Note the important point kneaded fluororubber

Xinhua Xu + rubber fluorine rubber formulations, the actual relatively simple, with fluorocarbon rubber is widely used as an example, in addition to its compatibility nothing more than raw fluoro rubber, acid scavengers [magnesium oxide, calcium hydroxide], dispersion flow agent [Brazil wax, a 280 the WS et] a reinforcing filler [diatomaceous earth, barium sulfate, N774, N990, etc.], toner with a small amount of heat, such as the use of phenolic curatives, bisphenol AF with places to BPP .

A synthetic polymer elastomer synthetic rubber series, fluorine rubber as the main or side chains of carbon atoms containing fluorine atoms, has excellent high temperature, cold, [has now developed resistance to more than 40 degrees below zero cold containing Di ether monomers fluorine rubber, fluorine rubber Xinhua Xu rubber more resistant to radiation, oil resistance, solvent resistance, corrosion resistance, chemical resistance, resistance to strong oxidant properties, and good physical properties, and good electrical insulation properties, with its processing products, available in the other rubber can not afford to harsh environments. Is widely used in modern industry, agriculture, national defense, high-tech industry, transportation, aerospace, as well as people's lives using the product.

Some of China's medium and small, micro rubber enterprises, should market demand orders, fluorine rubber products and gradually develop the project. But in the process, often not too small to understand the special nature of fluorine plastic processing, to no avail, but inadvertently result in scrapping the whole batch, you know fluoro rubber prices are more than one hundred yuan per kilogram and the cost of thousands of dollars glue, a broken plastic car to pay a high price.

Xu Xinhua Rubber Products Why fluoro rubber compound after the park to re-use re-refined back?

We know that Xu Xinhua rubber products fluorine rubber after kneading, various additives which are not further dispersed uniformly in the rubber compound, while the rubber mixing macromolecular chains by mechanical shear force, tear force, friction and other not completely eliminated. If at this park without immediately put to use, it is not hard to predict the result. Vulcanized products, size is difficult to ensure a large shrinkage, poor product surface gloss, very rough. Pass rate, poor product properties and performance, service life is short. Therefore, the fluorine rubber be put into use after mixing rubber compound must be parked two hours.

Recently, some among peers, received considerable fluorine rubber product orders, technical staff and also scripted batch teacher pay, according to the book presentation to do, can be refined out of the gum, there is a problem in the vulcanization process, crisp edges, missing plastic, easy to break. And refining the glue inside a lot of white spots, or even scrapped vehicle gel. Delivery is imminent, read "plastic feeling" of Italy, the best "glue friendship" Responsibility, had "surgeon attend" live demonstrations. Every fluorine rubber refining division to pay, you must understand: it is necessary to "worship fluoro", it is necessary to under-resistant heart, thoroughly clean from the tailgate machine, roller, tray, ingredients, places or thoroughly clean start and does not allow any slack, especially without a dedicated machine, and other common types of plastic kneading machine, even more important.

Since fluorine rubber belong special synthetic rubber, its excellent special properties, it determines its "Pride and Prejudice", mixing workers are not well served, it is not buy it. Viton, by definition, to be "Buddha" to take care of in order to "repair was immortal." Mold must chrome plating to be thicker.

Recipe Xinhua Xu rubber products fluorine rubber, actually relatively simple, with fluorocarbon rubber is widely used as an example, in addition to its compatibility nothing more than raw fluoro rubber, acid scavengers [magnesium oxide, calcium hydroxide], dispersing agent flow [Brazil wax, a 280 the WS et] a reinforcing filler [diatomaceous earth, barium sulfate, N774, N990, etc.], toner with a small amount of heat, such as the use of phenolic curatives, bisphenol AF with places to BPP.

Xinhua Xu rubber products fluorine rubber compound to be parked Why?

First, during mixing, mixing rubber macromolecular chains by mechanical shearing force, tear force, friction, etc. to remove the rubber macromolecular chains in a relatively stable state, preventing large deformation after vulcanization, large shrinkage ;

Second, make all kinds of additives in the rubber further dispersed uniformly, and further penetrate into the rubber chain to Oita, adsorption occurs and rubber macromolecular chains, affinity, occluded form more gel (inclusive rubber), improve the reinforcing effect of the rubber;

Third, make the rough mix becomes stiff flexibility, mobility, reduce shrinkage and appearance of the finished product defects;

Fourth, the use of mix parked, you can quickly check the properties to see whether the mix to achieve the desired physical properties of the indicator. As some indicators of failure (such as plasticity, hardness, etc.), you can supplement the kneading, kneading to prevent unnecessary loss of direct investment in the production process caused.

