CN115011089B - Polyglycolic acid composition and thin-wall injection molding cutlery box prepared from same - Google Patents
Polyglycolic acid composition and thin-wall injection molding cutlery box prepared from same Download PDFInfo
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- CN115011089B CN115011089B CN202210575266.3A CN202210575266A CN115011089B CN 115011089 B CN115011089 B CN 115011089B CN 202210575266 A CN202210575266 A CN 202210575266A CN 115011089 B CN115011089 B CN 115011089B
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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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- A—HUMAN NECESSITIES
- A45—HAND OR TRAVELLING ARTICLES
- A45C—PURSES; LUGGAGE; HAND CARRIED BAGS
- A45C11/00—Receptacles for purposes not provided for in groups A45C1/00-A45C9/00
- A45C11/20—Lunch or picnic boxes or the like
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Disclosed are polyglycolic acid compositions, articles made therefrom, and methods of making the same. The polyglycolic acid composition comprises the following components in parts by mass: 100 parts of polyglycolic acid PGA;5-25 parts of a compound material; 2-20 parts of filling reinforcing agent; 0.5-6 parts of nucleating agent; and 1-15 parts of temperature-resistant regulator, wherein the nucleating agent is prepared from nano silicon dioxide, sodium benzoate and ethylene bis stearamide with the mass ratio of 0.3-3:0.1-1:0.1-1 as raw materials, and the temperature-resistant regulator is prepared from montmorillonite, aluminum dihydrogen phosphate and surfactant with the mass ratio of 7-10:0.7-1:0.1-0.2 as raw materials. Articles prepared from the composition have better temperature resistance and strength without additional in-mold heat treatment. Thin-walled articles of 0.6mm thickness made from the composition are able to withstand hot water below 95 ℃.
Description
Technical Field
The invention relates to the technical field of degradation materials. More particularly, to a polyglycolic acid composition, articles made therefrom (e.g., thin-walled injection molded cutlery boxes), and methods of making the same.
Background
Polyglycolic acid (PGA) is an aliphatic polyester-based polymer material having a minimum number of carbon atoms, a completely decomposable ester structure, and a highest decomposition rate, and is a world-recognized material for protecting the global environment and life. PGA as a material is gradually degraded after a certain period of use and eventually becomes water and carbon dioxide harmless to the human body, animals, plants and natural environment. PGA has attracted extensive attention and research due to its good biocompatibility, easy hydrolyzability, high gas barrier property, and excellent mechanical properties.
PGA resins have excellent mechanical strength and mechanical modulus, but have poor toughness, low crystallization rate, poor heat resistance, and the PGA is still in a softened state at a temperature higher than the glass transition temperature. At present, PGA products are prepared by increasing the crystallinity of PGA by in-mold heat treatment, thereby increasing the heat resistance of the products, but the PGA products have problems of long molding cycle, poor circularity, low production efficiency, etc. due to slow crystallization speed.
In order to solve the performance and processing problems of the PGA products, the present invention provides a polyglycolic acid composition, products prepared by using the composition and a preparation method thereof.
Disclosure of Invention
The PGA melt has the problems of high viscosity, high melting point, sensitivity to water and oxygen at high temperature, easiness in degradation, narrow processing temperature range and the like, so that the hot forming processing of the PGA is difficult. In addition, the crystallization rate of PGA is slow, and PGA products in the related art have been improved in heat resistance by increasing the crystallinity of PGA by in-mold heat treatment.
It is an object of the present invention to provide a polyglycolic acid composition. Articles prepared from the polyglycolic acid compositions according to the present invention also have good temperature resistance and strength without additional in-mold heat treatment. Thin-walled articles of 0.4-0.8mm thickness made from the polyglycolic acid composition are capable of withstanding hot water below 95 ℃.
It is an object of the present invention to provide an article prepared using the polyglycolic acid composition according to the present invention.
It is another object of the present invention to provide a method of making the article.
