KR20170070312A - Injection-molded article molded by waste phenolic resin and methods of making same - Google Patents
Injection-molded article molded by waste phenolic resin and methods of making same Download PDFInfo
- Publication number
- KR20170070312A KR20170070312A KR1020150176796A KR20150176796A KR20170070312A KR 20170070312 A KR20170070312 A KR 20170070312A KR 1020150176796 A KR1020150176796 A KR 1020150176796A KR 20150176796 A KR20150176796 A KR 20150176796A KR 20170070312 A KR20170070312 A KR 20170070312A
- Authority
- KR
- South Korea
- Prior art keywords
- resin
- phenolic resin
- thermosetting resin
- silane
- discarded
- Prior art date
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/04—Condensation polymers of aldehydes or ketones with phenols only
- C08L61/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2555/00—Characteristics of bituminous mixtures
- C08L2555/30—Environmental or health characteristics, e.g. energy consumption, recycling or safety issues
- C08L2555/34—Recycled or waste materials, e.g. reclaimed bitumen, asphalt, roads or pathways, recycled roof coverings or shingles, recycled aggregate, recycled tires, crumb rubber, glass or cullet, fly or fuel ash, or slag
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The present invention relates to a polymer composite comprising a phenolic resin and an olefinic polymer, a method for producing the same, and a polymer composite including a silane pretreated phenol resin, and a method for producing the same. Liner / runner, and provides a composite excellent in thermal stability and mechanical properties. The present invention also provides an effect of solving environmental problems as well as cost reduction by reusing the entirely discarded phenol resin.
Description
The present invention relates to a polymer composite material including a sprue / runner and an olefin-based polymer generated during phenol resin molding, and a method for producing the same.
Recycling of waste plastics has recently become important from the viewpoint of resource conservation. Except for the recycling of some wastes, waste plastics are mostly disposed of by incineration or landfill. However, considering the trend of increasing amount of waste plastics, And the use of chemical recycling as a source of energy through gasification or the like.
Phenol resin is a typical thermosetting resin and has excellent heat resistance and mechanical properties and is used as an essential material in the automobile and electric industry.
However, recycling is difficult due to the thermosetting property, and 15-20% of the total production is discarded in the manufacturing process, such as sprue / runner. It is estimated that only 14,000 tons of spruce / runner will be discarded in Korea, and the treatment cost will reach 20 billion won annually.
On the other hand, Patent Document 1 discloses a method of recycling a synthetic resin foam, which is recycled from a synthetic resin foam and which has a higher production cost than a conventional synthetic resin foam, to improve mechanical properties and other physical properties such as flame retardancy, heat resistance, low toxicity, ) Is disclosed to provide an excellent phenol foam composite.
Patent Document 2 discloses providing a phenolic resin molding material excellent in electrical characteristics and mechanical strength by blending a pulverized powder of a sprue / runner discharged at the time of molding a thermosetting resin molding material.
Patent Document 3 discloses a molded carbide formed by carbonizing a composition containing a phenol resin prepolymer as a binder and a phenol resin hardened powder obtained by pulverizing a sprue / runner or a molding defective product generated at the time of molding a phenol resin molding material.
Accordingly, the present inventors collected and pulverized phenol sprue / runners to be discarded in order to solve not only cost reduction through material recycling but also environmental problems, thereby to provide a polymer composite containing an olefin-based polymer, a method for producing the same, To improve the interfacial adhesion between the olefin resin and the olefin resin, the present inventors have completed the present invention by providing a method of pre-treating the phenolic resin powder with two kinds of silanes.
Accordingly, the present invention provides a polymer composite material containing waste phenol sprue / runner pulverized material and olefin polymer, and a method for producing the same, a polymer composite including a phenol resin and a polymer treated with silane, and a process for producing the same The purpose.
As a means for solving the above problems, the present invention provides a polymer composite material comprising a phenolic resin powder and an olefin-based polymer to be discarded.
Further, as another means for solving the above problems, the present invention provides a method for producing a polymer composite material in which crude pulverized phenol and non-pulverized phenol are mixed with an olefin-based polymer.
As another means for solving the above problems, the present invention provides a polymer composite material comprising a phenol powder and an olefin-based polymer pretreated with silane.
Further, as another means for solving the above problems,
Subjecting the novolak phenolic resin powder to be discarded to primary pulverization and secondary pulverization through nitrogen cooling;
And mixing the pulverized material and the olefin-based polymer by a melt-blending method.
