CN103788485A - Method for improving heat stability of polypropylene plastic - Google Patents

Method for improving heat stability of polypropylene plastic Download PDF

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Publication number
CN103788485A
CN103788485A CN201410014562.1A CN201410014562A CN103788485A CN 103788485 A CN103788485 A CN 103788485A CN 201410014562 A CN201410014562 A CN 201410014562A CN 103788485 A CN103788485 A CN 103788485A
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China
Prior art keywords
xylogen
blend
polypropylene
described step
improves
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Pending
Application number
CN201410014562.1A
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Chinese (zh)
Inventor
余木火
陈磊
刘淑萍
张文辉
张静洁
王海风
韩克清
荣怀苹
覃辉林
严斌
王丹
景鹏展
张建军
柯盛包
李双江
王会峰
吴玉霞
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Donghua University
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Donghua University
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Priority to CN201410014562.1A priority Critical patent/CN103788485A/en
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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
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/78—Measuring, controlling or regulating of temperature
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L97/00—Compositions of lignin-containing materials
    • C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76531—Temperature
    • 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
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Medicinal Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Materials Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention relates to a method for improving the heat stability of polypropylene plastic. The method comprises the steps of (1) uniformly mixing lignin and polypropylene according to a mass ratio of (5:95)-(20:80), and performing melt blending on a mixture under the temperature of 150-250 DEG C to obtain a uniformly mixed blend; and (2) adding the blend into a material feeding hopper of a micro injection molding machine for melting under the temperature of 170-240 DEG C, injecting a mixture melt into a mold, and cooling to obtain a blended sample. The technology of the method disclosed by the invention is simple; an operating method is simple, and the cost is low; the lignin can realize a certain heterogeneous nucleation function in a polypropylene crystallization process, so that the crystallinity and the crystallization property of polypropylene can be improved; meanwhile, due to the influence of a three-dimensional meshed structure of the lignin, the heat resistance of a composite material can be improved; and the method can be popularized industrially and has a good application prospect.

