plastic flame retardant Flame retardants Overview
Most plastics are flammable. With the plastic in the construction, furniture,
transportation, aviation, aerospace, electrical and other aspects of the widely used to
improve the flame retardancy of plastics has become a very urgent issue. Burning flame
retardant to inhibit a class of polymer additives, they are mostly
Of the Periodic Table Ⅴ, Ⅶ Ⅲ group elements and compounds; especially phosphorus,
bromine, chlorine, antimony and aluminum compounds. Sub-additive flame retardants and
reactive types. Flame retardant halogen-containing primarily phosp hate and phosphate, a
halogenated hydrocarbon, antimony oxide, aluminum hydroxide
And so on. Advantage is easy to use and adaptable. However, the addition of capacity of 10%
to 30%, often affect the performance of plastics. Reactive flame retardant containing the
elements actually monomer, it has little effect on the plastic properties. Common reactive
flame retardant, eg for poly-
Halogenated ester anhydrides, for epoxy resins of tetrabromobisphenol A, and phosphorus for
polyurethane polyol. Initially flame retardants used in the U.S., after the 1960s, the
amount of surge current usage after plasticizer. Consumption of flame retardants in PVC
plastic varieties most
, Polystyrene, polyurethane foam, unsaturated polyester, ABS resin and polypropylene.
Most plastic is flammable, its products, which brought a lot of application security risks.
Pr ecisely, flame retardants, flame retardants known as more appropriate, because "flame"
contains two meanings flame retardant and smoke suppression, compared with the broader
concept of flame retardants. However, long-
Period, people have become accustomed to the concept of use of flame retardants, so the
current literature is actually referred to flame retardant and smoke suppression effect
functional additives in general.
Classification of flame retardants
Flame retardants can be classified according to their use additive flame retardant and
reactive flame retardant. Flame retardant additives usually added to the manner in
conjunction with the base resin, and the resin between them just a simple physical mixture;
reactive flame retardant resistance generally contained within the molecule
Fuel elements and the reactive group-containing monomer, such a s a halogenated anhydrides,
halogenated bisphenol-and phosphorus-containing polyols and the like, because of its
reactivity, can be chemically bonded to the molecular chain of the resin, a plastic resin
part, most reactions flame retardant barrier structure or synthetic additive
Flame retardant monomers. Chemical composition according to the different flame retardants
can be divided into inorganic and organic flame retardants. Inorganic flame retardants
include aluminum hydroxide, magnesium hydroxide, antimony oxide, zinc borate, and red
phosphorus, etc., halogenated organic flame mostly organic bromide, an organic
Chlorides, phosphates, halogenated phosphate, nitrogen and phosphorus flame retardant
intumescent flame retardants. Smoke suppressant effect is to reduce the amount of flame-
retardant materials and toxic smoke emission of harmful gases, mostly for molybdenum
compounds, tin compounds and iron-based compounds. Despite
Antimony trioxide and zinc borate also smoke suppression, but is often used as a flame
retardant synergist and therefore classified as a flame retardant system.
Flame retardant properties of the vast majority of a hard plastic indicator, conventional
flame retardant is used in halogen-containing flame retardant. Combustion of halogenated
flame retardant materials produce a lot of smoke and toxic corrosive gases will cause
secondary damage. Common ingredients are flame retardant phosphorus compound formula
, Silicone-based flame retardants, nitrogen-based flame retardants and metal hydroxides,
etc. Volatile combustion does not produce corrosive gases, pollution-free flame retardants
are known. Flame retardant is added to phase in the material suitable halogen flame
retardant to achieve the purpose, while avoiding contain halogens with
To secondary hazards. plastic processing aid
As people s environmental awareness, aluminum hydroxide as having low smoke, non-toxic, good thermal stability, non-corrosive gases, low prices, etc., and flame-retardant effect is good, rich source, in the domestic market with its consumption accounted for more than 80% inorganic flame retardants, stearic acid
Accounting for over 50% of the total flame retardant, so aluminum hydroxide is a flame retardant broad application prospect. Aluminum hydroxide as an inorganic filler and an organic polymer in the physical form and chemical structure is very different, the affinity difference between the two, if the direct filling will cause dispersion of
Average, and those who will become the size of a large composite stress concentration points, as material weaknesses. These not only limits the added filler in the polymer amount, but also seriously affect the product performance. In order to improve aluminum hydroxide and polymer exclusion knot strength
And interface compatibility, the use of surface modifiers modified aluminium hydroxide is the most effective way. In present the evaluation of the effect of a flame retardant modification mostly to evaluate the final result according to the application, such as measuring the impact strength of the final composite, the tensile strength
, Hardness and other parameters to comprehensive characterization, evaluation reliable and intuitive, but the process route and process complex, long cycle.
