CN103834086A - Efficient controllable photooxidation-biodegradable plastic film and preparation method thereof - Google Patents
Efficient controllable photooxidation-biodegradable plastic film and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an efficient controllable photooxidation-biodegradable plastic film and a preparation method thereof. The plastic film comprises the following components in percentage by weight: 88-99% of polymer base material, 0.5-5% of hydrophilic modifier, 0.5-5% of nano titanium dioxide and 0.1-2% of light stabilizer. The preparation method disclosed by the invention comprises the steps of: melt blending and extrusion blow molding. The plastic film disclosed by the invention has the characteristics of high hydrophilcity, high degradation efficiency, high photocatalytic activity, wide light absorption range, short degradation time, controllable stable period, wide application range, simple production process, easiness for obtaining raw materials and the like, is suitable for the fields such as packages, agricultural films, plastic bags and the like, and can be degraded in a natural environment after being abandoned.
Description
Technical field
The invention belongs to degradable plastic film technical field, be specifically related to a kind of efficient controllable light oxidation-biodegradable plastic film and preparation method thereof.
Background technology
Plastics film consumption is very large, is widely used in the disposable product such as wrapping material, agricultural mulching, but with after be difficult to reclaim, discard occurring in nature be difficult for degraded, ecotope is caused to very large harm.Day by day serious along with " white pollution ", people are in the method that constantly searching is effectively dealt with problems, and through continuous effort, various degradative plasticss are come out one after another.Current, the most effective, economic degradation technique should be oxidation-biological degradation.Oxidation-biological degradation comprises two stages: first stage oxide breaks, subordinate phase biological degradation.And, the speed of biodegradation process depends on the oxide breaks stage that pro-oxidant brings out, the pro-oxidant of these interpolations can promote polymkeric substance and airborne oxygen generation oxidizing reaction and make macromolecular chain fracture under the effect of light and heat, make relative molecular weight drop to several thousand from hundreds of thousands of, when molecular weight little to a certain extent after, will be used as hydrocarbon source and absorb decomposition by natural bacterium and microorganism, finally be degraded into carbonic acid gas, water and soil ulmin.
Nano-TiO
2there is good photocatalysis performance, low price, non-secondary pollution, be incorporated into and in polymer degradation, obtained certain achievement.But the hydrophobicity of conventional polyolefine/TiO2 plastics film is poor, TiO
2with H
2the light-catalyzed reaction of O mainly only occurs in the film surface with humidity, and light-catalyzed reaction is difficult to occur in the inside of plastics, and degraded slowly.
At present, plastic film applications scope is the enhancing of augmentation and environmental consciousness day by day, and degradation plastic film has wide market outlook.But have many technical problems urgently to be resolved hurrily, biological example sill is directly prepared film with plastic blend, and cost is high, and degraded is incomplete simultaneously, the problem such as degrade uncontrollable; Adopt multi-layer compound film to prepare degradation plastic film, complex process, layer does not mate with interlayer, and appearance cannot be completely compound, and degraded is not exclusively.Prior art is most reaches high degradation rate by adding a large amount of biological materials, but the mechanical property of film cannot ensure, remaining plastics are difficult to continue degraded, and undegradable fragment still can cause environmental pollution.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of efficient controllable light oxidation-biodegradable plastic film is provided, this plastics film has the good mechanical property of conventional plastics film, processing characteristics, higher tear strength, elongation at break and tensile strength, simultaneously plastics film of the present invention can photoxidation-biological degradation, degraded thoroughly, can not produce harm to environment, can realize the degradation rate of plastics film is controlled by the adjustment of each component ratio.
Another object of the present invention is to provide the preparation method of above-mentioned efficient controllable light oxidation-biodegradable plastic film.
Above-mentioned purpose of the present invention is achieved by following technical solution:
One is controllable light oxidation-biodegradable plastic film efficiently, comprises the component of following weight percentage: polymeric substrate 88～98.9%, hydrophilic modifying agent 0.5～5%, nano titanium oxide 0.5～5%, photostabilizer 0.1～2%; Described polymeric substrate is one or more in the polyolefine such as Low Density Polyethylene (LDPE), linear low density polyethylene (LLDPE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), and molecular weight is 10K～60K; Described hydrophilic modifying agent is one or more in the hydrophilic polymers such as polyoxyethylene glycol (PEG), polyoxyethylene (PEO), polyvinyl alcohol (PVA), and molecular weight is 4K～500K.