Description

A kind of method that improves acrylic plastering thermostability
Technical field
The invention belongs to the physically modified field of polypropylene fibre, particularly a kind of method that improves acrylic plastering thermostability.
Background technology
Polypropylene is a kind of thermoplastic resin being made by propylene polymerization, has isotactic, random and three kinds of configurations of rule, and Industrial products are take isotactic thing as main component.Approximately 174 ℃ of polypropylene fusion temperature, density is about 0.91g/cm 3, be the lightest general-purpose plastics, there is the advantages such as high strength, large, wear-resisting, the resistance to flexural fatigue of hardness, corrosion-resistant, easy machine-shaping, become prevailing material in people's daily life, be again the key issue in business, industry and technical field simultaneously.Xylogen is that nature resultant quantity and amount are only second to cellulosic natural high moleculer eompound.Xylogen forms the main body of plant together with Mierocrystalline cellulose and hemicellulose, is renewable organic resource the abundantest on the earth.Xylogen is the three-dimensional netted macromolecular compound of poly-phenols, and its basic structural unit is phenylpropyl alcohol alkyl structure, total three basic structures (non-condensed structure), i.e. guaiacyl structure, Syringa oblata Lindl. based structures and para hydroxybenzene based structures.Xylogen is a kind of complexity, noncrystalline, three-dimensional netted phenols thermoplastic polyester.There are the problems such as complex structure, physicochemical property heterogeneity, separation and Extraction difficulty and easy condensation simultaneously due to xylogen, it is not utilized so far well.It is mainly present in timber paper-making industrial waste water and agriculture waste, serious pollution environment.But xylogen is a kind of reproducible natural high molecular substance, introduces xylogen or derivative in synthesized polymer material, can not only improve the performance of material, can also reduce costs.
Polymer blending is own to be expected to reduce costs by the xylogen of blend or filling-modified introducing low cost and many activity through becoming the most important most economical method of exploitation superpolymer novel material, and maintenance even improves the performance of material.Xylogen and derivative thereof can with the high molecular polymer blend such as polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), in co-mixing system, xylogen plays a part rigid particles and strengthens, and the performances such as the thermostability to material, flame retardant resistance, photodegradation simultaneously have a certain impact.And this matrix material is having certain advantage aspect dimensional stability, formability, anti-tensile ability and impact resistance.Wood plastic composite (Wood-Plastic Composites, WPC) be the class advanced composite material being in recent years surging forward both at home and abroad, refer to utilize polyethylene, polypropylene and polyvinyl chloride etc., be mixed into new wood materials with useless vegetable fibres such as the xylogen of certain content, wood powder, rice husk, stalks, again through the plastic processings such as extruding, mold pressing, injection molding, the sheet material of producing or section bar.Be mainly used in the industries such as building materials, furniture, logistics packaging.Due to the reinforcement of protection of the environment idea; equivalent material (the not warpage, easy to maintenance of burn into of timber is found in American Architecture industry; outward appearance is similar to timber); Korea S and Japanese papermaking, wood-working factory are the application of finding sawdust, waste wood etc., all promote and accelerated research and the application and development of WPC.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method that improves acrylic plastering thermostability, the method technique is simple, working method is simple, cost is low, and xylogen can play the effect of certain heterogeneous nucleation in crystalling propylene process, improves polyacrylic degree of crystallinity and crystallizing power, while is due to the impact of xylogen tridimensional network, can improve the thermotolerance of matrix material, can be promoted industrial, have a good application prospect.
A kind of method that improves acrylic plastering thermostability of the present invention, comprising:
(1) by xylogen and polypropylene in mass ratio 5:95-20:80 in homogenizer, mix, mixture is carried out in miniature blend instrument at 150-250 ℃ to melt blending, the blend that obtains mixing;
(2) above-mentioned blend is joined to melting at 170-240 ℃ in the hopper of miniature injection machine, the mixture melt obtaining is injected in mould to the cooling blend batten that obtains under injection moulding machine pressure.
Xylogen in described step (1) and polypropylene are dried 24～36h at vacuum 50-90 ℃.
Xylogen in described step (1) is alkali lignin, vitriol xylogen, kraft paper xylogen, acetic acid lignin or enzymolysis xylogen.
Mold shape in described step (2) is dumbbell shaped, strip or disc-shaped.
Die temperature in described step (2) is 20-50 ℃.
The blend batten crystal property obtaining in described step (2) improves, and degree of crystallinity is 50-70%, and in nitrogen, thermostability improves, and in the air of 350 ℃, the residual rate of 1h (12%-16%) is than pure pp(8.98%) significantly improve.
beneficial effect
The present invention is that raw material forms xylogen/polypropylene composite material and improves polyacrylic thermostability by adding the xylogen of biomass, owing to containing a large amount of phenylpropyl alcohol alkyl structures in lignin molecule skeleton, there is better consistency with polypropylene, xylogen can be disperseed more equably on polypropylene matrix.Technique of the present invention is simple, working method is simple, cost is low, xylogen can play the effect of certain heterogeneous nucleation in crystalling propylene process, improve polyacrylic degree of crystallinity and crystallizing power, simultaneously due to the impact of xylogen tridimensional network, can improve the thermotolerance of matrix material, can be promoted industrial, have a good application prospect.
Accompanying drawing explanation
Fig. 1 is pure PP and xylogen/PP mass ratio blend batten infared spectrum while being 10:90;
Fig. 2 is the local surfaces SEM figure of xylogen/PP mass ratio blend batten while being 15:85;
Fig. 3 is the DSC of xylogen/PP mass ratio blend batten while being 10:90;
Fig. 4 is the hot weightless picture in the nitrogen of xylogen/PP mass ratio blend batten and pure pp while being 10:90;
Fig. 5 is the airborne hot weightless picture of xylogen/PP mass ratio blend batten and pure pp while being 15:85.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment are only not used in and limit the scope of the invention for the present invention is described.In addition should be understood that those skilled in the art can make various changes or modifications the present invention after having read the content of the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.
Embodiment 1
By the xylogen powder of vacuum-drying 24h at 70 ℃ and polypropylene in mass ratio 5:95 in homogenizer, mix, mixture is carried out in miniature blend instrument at 180 ℃ to melt blending, the blend that obtains mixing; Above-mentioned blend is joined to melting at 190 ℃ in the hopper of miniature injection machine, under injection moulding machine pressure, mixture melt is injected in dumbbell shaped mould, the Temperature Setting of mould is 30 ℃, the cooling blend batten that obtains dumbbell shaped.Wherein blend batten crystal property improves, and degree of crystallinity is 50%, and in nitrogen, thermostability improves, and in the air of 350 ℃ the residual rate (12.73%) of 1h than pure pp(8.98%) improved 42%.
Embodiment 2
By the xylogen powder of vacuum-drying 24h at 70 ℃ and polypropylene in mass ratio 10:90 in homogenizer, mix, mixture is carried out in miniature blend instrument at 180 ℃ to melt blending, the blend that obtains mixing; Above-mentioned blend is joined to melting at 200 ℃ in the hopper of miniature injection machine, under injection moulding machine pressure, mixture melt is injected in strip mould, the Temperature Setting of mould is 40 ℃, the cooling blend batten that obtains strip.Wherein blend batten crystal property improves, and degree of crystallinity is 54%, and in nitrogen, thermostability improves, and in the air of 350 ℃ the residual rate (14.83%) of 1h than pure pp(8.98%) improved 65%.
Embodiment 3
By the xylogen powder of vacuum-drying 24h at 70 ℃ and polypropylene in mass ratio 15:85 in homogenizer, mix, mixture is carried out in miniature blend instrument at 170 ℃ to melt blending, the blend that obtains mixing; Above-mentioned blend is joined to melting at 200 ℃ in the hopper of miniature injection machine, under injection moulding machine pressure, mixture melt is injected in dumbbell shaped mould, the Temperature Setting of mould is 30 ℃, the cooling blend batten that obtains dumbbell shaped.Wherein blend batten crystal property improves, and degree of crystallinity is 62%, and in nitrogen, thermostability improves, and in the air of 350 ℃ the residual rate (15.47%) of 1h than pure pp(8.98%) improved 72%.
Embodiment 4
By the xylogen powder of vacuum-drying 24h at 70 ℃ and polypropylene in mass ratio 20:80 in homogenizer, mix, mixture is carried out in miniature blend instrument at 190 ℃ to melt blending, the blend that obtains mixing; Above-mentioned blend is joined to melting at 200 ℃ in the hopper of miniature injection machine, under injection moulding machine pressure, mixture melt is injected in disc-shaped mould, the Temperature Setting of mould is 30 ℃, the cooling blend batten that obtains disc-shaped.Wherein blend batten crystal property improves, and degree of crystallinity is 64%, and in nitrogen, thermostability improves, and in the air of 350 ℃ the residual rate (15.82%) of 1h than pure pp(8.98%) improved 76%.

