. If the rosin is not melted, stop the stirring. If it melts, continue to stir and continue to warm up to 270°C in 30 minutes, and then in 2h slowly to 290 & lt; 0 & gt; C. 1h before this phase is for the esterification reaction stage, 1h after the reaction gradually slowed down, when reaching 290 ℃, continue to heat up, while opening the valve to steam the excess water and glycerol, volatile matter. And then 0.5h rise to 305 ℃, sampling inspection, acid value below 20, the softening point above 80 ℃, light color and transparent glyceryl rosinate are required.

Compatibility of Tackifier Resin with Acrylate Pressure Sensitive Adhesive

The most important properties of pressure-sensitive adhesive is the initial viscosity, adhesion and holding force, they are not only related to the deformation of pressure-sensitive adhesive materials, but also with the degree of damage to the material is closely related. An acrylic pressure-sensitive adhesive containing a Tackifier Resin is a blend of long chain molecules with small molecule or oligomer molecules. Since compatibility determines the phase structure, it is important to examine the compatibility of the components. If the two are completely compatible, the system is a uniform single phase structure. When the tackifier resin content is low, the physical properties of the material mainly show the characteristics of acrylic copolymer, Tackifier Resin from the role of plasticizers, reducing the viscosity of the whole system, with the increase in Tackifier Resin content, viscosity When the Tackifier Resin content reaches a certain value, the adhesive force reaches the maximum value. At this time, the viscosity of the system is the smallest, and beyond this value, the physical properties of the material are greatly affected by the Tackifier Resin, The cohesive energy decreases, the adhesive force also drops rapidly. If the compatibility of the two is very small or completely incompatible, the phase separation occurs from a low concentration, the Tackifier Resin acts only as a filler, reducing its original pressure-sensitivity.

Generally speaking, the solubility parameter (SP value) similar to the material compatibility is good, this also applies to Tackifier Resin and polymer compatibility relationship between. C5 series of petroleum resin, terpene resin, C5 / C9 series of petroleum resin, C9 series of petroleum resin, rosin series of resin. Studies have shown that [4 ~ 6], petroleum resin, terpene resin and acrylic polymer compatibility is poor, the more the amount of pressure-sensitive properties of the worse; rosin resin, hydrogenated rosin ester and acrylic polymerization Material has a certain compatibility, fast sticking strength and peel strength has increased.

The measurement of the compatibility of the blend can be based on Tg as a criterion. The incompatible blends have two Tg peaks, corresponding to different components. At the onset of two Tg peaks, the Tg of the copolymer increases with the increase of the content of the resin. Position, indicating the separation of the phases.

The degree of compatibility of the blend can be determined by measuring the glass transition temperature Tg of the blend by DSC. The compatibilized blend has a wider glass transition temperature than the tackifier-free acrylate pressure-sensitive adhesive, which is the weight average of the transition temperatures of the components. The Fex equation approximates the Tg of the compatibilized blend: 1 / Tg = w1 / Tg1 + w2 / Tg2 where Tg is the glass transition temperature of the compatibilized blend and w1, Tg1, w2, Tg2 are the polyacrylic acid The glass transition temperature and the weight fraction of the ester and Tackifier Resins. The degree of compatibility of the blends can be evaluated by means of the deviation between the measured values ??and the calculated values.

With the transparency of the film can also be a rough judgment of the compatibility of blends [5 ~ 6]. When the Tackifier Resin is fully compatible with the polyacrylate, the film is transparent; as the compatibility changes from good to bad, the film becomes transparent from opacity to opacity. This is because when the two phases are separated, the Tackifier Resin will be dispersed in the form of discontinuous micro-regions, which differ from the refractive index of the polymer and result in the opacity of the film. But this method can not determine the degree of incompatibility.

What Type Of Water Based Emulsion is Suitable for You?

On the market, there are many types of water based emulsions you can find out, but which one is better for your application? you need to be clear of the points as follow:

1. What type of ink will you be using?

2. What environment will you be washing out your water based emulsion?
3. What experience level do You have with printing process? Are you a beginning user, intermediate or pro?
4. What type of exposure unit do you have?

All the questions above will help you save time and money in the long run. Once you have these answers, you can look at the pros and cons of each kind of emulsion and compare them to your resources and experience.