In order to overcome polymeric substrate degraded not exclusively, the uncontrollable defect of degradation speed, the agent of the collaborative use of the present invention hydrophilic modifying, improves the wetting ability of film, and then promotes TiO
2light-catalyzed reaction in film, is conducive to microorganism to the adhering to of film in addition adding of hydrophilic modifying agent, further improves the palliating degradation degree of film.But be not that all hydrophilic modifying agent can be suitable for, reason is that the consistency of most of hydrophilic modifying agent and polymeric substrate of the present invention is poor, both can not melt blending, and then can not prepare well behaved plastics film.Test by great many of experiments, the present invention just show that described hydrophilic modifying agent is that PEG, PEO or PVA and polymeric substrate consistency of the present invention are good, can absorb airborne moisture simultaneously, and raising film wetting ability, makes TiO
2be easy to contact wetting, promote photo-oxidative degradation reaction.
Also find by experiment, the molecular weight of hydrophilic modifying agent need to be controlled within the specific limits, if molecular weight is too low, hydrophilic effect is not obvious, limited to the absorption of moisture; Molecular weight is excessive, and the consistency of hydrophilic modifying agent and polymeric substrate of the present invention declines, and easily crystal aggregation, causes TiO
2degradation efficiency reduce on the contrary, the molecular weight that can realize the hydrophilic modifying agent of the object of the invention is 4K～500K.
Preferably, the molecular weight of described hydrophilic modifying agent is 10K～50K, and degradation of plastic film and mechanical property are more excellent.Most preferably, the molecular weight of described hydrophilic modifying agent is 10K, degradation of plastic film and mechanical property optimum.
As a kind of preferred version, described hydrophilic modifying agent is one or both of PEG or PEO, and PEG or PEO and polymeric substrate consistency the best of the present invention, be more conducive to melt blending and masking, all kinds of performances of plastics film that make are more excellent, as mechanical property, hydrophilicity, degradation property etc.Most preferably, described hydrophilic modifying agent is PEG, the best performances such as the degraded of photoxidation-biodegradable plastic film and machinery.Synthetic method and the end group etc. of PEG of the present invention and PEO is all different, says and do not belong to same material on stricti jurise, although molecular backbone chain structure is the same, end group is different with molecular weight, and both are the common agents that this area routine can be bought.
Hydrophilic modifying agent of the present invention need be controlled within the specific limits, if add-on is very few, film hydrophilicity increases not obvious, cause the plastics film can not complete biodegradable, but also not add-on is the bigger the better, reason is that hydrophilic modifying agent add-on is too much, can cause polymeric substrate and hydrophilic modifying agent melt blending melt viscosity to increase, film forming difficulty in film-forming process, be difficult for processing, and degradation property improves not obvious, cost is high, plastics film product does not meet actual operation requirements, thereby the add-on of controlling hydrophilic modifying agent could realize the object of the invention 0.5%～5%.
Polymeric substrate of the present invention is selected one or more in LDPE, LLDPE, PP, PVC or PS, object be conventional purposes in order to meet this area plastics film and for special purpose as preservative film, packing film and heat-shrinkable film etc., number-average molecular weight 10K～60K.As a kind of preferred version, described polymeric substrate is LDPE, and number-average molecular weight is 20K～50K, and the plastics film product tensile property and the degradation property that make are more excellent.
The present invention, using nano titanium oxide as photocatalyst, causes light-catalyzed reaction degradation plastic film under illumination condition, and the particle diameter of nano titanium oxide is less, and specific surface area is larger, and catalytic performance is stronger, but particle diameter is less, and preparation difficulty is larger, and cost is higher; Titanium dioxide has three kinds of crystal formations, anatase octahedrite, rutile and brookite, and research shows that anatase octahedrite photocatalysis efficiency is the highest, so as a kind of preferred version, the particle diameter of described nano titanium oxide is 10～50 nanometers, crystal formation is taking anatase octahedrite as main.