In order to achieve the above purpose, the invention adopts the following technical scheme:
according to one aspect, the invention provides a polyglycolic acid composition, which comprises the following components in parts by mass:
100 parts of polyglycolic acid PGA;
5-25 parts of a compound material;
2-20 parts of filling reinforcing agent;
0.5 to 6 parts, preferably 1.5 to 5 parts, of a nucleating agent; and
1 to 10 parts, preferably 4 to 10 parts, of a temperature-resistant regulator,
the nucleating agent is prepared from nano silicon dioxide, sodium benzoate and ethylene bis stearamide with the mass ratio of 0.3-3:0.1-1:0.1-1 as raw materials,
the temperature-resistant regulator is prepared from montmorillonite, aluminum dihydrogen phosphate and a surfactant in a mass ratio of 7-10:0.7-1:0.1-0.2.
Preferably, the polyglycolic acid PGA has a crystallinity of 60 to 80%, a melting point of 220 to 240℃and a number average molecular weight of 80000 to 125000.
Preferably, the compound material is a mixture of one or more selected from PBAT (polybutylene terephthalate), PBS (polybutylene succinate), PLA (polylactic acid) and PHA (polyhydroxyalkanoate).
Preferably, the filling reinforcing agent is one or a mixture of more than one selected from calcium carbonate, talcum powder, barium sulfate, mica powder, kaolin, wollastonite, zeolite powder and diatomite, and the particle size is 10-15 mu m.
Preferably, the nucleating agent is prepared by the following method:
uniformly mixing nano silicon dioxide and ethylene bis stearamide to obtain mixed powder;
preparing aqueous solution from sodium benzoate and water according to the mass ratio of 1:5-10;
adding the mixed powder into sodium benzoate water solution, and stirring at 50-80deg.C to obtain slurry;
and drying, crushing and sieving the slurry with a 400-mesh sieve to obtain the nucleating agent.
Preferably, the temperature-resistant regulator is prepared by the steps of:
calcining montmorillonite at 700-800 deg.C for 1-2 hr, naturally cooling, and sieving with 400 mesh sieve to obtain calcined montmorillonite powder;
adding aluminum dihydrogen phosphate into deionized water, and stirring uniformly to prepare an aqueous solution with the mass fraction of 5-10%;
adding a surfactant into the aluminum dihydrogen phosphate aqueous solution, and stirring at 1000-3000rpm to obtain an activated aluminum dihydrogen phosphate aqueous solution;
adding calcined montmorillonite powder into activated aluminum dihydrogen phosphate aqueous solution, stirring at 50-70deg.C for 2-4 hr, and stirring at 80-95deg.C until water is dry to obtain temperature-resistant mud;
and (3) placing the temperature-resistant mud into a blast oven at 80-95 ℃ for drying, and then crushing and sieving the temperature-resistant mud with a 400-mesh sieve to obtain the temperature-resistant regulator.
Preferably, the surfactant is a mixture of one or more selected from the group consisting of glyceryl monostearate, glyceryl monolaurate and glyceryl monooleate.
According to another aspect, the present invention provides an article prepared from the polyglycolic acid composition.
Preferably, the article is an injection molded cutlery box.
Preferably, the wall thickness of the injection-molded cutlery box is 0.4-0.8mm.
According to a further aspect, the present invention provides a process for the preparation of said article comprising the steps of:
mixing the PGA, the compound material, the filling reinforcing agent, the nucleating agent and the temperature-resistant regulator to obtain PGA injection premix;
granulating the PGA injection molding premix at 220-275 ℃ to obtain a PGA thin-wall injection molding modified material; and
and (3) carrying out thin-wall injection molding on the PGA thin-wall injection molding modified material, wherein the injection molding temperature is 250-260 ℃, the injection molding pressure is 250Mpa, the injection molding speed is 10-20mm/s, and the cooling time is 10-30 s.
The invention makes the product prepared by the composition have better strength and temperature resistance even under the condition of thin wall by compounding, toughening, filling and reinforcing the degradable polymer and adding the specific nucleating agent and the temperature resistance regulator.