After the park before using the mix are generally required to be returned to refining. There are smelting and refining fine, fluorine rubber mix and mix with the general difference is:

Purpose and back mixing are:

So that various additives in the rubber compound further dispersed evenly;

Denaturing gel can destroy the park has formed in the mix, so that rubber becomes soft, easy molding operation;

Improve rubber fluidity and self-adhesive (due to poor adhesion of fluorine rubber, prone to heavy leather, cracking, lack of glue, rounded appearance and other quality problems), to facilitate the molding process and operating process;

You can improve the appearance and quality of the passing rate of finished products.

Xinhua Xu rubber fluorine rubber mixing quality is good or bad, depends crucially on the patient and meticulous operation process. Most of the problem is due to paid piecework, while operating in a hurry and rough walls.

Xinhua Xu rubber when kneading, according to personal experience, the best ingredients divided into three parts (ie, acid acceptor part, part of the reinforcing filler, a vulcanization accelerator part), in the order and time points times are slowly added. As dispersant and flow agent such as Brazil wax, WS-280, etc., preferably by an amount divided into three equal parts, each part of the mixed acid scavengers, part of reinforcing fillers, fillers and vulcanization part for the benefit of all powder can be uniformly dispersed. Xu Xinhua Rubber Products [quality ingredients, absolutely can not buy knockoff, especially acid scavengers magnesium oxide must be highly active, with agents and other raw fluoro rubber should be stored dry train]. Roll cooling water must be open enough, to secure the roll temperature at 50 degrees up and down. When students pass the thin fluorine, roll gap of 2 mm, package roll is a good time to control up and down in four minutes. In the three sessions plus powder process, to thin along the upper nip slowly added evenly, avoid dumping it. To control the roll gap of about four millimeters, acid scavengers part kneading time four to five minutes, a filler is added to be patient, mixed with thirteen minutes left in the control, in order to eat as the standard, it does not eat into the powder, adjustable Great point roll pitch, so eat into powder. Be a smooth rubber roller bag after careful even added Zi three parts vulcanization accelerator and the bisphenol AF BPP, patience to see it eats into the time about six minutes, Xu Xinhua Rubber Products [more operational, not greedy convenient cutter, Remember. ] Final adjustment of the roller spacing to three millimeters thin pass, hit triangle bag five times, and then loosen the roller from five millimeters, about the cutter, even after refining turn, to film, the total mixing time should not be less than 30 minutes. Routine inspection, cleaning areas that are isolated rubber set put Ding, Ding put at least 24 hours later, it is best to put Ding after two days spent two weeks in order to return by refining used up. (Where a cross-sectional cut fluorine rubber, white spots found, in addition to ingredients factors, mainly the non-uniform mixing) and mixing by repeated operatives frank communication, refining fluorine rubber pecker up, wait patiently, "Lord fluorine "this demonstration, though backache, leg pain, tired but good value, at least for the open this small plant" wait-fluoro "the door to service gum friends, create value. Important: After fluorine rubber mix out, do not use water immersion cooling to prevent the rubber compound of the aid (plus 3 # crosslinking agent, BBP) is withdrawn, or moisture (such as Ca (OH) 2MgO), impact products inherent quality and appearance (bubble), can be cooled chiller hair.

Xinhua Xu rubber fluorine rubber mix back to the park after mixing approach is:

Usually the first fluorine rubber sheet mix in large rolls from the room by 1-2 times, and then through a thin (roll gap 1 ~ 2mm) three times. Then amplified roll gap (3 ~ 4mm), back mixing evenly (about 4 times each cutter), can be a film, pay attention to time not too long, to prevent a long time, a roll temperature rise, sticky roller phenomenon.

Under general films according to actual needs, adjust the roll from the film. After the film, not water-cooled, direct use of polypropylene film winding isolation standby. Otherwise, fluorine rubber mix easily absorb moisture, so the product bubbles, delamination, cracking, lack of plastic and other quality problems.

This is not redundant, but the manufacturing quality is the only way, saying about: making fine carved fine, fine not only need to fine people, but also sophisticated technology procedures. Two are indispensable. Product should be carefully designed, well construction, careful operation, to a fine.