The effect of photostabilizer of the present invention is the degradation speed of collaborative hydrophilic modifying agent and photocatalyst control plastics film, as a kind of preferred version, described photostabilizer is that one or more of hindered amine light stabilizer (HALS) are composite, HALS effect compared with traditional photostabilizer is strong 2～4 times, low toxicity or nontoxic, can meet the requirement of film article material.The kind that the present invention can select domestic hindered amine light stabilizer (HALS) to buy, comprises one or more in photostabilizer 622, photostabilizer 770, photostabilizer 783, photostabilizer 791, photostabilizer 944 or photostabilizer 3853.The present invention found through experiments, in the middle of the conventional photostabilizer in this area, described photostabilizer adopts HALS to be more conducive to the control of photodegradable speed of the present invention, reason may be that HALS can catch the living radical generating in high molecular weight reactive under optically catalytic TiO 2, thereby suppress the process of photoxidation, reach light and stablize object, and the photostabilizer of the conventional other types in this area is all inferior to HALS as photomask agent, UV light absorber and quencher effect.
The preparation method of the efficient controllable light oxidation-biodegradable plastic film of the present invention, concrete steps are that the component of above-mentioned specified weight per-cent is mixed, melt blending, the master batch after melting mixing, makes plastics film through blowing.
The temperature of described melt blending is 160～210 DEG C.
The corresponding adjustment according to actual needs of the thickness of described plastics film, as a kind of preferred version, the thickness of described plastics film is 10～150 microns, applicable situation is the widest.As more preferably scheme of one, the thickness of described plastics film is 80 microns.
Efficient controllable light oxidation-biodegradable plastic film of the present invention adopts hydrophilic modifying agent and the photostabilizer of specified proportion, and synergic nano titanium dioxide is prepared plastics film.Ensureing that plastics film has under the prerequisite that can meet the needed associated mechanical intensity of actual use and mechanical strength, the use of hydrophilic modifying agent has improved the wetting ability of plastics film, can promote the photocatalytic degradation of nano titanium oxide, improve the palliating degradation degree of plastics film; The use of photostabilizer simultaneously can realize the control of plastics film biodegradation rate, ensures that plastics film extends the work-ing life of plastics film under the prerequisite of energy complete biodegradable.
The consumption of photostabilizer of the present invention also needs to be controlled at specific scope, if consumption is very few, can not effectively play a role, and causes plastics film in use because of illumination fast degradation, loses use value; If consumption is too much, can cause degradation of plastic film speed excessively slow, long-time discarding also do not degraded completely, still pollutes the environment, and excessive photostabilizer also can reduce the mechanical property of plastics film in addition, increases difficulty of processing, raises the cost.
The consumption of nano titanium oxide of the present invention also needs to be controlled at specific scope, if consumption is very few, the photocatalysis of plastics film product is not obvious, is difficult to complete biodegradable; If consumption is too much, high cost, excessive nano titanium oxide does not make full use of, and causes waste, and processing characteristics is impact to some extent also, and reason may be nano-TiO
2concentration reaches a timing, and particle is easily reunited, and affects degradation effect, and utilization ratio reduces.In addition, the consumption of nano titanium oxide also needs according to the consumption of hydrophilic modifying agent and photostabilizer and corresponding adjustment, cooperation could realize the control to degradation of plastic film speed.The consumption of nano titanium oxide of the present invention is defined as 0.5～5%, can realize the efficiently controlled, practical of inductive phase of photoxidation-biodegradable plastic film and degradation rate.
Test by great many of experiments, the used in amounts of polymeric substrate of the present invention is controlled at the performances such as machinery, processing and the mechanics of the preparation-obtained plastics film of 88～99% guarantee can meet daily film user demand.The present invention is by controlling the consumption of hydrophilic modifying agent, nano titanium oxide and the each component of photostabilizer, the inductive phase of the efficient controllable light oxidation-biodegradable plastic film preparing be 1 month to 4 years not etc., embrittlement phase and degradable phase do not shorten to 6 months to 3 years not etc. greatly, can adapt to the needs of the film product of different purposes.