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shut off solenoid valve - China Manufacturer
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In the petroleum, chemical, metallurgical and energy industries, the valve is one of the widely used fluid control equipment.
high temperature solenoid valve As an important part of the piping system, a lot of specifications and types of valves, the role of different. Some used to connect or cut off media, adjust the media pressure or flow, to prevent the medium pressure exceeds a predetermined value, and to ensure the safe operation of the pipeline or equipment. Some to separation, mixing or distribution medium, to ensure that the system process conditions. Due to the role of the valve in the piping system, will directly affect the manufacturing process of the valve to the safe operation of the pipeline equipment. Therefore, the "pressure piping components manufacturing security registration and management approach", the manufacturing unit of the valve should accept the security registration, only the valve the Security Registration manufacturing unit production can be used for pressure pipe.electric solenoid valve
May look at me with contempt, may find the seat belt is a cumbersome, the department was uncomfortable, but this idea is really the "naive." We only have one, you should not put their own lives on their faith in good luck.seat belt adjuster
Current domestic traffic enforcement increasingly stringent, it is because more and more road traffic accidents are becoming a major social problems. Whether drunk driving or not wearing a seatbelt fine, or is to prohibit drivers from driving a cell phone, is the spirit of respect for human life as a starting point, do you have any reason to put themselves and the lives of others at the expense?
Develop a good driving habits are responsible for their own. In many countr ies, as long as the motor vehicle passengers must wear seat belts are, even if the back seat is the same, or do you really think that every seat belts are designed only for cars by checking it do?
Remind driving friends "not wearing a seatbelt a traffic accident mortality will increase fivefold, only one life, do not take their own lives and safety joke." Taobao search this "belt T-shirt", selling businesses is not much, but there are indeed recommended Taobao such products directly to the shelf when the contraband. Driving should major in school to strengthen education and training of qualified drivers.car safety seat belt
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concrete drop in anchors - China Manufacturer
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Through the material
Nylon screws, PC screws, PVDF screw, PP screw
Depending on the screw head
In accordance with the shape of the head can be divide d into: pan head plastic screws, countersunk head screws plastic, hexagonal plastic screws, hexagonal plastic screws, plastic, set screws, etc.
Slotted shape can be divided into: Phillips, slotted (slotted), hexagon, m word, plum, etc.
By Thread Size
Metric thread M2, M2.5, M3, M4, M5, M6, M8, M10, M12
According to the above categories can combine different types of plastic screws specific
Main physical performance indicators:high power dummy load
A screw knot twist
2 cruciform recess, especially the head meets the standard screwdriver head size.
3 plastic thread diameter, diameter, bottom diameter size standardization. Since the use of different plastic case lead to different absorption difference in size, this standard is not strictly a metal screw.
The main chemical performance indicators
3, fire rating
4 Insulationatx power supply load tester
So, how do we properly wear seat belts? China Automotive Technology and Research Center crash simulation laboratory director Zhang Xiaolong introduction, the proper use of seat belts can be divided into the following steps:fall protection equipment
First, we must adjust the sitting position. Ready, Stretch your hands, wrists just so hands on the steering wheel 9:00 and 3:00 nearly horizontal position, so that we can be effective in case of an emergency control of a vehicle; addition, the offer legs bent at 90 degrees, when the event of a crash, can ensure a sufficient buffer legs, hips and upper body to avoid injury.
Secondly, wear your seat belt. Slowly pull the shoulder belt to the waist, making it clos e to the body at the same time, try to ensure that straps across the chest, preferably over the shoulder 5 to 10cm, and close to the neck, while the waist is as below the abdomen. "Lower sub motorists need to put on a fixed point as low as possible, so as not reined in the neck, causing injury," Zhang Xiaolong special reminds us. Need extra attention, in our seat belt buckle into the lock button clicks, you should look at pulling the seat belt has been fastened to ensure that the belt buckle and undamaged.seat belt adjuster
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electric solenoid valve - China Manufacturer
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The electric actuator is a kind of electric actuator as an energy source, according to the structure can be divided into the electric control valves, solenoid valves, pumps and electric motor speed regulator and accessorie s.3 way air valve
Electric control valve is the most common electric actuator, which by an electric actuator or a hydraulic actuator and a power adjustment means (control valve) components. Electric or electro-hydraulic actuator actuator controller output signal is converted linear displacement control valve or control valve shaft angular displacement. As part of their regulatory bodies, through single seat valve, double seat valves, angle valves, butterfly valves, ball valves, and so on.
Solenoid valve is a magnet of the electric power control unit for the two electrical actuators. Motor speed pump, by varying the speed of the pump motor, adjusting the flow rate of the pump electric actuator, usually with frequency converter supply to the changed frequency motor, the motor speed control of the input signal changes. With the throttle control valve for regulating the flow method, which has the advantages of energy saving, thus gradually applied. Electric power adjusting element and the electrical actuator control, such as the common induction regulator, thyristor regulator, etc., · By changing the current flowing through the load or the voltage applied to the load change in the load power control purposes. For example, a thyristor voltage regulator to control the heater, the temperature of the heater temperature is needed to meet the requirements.
(1) The electric actuator electric actuator motor and reduction gear for moving the valve actuator. Typically, the actuator input signal is a standard current or voltage signal, the output signal of the motor, reverse or stop the three switching signals. Electric actuators act quickly, fast response, the use of power access convenient, transmission distance and other characteristics.
The displacement of the actuator can be divided into straight trip, rotating multi-ring and other categories, according to the input sig nal and the output proportional, integral, and other types of relationships.stainless steel pneumatic cylinders