Description of the white latex formulation process

China Coatings Online News Information
Product Features and Uses
This product is a water-soluble adhesive, a thermoplastic adhesive produced by the polymerization reaction of ethylene acetate monosome under the action of a trigger. Commonly referred to as white latex or PVAC emulsion, the chemical name polyvinyl acetate adhesive, is composed of acetic acid and ethylene synthetic ethylene acetate, added titanium dioxide powder (low-grade on light calcium, talcum powder, etc. powder). White latex can cure at room temperature, cure faster, bonding strength is high, bonding layer has better toughness and durability and is not easy to age. Can be widely used in bonding paper products (wallpaper), can also be used as waterproof coatings and wood adhesive. Wood material bonding. It is water as a dispersant, the use of safe, non-toxic, non-combustible, easy to clean, temperature curing, wood, paper and fabric has a good adhesion, high bonding strength, cured glue layer colorless transparent, good toughness, not contaminated by adhesive; Therefore, widely used in printing binding and furniture manufacturing, used as paper, wood, cloth, leather, ceramics and other adhesives, but also for phenolic resin, phenolic resin and other adhesive modifiers, used in the manufacture of polyvinyl acetate latex paint.
the disadvantages of ethylene poly acetate emulsion mucus is poor water resistance and moisture resistance, easy to absorb moisture in humid air, use at high temperatures will produce creep phenomenon, so that the strength of the glue is reduced; This product to polyethylene alcohol and formaldehyde polymerization of polymer compounds as a modifier, so that the water resistance and antifreeze properties of emulsion improved, expanding the application of emulsion.
process
1, polyethylene alcohol powder in the ionized water melt completely, filtration. (Optional PVA-1788 2488, etc.)
2, polyethylene alcohol glue into the stainless steel reactor (can also be used enamel reactor, but the heat transfer effect of the enamel kettle is not as good as the stainless steel reactor), and then add emulsifying agent OP-10, start the mixer, so that it mixes evenly.
3. Add 15% (i.e. 6.9) of the total amount of polyethylene acetate monomer and 40% (i.e. 0.036) of the potassium persulphate formulation to the stainless steel reactor, continue stirring, and begin to heat up. Stop heating when the temperature rises to 60-65 degrees C. It should be noted that the trigger potassium per sulfate should first be converted with pure water into 8% to 10% of the aqueous solution, divided into multiple additions.
4, under the role of the trigger, although the heating is stopped, but the temperature rises on its own, when the temperature is above 65 degrees C, the reflow device of the reactor begins to reflow. The reflow gradually decreases as the temperature rises above 80 degrees C. At this time, from the reactor's drop-plus, polyvinyl acetate monomer drip-plus, drop acceleration should be controlled at about 10% of the total amount of drip-plus per hour (i.e. about 4.6). In the reaction process, we should pay close attention to the reaction temperature, add cooling water to the reactor jacket to control the reaction temperature, not higher than 80 degrees C.
5, in addition to ethylene acetate monosome, but also added a trigger, the amount added per hour is about 4.5% of the formula.
6, ethylene acetate and triggers should be controlled at about 8h. Due to the role of the trigger, the reaction is more intense, after the addition of the monogam, the reaction temperature will rise on its own, when it rises to about 93 degrees C, insulation 30min. The aggregation reaction is basically complete.
7, open the cooling water, so that the temperature in the stainless steel reactor is reduced to less than 50 degrees C, add sodium bicarbonate water solution (should be pre-melted 10% concentration) and phthalates, pH to 6 to 7 so far.
8, stainless steel reactor mixer can not stop, when cooled to room temperature, white latex finished products, stop stirring, discharge, packaging.
9, when the white latex finished product of the sticky over a large, poor water resistance, can be appropriately reduced the amount of polyethylene alcohol in the formula.
10, if the stability of white latex latex is poor, can appropriately reduce the amount of some triggers in the formula, too little time will not trigger, resulting in monosome difficult to polymerization.
11, phthalates dosing should not be too much, do not exceed 10% of the monosome, otherwise the adhesive of white latex finished products decreased, and increased costs. Its main function is to increase the toughness of the emulsion and reduce the film temperature of the emulsion.
12, if the white latex finished product foam more, can be added to the appropriate amount of defrosting agent.
13, the amount of potassium per sulfate and add time should be carefully mastered, when the beginning of the return flow, if the return flow is large, indicating that the trigger agent did not play a role, too much monosome, should stop adding monosome, can be appropriate to increase some triggers, when the return flow is normal and then add monosome.
