CN102690489A - Paper-like air-permeable plastic film - Google Patents

Abstract

The paper-like air-permeable plastic film of the invention comprises calcium carbonate, SBS, low density polyethylene, and linear low density polyethylene. The plastic film has same mechanical strength as common films, but has unique performance; the appearance and handle are similar to those of thin rice paper or Maotou paper; the plastic film is beautiful, but has much higher strength than paper, and can resist water immersion. The film is air-permeable but water-impermeable. The film can substitute non-woven fabrics, but is different from non-woven fabrics, since non-woven fabrics are fabrics and have no film effect. At present, the film is mainly used as a fruit protective jacket in agriculture, as a roof waterproof protective layer in construction industry, as a down jacket lining for insulation in clothing industry, and as a preservative film in the vegetable field; the film has wider applications in the medicine and health field, such as medical mattresses, surgical gowns, operating sheets, medical pillowcases, hot compress pastes, disposable protective clothing for military use, antiseptic clothes for patients with burning, band-aid films, antiseptic adhesive plasters, sanitary napkins, and baby diapers.

Description

Like paper breathable plastic(s) film

The present invention relates to the plastic products technology field, exactly is " like paper breathable plastic(s) film ".The mechanical strength of plastic film of the present invention is as broad as long with general film, but it has very particular performances, and the outward appearance of this kind film is all similar with a very thin rice paper or burr paper, very beautiful with feel, but more much bigger than the intensity of paper, is not afraid of the water logging bubble.This kind film permeable watertight, it is to oxygen (O ₂), carbonic acid gas (CO ₂) and the steam permeable amount more much bigger than general commonly used sealed polyethylene plastic; But it is waterproof, because there is stronger hydrogen bond action between the liquid water molecules, its hydrogen bond moisture minor of concluding is about (H at normal temperatures ₂O) ₈About, so do not pass by thoroughly, water vapor is loose water molecules (H ₂O), so can be through going.This kind film can replace non-woven fabrics to use, but different with non-woven fabrics, non-woven fabrics is a cloth, does not have the effect of film.Now, be mainly used in the fruit protective sleeve on the agricultural; Construction industry is used for roof water-proof resist (claiming the house that meeting is breathed); On clothes, use as insulations such as down jackets linings; Dredge the dish field as preservative film.

Background of invention: the plastic film heat retaining property is fabulous; Also can do paired infrared rays has the heat retaining property plastic film of very strong iris action, still, because ventilation property is poor; Being used for interlining insulation people is through on one's body and feels bad; The moisture content that people's skin discharges can not be distributed, so the people feels very uncomfortable, and make clothes moist, promote bacterial growth, Imidazolidinyl Urea.Utilize air-permeable envelope tailoring lining, existing good heat-insulating property can be distributed sweat again and kept the dry and comfortable comfortable of skin surface to greatest extent, makees the down jackets lining with this air-permeable envelope now, has become a kind of New Product.This product is because it like the aesthetic appearances of paper property, can be used as disposable table linen, and it is also impermeable that vegetable soup sprinkles neither trickling, and thermotolerance, resistance to tearing are good; Can be used as the Dispoable medical apron, disposable cook uses apron; Its layer overlay filamentary material can be used as babies' napkin or women use sanitary napkin lining cloth; Also can be used as the cotton dress lining.

This film can be used as the protective membrane and the preservative film of taking fruits and vegetables of the banana fruit of growing owing to its ventilation property.The banana fruit of growing is the life entity of a work, and they constantly carry out " breathing ", and absorbing carbon dioxide is emitted oxygen; On permeable watertight film cover, can also prevent the damage of insect bite and dust storm, above agricultural chemicals is sprayed in the time of can also preventing to spray insecticide; Pollute fruit, improve the banana fruit quality, if for the banana fruit of growing with on the gas-impermeable film cover; Assemble tired a large amount of oxygen in the film, oxygen meeting oxidation banana fruit surface makes surperficial injured or ill; Fruits and vegetables after the harvesting remain the life entity of a work, and they constantly carry out gas and carry out redox reaction, emit carbonic acid gas and moisture, consume the various materials that accumulate in the body.If it is too fast that this process is carried out, fruits and vegetables are " aging death " fast just, occurs sallow, withered or rots, with being exactly the carrying out of limiting this process on the air-permeating film cover, the slow fruits and vegetables " aging death " that process is carried out slowly, promptly play freshening effect.If put into general plastic film, the book film is airtight or ventilation property is bad, and what oxygen got into lacks, and gas concentration lwevel increases, and disease, poisoning will appear in the fruits and vegetables cell, and macro manifestations is orange, rotten.

