Chemical Plastic

July 15, 2010

plastic chemical danger

Filed under: Chemical Plastic Research — Administrator @ 1:56 am

There’s a poignant scene in the film The Shawshank Redemption where an old prisoner is set free into a world that hardly resembles the one he left behind. Automobiles whiz past him as he tries to cross the street. His parole appointed job is at a fast paced market unlike any small town grocery store from his youth. It seems the whole world got in a great big hurry while he was away and he doesn’t like one bit. The speed of modern life is ever increasing. It’s hard to say how exactly this trend started. But it’s safe to say that at this point it’s driven primarily by consumer demand. A large enough segment of the population wants products and services that bring convenience home and streamline the many details that make up daily living.

In the 21st century, it’s hard to imagine a world in which plastic wouldn’t play a major role. After all, we drink from plastic bottles and wash our hair with shampoo that comes in similar looking containers. Our cars, phones, sunglasses and even the keyboards we type on are all made of this chemical compound. We are surrounded by plastic and what’s more, we’re happily hooked on it. That’s all good and well except for one thing: it may be harming us in unexpected ways. Today I’m going to focus on some recent findings on how chemicals in plastic may be altering the physiology and psychology of children throughout the world.

ADHD Linked to Phthalates

Phthalates are a variety of chemicals used to make plastic more flexible. They are commonly found in plastic wraps that are used to cover foods such as cheeses, meats and vegetables. But phthalates can also be present in cleaning items, personal care products, tubing and, most disturbingly, in toys. Many animal studies and some human studies have linked these specific elements to a variety of health conditions ranging from asthma to autism to birth defects to hormonal abnormalities and even obesity. Now, a new Korean trial has found a troubling association between phthalate concentrations and attention deficit hyperactivity disorder (ADHD) in children between the ages of 8-11. Urine tests were used to quantify the levels of this chemical in a group of 261 boys and girls. Those with the largest amounts of phthalates exhibited the most pronounced ADHD symptoms based on computerized tests and teacher reports that measured attention and impulsivity. The findings were described as presenting a “strong association between phthalate metabolites in urine and symptoms of ADHD”.

Boys Won’t Be Boys

A trial recently published in the International Journal of Andrology examined a proposed connection between elevated levels of phthalates in mothers’ prenatal urine and its subsequent affects on masculinity in preschool aged boys. A total of 145 children (aged 3.5 – 6.5) were included in this examination. Mothers who had higher prenatal levels of two phthalate metabolites (DBP and DEHP) generally had sons who exhibited less “male-typical behavior” such as fighting/”horsing around” and playing with trucks. The lead researcher of the study, Dr. Shanna H. Swan, theorized that phthalates may affect testosterone levels during a critical stage of male development in which sexual identity is formed. Previous studies have demonstrated a so called “phthalate syndrome” in male animals and boys which manifests in abnormal genital development.

Bisphenol A and Aggression in Girls

Bisphenol A (BPA) is another hormone disrupting chemical generally found in hard plastic products such as baby and water bottles, canned food linings and medical tubes. A report in the December issue of the journal Environmental Health Perspectives raises alarm about the effect of BPA in young girls. The source of BPA in these developing children is once again believed to be related to either prenatal exposure or a common environmental source that both mother and child share. A group of scientists examined prenatal urine samples from 249 women and compared them to the behavioral patterns of their related children. The mothers with the highest concentrations of BPA were more likely to have girls who were more aggressive and hyperactive at the age of 2 as compared to mothers with lower levels of BPA. One of the researchers commented that “girls whose mothers had higher BPA exposure were more likely to act like boys than girls”.

Dr. Andrew Weil, a leader in the field of alternative and complementary medicine, offers some sage advice about how to lower BPA and phthalate exposure for adults and children alike in his Fall 2009 Healthy Eating Guide. Dr. Weil suggests: a) cooking and microwaving only in ceramic or glass containers; b) opting for BPA-free baby bottles and stainless steel water bottles; c) avoiding the use of plastic wrap and placing plastic-wrapped market items in more suitable containers (glass) once at home and; d) choosing packaged foods and oils in glass bottles rather than plastic bottles or lined cans.