Further, as another means for solving the above problems,
Treating the mixed solvent of distilled water / ethanol with an acid to adjust pH to promote hydrolysis;
Adding a vinyl / acryl silane as a silane coupling agent to the mixed solvent;
Hydrolyzing alkoxysilane with silanol with stirring at 40 占 폚 for 30 minutes;
Adding and pulverizing the pulverized phenol powder to the hydrolyzate;
Stirring the resultant mixture under reduced pressure, and drying the filtered powder to obtain a silane pretreated phenol resin.
As another means for solving the above problems, the present invention provides a polymer composite material comprising an olefin-based polymer as a silane pretreated phenolic resin and a thermoplastic resin.
Further, as another means for solving the above problems, the present invention provides a method of recycling a sprue / runner that occurs during phenol resin molding.
The present invention provides a polymer composite comprising a phenolic resin and an olefin-based polymer to be discarded. The composite has a tensile strength and a flexural modulus that are increased, thereby facilitating crushing and excellent impact strength. Also, the polymer composite containing the pulverized phenolic resin prepreg treated with silane and the olefin based polymer is excellent in heat resistance and mechanical properties.
Further, the present invention can solve the problems of cost reduction, resource recycling, and environmental problems by recycling the conventionally discarded phenol sprue / runner.
FIG. 1 is a graph showing changes in mechanical properties depending on the particle size of a) 113 μm, b) 300 μm, and c) 450 μm pulverized phenolic resin powders.
2 is a graph showing the flexural modulus according to the particle size of the phenolic resin powder.
3 is a graph showing the impact strength according to the particle size of the phenolic resin powder.
Fig. 4 is a graph showing the thermal characteristics of a molded article of phenol resin powder / PE pretreated with silane.
FIG. 5 is a graph showing the crystallization characteristics shown by combining eq., Which is a combination of Avrami eq. And Ozawa eq. When acrylic silane and vinyl silane are used.
6 is a graph showing the results of heat resistance measurement by HDT (Heat Distortion Temperature) test of a composite material.
7 is a graph showing the mechanical properties of the silane pretreated phenolic resin powder.
Hereinafter, the present invention will be described in detail.
As a result of intensive studies, the present inventors have found that a polymer composite produced by pulverizing the discarded phenolic resin powder according to the particle size and blending it with polyethylene, which is an olefinic polymer, has excellent thermal and mechanical properties, And has reached the completion of the invention.
The present invention provides a polymer composite material containing a thermosetting resin and a thermoplastic resin to be discarded, and a method for producing the same.
The thermosetting resin may be a phenol resin, and preferably recycles the sprue / runner generated during phenol resin molding.
The thermoplastic resin may be an olefin-based polymer, and preferably polyethylene (PE).
The present invention relates to a method for producing a polymer composite material comprising a thermosetting resin and a thermoplastic resin to be discarded,
Subjecting the thermosetting resin to be discarded to primary pulverization and secondary pulverization through nitrogen cooling;
And mixing the pulverized material and the thermoplastic resin by melt blending.
The thermosetting resin is a phenol resin, and the phenol resin is preferably used by subjecting a novolac sprue / runner discarded in Shinheung Chemical to primary coarse grinding through emergent chemistry, secondary coarse grinding through nitrogen cooling of aprochem .
The pulverization step is carried out regardless of the particle size of the phenolic resin, but it is preferable that the particle size is 300 to 500 mu m, which is most easily pulverized and suitable for composite production.
The thermoplastic resin may be an olefin-based polymer, and preferably polyethylene (PE).
The present invention provides a polymer composite material comprising a silane pretreated thermosetting resin and a thermoplastic resin, and a method for producing the same.
The silane pretreated thermosetting resin is produced as follows.
Adjusting the pH of the distilled water / ethanol mixed solvent to 4 under an acid catalyst;
Adding a vinyl / acryl silane as a silane coupling agent to the mixed solvent;
Hydrolyzing alkoxysilane with silanol with stirring at 40 占 폚 for 30 minutes;
Adding a pulverized thermosetting resin powder to the hydrolyzate and stirring the mixture;
Stirring and filtering under reduced pressure to dry the filtered powder,
The thermosetting resin is characterized by recycling the sprue / runner that occurs during phenol resin molding.