Claims (6)

1. a method that improves acrylic plastering thermostability, comprising:
(1) by xylogen and polypropylene in mass ratio 5:95-20:80 mix, mixture is carried out at 150-250 ℃ to melt blending, the blend that obtains mixing;
(2) above-mentioned blend is joined to melting at 170-240 ℃ in the hopper of miniature injection machine, the mixture melt obtaining is injected in mould to the cooling blend batten that obtains.
2. a kind of method that improves acrylic plastering thermostability according to claim 1, is characterized in that: the xylogen in described step (1) and polypropylene are dried 24～36h at vacuum 50-90 ℃.
3. a kind of method that improves acrylic plastering thermostability according to claim 1, is characterized in that: the xylogen in described step (1) is alkali lignin, vitriol xylogen, kraft paper xylogen, acetic acid lignin or enzymolysis xylogen.
4. a kind of method that improves acrylic plastering thermostability according to claim 1, is characterized in that: the mold shape in described step (2) is dumbbell shaped, strip or disc-shaped.
5. a kind of method that improves acrylic plastering thermostability according to claim 1, is characterized in that: the die temperature in described step (2) is 20-50 ℃.
6. a kind of method that improves acrylic plastering thermostability according to claim 1, is characterized in that: the blend batten degree of crystallinity obtaining in described step (2) is 50-70%.
CN201410014562.1A 2014-01-13 2014-01-13 Method for improving heat stability of polypropylene plastic Pending CN103788485A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104072840A (en) * 2014-06-27 2014-10-01 郑州大学 Method for improving degree of crystallinity of thermoplastic resin micro-molded product
CN109294073A (en) * 2018-09-11 2019-02-01 联塑科技发展(贵阳)有限公司 A kind of ageing-resistant PPR pipe and preparation method thereof
CN109608895A (en) * 2018-12-12 2019-04-12 湖南绿燊环保科技有限公司 Thermoplastic lignin material and preparation method thereof

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
MAURIZIO CANETTI, 等: "Thermal degradation behaviour of isotactic polypropylene blended with lignin", 《POLYMER DEGRADATION AND STABILITY》 *
MAURIZIO CANETTI，等: "Morphology, Crystallization and Melting Properties of Isotactic Polypropylene Blended with Lignin", 《JOURNAL OF APPLIED POLYMER SCIENCE》 *
YOUMING YU，等: "Functionalized lignin by grafting phosphorus-nitrogen improves the thermal stability and flame retardancy of polypropylene", 《POLYMER DEGRADATION AND STABILITY》 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104072840A (en) * 2014-06-27 2014-10-01 郑州大学 Method for improving degree of crystallinity of thermoplastic resin micro-molded product
CN104072840B (en) * 2014-06-27 2016-03-30 郑州大学 A kind of method improving thermoplastic resin micro shaping goods degree of crystallinity
CN109294073A (en) * 2018-09-11 2019-02-01 联塑科技发展(贵阳)有限公司 A kind of ageing-resistant PPR pipe and preparation method thereof
CN109608895A (en) * 2018-12-12 2019-04-12 湖南绿燊环保科技有限公司 Thermoplastic lignin material and preparation method thereof

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Application publication date: 20140514