There’s no turning back the clock or putting the genie back in its lamp. Plastic is here to stay, at least for the foreseeable future. But we do have options about how and when you we choose to use it. A good place to begin your plastic transformation is at home. Avoiding BPA and phthalates outside of your abode can be more challenging. When you’re out and about, the key is to simply make the best choices that are available to you. Another way to promote change in this arena is to purchase products that specifically avoid the use of such questionable chemicals. You’ll often find that manufacturers will mention this on product labels or in the accompanying literature because it can be a selling point to informed consumers. In the same way that we the people have demanded a more convenient and speedier world, we too can demand a safer place for our current and future generations.

July 8, 2010

Shocking! White Trash Threaten Earth’s Oceans

Plastics have been around for, perhaps less than 100 years. So in the short span, there hasn’t been a group of microorganisms who have evolved who are capable of biodegrading plastics.

Scripps Institution of Oceanography in San Diego USA had taken a investigation and found that the area of Pacific Plastic Garbage Patch that lies between California and Hawaii is double of that of Texas.

Researchers said: “Unfortunately, there are a lot of plastic in oceans, Just one year, the Japan Coast will gather approx.150,000 tons of plastic debris”.  In a sense, you are placing all these plastics in the ocean, and eventually they will reach the deep ocean environment.

The increasing quantity of plastic now known to be in the oceans, plastic lasts a long time there, because cold sea water slows down the chemical reactions that cause a plastic bottle lying on a beach, for example, to break down.

It seemed that it is not the most terrible thing that the plastic gathered in oceans, there is a new study found that plastic decomposition will cause more pollution. Plastics in ocean biodegrade slowly and the biodegradation of plastic occured in ocean will cause bigger damages.

“Plastic maybe biodegraded at an alarming rate under the action of rain, sun and other environmental factors,” said the researchers. At the same time, they will may also release toxins contained bisphenol A to the oceans, bisphenol A are be deemed to has effect on disrupting hormonal function of animals, and act on animal’s reproductive system.

But if you define biodegradation as the complete conversion of plastics into carbon dioxide and water, all the plastics that we ever put into the ocean – which is over the past 50 to 60 years – would still be there in the ocean. And we keep adding more and more to it. And we do not know what the ecological consequences of this are. They might be very serious.

Earth’s oceans are absorbing carbon dioxide from the atmosphere, making the oceans more acidic. This could pose a threat to ocean life.

Around the world there are signs that plastic pollution is becoming a serious pollution and is threatening and destructing the environment, more terrifying it has begun to filtrated into the whole food chain of the earth gradually.

To  protect our common homeland, there is a lot of things we need to do!

June 8, 2010

Fungi Take a Bite out of Bisphenol A (BPA)

Preface: Environmental protection is a permanent topic, we all know plastic is very useful in our daily life, but it is not good for plastic being a permanent material, take it easy, now with help of fungi, the most stubborn plastic will disappeared obediently forever. Scientists chose three kinds of fungi and used them to clean the environment, now they are trying to improve conditions of decomposition of polycarbonate by fungi, that is a really a good news for people who are dealing with persistent pollutants with great effort.

Bisphenol A. Also called BPA, it’s used to make shatter-proof plastic known as polycarbonate, found in everything from water bottles to medical devices to the lining of food packaging. As much as 2.7 million tons of plastics are manufactured each year with BPA. But it’s also an endocrine disruptor posing a threat to fetuses and young children. And it’s been linked to cancer and metabolic disorders leading to obesity.

So how can plastics be properly disposed of to avoid releasing BPA into the environment? Some fungus may help. So say researchers publishing in the journal Biomacromolecules.
The scientists selected three fungi that are already used for environmental cleanup. They wanted to optimize conditions for the fungi to break down polycarbonate, so first they treated the plastic with ultraviolet light and heat. Untreated polycarbonate served as a control.

After 12 months, the untreated plastic hadn’t decomposed at all. But the fungi had munched through the treated plastic and used it all as an energy source. Even better, the BPA had been entirely broken down as well. Tests of the sample found no BPA residue. That’s good news in the effort to mop up a persistant pollutant.

April 7, 2010

Release Agent – Classification and Properties

Release agent can be divided into high polymer class, such as polysiloxane, organic fluorine polymers, and inorganic or organic class.

and chlorine-free halothane class, water-based release agents is in the trend.
The most general and usual release agent is methyl silicone oil used with performance as follows:

Colorless, odorless and transparent viscous liquid, with different molecular weight, the dynamic viscosity differs from 1 to 104 Pa • s, it is soluble in benzene, toluene, xylene, ethyl ether, etc., the refractive index is 1.38 ~ 1.40, density 0.82 ~ 0.97 g / cubic centimeter, thermal conductivity coefficient of 0.00028 ~ 0.00044 W / (m • 1 000), boiling point 152 ~ 250 ?, flash point 110-600 ?. So different viscosity has different nature.
Methyl silicone oil often used in high-temperature mold release of large-scale injection molded parts.

