Blowing agent Foaming agent โบลวิ่งเอเจ้น ยาพอง

Blowing agent, โบลวิ่งเอเจ้น, ยาพอง, สารช่วยฟู

ยาพองหรือสารฟู

(BLOWING AGENT), เป็นสารที่เติมลงในโพลิเมอร์เพื่อให้สลายตัวเกิดเป็นฟองก๊าซแทรกอยู่ในเนื้อโพลิเมอร์

เมื่อได้รับความร้อน ณ อุณหภูมิใดอุณหภูมิหนึ่ง แล้วแต่สารที่ใช้

ใช้ในการผลิตวัสดุประเภทโฟม ฉนวนกันความร้อน

รองเท้าฟองน้ำ ช่วยลดปริมาณการใช้โพลิเมอร์ ทำให้ผลิตภัณฑ์มีน้ำหนักเบา

Chemical blowing agents are

organic or inorganic additives used in the manufacture of polymeric foams. The

chemical blowing agents in our range are stable under moderate storage

conditions up to 20?C, but decompose at elevated temperatures during the processing of polymers to

generate gas which forms a foam structure in the polymer matrix. One of the

most efficient chemical blowing agents is azodicarbonamide.

The

outstanding features of polymeric foams are weight reduction, the lower amount

of polymer which has to be used, resulting in a more economical use of energy

and lower cost, and improved sound and heat insulation.

Azodicarbonamide,

or azobisformamide, is a chemical compound with the molecular formula C2H4O2N4.

It is a yellow to orange red, odorless, crystalline powder. As a food additive,

it is known by the E number E927

Azodicarbonamide

is used in the American food industry as a food additive, a flour bleaching agent

and improving agent. It reacts with moist flour as an oxidizing agent. The main

reaction product is biurea, a derivative of urea, which is stable during

baking. Secondary reaction products include semicarbazide and ethyl carbamate.

The United States permits the use of azodicarbonamide at levels up to 45 ppm.

In Australia[citation needed] and Europe 

the use of azodicarbonamide as a food additive is banned.

Other uses

The

principal use of azodicarbonamide is in the production of foamed plastics as an

additive. The thermal decomposition of azodicarbonamide results in the

evolution of nitrogen, carbon monoxide, carbon dioxide, and ammonia gases,

which are trapped in the polymer as bubbles to form a foamed article.

Azodicarbonamide

as used in plastics, synthetic leather and other uses can be pure or modified.

This is important because modification affects the reaction temperatures. Pure

azodicarbonamide generally reacts around 200 ?C, but there are some products

that the reaction temperature must be lower, depending on the application. In

the plastic, leather and other industries, modified azodicarbonamide (average

decomposition temperature 170 ?C) contains additives that accelerate the

reaction or react at lower temperatures.

Azodicarbonamide

as a blowing agent in plastics has been banned in Europe since August 2005 for

the manufacture of plastic articles that are intended to come into direct

contact with food.

Synonyms

1,1'-Azobisformamide; AC Blowing Agent; ADC;

C,C'-Azodi(formamide);

ADA; Azobiscarbonamide; Azobiscarboxamide; Azodicarbodiamide; Azodicarboxamide;

Azodiformamide; Azodicarbonamide; Diazenedicarboxamide; Diazenedicarbonic;

C,C'-Azodi(formamid) (German); C,C'-Azodi(formamida) (Spanish);

C,C'-Azodi(formamide) (French); Azobisformamide; 1,2-Diazenedicarboxamide;

Other RN.:  183256-78-2, 52737-71-0,

62494-62-6, 62494-61-5, 62494-85-3, 65098-86-4, 65098-87-5, 72514-45-5,

73247-42-4, 73905-77-8, 81774-20-1, 89073-35-8, 97707-96-5, 218433-14-8,

221272-72-6 

GENERAL DESCRIPTION:

