CN108822516A - A kind of preparation method of disposable polylactic acid high temperature resistant cup lid - Google Patents
A kind of preparation method of disposable polylactic acid high temperature resistant cup lid Download PDFInfo
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- CN108822516A CN108822516A CN201810760608.2A CN201810760608A CN108822516A CN 108822516 A CN108822516 A CN 108822516A CN 201810760608 A CN201810760608 A CN 201810760608A CN 108822516 A CN108822516 A CN 108822516A
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- plla
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- cup lid
- polylactic acid
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/06—Biodegradable
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/24—Crystallisation aids
Abstract
The invention discloses the preparation method of disposable polylactic acid high temperature resistant cup lid, each component and parts by weight are：Talcum powder, is first added in high-speed mixer by prior predetermined weight, adds aluminium titanium coupling agent by PLLA 73.8-86.5, PGA 5-10, talcum powder 8-15, aluminium titanium coupling agent 0.1-0.6, food-level white oil 0.4-0.6；The PLLA, PGA prepared in advance, food-level white oil are added sequentially in high-speed mixer again；It is 48 that draw ratio, which is added, in mixed material:Extrusion, tie rod, cooling, slice obtain PLLA modified resin particle in 1 double screw extruder；It is 44 that obtained PLLA modified resin particle, which is added to draw ratio,：Pulling-on piece is squeezed out in 1 single screw rod sheet extruder obtains PLLA sheet material；Obtained PLLA sheet material is heated in positive/negative-pressure thermoforming machine for plastics and bakes piece, isothermal crystal molding, punching, cuts to obtain the heat-resisting disposable hot drink cup lid of PLLA, the present invention is blended using PGA with PLLA, that there is no other small molecule organic nucleating agents is volatile, phenomena such as being precipitated, and greatly improves the safety in utilization of product.
Description
Technical field
The present invention relates to polymeric material field, in particular to a kind of preparation side of disposable polylactic acid high temperature resistant cup lid
Method.
Background technique
Polylactic acid is a kind of biodegradated polymer materal of natural bacteriostatic, and raw material sources are abundant and renewable, excellent
Performance, the multiple fields such as can blow using injection molding, plastic uptake, blow molding, note.But common polylactic acid glass transition temperature exists
Between 55-60 DEG C, heat distortion temperature is also very low, cannot close needed for daily life.In order to improve the heat-resisting temperature of polylactic acid article
Degree, domestic and foreign scholars do a lot of work, and mainly have blending, crystallization nucleation to improve polylactic acid crystal degree etc..For being blended, text
Offer report be all be blended using PLLA and non-biodegradable material PMMA, PC of other heatproofs etc. and obtained PLLA/PMMA,
PLLA/PC alloy etc., this way obtains PLLA modified material PMMA or PC ingredient therein cannot be biodegradable, also just loses
The meaning of degradable material itself.In addition it is exactly the addition small molecule organic nucleating agent in PLLA, common are hydrazides chemical combination
Object, amides compound and Phenylphosphine hydrochlorate etc., and small molecule nucleating agent is inherently unsatisfactory for the accessible condition of food, gained system
Product do not utilize protection human health.
Existing manufacture polylactic acid heat-resisting material mainly small molecule nucleating agent to be added in PLLA material, is then being infused
High temperature resistant product is made in isothermal crystal in mould, and this method formed product period is long, and usual a cycle needs 25-45
Second, high production cost, and small molecule nucleating agent is easily precipitated, unfavorable human health.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of preparation method of disposable polylactic acid high temperature resistant cup lid, with
It solves the above-mentioned multiple defects caused by the prior art.