Compared with prior art, the present invention has following beneficial effect:
(1) efficient controllable light oxidation-biodegradable plastic film of the present invention, by increasing film wetting ability, degradation efficiency improves 30%, and its degradable film effect is remarkable, degraded rate of weight loss can reach 40～85%, and material can be degraded to substantially the small shreds without intensity, powder even; Oxidative degradation rear film has good biological degradability, and the 45 days biological degradation mineralization rates of diaphragm seal compost after illumination 300h can reach 2.0～3.2%.
(2) efficient controllable light oxidation-biodegradable plastic film of the present invention, inductive phase be 1 month to 4 years not etc., embrittlement phase and degradable phase do not shorten to 6 months to 3 years not etc. greatly, can adapt to the needs of the film product of different purposes, as fields such as packaging and plastics bags, be specially adapted to controlled degradation film for agricultural use.
(3) efficient controllable light oxidation-biodegradable plastic film provided by the invention, the inexpensive environmental protection of its raw material, preparation technology is simple and have photodegradation, biological degradation, photochemical catalysis and a several functions such as dustproof; The composite modified technology of the resins such as this hydrophilic modification method, titanium dioxide and polyolefine, extends to other plastics-production Application Areass.
Brief description of the drawings
Fig. 1 is the rate of weight loss graphic representation under the hydrophilic controllable light oxidation-biodegradable plastic film ultraviolet lighting that does not add photostabilizer of the present invention, and a-h is corresponding to comparative example 1,2, embodiment 14-19.
Fig. 2 is the rate of weight loss graphic representation under the hydrophilic controllable light oxidation-biodegradable plastic film illumination of interpolation different content photostabilizer of the present invention, and a-e is corresponding to embodiment 1-5.
Fig. 3 is the tensile strength of hydrophilic controllable light oxidation-biodegradable plastic film of the present invention under ultraviolet lighting, and a-i is corresponding to comparative example 1,2, embodiment 14-19, embodiment 2.
Fig. 4 is the elongation at break of hydrophilic controllable light oxidation-biodegradable plastic film of the present invention under ultraviolet lighting, and a-i is corresponding to comparative example 1,2, embodiment 14-19, embodiment 2.
Fig. 5 is the scanning electron microscope image of hydrophilic controllable light oxidation-biodegradable plastic film of the present invention after ultraviolet lighting, and a-f is corresponding to comparative example 1,2, embodiment 14,15, embodiment 17,19.
Fig. 6 is biological degradation mineralization rate graphic representation under the sealing compost of hydrophilic controllable light oxidation-biodegradable plastic film of the present invention illumination after 300 hours, and a-d is corresponding to comparative example 1,2, embodiment 14,19.
Embodiment
Below in conjunction with specific embodiment, the present invention is further explained, but embodiments of the present invention is not limited in any way.Unless stated otherwise, in embodiment, related reagent, method is the conventional reagent in this area and method.
(1) formula of each embodiment and comparative example (consumption of each component by weight percentage) as shown in table 1 below.
The formula of the each embodiment of table 1 and comparative example
(2) preparation method of each embodiment and comparative example plastics film is as follows:
Take principle by the proportioning of the each embodiment of table 1 or comparative example, in high-speed mixer, mix, for subsequent use.Forcing machine condition: 100～120 DEG C, a district, two 120～140 DEG C, districts, three 140～160 DEG C, districts, four 160～180 DEG C, districts, five 165～185 DEG C, districts, 165～185 DEG C of heads.Temperature adds the raw material mixing in feeding hopper after reaching and stablizing, and regulates main frame and feeding machine rotating speed, and raw materials melt is extruded, and crosses water, dries up, and is cut into master batch, then by dried master batch for subsequent use.Inflation film manufacturing machine temperature is then set: 100～110 DEG C, a district, two 125～135 DEG C, districts, three 145～155 DEG C, districts, 145～155 DEG C of die heads.Temperature is opened host switch after reaching and stablizing, and adjusting rotary speed, adds master batch, extrusion-blown modling film forming, and film thickness is about 80 microns.