The silane coupling agent can be used for photo-neutralization and thermosetting of phenol resin and polyethylene, and it can particularly play a role of imparting versatility to a phenol resin. As the coupling agent, a silane-based coupling agent may be preferably used. Specifically, 3- (methacryloyloxy) propyltrimethoxysilane or vinyltrimethoxysilane may be used. As the silane coupling agent in the present invention, And may be one or more selected from the group having a substance-based chemical structure.
The thermoplastic resin is an olefin-based polymer, and may preferably be polyethylene (PE).
Acids used in the pH adjustment step are not limited to acids used in the art, and acetic acid is used in the present invention.
The mechanism of the above production reaction is as follows.
The present invention provides a method for recycling a sprue / runner which is a phenolic resin injection scrap discarded as a thermosetting resin when producing a polymer composite comprising a thermosetting resin and a thermoplastic resin.
The present invention can produce a polymer composite material using a phenolic resin to be discarded, and can be very helpful in terms of cost reduction and recycling of waste plastics. In addition, the polymer composite material of the present invention is advantageous in industrial aspects because of its excellent mechanical and thermal properties. It is possible to solve the environmental problems due to the waste plastics by solving the problems caused by disposal of all the injection scraps generated in the conventional molding of phenol resin through the present invention.
Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the scope of the present invention is not limited by the following examples.
[Example]
Example 1: Preparation of polymer composite material containing phenolic resin powder and polyethylene
Phenol resin powders were used for the first crude milling through the emerging chemistry and the second milling through the cooling of aprochem nitrogen. The novolac sprue / runner discarded in Shinheung Chemical was used as the polyolefin polymer (PE) was powder of 2210J (MI: 7g / 10min) manufactured by Lotte Chemical Co., Ltd.
Phenolic resin powders with average particle sizes of 113 μm, 300 μm and 450 μm were blended with HDPE /
Example 2: Preparation of a polymer composite containing silane pretreated phenolic resin powder and polyethylene
The coupling agent used for the pretreatment of phenol was 3- [mehacryloyloxy] propyltrimethoxysilane of alfa aesar and vinyltrimethoxysilane of sigma-aldrich.
The pH of the 1: 4 solution of distilled water / ethanol was adjusted to pH 4 using acetic acid, and 1% by weight of vinyl / acryl silane was added to proceed hydrolysis. While stirring at 40 ° C for 30 minutes, the alkoxysilane was reacted with silanol Hydrolysis reaction was carried out. Thereafter, the pulverized phenol resin powder was added and stirred at 40 ° C for 2 hours to stir silanol for 2 hours to absorb silanol on the surface of the phenol resin powder. The mixture was filtered under reduced pressure, and the filtered powder was dried at 120 ° C , And dried for 2 hours to perform condensation polymerization.
In addition, HDPE / silane treated phenol powder composites were prepared with the same composition as in Table 1 for pretreated silane. The equipment used in the manufacture was a BA-19 twin-screw extruder (L / D = 40, 19Φ, co-rotating) from Bautek and was extruded at a barrel temperature of 170 ° C (hopper) . The obtained sample was dried in an oven at 60 ° C for 24 hours, and then subjected to injection molding using an HVM-25VS injector of HEUNG HWA Machinery for mechanical property measurement. Table 1 below shows the Content of PE / phenol composites.
Experimental Example 1: Analysis of Mechanical Properties, Impact Strength and Flexural Strength of Phenolic Resin Powder and Polyethylene-Containing Polymer Composite by Particle Size
In order to analyze the characteristics of the polymer composite according to the particle size of the pulverized phenolic resin, the particle size was analyzed using a Zetasizer Nano ZSP particle size analyzer manufactured by MALVERN. Ethanol was used to disperse the pulverized phenolic resin.
The particle size of the filler used in the present invention is 113 μm, 300 μm and 450 μm, respectively. The average particle size of the pulverization process can be obtained by primary pulverization only through a pulverizer up to 450 μm, and secondary pulverization is carried out using a pulverizer to obtain a particle size of 300 μm or less.