To achieve the above object, the present invention provides technical solution below：A kind of disposable polylactic acid high temperature resistant cup lid
Preparation method, each component and parts by weight are：PLLA 73.8-86.5, PGA 5-10, talcum powder 8-15, aluminium titanium coupling agent 0.1-
0.6, food-level white oil 0.4-0.6, specific production stage are as follows：
Talcum powder is first added in high-speed mixer by the first step by prior predetermined weight, machine oil temperature rise to be mixed to 100
DEG C, aluminium titanium coupling agent is added, with 500r/min high-speed stirred 15 minutes；
Second step, then the PLLA, PGA prepared in advance, food-level white oil are added sequentially in high-speed mixer with 200r/
Min revolving speed stirs 2 minutes, releases the material mixed；
Third step, it is 48 that draw ratio, which is added, in mixed material:Extrusion in 1 double screw extruder, cooling, is cut tie rod
Piece obtains PLLA modified resin particle, and the barrel temperature of double screw extruder is 175 DEG C；
4th step, it is 44 that obtained PLLA modified resin particle, which is added to draw ratio,：In 1 single screw rod sheet extruder
It squeezes out pulling-on piece and obtains PLLA sheet material, the barrel temperature of single screw rod sheet extruder is 175 DEG C；
Obtained PLLA sheet material is heated roasting piece, isothermal crystal molding, punching in positive/negative-pressure thermoforming machine for plastics by the 5th step
Hole cuts to obtain the heat-resisting disposable hot drink cup lid of PLLA, wherein thermoforming machine temperature of heating plate be 85 DEG C, mold temperature 120
℃。
Preferably, the optical purity of the PLLA is 99.999%.
Preferably, the weight average molecular weight 150,000 of the PGA.
Preferably, 3 microns of the average diameter of the talcum powder.
It is using the beneficial effect of above technical scheme：A kind of preparation of disposable polylactic acid high temperature resistant cup lid of the invention
The polyglycolide (PGA) of a small amount of specific weight average molecular weight is added in method, the present invention in polylactic acid, and one, PGA itself are also raw
Object degradable material does not influence the degradation property of material itself；Second, PGA crystallization nucleation speed is fast, thermal deformation can reach after crystallization
To 200 DEG C or more, with after polylactic acid blend, PGA can accelerate the growth of polylactic acid crystal, and polylactic acid crystal speed is greatly improved
Degree；Third, PGA is high molecular polymer, there is no the precipitation problems of other small molecule nucleating agents.In addition, the present invention will use aluminium
The modified talcum powder of titanium coupling agent is added to the dimensional stability in PLLA/PGA system being used to improve product and reduction is produced into
This, the Biodegradable high molecular polymer P GA of the preferably specific weight average molecular weight of the present invention recycles positive/negative-pressure thermoforming machine for plastics
The isothermal stretch orientation crystallization for realizing poly-lactic acid material, greatly improves the nucleation efficiencies of polylactic acid, molding cycle is only
5-6 seconds, and heat resisting temperature can achieve 120 DEG C or more.
Specific embodiment
The preferred embodiment of the present invention.
Embodiment 1
High-speed mixer is added in the talcum powder of 15 parts by weight, 0.6 parts by weight are added to 100 DEG C in machine oil temperature rise to be mixed
Aluminium titanium coupling agent then sequentially added the PLLA of 73.8 parts by weight, 10 weight with 500r/min revolving speed high-speed stirred 15 minutes
The PGA of part, the edible grade white oil of 0.6 parts by weight, with 200r/min revolving speed stirring 2 minutes, mixing was completed, and released material；It will mix
It is 48 that draw ratio, which is added, in good material:Extrusion, tie rod, cooling, slice obtain PLLA modified resin grain in 1 double screw extruder
Son, wherein extruder barrel temperature is 175 DEG C；It is 44 that obtained PLLA modified resin particle, which is added to draw ratio,：1 single spiral shell
Pulling-on piece is squeezed out in bar sheet extruder and obtains PLLA sheet material, and wherein barrel temperature is 175 DEG C；By obtained PLLA sheet material positive and negative
Compression molding material thermoforming machine heats roasting piece, isothermal crystal molding, punching, cuts to obtain the heat-resisting disposable hot drink cup lid of PLLA, wherein