In particular, the thin-wall cutlery box prepared by the composition of the invention can replace the existing polyolefin disposable cutlery box, has simple process, can be produced in batch, is green and environment-friendly, and meets the national environmental requirements for solving the white pollution of disposable plastics.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
Example 1
The polyglycolic acid composition comprises the following components in parts by mass: 100 parts of polyglycolic acid PGA, 5 parts of PBAT, 2 parts of calcium carbonate, 5 parts of nucleating agent and 10 parts of temperature-resistant regulator.
Wherein the polyglycolic acid PGA has a crystallinity of 60% and a melting point of 220℃and a number average molecular weight of 80000.
Wherein the particle size of the calcium carbonate is 10 μm.
The nucleating agent is prepared from nano silicon dioxide, sodium benzoate and ethylene bis stearamide in a mass ratio of 3:1:1 as raw materials, and the preparation method comprises the following steps: uniformly mixing nano silicon dioxide and ethylene bis stearamide to obtain mixed powder; preparing aqueous solution from sodium benzoate and water according to the mass ratio of 1:10; adding the mixed powder into sodium benzoate water solution, and stirring for 5 hours at 3000rpm at 50 ℃ to obtain slurry; and drying, crushing and sieving the slurry with a 400-mesh sieve to obtain the nucleating agent.
Wherein, the temperature-resistant regulator is prepared from montmorillonite, aluminum dihydrogen phosphate and glyceryl monostearate with the mass ratio of 10:1:0.2 as raw materials, and the preparation method comprises the following steps: calcining montmorillonite at 700 deg.C for 2 hr, naturally cooling, and sieving with 400 mesh sieve to obtain calcined montmorillonite powder; adding aluminum dihydrogen phosphate into deionized water, and stirring uniformly to prepare an aqueous solution with the mass fraction of 5%; adding glyceryl monostearate into the aluminum dihydrogen phosphate aqueous solution, and stirring at 1000rpm for 20min to obtain activated aluminum dihydrogen phosphate aqueous solution; adding calcined montmorillonite powder into activated aluminum dihydrogen phosphate aqueous solution, stirring at 50deg.C and 1000rpm for 4 hr, and stirring at 95deg.C and 1500rpm until water is dry to obtain temperature-resistant mud; and (3) placing the temperature-resistant mud into a blast oven at 95 ℃ for drying, and then crushing and sieving the temperature-resistant mud with a 400-mesh sieve to obtain the temperature-resistant regulator.
The size of the prepared injection molding cutlery box 1# is as follows: the wall thickness is 0.6mm, the height is 8.5cm, the diameter of the bottom of the cutlery box is 10cm, the diameter of the opening of the cutlery box is 15cm, and the preparation method comprises the following steps: mixing PGA, PBAT, calcium carbonate, nucleating agent and temperature-resistant regulator, stirring at 50rpm for 8min, and stirring at 1350rpm for 15min to obtain PGA injection premix; granulating the PGA injection molding premix at 220 ℃ to obtain a PGA thin-wall injection molding modified material; and (3) carrying out thin-wall injection molding on the PGA thin-wall injection molding modified material, wherein the injection molding temperature is 250 ℃, the injection molding pressure is 250Mpa, the injection molding speed is 20mm/s, the back pressure is 4.5Mpa, the pressure maintaining time is 0.3s, and the cooling time is 15s, so that the thin-wall injection molding cutlery box 1#.
Example 2
The polyglycolic acid composition comprises the following components in parts by mass: 100 parts of polyglycolic acid PGA, 15 parts of PBS, 10 parts of talcum powder, 3 parts of nucleating agent and 7 parts of temperature resistant regulator.
Wherein the polyglycolic acid PGA has a crystallinity of 70%, a melting point of 230 ℃ and a number average molecular weight of 100000.
Wherein the particle size of the talcum powder is 15 μm.
The nucleating agent is prepared from nano silicon dioxide, sodium benzoate and ethylene bis stearamide with the mass ratio of 2:0.8:0.8 as raw materials, and the preparation method comprises the following steps: uniformly mixing nano silicon dioxide and ethylene bis stearamide to obtain mixed powder; preparing aqueous solution from sodium benzoate and water according to the mass ratio of 1:7; adding the mixed powder into sodium benzoate water solution, and stirring at 2000rpm for 4 hours at 700 ℃ to obtain slurry; and drying, crushing and sieving the slurry with a 400-mesh sieve to obtain the nucleating agent.