(3) dependence test step
Film sample is placed in to the internal radiation of ultraviolet device for fast detecting aged sample, sample is apart from light source 10cm, weigh at set intervals, calculate the rate of weight loss of film, characterize film light by high-temperature gel permeation chromatography (HTGPC) and scanning electron microscope (SEM) and shone the change of molecular weight of front and back and the variation of surface topography, test its tensile strength and elongation at break by GB GB/T1040.3 " mensuration of plastic tensile performance the 3rd part: the test conditions of film and thin slice " with the omnipotent test machine of material, photodegradation is put into biological compost device and is carried out biological degradation after 300 hours, and draw sample mineralization rate.Be converted into number of days and the required number of days of degradative phase inductive phase according to light radiation, and contrast with actual environment degraded situation.The annual total solar radiation amount in Guangzhou (45 °) is 4463MJm
-2, ultraviolet radiation amount accounts for 4%, and annual Solar Ultraviolet Radiation Over amount is 178.5MJm
-2, test conditions Radiant UV Power is 150Wm
-2, 1 hour radiation quantity of illumination is 0.54MJm
-2, be equivalent to the actual environment illumination ultraviolet radiation of 1.1 days.
(4) film degradation performance
1, the comparison of comparative example and embodiment
Embodiment and comparative example comparison (as Fig. 1 and Fig. 3), add when drawing due to photocatalyst nano titanium oxide and hydrophilic modifying agent, and film degradation speed is improved largely; Being used in conjunction with of photostabilizer in addition, makes film light according to there is inductive phase early stage, and in inductive phase, film performance reduces not quite, realistic service requirements, and the degradative phase after inductive phase can be degraded rapidly again, has larger rate of weight loss and biologically digesting.Test result is surface all, and the degradation property of photoxidation-biodegradable plastic film that the present invention makes is efficiently controlled, is the degradation plastic film of excellent property.
The test result of embodiment all illustrates and regulates each recipe ingredient described in this patent can reach different film performance and degradation effects, for different environments for use, requirement, can design a series of photoxidation-biodegradable plastic films, has very strong practicality.
2, embodiment 1～5 adds the efficient controllable light oxidation-biodegradable plastic film of different content photostabilizer (HALS)
3, embodiment 6～9 adds the efficient controllable light oxidation-biodegradable plastic film of different content nano TiO 2
Embodiment 6～9 adds different content nano-TiO
2efficient controllable light oxidation-biodegradable plastic film, all there is inductive phase in photoxidation-biodegradable plastic film under illumination, embodiment 6 nano-TiOs
2content is minimum, and be 250 hours inductive phase the longest, due to nano-TiO
2the increase of content, degradation rate increases, and shorten to 180 hours of embodiment 9 corresponding inductive phase, and not disappear inductive phase, and degradation of plastic film is keeping controllability.Degraded test result also shows, nano-TiO
2when content is low, increase TiO
2content, degradation effect is obvious, after being greater than 3%, increases TiO
2content, degradation effect is not obvious.
4, embodiment 10～13 adds the efficient controllable light oxidation-biodegradable plastic film of different sorts hydrophilic modifying agent
And comparative example 3,4 employing polyacrylamides (powder) or sodium polyacrylate (powder) are hydrophilic modifying agent, because above-mentioned two kinds of hydrophilic polymers cannot melting in certain temperature range, can not reach mixing of molecular level with polymeric substrate, it is only physical dispersion, although the plastics film making has improved the wetting ability of film, hydrophilic polymer does not have clad nano TiO
2, Photocatalytic Degradation Property improves limited, and film surface has particle, affects outward appearance and mechanical property.