The forties in 20th century; American-European countries building scholar finds; Conventional waterproof material (like PE film, asphalt water-proof coiled material etc.) is because its stopping property characteristics, causes in steam is enclosed in for a long time in the building enclosure; Thereby initiation roofing and body of wall become damp and multiply mould, and IAQ and human settlement receive serious threat.Because steam is invaded and is had a strong impact on the performance of building thermal insulation material, thereby has increased building energy consumption.Condensation vapor has also quickened the aging of material of construction, the weather resistance of influence building. and the resistance to air loss of containment system, watertightness, vapour permeability are most important to building energy-saving property, weather resistance and comfortableness.American-European countries developed waterproof ventilated membrane and is widelyd popularize in late 1980s, and the waterproof ventilated membrane containment system is widely used in covil construction and commercial building, used the Architectural Construction of waterproof ventilated membrane to be described as " house that can breathe ".The Chinese government more and more paid attention to building energy conservation in recent years, improved constantly along with what energy-saving and environmental protection required, and the waterproof ventilated membrane containment system is paid attention to by industry gradually.

Make the plastic bag of doing shopping on the market with this film, the purchase of customer fruit and vegetable are returned can sack be tightened and are deposited the freshness-retained quite a while; Through experiment; Be contained in this book film bag like leek, little rape, garlic bolt, Chinese cabbage etc., in refrigerator freshness-retained seven days, from bag, take out still as before; Pack fish or meat with this kind bag film, phenomenon that they are perishable also can not occur making.Promote this kind packaging film, the person can save the purchase preservation agent to managing fruits and vegetables, can eat harmful preservation agent less to client.

This kind product also can be made the disposable plastic gloves, because it is ventilative, is with this kind gloves more comfortable than the band emgloves; Also available its tailoring insulating lining is because so it is the plastics good heat insulating, by because its breathes freely to put on the people being felt under the weather.

This kind film to the performance that it has, is particularly suitable for the packing of food from outward appearance, and is promptly attractive in appearance practical again.

This kind air-permeable envelope is used also more and more widely at pharmaceutical sanitary field, like medical bed mattress, operation dress, Operating sheet, Medical pillowcase, hot compress card, military disposable protective clothing, the fungi-proofing clothes of burn patient, adhesive bandage film, fungi-proofing surgical adhesive; Sanitary towel, baby diaper.

Abroad to the research of microporous breathable film be the sixties in 20th century so far; States such as the U.S., Britain, Japan have applied for tens of patents in this field now; Pore-forming mechanism to the composition of raw materials of microporous breathable film, manufacturing technology, microporous breathable film has been carried out deep research, and micro-porous permeable membrane technique and product are constantly improved and development.In America and Europe, Japan, Korea S, the Far East Area and area, China Hong Kong, the counterdie of air-permeable envelope as sanitary nursing article has been widely used.Application to air-permeable envelope will be more and more general, will bring into play bigger potentiality in more areas.China starts late to the research and the application of microporous breathable film, and about 5300 tons/year of the YO of China's air-permeable envelope now far can not be satisfied the needs of market development.

Air-permeable envelope has the people also to be called microporous breathable film, also reflects the ventilative mechanism of air-permeable envelope.Now, it is following to make the method for air-permeable envelope both at home and abroad:

1. high fill inorganic or organic fine particles method, like high calcium carbonate filled polyolefine modified material, it is processed film with rolling process or casting method or blow moulding, unilateral stretching or two-way stretch become microporous breathable film then; 2. the physical mechanical puncturing technique punctures pore-forming with corona discharge on film, processes microporous breathable film; 3. chemical foaming technology system microporous breathable film with containing the resin extruded of whipping agent and calendering film forming, is heated to foaming agent decomposition temperature with film again, and the whipping agent dissolving gas overflows, and on film, stays micropore, processes microporous breathable film; 4. the hollow fiber microporous membrane technology by melt-spinning-gel film forming-recrystallization processing-cold and hot stretching and heat setting type process, is processed microporous breathable film; 5. be separated into membrane technique, comprise and dissolve the thermic of the making peace micropore book membrane technique that is separated, dissolve in polymkeric substance earlier and form solutions i in the appropriate solvent; Water solution and on flat board, form film; Let solvent evaporates then, handle the book film again, promptly obtain the microporous breathable film that is separated; 6. the molecular film-forming of microporous network aggregated structure is technological, and the segmented copolymer that contains siloxanes has air permeability and good and ventilative plucking property of choosing because of its specific molecular structure, processes air-permeable envelope with this principle.