Various theories have been introduced to analyze the change of mechanical properties with increasing particle size. In the case of inorganic fillers such as Talc and clay, the particle size is experimented in the range of several nm ~ 200μm. Improvement in mechanical properties has been reported as the particle size is smaller. However, the average particle size of the phenol powder used in the present invention is 100 to 500 mu m, which is not easy to analyze because the particle size is different. Fiberglass and carbon fiber are another additives used for polymer reinforcement. In the case of staple fibers, 0.1mm ~ 10mm size is used. It is reported that as the fiber length becomes longer, the mechanical properties are reinforced. However, it is expected that fibrous particles will have similar characteristics to those of fiber filler because they have a large aspect ratio and therefore do not exhibit completely the same characteristics, but have a crushed and angular model with a large particle size .
A pull-out model is used as a representative theory to explain impact reinforcement due to particle size increase in fiber-reinforced composite materials. The pull-out model was proposed to explain the energy dissipation of notched composite materials. In order to break a composite material with a large particle size added, the filler must break or the filler must be pulled out of the material. In order to extract the material, share stress occurs in the vertical direction in which the impact energy is transmitted, and the impact energy is dispersed.
The flexural strength was measured using a universal testing machine (UTM, Tinius Olsen, H5KT) according to ASTM D648.
The impact strength was measured using an Izod impact tester (Izod impact tester, QM 700A, Korea) after Izod impact strength specimens manufactured by injection molding in accordance with ASTM D256 were notched with a notching machine.
2, in the present invention, the flexural modulus of the phenolic resin powder is increased regardless of the particle size. In FIG. 3, the impact strength is increased as the particle size is increased.
Since the tensile strength and the flexural modulus are the same regardless of the particle size, the average particle size, which is most easily pulverized and has a high impact strength, is preferably 500 μm or less for the production of a composite material.
Experimental Example 2: Characterization of differential scanning calorimetry (DSC) according to introduction of phenol resin powder
DSC (Perkin elmer, DIAMOND DSC) was used to confirm the nucleating effect and thermal properties of the phenolic resin powder. The DSC was heated from 30 ° C to 180 ° C at a rate of 10 ° C / min and cooled at a rate of 30 ° C / min, 20 ° C / min, 10 ° C / min and 5 ° C / The thermal properties were verified through eq.
In order to confirm the crystallization behavior, the relative crystallinity Xc (T) was obtained from DSC data through the following equation (1).
T 0 is the crystallization starting temperature T ∞ is the temperature at which the crystallization ends. In order to confirm the anisotropic crystallization behavior, the combining formula of Ozawa eq. And Avrami eq. Was used in this experiment. Each Ozawa and Avrami equations are as in (2) and (3), and the combining formula, which is the combining equation, is as shown in (4).
In the combining formula, b is the ratio of Ozawa to Avrami constant, b = n / m, and F (T) is the temperature when the crystallinity is determined.
When the acrylic silane and the vinyl silane were used in the present invention, the crystallization temperature, the relative crystallinity, and the crystallization starting temperature were increased as shown in the data of Table 2, and particularly, when the vinyl silane was used, a better nucleating effect was obtained.
Figure 5 shows that the 80% crystallization time of the silane pretreatment was faster than that of the untreated case, when combined with the combination of Avrami eq. And ozawa eq. [6].
Experimental Example 3: Analysis of heat distortion temperature (HDT) for confirming improvement of heat resistance of poly (ethylene terephthalate) added with phenol resin powder
To verify the heat resistance improvement of PE when phenol resin was added, 303 HDTM thermal deformation temperature meter of Tinus olsen was used.
As a result of measuring the heat resistance of the composite material through an HDT (heat distortion termperature) tester, it was confirmed from FIG. 6 that the HDPE was 77 ° C and the HDT was improved by 13 ° regardless of the type of phenol. It was also confirmed that when vinyl silane was used and the content of silane was 3 wt%, the heat resistance at 20 캜 was improved.
Experimental Example 4: Analysis of mechanical properties of silane pretreated phenol resin powders
The mechanical properties of the silane pretreated phenolic resin powders were examined. As shown in FIG. 7, when the phenol pulverized product without silane pretreatment was compounded with PE, the mechanical properties were reduced except flexural elasticity. Silane treatment was performed to improve the interfacial adhesion between PE and phenol pulverized material, and the improvement of mechanical properties was confirmed. Especially, the improvement of the mechanical properties was confirmed in the case of the vinyl silane indicated by green color. Considering the tensile strength, flexural elasticity and impact strength, the best physical properties were obtained by pretreating with vinyl silane and adding 20 phr of PE.