5, embodiment 14～19 adds the efficient controllable light oxidation-biodegradable plastic film of different molecular weight hydrophilic modifying agent
Embodiment 14～19 adds the efficient controllable light oxidation-biodegradable plastic film of different molecular weight hydrophilic modifying agent, rate of weight loss curve under ultraviolet lighting as shown in Figure 1, as can be seen from the figure the degradation rate of embodiment 14～19 speed films significantly improves compared with comparative example 2 speed films, and PEG(or PEO are described) interpolation the degradation rate of plastics film is greatly improved.Molecular weight is PEG(or the PEO of 10K to 50K) to stronger (embodiment 15,16) of the degraded promoter action of plastics film, PEG(or PEO) molecular weight there is optimum value to improving the degraded rate of weight loss of plastics film, molecular weight is not to be the bigger the better, possible cause is PEG(or the PEO of macromolecule) easily crystal aggregation, cause TiO
2degradation efficiency reduce.PEG(or PEO) all can have greatly improved to the wetting ability of plastics film, film surface moisture can enter inside, thereby promote the TiO2 of film inside to react, improve degradation efficiency, as can be seen from Figure 1, the PEG that molecular weight is 10K promotes to use most (embodiment 15) the most by force to the degraded of plastics film.
6, embodiment 20～23 adds the efficient controllable light oxidation-biodegradable plastic film of different content hydrophilic modifying agent (PEG10K)
Embodiment 20～23 adds the efficient controllable light oxidation-biodegradable plastic film of different content hydrophilic modifying agent, and under ultraviolet lighting, along with the increase of hydrophilic modifying agent (PEG10K) content, wetting ability increases, and degradation rate increases.But in experimentation, in the time that PEG10K content exceedes 5%, when blown film, melt viscosity is very large, film forming difficulty, is difficult for processing, is unfavorable for suitability for industrialized production in the future, and degradation property raising is not obvious, can not be by the content of raising PEG.
7, efficient controllable light oxidation-biodegradable plastic film that the efficient controllable light oxidation-biodegradable plastic film embodiment 24～28 of embodiment 24～28 different polymeric substrates is different polymeric substrates.Under ultraviolet lighting, all there is certain degraded inductive phase in the film of different polymeric substrates, and has good degradation effect, after inductive phase, can degrade rapidly.Be described adding of titanium dioxide optical catalyst, all can improve the degradation property of the polyolefins plastics films such as LDPE, LLDPE, PP, PVC or PS, wherein, the degradation property of LDPE laminated film is more excellent, and mechanical property is also more excellent.
8, the efficient controllable light oxidation-biodegradable plastic film of embodiment 29～32 typical case
The efficient controllable light oxidation-biodegradable plastic film of embodiment 29～32 typical case.Embodiment 29 is the fastest maximum plastics film of degradation rate, add 0.1% photostabilizer, be 30 hours inductive phase, degradative phase film rate of weight loss reaches 80% need 150 hours, being converted into actual environment inductive phase is 1 month, and degradative phase is probably 6 months, after degraded, is fragment and Powdered, and molecular weight is lower, be easy to biological degradation.Embodiment 32 is that inductive phase is the longest, is 1400 hours, and degradative plastics is the slowest, degradative phase weightlessness reaches 80% needs 1000 hours, be converted into actual environment and be approximately 48 months inductive phase, degradative phase is probably 36 months, can adapt to using and applicable cases that degraded demand is not high of long period.It is 6 months, 18 months that embodiment 30, embodiment 31 make plastics film can accurately be controlled inductive phase, and degradative phase is 9 months, 12 months.
9, efficient controllable light oxidation-biodegradable plastic film performance characterization
Number-average molecular weight (M before and after comparative example and embodiment plastics film ultraviolet lighting
n) and weight-average molecular weight (M
w) as
Shown in table 2.
Molecular weight before and after table 2 plastics film ultraviolet lighting
As can be seen from Table 2, illumination is after 300 hours, the number-average molecular weight of comparative example 1 (Mn) and weight-average molecular weight (M
w) only reduce respectively 73.8% and 64.9%, the M of comparative example 2
nand M
wreduce respectively 82.7% and 88.0%, and the M of embodiment 2
nand M
wreduce respectively 85.1% and the M of 88.1%, embodiment 8
nand M
wreduce respectively 90.0% and the M of 91.1%, embodiment 15
nand M
wreduce respectively 92.6% and the M of 93.0%, embodiment 16
nand M
wreduced respectively 93.9% and 94.2%, illustrated and can improve film degradation adding of titanium dioxide, and hydrophilic modifying agent add the palliating degradation degree that can further improve film, the reduction of film molecular weight is conducive to the biodegradability of film.
