CN109705548A - A kind of method and its composite material reducing polylactic acid melting temperature using lactic acid monomer - Google Patents
A kind of method and its composite material reducing polylactic acid melting temperature using lactic acid monomer Download PDFInfo
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- CN109705548A CN109705548A CN201811581830.2A CN201811581830A CN109705548A CN 109705548 A CN109705548 A CN 109705548A CN 201811581830 A CN201811581830 A CN 201811581830A CN 109705548 A CN109705548 A CN 109705548A
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- lactic acid
- composite material
- polylactic acid
- acid monomer
- melting temperature
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Abstract
The present invention relates to a kind of methods and its composite material that polylactic acid melting temperature is reduced using lactic acid monomer, and polylactic acid is mixed with a small amount of monomer lactic acid, is subsequently poured into mixer and carries out melt blending.Polylactic acid-lactic acid composite structure that the smelting temperature of polylactic acid can only be effectively reduced with a small amount of lactic acid monomer, and obtained can be regulated with performance by adjusting the dosage of lactic acid monomer.
Description
Technical field
The present invention relates to a kind of processing methods of novel reduction polylactic acid melting temperature.
Background technique
Polylactic acid has good biocompatibility, degradability, mechanical property and processing performance, it is by lactide
Ring-opening polymerisation passes through hydrolysis by carbohydrate such as starch, celluloses in various reproducible natural resources, ferments, pure
To change, the resin that one kind obtained from polymerization is environmentally friendly, poly-lactic acid material has the advantages that high-intensitive, good mechanical properties,
But itself there is also some disadvantages, such as mechanical strength is inadequate, glass transition temperature it is excessively high make its with the life in life
Substance base phase melting mixing has that the disadvantages of fusing point differs larger, selling at exorbitant prices answers it when preparing composite material
With being restricted.
The fusing point of polylactic acid is excessively high, is unfavorable for carrying out processing with some biological materials preparing composite material, general life
Processing temperature required for substance sill is not too high, so the two mixes rear preparation-obtained composite property
Less stable, and some biomass-based materials solution in higher temperature is degraded, and biomass-based material is unfavorable for
It is widely applied, therefore the fusing point that research reduces polylactic acid by some chemical methodes extensively at present promotes polylactic acid more preferable
With biomass-based melting mixing.For example it is mentioned by the way that the plasticizer such as citrate ether, oligomer polylactic acid, polyethylene glycol are added
The flexibility and tensile strength of high polylactic acid, can also effectively reduce the glass transition temperature of polylactic acid；Either pass through
Addition gelatin and polylactic acid blend, which make the packed structures of polylactic acid change, can also reduce its glass transition temperature.But
This method needs to be added the such organic solvent of such as dimethyl sulfoxide as cosolvent, to the environment friendly of polylactic acid
Cause destruction.
Summary of the invention
For above-mentioned problems of the prior art, the present invention provides a kind of processing side of new reduction polylactic acid fusing point
Method, so that polylactic acid can effectively reduce the molten of polylactic acid in the case where a small amount of lactic acid monomer is added as plasticizer
Point, and the mechanical property of polylactic acid script is not influenced, it is a kind of proper for magnifying and being widely applied for poly-lactic acid material
Method.
The technical solution adopted by the present invention is that:
A kind of lactic acid composite material with low melting glass, including polylactic acid and lactic acid monomer, lactic acid monomer account for multiple
The 1%-10% of condensation material gross mass.
Preferably, the lactic acid monomer accounts for the 2% of composite material gross mass.
Preferably, the melting temperature of the composite material is lower than 20-50 DEG C of polylactic acid.
The present invention also provides a kind of methods for reducing polylactic acid melting temperature using lactic acid monomer, by polylactic acid and on a small quantity
Lactic acid monomer mixing, then pours the mixture into and carries out melt blending in mixer.
Preferably, lactic acid monomer accounts for the 1%-10% of composite material gross mass, more preferably 2%.
Preferably, the smelting temperature is 135-180 DEG C.
Preferably, the mixing time is 10-15min.
The present invention mixes polylactic acid with a small amount of lactic acid monomer, then carries out melt blending, due to lactic acid monomer and gathers
Hydrogen bond action between lactic acid destroys the interaction between script polylactic acid molecule chain, so that the melting temperature of polylactic acid
It reduces.
Compared with prior art, it can be effectively reduced the beneficial effects of the invention are as follows only with a small amount of lactic acid monomer poly-
The smelting temperature of lactic acid, and obtained polylactic acid-lactic acid composite structure and performance can be by adjusting lactic acid monomer
Dosage be regulated.
Specific embodiment
The preferred embodiments of the present invention will be described in detail below so that advantages and features of the invention can be easier to by
It will be appreciated by those skilled in the art that so as to make a clearer definition of the protection scope of the present invention.
Embodiment 1
Polylactic acid is mixed with the lactic acid monomer ratio uniform of 98:2 in mass ratio, pour into mixer temperature be 135
Until melting, obtains polylactic acid-lactic acid composite, this material designation is P98L2 for stirring at DEG C.
Embodiment 2-5
Preparation method is same as Example 1, the difference is that, smelting temperature becomes 180 DEG C, 160 DEG C, 140 DEG C and 130
℃。
Table one: influence of the lactic acid monomer of mass fraction 2% to polylactic acid melting effect
*Y is expressed as to melt, and N expression cannot melt.