Thermoforming machine temperature of heating plate is 85 DEG C, mold temperature is 120 DEG C, gained PLLA disposable 4.9 seconds heat-resisting cup lid production cycles,
Isothermal stretch crystallization molding time 1.9 seconds in mold, 135 DEG C of cup lid heat distortion temperature；
Embodiment 2
High-speed mixer is added in the talcum powder of 8 parts by weight, 0.1 parts by weight are added to 100 DEG C in machine oil temperature rise to be mixed
Then aluminium titanium coupling agent sequentially added the PLLA of 86.5 parts by weight, 5 parts by weight with 500r/min revolving speed high-speed stirred 15 minutes
PGA, the edible grade white oil of 0.4 parts by weight, with 200r/min revolving speed stirring 2 minutes, mixing complete, release material；It will be mixed
Material be added draw ratio be 48:Extrusion, tie rod, cooling, slice obtain PLLA modified resin grain in 1 double screw extruder
Son, wherein extruder barrel temperature is 175 DEG C；It is 44 that obtained PLLA modified resin particle, which is added to draw ratio,：1 single spiral shell
Pulling-on piece is squeezed out in bar sheet extruder and obtains PLLA sheet material, and wherein barrel temperature is 175 DEG C；By obtained PLLA sheet material positive and negative
Compression molding material thermoforming machine heats roasting piece, isothermal crystal molding, punching, cuts to obtain the heat-resisting disposable hot drink cup lid of PLLA, wherein
Thermoforming machine temperature of heating plate is 85 DEG C, mold temperature is 120 DEG C, gained PLLA disposable 6 seconds heat-resisting cup lid production cycles, mould
Isothermal stretch crystallization molding time 3 seconds in tool, 130 DEG C of cup lid heat distortion temperature；
Embodiment 3
High-speed mixer is added in the talcum powder of 13 parts by weight, 0.4 parts by weight are added to 100 DEG C in machine oil temperature rise to be mixed
Aluminium titanium coupling agent then sequentially added the PLLA of 78.4 parts by weight, 8 weight with 500r/min revolving speed high-speed stirred 15 minutes
The PGA of part, the edible grade white oil of 0.2 parts by weight, with 200r/min revolving speed stirring 2 minutes, mixing was completed, and released material；It will mix
It is 48 that draw ratio, which is added, in good material:Extrusion, tie rod, cooling, slice obtain PLLA modified resin grain in 1 double screw extruder
Son, wherein extruder barrel temperature is 175 DEG C；It is 44 that obtained PLLA modified resin particle, which is added to draw ratio,：1 single spiral shell
Pulling-on piece is squeezed out in bar sheet extruder and obtains PLLA sheet material, and wherein barrel temperature is 175 DEG C；By obtained PLLA sheet material positive and negative
Compression molding material thermoforming machine heats roasting piece, isothermal crystal molding, punching, cuts to obtain the heat-resisting disposable hot drink cup lid of PLLA, wherein
Thermoforming machine temperature of heating plate is 85 DEG C, mold temperature is 120 DEG C, gained PLLA disposable 5.5 seconds heat-resisting cup lid production cycles,
Isothermal stretch crystallization molding time 2.3 seconds in mold, 134 DEG C of cup lid heat distortion temperature；
Embodiment 4
High-speed mixer is added in the talcum powder of 10 parts by weight, 0.2 parts by weight are added to 100 DEG C in machine oil temperature rise to be mixed
Aluminium titanium coupling agent then sequentially added the PLLA of 83.3 parts by weight, 6 weight with 500r/min revolving speed high-speed stirred 15 minutes
The PGA of part, the edible grade white oil of 0.5 parts by weight, with 200r/min revolving speed stirring 2 minutes, mixing was completed, and released material；It will mix
It is 48 that draw ratio, which is added, in good material:Extrusion, tie rod, cooling, slice obtain PLLA modified resin grain in 1 double screw extruder
Son, wherein extruder barrel temperature is 175 DEG C；It is 44 that obtained PLLA modified resin particle, which is added to draw ratio,：1 single spiral shell
Pulling-on piece is squeezed out in bar sheet extruder and obtains PLLA sheet material, and wherein barrel temperature is 175 DEG C；By obtained PLLA sheet material positive and negative
Compression molding material thermoforming machine heats roasting piece, isothermal crystal molding, punching, cuts to obtain the heat-resisting disposable hot drink cup lid of PLLA, wherein
Thermoforming machine temperature of heating plate is 85 DEG C, mold temperature is 120 DEG C, gained PLLA disposable 5.8 seconds heat-resisting cup lid production cycles,
Isothermal stretch crystallization molding time 2.5 seconds in mold, 133 DEG C of cup lid heat distortion temperature.