Wherein, the temperature-resistant regulator is prepared from montmorillonite, aluminum dihydrogen phosphate and glycerol monooleate with the mass ratio of 7:0.7:0.13 as raw materials, and the preparation method comprises the following steps: calcining montmorillonite at 800 deg.C for 1 hr, naturally cooling, and sieving with 400 mesh sieve to obtain calcined montmorillonite powder; adding aluminum dihydrogen phosphate into deionized water, and uniformly stirring to prepare an aqueous solution with the mass fraction of 7%; adding glycerol monooleate into the aluminum dihydrogen phosphate aqueous solution, and stirring at 2000rpm for 15min to obtain an activated aluminum dihydrogen phosphate aqueous solution; adding calcined montmorillonite powder into activated aluminum dihydrogen phosphate aqueous solution, stirring at 60deg.C and 800rpm for 3 hr, and stirring at 90deg.C and 2000rpm until water is dry to obtain temperature-resistant mud; and (3) placing the temperature-resistant mud into a blast oven at 90 ℃ for drying, and then crushing and sieving the temperature-resistant mud with a 400-mesh sieve to obtain the temperature-resistant regulator.
The injection molded cutlery box 2# prepared using the polyglycolic acid composition described above had the following dimensions: the wall thickness is 0.6mm, the height is 8.5cm, the diameter of the bottom of the cutlery box is 10cm, the diameter of the opening of the cutlery box is 15cm, and the preparation method comprises the following steps: mixing PGA, PBS, talcum powder, nucleating agent and temperature-resistant regulator, stirring for 7min at 70rpm, and stirring for 18min at 1300rpm to obtain PGA injection premix; granulating the PGA injection molding premix at 250 ℃ to obtain a PGA thin-wall injection molding modified material; and (3) carrying out thin-wall injection molding on the PGA thin-wall injection molding modified material, wherein the injection molding temperature is 260 ℃, the injection molding pressure is 250Mpa, the injection molding speed is 20mm/s, the back pressure is 4.5Mpa, the pressure maintaining time is 0.3s, and the cooling time is 15s, so as to obtain the injection molding cutlery box No. 2.
Example 3
The polyglycolic acid group composition comprises the following components in parts by mass: 100 parts of polyglycolic acid PGA, 25 parts of PBS, 20 parts of talcum powder, 2 parts of nucleating agent and 10 parts of temperature resistant regulator.
Wherein the polyglycolic acid PGA has a crystallinity of 80% and a melting point of 240℃and a number average molecular weight of 125000.
Wherein the particle size of the talcum powder is 10 μm.
The nucleating agent is prepared from nano silicon dioxide, sodium benzoate and ethylene bis stearamide with the mass ratio of 0.6:0.2:0.2 as raw materials, and the preparation method comprises the following steps: uniformly mixing nano silicon dioxide and ethylene bis stearamide to obtain mixed powder; preparing aqueous solution from sodium benzoate and water according to the mass ratio of 1:5; adding the mixed powder into sodium benzoate water solution, and stirring at 1000rpm for 3h at 80 ℃ to obtain slurry; and drying, crushing and sieving the slurry with a 400-mesh sieve to obtain the nucleating agent.
Wherein, the temperature-resistant regulator is prepared from montmorillonite, aluminum dihydrogen phosphate and glycerol monolaurate with the mass ratio of 7:0.7:0.1 as raw materials, and the preparation method comprises the following steps: calcining montmorillonite at 800 deg.C for 1 hr, naturally cooling, and sieving with 400 mesh sieve to obtain calcined montmorillonite powder; adding aluminum dihydrogen phosphate into deionized water, and uniformly stirring to prepare an aqueous solution with the mass fraction of 10%; adding glycerol monolaurate into the aluminum dihydrogen phosphate aqueous solution, and stirring for 10min at 3000rpm to obtain an activated aluminum dihydrogen phosphate aqueous solution; adding calcined montmorillonite powder into activated aluminum dihydrogen phosphate aqueous solution, stirring at 70deg.C and 1000rpm for 2 hr, and stirring at 95deg.C and 1500rpm until water is dry to obtain temperature-resistant mud; and (3) placing the temperature-resistant mud into a blast oven at 95 ℃ for drying, and then crushing and sieving the temperature-resistant mud with a 400-mesh sieve to obtain the temperature-resistant regulator.