Claims (14)
Wherein the discarded phenolic resin is a sprue / runner generated during phenol resin molding.
Wherein the olefin-based polymer is polyethylene (PE).
Wherein the phenolic resin has a particle size of 300 to 500 占 퐉 or less.
Subjecting the thermosetting resin powder to primary pulverization and secondary pulverization through nitrogen cooling;
Mixing the pulverized material and the thermoplastic resin by melt blending,
The method of claim 1, wherein the discarded thermosetting resin is a phenol resin, and the thermoplastic resin is an olefin-based polymer.
Wherein the phenolic resin recycles a sprue / runner generated during phenol resin molding, and the olefin-based polymer is polyethylene (PE).
Wherein the pulverized product of the phenolic resin has a particle size of 300 to 500 탆 or less.
Wherein the discarded phenolic resin is recycled to a sprue / runner that occurs during the molding of the phenolic resin.
Wherein the olefin-based polymer is polyethylene (PE).
(ii) adding a vinyl / acryl silane as a silane coupling agent to the mixed solvent;
(iii) hydrolyzing alkoxysilane with silanol with stirring at 40 DEG C for 30 minutes;
(iv) adding and pulverizing the thermosetting resin powder pulverized to the hydrolyzate;
(v) stirring and filtering under reduced pressure to dry the filtered powder,
The method for producing a silane pretreated thermosetting resin according to claim 8, wherein the thermosetting resin recycles a sprue / runner generated in phenol resin molding.
Wherein the silane coupling agent is 3- (methacryloyloxy) propyltrimethoxysilane or vinyltrimethoxysilane. 2. The method of claim 1, wherein the silane coupling agent is 3- (methacryloyloxy) propyltrimethoxysilane or vinyltrimethoxysilane.
Wherein the pH controlling step is performed by adjusting the pH to 4 using acetic acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150176796A KR101883238B1 (en) | 2015-12-11 | 2015-12-11 | Injection-molded article molded by waste phenolic resin and methods of making same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150176796A KR101883238B1 (en) | 2015-12-11 | 2015-12-11 | Injection-molded article molded by waste phenolic resin and methods of making same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20170070312A true KR20170070312A (en) | 2017-06-22 |
| KR101883238B1 KR101883238B1 (en) | 2018-08-01 |
Family
ID=59283187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020150176796A KR101883238B1 (en) | 2015-12-11 | 2015-12-11 | Injection-molded article molded by waste phenolic resin and methods of making same |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR101883238B1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102390520B1 (en) * | 2021-12-31 | 2022-04-27 | 이금영 | Thermosetting Resin Cooling Tower Exterior Recycled Composite Material, the Cooling Tower Exterior Product Manufactured Thereby, and Method for Manufacturing Thereof |
| KR20220053065A (en) * | 2020-10-21 | 2022-04-29 | 김덕규 | High-strength recyclable plastic bag using the waste resources and manufacturing method thereof |
| CN115417958A (en) * | 2022-09-22 | 2022-12-02 | 湖北华航新材料有限公司 | Hydrophobically modified thermosetting phenolic resins, aerogels and aerogel-based composites |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59219367A (en) * | 1983-05-30 | 1984-12-10 | Karupu Kogyo Kk | Composite resin composition |
| JPH07300549A (en) | 1994-05-06 | 1995-11-14 | Sumitomo Bakelite Co Ltd | Phenolic resin molding material |
| JPH0812433A (en) | 1994-06-29 | 1996-01-16 | Sumitomo Bakelite Co Ltd | Formed carbonized material |
| JPH0892432A (en) * | 1994-09-22 | 1996-04-09 | Sumitomo Durez Co Ltd | Phenol resin composition |
| KR20040005035A (en) | 2002-07-08 | 2004-01-16 | (주) 나노텍 | Recycling Phenol Foam Complex |
-
2015
- 2015-12-11 KR KR1020150176796A patent/KR101883238B1/en active IP Right Grant
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59219367A (en) * | 1983-05-30 | 1984-12-10 | Karupu Kogyo Kk | Composite resin composition |
| JPH07300549A (en) | 1994-05-06 | 1995-11-14 | Sumitomo Bakelite Co Ltd | Phenolic resin molding material |
| JPH0812433A (en) | 1994-06-29 | 1996-01-16 | Sumitomo Bakelite Co Ltd | Formed carbonized material |
| JPH0892432A (en) * | 1994-09-22 | 1996-04-09 | Sumitomo Durez Co Ltd | Phenol resin composition |