Brief summary of the invention:

The present invention provides a kind of like the paper air-permeable envelope to people, is to utilize a special composition of raw materials corning, on common inflation film manufacturing machine, blows out film with this raw material particle, air-permeable envelope.The gas permeation rate of using the plastic film of this kind made approximately is about 10 times of Vilaterm book film.Get the plastics bag of this book film folding footpath for the long 300mm of 300mm; Get the plastics bag of the general Vilaterm book film of same specification again, each aerification is obturaged, and then two plastics bags is respectively pressed 300 grammes per square metre things; Observe the gas situation of rushing down of two bags; In half an hour, the most book film that sees through of the gas in this kind book film bag is run away, and is seldom last; As and if gas in the general Vilaterm book film bag rushes down leakage seldom after 12 hours excessively, as before.With this air-permeable envelope bag filled with water, observe anhydrous spilling again.

Membrane formation mechanism: central block multipolymer SBS (styrene-butadiene-styrene ternary block polymer) with its specific molecular structure, has air permeability and good.Bring in funds and expect as follows (the thermoplastic elastomer handbook: the fertile gram of (U.S.A) B.M. is compiled P85)

Add a large amount of inorganic powder lime carbonate again; Using the SBS coated caco3, be coated on SBS on the lime carbonate and when book film inflation, be elongated and draw book, should be that the SBS (because SBS is an elastomerics insert be pearl in the plastics) of pearl becomes the book sheet disperseing in the plastics like this; Strengthened the ventilation property of SBS; Owing to add a large amount of lime carbonate and lime carbonate and coated, enlarged SBS dispersion area after the dispersion again, thereby made the book film of blowing become the air-permeable envelope of good air permeability by SBS.

The present invention utilizes the mutual relationship between the each component raw material of peculiar prescription, and the film outward appearance that blows out is exactly as burr paper or Chinese rice paper.This prescription has strict ratio restriction, does not add scope, and change influences the effect of book film outward appearance like paper than regular meeting.

The present invention embodies like this:

1. fill a prescription: lime carbonate 36%, SBS 22%, new LDPE (film grade) 21, linear low density polyethylene 21%

2. press. above-mentioned prescription scale honest material, evenly mixed with super mixer, cause particle with tablets press, blow out book film, thickness 1.5～2.0 roads (0.015～0.020mm) with general inflation film manufacturing machine again.Be air-permeable envelope.

Requirement to each material is following:

Lime carbonate, fineness 3200 orders (particle diameter≤4.2 μ m), whiteness>=90 do not have other particular requirement;

SBS, the styrene-butadiene-styrene ternary block polymer, butadiene content 70%, styrene content 30% in the multipolymer, domestic production producer, the trades mark such as the YH-791 of Yueyang general petrochemicals factory, the 1301-1 of Beijing swallow fossilisation company all can;

Linear low density polyethylene requires melt flow rate(MFR) 0.8～1.2g/10min, or melt flow rate(MFR) 1.0g/10min, domestic production producer, and the trades mark such as Liaoning LL0209AA of main office of Hua Jin chemical industry group, Daqing petrochemical DFDA-7047 all can;

New LDPE (film grade) requires about melt flow rate(MFR) 0.33g/10min, domestic production producer, and the LD165 of Beijing swallow fossilisation company, the trades mark such as LD166 all can.

Below in conjunction with embodiment invention is further specified:

Embodiment: connect prescription scale material

Lime carbonate _{8200 days}36%

SBS 22％

New LDPE (film grade) 21%

Linear low density polyethylene 21%

The material that above-mentioned scale is good is evenly mixed with super mixer, causes particle with tablets press, blows out book film, thickness 1.5～2.0 roads (0.015～0.020mm) with general inflation film manufacturing machine again.Be air-permeable envelope.

Claims (1)

1. The present invention is " like paper breathable plastic(s) film ".Its technical characterictic is:

   1. fill a prescription: lime carbonate 36%, SBS 22%, new LDPE (film grade) 21, linear low density polyethylene 21%