14, with the above-mentioned white latex formula and production methods produced by the white latex for the white uniform milky liquid, solid content of about 50%, pH of about 5.
In addition, this white latex finished product can also add 801 glue, sharp titanium-type titanium dioxide production modified white latex
use method
the use of the same method as the traditional ethylene polya acetate latex use method, the product is resistant to freezing and melting, anti-aging, good bonding strength, storage period of
5, in addition to the ethylene acetate monomer, but also added a trigger, the amount added per hour is about 4.5% of the formula.
6, ethylene acetate and triggers should be controlled at about 8h. Due to the role of the trigger, the reaction is more intense, after the addition of the monogam, the reaction temperature will rise on its own, when it rises to about 93 degrees C, insulation 30min. The aggregation reaction is basically complete.
7, open the cooling water, so that the temperature in the stainless steel reactor is reduced to less than 50 degrees C, add sodium bicarbonate water solution (should be pre-melted 10% concentration) and phthalates, pH to 6 to 7 so far.
8, stainless steel reactor mixer can not stop, when cooled to room temperature, white latex finished products, stop stirring, discharge, packaging.
9, when the white latex finished product of the sticky over a large, poor water resistance, can be appropriately reduced the amount of polyethylene alcohol in the formula.
10, if the stability of white latex latex is poor, can appropriately reduce the amount of some triggers in the formula, too little time will not trigger, resulting in monosome difficult to polymerization.
11, phthalates dosing should not be too much, do not exceed 10% of the monosome, otherwise the adhesive of white latex finished products decreased, and increased costs. Its main function is to increase the toughness of the emulsion and reduce the film temperature of the emulsion.
12, if the white latex finished foam more, can be added to the appropriate amount of defrosting agent.
13, the amount of potassium per sulfate trigger and add time should be carefully mastered, when the beginning of the return flow, if the return flow is large, indicating that the trigger agent did not play a role, too much monosome, should stop adding monosomes, may be appropriate to increase some triggers, when the return flow is normal and then add monotons.
14, with the above-mentioned white latex formula and production methods produced by the white latex for the white uniform milky liquid, solid content of about 50%, pH of about 5.
addition, this white latex finished product can also add 801 glue, sharp titanium-type titanium dioxide production modified white latex
Aging, good bonding strength, storage period of long white latex formula
1, white latex raw materials
1, vinyl acetate: a.k.a. vinyl acetate, ethylene acetate, colorless flammable liquid. Has a strong fragrance. Its vapor is irritating to the eye. Insoluble in water, soluble in most organic solvents. For making vinyl esters and synthetic fibers. It is also used in rubber making, paint, adhesive, etc. Used as an adhesive in this agent.
2, polyethylene alcohol: a polymer compound made of polyvinyl acetate by soap. White or milky yellow powder. Thermoplastic. Depending on the degree of saponification, the product is soluble in water or can only be swollen. It is mainly used as raw material for polyethylene alcohol acetaldehyde resin, and also as adhesive, dispersant, etc. Used as an adhesive in this agent. Choose industrial products.
3, phthalates: colorless liquid. Insoluble in water, soluble in ethanol, ether and other organic solvents. It is a plasticizer when making plastic, synthetic rubber, artificial leather, etc. It is also a solvent and curing agent for fragrances. Used as a plasticizer in this agent. Choose industrial products.
4, cinol: cinol has positive alcohol and a variety of isomer. This refers to 2-ethyl hethiol-1. Colorless liquid with a special odor. Dissolved in water and organic solvents such as ethanol and ether. Used as a solvent in this agent. Choose industrial products.
5, ammonium persulphate: colorless mono-oblique crystals. Sometimes slightly light green, soluble in water. Heat is decomposed and has strong oxidation. Used as bleach, oxidant, deodorant, etc. Used as a polymerizer in this agent. Choose industrial products.
II, white latex formula (weight)
ethylene acetate to 45
polyethylene alcohol to 5
phthalates to 4
inol to 1
Ammonium sulfate to 0.1
water to 44.9
3, white latex production method
1, according to the formula amount of phthalates and xenol mixed, stirring to dissolve it.
, add water to the container, heat to 70 degrees C, add polyethylene alcohol under stirring, heat up to 90 degrees C, insulation until all dissolved. After dissolving, stop heating to bring the temperature down to 66 to 69 degrees C, and add ethylene acetate under stirring.
3, the (1) step of the solution into the (2) step of the solution, and finally added ammonium sulfate, mixing and mixing well, at 66 to 69 degrees C for emulsion polymerization, that is, white latex.
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