The injection molded cutlery box 3# prepared using the polyglycolic acid composition described above had the following dimensions: the wall thickness is 0.6mm, the height is 8.5cm, the diameter of the bottom of the cutlery box is 10cm, the diameter of the opening of the cutlery box is 15cm, and the preparation method comprises the following steps: mixing PGA, PBS, talcum powder, nucleating agent and temperature-resistant regulator, stirring for 6min at 90rpm, and stirring for 20min at 1200rpm to obtain PGA injection premix; granulating the PGA injection molding premix at 275 ℃ to obtain a PGA thin-wall injection molding modified material; and (3) carrying out thin-wall injection molding on the PGA thin-wall injection molding modified material, wherein the injection molding temperature is 260 ℃, the injection molding pressure is 250Mpa, the injection molding speed is 20mm/s, the back pressure is 4.5Mpa, the pressure maintaining time is 0.3s, and the cooling time is 15s, so that the thin-wall injection molding cutlery box 3#.
Comparative example 1
The polyglycolic acid composition comprises the following components in parts by mass: 100 parts of polyglycolic acid PGA, 5 parts of PBAT, 2 parts of calcium carbonate and 10 parts of temperature-resistant regulator.
Wherein the polyglycolic acid PGA has a crystallinity of 60% and a melting point of 220℃and a number average molecular weight of 80000.
Wherein the particle size of the calcium carbonate is 10 μm.
Wherein, the temperature-resistant regulator is prepared from montmorillonite, aluminum dihydrogen phosphate and glyceryl monostearate with the mass ratio of 10:1:0.2 as raw materials, and the preparation method comprises the following steps: calcining montmorillonite at 700 deg.C for 2 hr, naturally cooling, and sieving with 400 mesh sieve to obtain calcined montmorillonite powder; adding aluminum dihydrogen phosphate into deionized water, and stirring uniformly to prepare an aqueous solution with the mass fraction of 5%; adding glyceryl monostearate into the aluminum dihydrogen phosphate aqueous solution, and stirring at 1000-rpm for 20min to obtain activated aluminum dihydrogen phosphate aqueous solution; adding calcined montmorillonite powder into activated aluminum dihydrogen phosphate aqueous solution, stirring at 50deg.C and 1000rpm for 4 hr, and stirring at 95deg.C and 1500rpm until water is dry to obtain temperature-resistant mud; and (3) placing the temperature-resistant mud into a blast oven at 95 ℃ for drying, and then crushing and sieving the temperature-resistant mud with a 400-mesh sieve to obtain the temperature-resistant regulator.
The injection molded cutlery box 4# prepared using the polyglycolic acid composition described above had dimensions of: the wall thickness is 0.6mm, the height is 8.5cm, the diameter of the bottom of the cutlery box is 10cm, the diameter of the opening of the cutlery box is 15cm, and the preparation method comprises the following steps: mixing PGA, PBAT, calcium carbonate, nucleating agent and temperature-resistant regulator, stirring at 50rpm for 8min, and stirring at 1350rpm for 15min to obtain PGA injection premix; granulating the PGA injection molding premix at 220 ℃ to obtain a PGA thin-wall injection molding modified material; and (3) carrying out thin-wall injection molding on the PGA thin-wall injection molding modified material, wherein the injection molding temperature is 250 ℃, the injection molding pressure is 250Mpa, the injection molding speed is 20mm/s, the back pressure is 4.5Mpa, the pressure maintaining time is 0.3s, and the cooling time is 15s, so as to obtain the injection molding cutlery box No. 4.