Based on a kind of above-mentioned, preparation method of disposable polylactic acid high temperature resistant cup lid, the present invention is added few in polylactic acid
The polyglycolide (PGA) of specific weight average molecular weight is measured, one, PGA itself are also biodegradation material, do not influence material itself
Degradation property；Second, PGA crystallization nucleation speed is fast, thermal deformation can achieve 200 DEG C or more after crystallization, with polylactic acid blend
Afterwards, PGA can accelerate the growth of polylactic acid crystal, and polylactic acid crystal speed is greatly improved；Third, PGA is high molecular polymer,
There is no the precipitation problems of other small molecule nucleating agents.In addition, the present invention will be added to the modified talcum powder of aluminium titanium coupling agent
For improving the dimensional stability of product and reducing production cost, the preferably specific weight average molecular weight of the present invention in PLLA/PGA system
Biodegradable high molecular polymer P GA, recycle positive/negative-pressure thermoforming machine for plastics realize poly-lactic acid material isothermal stretch
Crystallographic orientation greatly improves the nucleation efficiencies of polylactic acid, and molding cycle is only 5-6 seconds, and heat resisting temperature can achieve 120
DEG C or more, the present invention is blended using the organic high molecular polymer PGA of specified molecular weight with PLLA, and there is no other small molecules to have
Machine nucleating agent is volatile, phenomena such as being precipitated, and greatly improves the safety in utilization of product.With previous PLLA high temperature resistant injection-molded item phase
Compare, we obtain the heat-resisting cup lid short molding cycle of PLLA by positive/negative-pressure thermoforming crystallization technique, and heat-resisting effect is good, mentions significantly
High production efficiency.
What has been described above is only a preferred embodiment of the present invention, it is noted that for those of ordinary skill in the art
For, without departing from the concept of the premise of the invention, various modifications and improvements can be made, these belong to the present invention
Protection scope.
Claims (4)
1. a kind of preparation method of disposable polylactic acid high temperature resistant cup lid, each component and parts by weight are：PLLA 73.8-86.5,
PGA 5-10, talcum powder 8-15, aluminium titanium coupling agent 0.1-0.6, food-level white oil 0.4-0.6, specific production stage are as follows：
Talcum powder is first added in high-speed mixer by the first step by prior predetermined weight, machine oil temperature rise to be mixed to 100 DEG C,
Aluminium titanium coupling agent is added, with 500r/min high-speed stirred 15 minutes；
Second step, then the PLLA, PGA prepared in advance, food-level white oil are added sequentially in high-speed mixer with 200r/min
Revolving speed stirs 2 minutes, releases the material mixed；
Third step, it is 48 that draw ratio, which is added, in mixed material:Extrusion in 1 double screw extruder, cooling, is sliced tie rod
To PLLA modified resin particle, the barrel temperature of double screw extruder is 175 DEG C；
4th step, it is 44 that obtained PLLA modified resin particle, which is added to draw ratio,：It is squeezed out in 1 single screw rod sheet extruder
Pulling-on piece obtains PLLA sheet material, and the barrel temperature of single screw rod sheet extruder is 175 DEG C；
Obtained PLLA sheet material is heated roasting piece, isothermal crystal molding, punching, sanction in positive/negative-pressure thermoforming machine for plastics by the 5th step
It cuts to obtain the heat-resisting disposable hot drink cup lid of PLLA, wherein thermoforming machine temperature of heating plate is 85 DEG C, mold temperature is 120 DEG C.
2. a kind of preparation method of disposable polylactic acid high temperature resistant cup lid according to claim 1, the optics of the PLLA
Purity is 99.999%.
3. a kind of preparation method of disposable polylactic acid high temperature resistant cup lid according to claim 1, the PGA's divides equally again
Son amount 150,000.
4. a kind of preparation method of disposable polylactic acid high temperature resistant cup lid according to claim 1, the talcum powder is put down
Equal 3 microns of diameter.
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| CN201810760608.2A CN108822516B (en) | 2018-07-12 | 2018-07-12 | Preparation method of disposable polylactic acid high-temperature-resistant cup cover |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112920566A (en) * | 2021-03-05 | 2021-06-08 | 柳州塑友科技有限公司 | Modified PLA (polylactic acid) fully-degradable plastic and preparation method thereof |
| CN113429764A (en) * | 2021-06-11 | 2021-09-24 | 杨如麟 | starch/PLA-PGA-PBAT biodegradable and compostable special material and preparation method thereof |
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