The tensile strength of comparative example and embodiment plastics film and elongation at break are as shown in Figure 3, Figure 4, as seen from the figure, plastics film all has higher mechanical property, before illumination, tensile strength major part is greater than 15MPa, elongation at break is all greater than 130%, the film of different ingredients, performance difference is little, complete realistic service requirements, after degraded, film physical strength elongation at break reduces rapidly, illustrate that film is easily cracked, become fritter and powder, be easy to contact with microorganism, accelerate biodegradation rate.
As shown in Figure 5, wherein a-f distinguishes corresponding comparative example 1, comparative example 2, embodiment 14, embodiment 15, embodiment 17, embodiment 19 to scanning electron microscope diagram after comparative example and embodiment plastics film ultraviolet lighting.As can be seen from Figure 5, ultraviolet lighting is after 300 hours, above substantially do not change LDPE/TiO for ldpe film is apparent
2film surface has produced some holes, and adds the film havoc after hydrophilic improving agent, occurs a large amount of pore space structures, is spongy, illustrates that the interpolation of hydrophilic modifying agent (PEG or PEO) improves photocatalysis performance and the biodegradability of film greatly.
Under comparative example and the sealing compost of embodiment plastics film ultraviolet lighting after 300 hours, biological degradation mineralization rate curve as shown in Figure 6, as can be seen from Figure 6, after ultraviolet lighting 300 hours, the mineralization rate of comparative example film is lower, not higher than 1.5%, but add the mineralization rate of embodiment after hydrophilic modifying agent to significantly improve, the highlyest exceed 3.2%, illustrate that the interpolation of hydrophilic modifying agent (PEG or PEO) improves photocatalysis performance and the biodegradability of film greatly, be conducive to prepare oxidation-biodegradable plastic film, promote significant to efficient controllable light oxidation-biodegradable plastic film.
Claims (10)
1. efficient controllable light oxidation-biodegradable plastic film, is characterized in that, comprises the component of following weight percentage: polymeric substrate 88 ~ 98.9%, hydrophilic modifying agent 0.5 ~ 5%, nano titanium oxide 0.5 ~ 5%, photostabilizer 0.1 ~ 2%; Described polymeric substrate is one or more in Low Density Polyethylene, linear low density polyethylene, polypropylene, polyvinyl chloride, polystyrene, and molecular weight is 10K ~ 60K; Described hydrophilic modifying agent is one or more in polyoxyethylene glycol, polyoxyethylene, polyvinyl alcohol, and molecular weight is 4K ~ 500K.
2. efficient controllable light oxidation-biodegradable plastic film according to claim 1, is characterized in that, the molecular weight of described hydrophilic modifying agent is 4K ~ 50K.
3. efficient controllable light oxidation-biodegradable plastic film according to claim 2, is characterized in that, the molecular weight of described hydrophilic modifying agent is 10K.
4. efficient controllable light oxidation-biodegradable plastic film according to claim 1, is characterized in that, described hydrophilic modifying agent be polyoxyethylene glycol or polyoxyethylated one or both.
5. efficient controllable light oxidation-biodegradable plastic film according to claim 1, is characterized in that, described hydrophilic modifying agent is polyoxyethylene glycol.
6. efficient controllable light oxidation-biodegradable plastic film according to claim 1, is characterized in that, described polymeric substrate is Low Density Polyethylene, and molecular weight is 20K ~ 50K.
7. efficient controllable light oxidation-biodegradable plastic film according to claim 1, is characterized in that, the particle diameter of described nano titanium oxide is 10 ~ 50 nanometers, and crystal formation is taking anatase octahedrite as main.
8. efficient controllable light oxidation-biodegradable plastic film according to claim 1, is characterized in that, described photostabilizer is hindered amine light stabilizer.
9. the preparation method of efficient controllable light oxidation-biodegradable plastic film described in claim 1 ~ 8 any one, is characterized in that, concrete steps are that the component of weight percent described in claim 1 is mixed, melt blending, and blowing makes plastics film.
10. preparation method according to claim 9, is characterized in that, the thickness of described plastics film is 10 ~ 150 microns.
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