| KR20040005035A (en) | 2002-07-08 | 2004-01-16 | (주) 나노텍 | Recycling Phenol Foam Complex |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20220053065A (en) * | 2020-10-21 | 2022-04-29 | 김덕규 | High-strength recyclable plastic bag using the waste resources and manufacturing method thereof |
| KR102390520B1 (en) * | 2021-12-31 | 2022-04-27 | 이금영 | Thermosetting Resin Cooling Tower Exterior Recycled Composite Material, the Cooling Tower Exterior Product Manufactured Thereby, and Method for Manufacturing Thereof |
| CN115417958A (en) * | 2022-09-22 | 2022-12-02 | 湖北华航新材料有限公司 | Hydrophobically modified thermosetting phenolic resins, aerogels and aerogel-based composites |
Also Published As
| Publication number | Publication date |
|---|---|
| KR101883238B1 (en) | 2018-08-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102226023B (en) | Composite board based on mixed waste polymers and preparation method thereof | |
| Maldhure et al. | Mechanical properties of polypropylene blended with esterified and alkylated lignin | |
| Fonseca-Valero et al. | Mechanical recycling and composition effects on the properties and structure of hardwood cellulose-reinforced high density polyethylene eco-composites | |
| KR102322498B1 (en) | How to Recycle Scrap or Unused Epoxy Resin Prepreg | |
| KR101883238B1 (en) | Injection-molded article molded by waste phenolic resin and methods of making same | |
| KR101383621B1 (en) | Recycled polypropylene polymer composite materal composition with improved tensile strength and flexural rigidity and manufacturing method thereof | |
| KR101000658B1 (en) | Recycling polyethyleneterephthalate composite and manufacturing method of thereof | |
| Kakroodi et al. | Impact modification of polypropylene‐based composites using surface‐coated waste rubber crumbs | |
| Mohammad et al. | Mechanical, thermal and morphological study of kenaf fiber reinforced rPET/ABS composites | |
| Yildirir et al. | Evaluating the mechanical properties of reinforced LDPE composites made with carbon fibres recovered via solvothermal processing | |
| CN102311616A (en) | Carbon-fiber-reinforced polyester composite material and preparation method thereof | |
| Tan et al. | Preparation and characterization of thermoplastic elastomer of poly (vinyl chloride) and chlorinated waste rubber | |
| KR100973962B1 (en) | Method for reusing crushed synthetic resin product having cured resin incorporated therein | |
| KR20170059175A (en) | Method for manufacturing bioplastic composite using wood flour and bioplastic composite produced by using the same | |
| Dhanania et al. | Phosphorylated cardanol prepolymer grafted guayule natural rubber: an advantageous green natural rubber | |
| Abdelaal et al. | Enhancement of polyolefins compatibility with natural fibers through chemical modification | |
| Zainal et al. | Polypropylene/(waste tire dust)/(short glass fiber composites): Effects of silane coupling agent and dynamic vulcanization | |
| Shen et al. | Enhancing performances of hemp fiber/natural rubber composites via polyhydric hyperbranched polyester | |
| Wattanachai et al. | Open loop recycling of recycled polypropylene for motorcycle saddle application | |
| JP6837590B2 (en) | Manufacturing method of composite plastic material and composite plastic material | |
| Lewis et al. | Design and engineering of sustainable biocomposites from ocean-recycled polypropylene-based polyolefins reinforced with almond shell and hull | |
| Menon et al. | Studies on fly‐ash‐filled natural rubber modified with cardanol derivatives: Processability, mechanical properties, fracture morphology, and thermal decomposition characteristics | |
| Ragunathan et al. | Effect of maleic anhydride‐grafted polypropylene on polypropylene/recycled acrylonitrile butadiene rubber/empty fruit bunch composite | |
| CN112457624A (en) | Modified regenerated ABS (acrylonitrile-butadiene-styrene) nano composite material as well as preparation method and application thereof | |
| Liao et al. | The novel application of asphalt in cross-linked polyethylene composite |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| N231 | Notification of change of applicant | ||
| E902 | Notification of reason for refusal | ||
| E902 | Notification of reason for refusal | ||
| E701 | Decision to grant or registration of patent right | ||
| GRNT | Written decision to grant |