Comparative example 2
The polyglycolic acid composition comprises the following components in parts by mass: 100 parts of polyglycolic acid PGA, 25 parts of PBS, 20 parts of talcum powder and 2 parts of nucleating agent.
Wherein the polyglycolic acid PGA has a crystallinity of 80% and a melting point of 240℃and a number average molecular weight of 125000.
Wherein the particle size of the talcum powder is 10 μm.
The nucleating agent is prepared from nano silicon dioxide, sodium benzoate and ethylene bis stearamide with the mass ratio of 0.6:0.2:0.2 as raw materials, and the preparation method comprises the following steps: uniformly mixing nano silicon dioxide and ethylene bis stearamide to obtain mixed powder; preparing aqueous solution from sodium benzoate and water according to the mass ratio of 1:5; adding the mixed powder into sodium benzoate water solution, and stirring at 1000rpm for 3h at 80 ℃ to obtain slurry; and drying, crushing and sieving the slurry with a 400-mesh sieve to obtain the nucleating agent.
The dimensions of the Wen Baobi-resistant injection molded cutlery box 5# prepared using the polyglycolic acid composition described above were: the wall thickness is 0.6mm, the height is 8.5cm, the diameter of the bottom of the cutlery box is 10cm, the diameter of the opening of the cutlery box is 15cm, and the preparation method comprises the following steps: mixing PGA, PBS, talcum powder, nucleating agent and temperature-resistant regulator, stirring for 6min at 90rpm, and stirring for 20min at 1200rpm to obtain PGA injection premix; granulating the PGA injection molding premix at 275 ℃ to obtain a PGA thin-wall injection molding modified material; and (3) carrying out thin-wall injection molding on the PGA thin-wall injection molding modified material, wherein the injection molding temperature is 260 ℃, the injection molding pressure is 250Mpa, the injection molding speed is 20mm/s, the back pressure is 4.5Mpa, the pressure maintaining time is 0.3s, and the cooling time is 15s, so as to obtain the injection molding cutlery box No. 5.
The above injection molded cutlery boxes 1-5# were tested for performance as shown in table 1 below. As can be seen from the data in table 1, the use of the nucleating agent increases the strength of the injection molded cutlery box, and the cutlery box strength increases with the amount of the nucleating agent; the use of the temperature-resistant regulator can effectively improve the temperature resistance of the cutlery box, and the temperature resistance of the cutlery box is improved along with the increase of the temperature-resistant regulator.
TABLE 1 Polyglycollic acid based Wen Baobi injection molded cutlery box 1-5# Performance
| 95 ℃ hot water temperature resistance | 3Kg load | Drop of 0.8m | |
| Example 1 (1 #) | Qualified product | Qualified product | Qualified product |
| Example 2 (2 #) | Qualified product | Qualified product | Qualified product |
| Example 3 (3 #) | Qualified product | Qualified product | Qualified product |
| Comparative example 1 (4 #) | Qualified product | Failure, height reduction of 12% | Disqualification and bottom cracking |
| Comparative example 2 (5 #) | Failure, deformation of the bottom | Qualified product | Qualified product |
It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (10)
1. A polyglycolic acid composition comprising the following components in parts by mass:
100 parts of polyglycolic acid PGA;
5-25 parts of a compound material;
2-20 parts of filling reinforcing agent;
0.5-6 parts of nucleating agent; and
1-15 parts of temperature-resistant regulator,
the nucleating agent is prepared from nano silicon dioxide, sodium benzoate and ethylene bis stearamide with the mass ratio of 0.3-3:0.1-1:0.1-1 as raw materials,
the temperature-resistant regulator is prepared from montmorillonite, aluminum dihydrogen phosphate and a surfactant in a mass ratio of 7-10:0.7-1:0.1-0.2,
the compound material is a mixture of one or more selected from polybutylene terephthalate-adipate, polybutylene succinate, polylactic acid and polyhydroxyalkanoate;
the nucleating agent is prepared by the following method:
uniformly mixing nano silicon dioxide and ethylene bis stearamide to obtain mixed powder;
preparing aqueous solution from sodium benzoate and water according to the mass ratio of 1:5-10;
adding the mixed powder into sodium benzoate water solution, and stirring at 50-80deg.C to obtain slurry;
drying, crushing and sieving the slurry with a 400-mesh sieve to obtain a nucleating agent; and
the temperature-resistant regulator is prepared through the following steps:
calcining montmorillonite at 700-800 deg.C for 1-2 hr, naturally cooling, and sieving with 400 mesh sieve to obtain calcined montmorillonite powder;
adding aluminum dihydrogen phosphate into deionized water, and stirring uniformly to prepare an aqueous solution with the mass fraction of 5-10%;
adding a surfactant into the aluminum dihydrogen phosphate aqueous solution, and stirring to obtain an activated aluminum dihydrogen phosphate aqueous solution;
adding calcined montmorillonite powder into activated aluminum dihydrogen phosphate aqueous solution, stirring at 50-70deg.C for 2-4 hr, and stirring at 80-95deg.C until water is dry to obtain temperature-resistant mud;
and (3) placing the temperature-resistant mud into a blast oven at 80-95 ℃ for drying, and then crushing and sieving the temperature-resistant mud with a 400-mesh sieve to obtain the temperature-resistant regulator.
2. The composition of claim 1, wherein the nucleating agent is present in an amount of 1.5 to 5 parts.
3. The composition according to claim 1, wherein the content of the temperature-resistant modifier is 4 to 10 parts.
4. The composition of claim 1 wherein the polyglycolic acid has a crystallinity of 60-80%, a melting point of 220-240 ℃, and a number average molecular weight of 80000-125000.
5. The composition of claim 1, wherein,
the filling reinforcing agent is one or more of calcium carbonate, talcum powder, barium sulfate, mica powder, kaolin, wollastonite, zeolite powder and diatomite, and the particle size is 10-15 mu m.
6. The composition of claim 1, wherein,
the surfactant is one or more of glyceryl monostearate, glyceryl monolaurate and glyceryl monooleate.
7. An article prepared using the composition of any one of claims 1 to 6.
8. The article of claim 7, wherein the article is an injection molded cutlery box.
9. The article of claim 8, the injection molded cutlery box having a wall thickness of 0.4-0.8mm.
10. A method of making the article of any one of claims 7 to 9, comprising the steps of:
mixing the PGA, the compound material, the filling reinforcing agent, the nucleating agent and the temperature-resistant regulator to obtain PGA injection premix;
granulating the PGA injection molding premix at 220-275 ℃ to obtain a PGA thin-wall injection molding modified material; and
and (3) carrying out thin-wall injection molding on the PGA thin-wall injection molding modified material, wherein the injection molding temperature is 250-260 ℃, the injection molding pressure is 250MPa, the injection molding speed is 10-20mm/s, and the cooling time is 10-30 s.
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| CN107236393A (en) * | 2017-07-26 | 2017-10-10 | 合肥铭佑高温技术有限公司 | A kind of fire resistant coating and preparation method thereof |
| CN111154245A (en) * | 2020-01-23 | 2020-05-15 | 中科信晖(海南)新材料科技有限公司 | Fully-biodegradable dental floss rod handle and preparation method thereof |
| CN112724623A (en) * | 2020-12-24 | 2021-04-30 | 海南赛高新材料有限公司 | High-heat-resistance modified PGA material and preparation method thereof |
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| CA2891366C (en) * | 2012-10-11 | 2017-05-02 | Kureha Corporation | Polyglycolic acid resin composition and method for producing the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107236393A (en) * | 2017-07-26 | 2017-10-10 | 合肥铭佑高温技术有限公司 | A kind of fire resistant coating and preparation method thereof |
| CN111154245A (en) * | 2020-01-23 | 2020-05-15 | 中科信晖(海南)新材料科技有限公司 | Fully-biodegradable dental floss rod handle and preparation method thereof |
| CN112724623A (en) * | 2020-12-24 | 2021-04-30 | 海南赛高新材料有限公司 | High-heat-resistance modified PGA material and preparation method thereof |
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