Table one is the influence being added after the lactic acid monomer that mass fraction is 2% to polylactic acid fusing point.By the prior art it is found that
In the case where being not added with any plasticizer, the processing temperature of pure polylactic acid is 180 DEG C, adds the lactic acid list of mass fraction 2%
After body, the fusing point of polylactic acid is reduced to 135 DEG C from 180 DEG C, illustrates during mixing, and lactic acid can play increasing to polylactic acid
Mould effect.
Embodiment 6-9
Preparation method is same as Example 1, the difference is that, the mass fraction of lactic acid becomes 1%, 4%, 6% and
8%, obtained polylactic acid-lactic acid composite is respectively designated as P99L1, P96L4, P94L6, P92L8.
Comparative example 1
By pure polylactic acid pour into mixer temperature be 180 DEG C at stir, polylactic acid melts completely after 10min, obtains
To poly-lactic acid material, this material designation is P100L0.
Performance test
By embodiment 1 and 6~8 resulting composite materials and pure poly-lactic acid material in 160 DEG C~200 DEG C models in hot press
Enclose interior carry out tabletting.Then slice obtains after dumbbell shape sheet material that (6P-Ts2000s, the high product examine measurement equipment in Shenzhen are limited in puller system
Company) on carry out tensile test.According to ASTM D 882-81, tensile speed is set as 5mm min-1, fixture 40mm.Material is disconnected
Its breaking strength (σ is obtained after splittingb, MPa) and fault growth rate (εb, %), every group of sample, which measures 5 times, to be averaged.It is found that
Under the conditions of 180 DEG C, the tension fracture elongation rate of pure polylactic acid is 2.58%, tensile strength 59.20MPa.Composite material test
As a result as shown in following table two.
Table two: the lactic acid monomer of different quality containing is to polylactic acid process time and Effect on Mechanical Properties
Table two is that the lactic acid monomer of addition different quality containing in embodiment 1 and 6~8 is processed when melting to poly-lactic acid material
The influence of time and mechanical property, it is known that required close under same lower temperature when lactic acid monomer content is less
The refining time is longer, and when lactic acid monomer content is 2%, the melting time is obviously shortened.As lactic acid content increases to 8% by 2%
When, polylactic acid can melt under 135 DEG C of processing temperature, but melt effect and gradually decrease, required melting
Time is also increasingly longer, will cause the waste of plenty of time in actual processing.It is later discovered that by Mechanics Performance Testing,
Lactic acid content be greater than 2% after, with the increase of lactic acid content, the mechanical property of polylactic acid is gradually reduced, but with pure poly- cream
The mechanical property of acid is close, and it is smaller to illustrate that the addition of lactic acid influences the performance of lactic acid composite material.
The foregoing is merely a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto, any
Known those skilled in the art within the technical scope disclosed by the invention, can without the variation that creative work is expected or
Replacement, should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with claims institute
Subject to the protection scope of restriction.
Claims (9)
1. a kind of lactic acid composite material with low melting glass, it is characterised in that: including polylactic acid and lactic acid monomer, lactic acid
Monomer accounts for the 1%-10% of composite material gross mass.
2. lactic acid composite material according to claim 1, it is characterised in that: lactic acid monomer accounts for composite material gross mass
2%.
3. lactic acid composite material according to claim 1, it is characterised in that: the melting temperature of the composite material is lower than
Polylactic acid.
4. lactic acid composite material according to claim 1, it is characterised in that: the melting temperature of the composite material is relatively poly-
The melting temperature of lactic acid is 20-50 DEG C low.
5. a kind of method for reducing polylactic acid melting temperature using lactic acid monomer, it is characterised in that: by polylactic acid and a small amount of cream
Acid monomers mixing, then pours the mixture into and carries out melt blending in mixer.
6. according to the method described in claim 5, it is characterized by: lactic acid monomer accounts for the 1%-10% of composite material gross mass.
7. according to the method described in claim 5, it is characterized by: lactic acid monomer accounts for the 2% of composite material gross mass.
8. according to the method described in claim 5, it is characterized by: the smelting temperature is 135-180 DEG C.
9. according to the method described in claim 5, it is characterized by: the mixing time is 10-15min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811581830.2A CN109705548B (en) | 2018-12-24 | 2018-12-24 | Method for reducing melting temperature of polylactic acid by using lactic acid monomer and composite material thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811581830.2A CN109705548B (en) | 2018-12-24 | 2018-12-24 | Method for reducing melting temperature of polylactic acid by using lactic acid monomer and composite material thereof |
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| CN109705548A true CN109705548A (en) | 2019-05-03 |
| CN109705548B CN109705548B (en) | 2021-07-27 |
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| CN201811581830.2A Active CN109705548B (en) | 2018-12-24 | 2018-12-24 | Method for reducing melting temperature of polylactic acid by using lactic acid monomer and composite material thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1239523A (en) * | 1996-12-02 | 1999-12-22 | 金伯利-克拉克环球有限公司 | Multicomponent fiber |
| CN101525812A (en) * | 2008-12-31 | 2009-09-09 | 温州市瓯海昌隆化纤制品厂 | Polylactic acid non-weaving cloth with high strength and low thermal contraction and manufacture method thereof |
-
2018
- 2018-12-24 CN CN201811581830.2A patent/CN109705548B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1239523A (en) * | 1996-12-02 | 1999-12-22 | 金伯利-克拉克环球有限公司 | Multicomponent fiber |
| CN101525812A (en) * | 2008-12-31 | 2009-09-09 | 温州市瓯海昌隆化纤制品厂 | Polylactic acid non-weaving cloth with high strength and low thermal contraction and manufacture method thereof |
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| CN109705548B (en) | 2021-07-27 |
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