As to inorganic release agents, there are talc, mica, molybdenum disulfide, white clay, clay and so on, mixed with other assistant additives into release agent, and used in rubber industry generally.
As to organic release agents there are fatty acid soap (sodium soap, zinc soap, etc.), fatty acid, paraffin, white oil, vaseline, etc., essentially they can be considered as of inner lubricant or outer lubricant of plastic

In addition to methyl silicone oil, high polymer release agent also includes low molecular weight polyethylene, which is also a type of lubricant and dispersant, polyethylene glycol, epoxy derivatives, fluorine compounds.

March 25, 2009

Don’t re-use printing plastic bags

Filed under: Chemical Plastic Research — Tags: , — Administrator @ 3:49 am

In daily lives, housewives repeated use of plastic bags is nothing new. However, some experts pointed out that people should paid more attention on repeated use of plastic food packaging bag, especially the plastic bags with printing. Because they could make adverse effects on the human body.

The printing plastic bags must have lead. A lot of people enjoy the repeated use of plastic bags or placing the food in the plastic bag, which makes food contact lead directly.

The use of vinegar, one type of weak acid can filter out 0.1 mg of lead from the slice of bread size of the printing plastic bags, which is twice a day the amount of lead intake. The lead content is not sufficient to cause a clear threat to human health, but there is the potential adverse effects on the human body.

Polymer plastic used for new type of solar cells

Filed under: Chemical Plastic Research — Tags: — Administrator @ 3:12 am

University of Chicago researchers said, they synthesized a new polymer plastic materials may enhance the performance of solar cells at low-cost.

A professional said that the key of this technology is to improve the photoelectric conversion rate. In the past, the similar materials’ photoelectric conversion rate are 5% to 6%, and while the new material photoelectric conversion rates have increased to 8%, and also expected to improve in the future.

According to introduction, this patent has been bought by a solar power company form California.

Compared to traditional silicon solar cells, the polymer plastic solar cells have a low cost, easy to manufacture, so has the prospect of a much broader market.

March 16, 2009

Qingdao Jifa: PTFE membrane passes the identification

Filed under: Chemical Plastic Research — Tags: , — Administrator @ 3:35 am

A few days ago, Qingdao Jifa‘s production PTFE membrane and composite materials pass the identification.

Qingdao Jifa Group began to developed the technology of PTFE composite membrane in 2003. At the present, the production of PTFE has been used in high-end outdoor fabrics, medical protective clothing fabrics, military and police security equipment, such as functional fabrics fabrics and air purification filter, dust filter filtering. The products have been exported to Japan, Korea, Canada and other countries.

Newly developed ultra-thin PTFE composite fabrics can be used in the manufacture of medical textiles, personal hygiene supplies and other products.

March 2, 2009

NetworkRail use renewable plastics for new types of sleepers

Filed under: Chemical Plastic Research — Tags: — Administrator @ 2:45 am

Dayily waste may become a part of the railway in the future. This is based on a pilot from the UK NetworkRail. They use renewable plastics for new types of sleepers.

The pilot involved in about 20 tonnes of recycling waste materials into a new type of sleeper. These sleepers will replace some of the timber sleepers on the rural lines. During the trial, the NetworkRail will test whether they can stand the rigorous test of railway operations. If passed the test, it will be gradually extended to most of the railway.

The use of wasted plastic for recycled sleepers have a lot of advantages, at least can reduce the quantity of the buried garbage.

R & D and supply of sleepers from the i-plas, Inc. i-plas, Inc. is a waste plastic recycling business.

Indian researchers: a plastic bag can be used to pave the way

Filed under: Chemical Plastic Research — Tags: — Administrator @ 2:29 am

India Benares Hindu University researchers found a waste plastic bag can be used to enhance the life of the road, and has prepared to apply for a patent.

Indo-Asian News Service reported that on the 27th, because of non-biodegradable plastic bags, large-scale use of plastic bags has caused serious pollution of the environment. So, the new patent is a significance to the human.

The researchers said that after the heat treatment, the polyethylene which is a composition of plastic bags could parcel the stones used to pave the way, thereby effectively stick together with the coal tar. So the road will not crack easily after soaking.

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