Azo

is the prefix for the group -N=N- or a combining form of azote which share the

core azobenzene structure. Azo compounds have a general molecular formula of

R-N=N-R', where R is aryl, heteroaryl, -CH=C(OH)- or aliphatic. The extended

delocalization of electrons in the benzene and azo groups forms a conjugated

system absorbing visible frequencies of light. Aromatic groups provide

characteristic colors of red, orange, and yellow. This is the fundamental

structure of azo dyes. Aliphatic azo compounds are unstable and the loss of

nitrogen gas occurs by the simultaneous cleavage of carbon-nitrogen bonds,

resulting in carbon-centered radicals. some aliphatic azo compounds are

utilized as radical initiators. Azobisisobutyronitrile is a typical initiator

of free radical reactions for the production of polymer (polyvinyl chloride,

polyacrylonitrile, polyvinyl alcohol and synthetic fibers) and as a blowing

agent for plastics and elastomers.

Azodicarbonamide,

releasing nitrogen gas, is a general foaming agent for rubbers and plastics such

as PVC, EVA, polyolefin, polystyrene products. (Its temperature of

decomposition is 205 - 215 C). Food grade of Azodicarbonamide is used as a

flour aging and bleaching ingredient in cereal flours and dough conditioner in

baking bread. It reacts with moist flour as an oxidizing agent.

Azodicarbonamide acts as a hydrogen acceptor, converting to biurea. The United

States allows azodicarbonamide to be added to flour at levels up to 45 ppm. Use

of azodicarbonamide as a food additive is banned in Australia and in Europe.

The pharma grade of Azodicarbonamide molecule is used as an Anti-HIV agent,

Anti-Infective Agent, Anti-Retroviral Agent, Antiviral Agent, Immunologic

Factor, Immunosuppressive Agent.

DESCRIPTION OF BLOWING AGENT

Blowing

agents, also called foaming agents, can be classified as Physical and Chemical

Blowing Agents. Physical blowing agents are not under chemical changes during

processing. Physical blowing agents are in forms of liquid or compressed gas

which will transfer state into gases or low boiling liquid during processing

causing resins into cellular structure. Chemical Blowing Agents are mainly

solid form of hydrazine derivatives include Azodicarbonamide;

p,p'-Oxybis(benzenesulfonyl hydrazide); 5-Phenyltetrazole; p-Toluene sulfonyl

semicarbazide; Trihydrazine Triazine; They commonly release gases such as

nitrogen, carbon dioxide, carbon monoxide or ammonia. But ammonia is not

desirable as it effects on degrade of resins. There are nonazo blowing agents

releasing carbon dioxide such as sodium borohydride.

Safety

In

the United States, azodicarbonamide has generally recognized as safe (GRAS)

status and is allowed to be added to flour at levels up to 45 ppm.

In

the UK, the Health and Safety Executive has identified azodicarbonamide as a

respiratory sensitizer (a possible cause of asthma) and determined that

products should be labeled with "May cause sensitisation by inhalation.

Toxicological

studies of the reactions of azodicarbonamide show that it is rapidly converted

in dough to biurea, which is a stable compound not decomposed upon cooking

Product Description

ADC Foaming Agent

Azodicarbonamide / AC Blowing Agent

CAS No: 123-77-3

H. S. Code: 2927000090

Molecular form ula: NH2CON=NCONH2(C2H4N4O2).

Molecular weight: 116.08.

Properties: This product is faint yellow powder. At normal atmospheric

temperature, it can be stored for a long time and it is not easy to go bad or

to lump.

This product is a strong organic foaming agent of heat decomposition type. The

decomposition temperature range is small. This product can be decomposed into

N2, CO, CO2. The product is free from poison, smell, color and pollution, but

it can be decomposed at high temperature(>120 Centigrade).

Uses: It is used as a foaming agent for producing various foamed plastics. It

is suitable for foaming plastic PVC, EVA, PP, PE, PS etc., especially suitable

for producing imitation leather and plastic products with high demands and

dense, homogeneous apertures. This product is used for obtaining the produced

products with good elasticity, homogeneous foamed apertures and high strength.

Packaging: 25kg/Carton

Storage: In the process of transportation and storage, this product can't be

placed hear and heat source and should be prevented from strong bump and

wetness.

 

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Website : www.thaipolychemicals.com

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