CN112011095A - Naturally degradable corner protector and preparation method thereof - Google Patents
Naturally degradable corner protector and preparation method thereof Download PDFInfo
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- CN112011095A CN112011095A CN202010676950.1A CN202010676950A CN112011095A CN 112011095 A CN112011095 A CN 112011095A CN 202010676950 A CN202010676950 A CN 202010676950A CN 112011095 A CN112011095 A CN 112011095A
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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
- C08L3/00—Compositions of starch, amylose or amylopectin or of their derivatives or degradation products
- C08L3/02—Starch; Degradation products thereof, e.g. dextrin
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/003—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor characterised by the choice of material
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D59/00—Plugs, sleeves, caps, or like rigid or semi-rigid elements for protecting parts of articles or for bundling articles, e.g. protectors for screw-threads, end caps for tubes or for bundling rod-shaped articles
-
- 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
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The invention discloses a naturally degradable angle bead and a preparation method thereof, wherein the angle bead is composed of the following dry materials in parts by weight: 20-40% of starch, 2-4% of stearic acid, 20-30% of pine needle powder and 30-60% of plant fiber and/or waste paper scrap, wherein the mixing ratio of dry materials to hot water is 1: 1.5 to 1.7. The naturally degradable angle bead is prepared by adopting plant environment-friendly raw materials and degradable materials and carrying out biological polymerization and gelatinization reaction at high temperature, and the product is environment-friendly, low in cost, good in structural force and capable of meeting the use requirements of the packaging industry.
Description
Technical Field
The invention relates to the technical field of packaging, in particular to a naturally degradable corner protector and a preparation method thereof.
Background
At present, the angle bead made of paper and plastics is mainly used in the field of packaging, and the existing angle bead made of plastics is difficult to degrade and causes pollution to the environment.
In the existing paper corner protector production process, paper is cut according to the specification of the paper corner protector, the workload is high, the width of cut paper is influenced by equipment and personnel operation skills, and the cutting quality of the cut paper cannot be guaranteed; secondly, the paper needs to be coated with glue, the amount of the coated glue is also influenced by the operation skills of equipment and personnel, and the quality of the coated paper cannot be ensured; thirdly, the paper is bonded layer by using the glue, a large amount of paper and glue are needed in the production process of the paper by utilizing the die for roll forming, the production cost is greatly influenced by the paper making, the cost of the paper making is also high, the pollution caused by the environment for the paper making is also very large, the glue cannot be degraded in the nature, and the use cost is high; fourthly, the forming part is adjusted by a plurality of sets of rollers and can be completed by professional personnel, the forming part is also influenced by equipment and personnel operating skills, the whole production process is greatly influenced by external factors, the cost is high, and the consumed time and the used resources are large to ensure the stable production for a long time.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a naturally degradable corner protector and a preparation method thereof, the corner protector can replace wood, plastic and paper packages or other heavy and environmentally-friendly packaging modes, and has the characteristics of low price, light weight, firmness and no pollution to the environment due to natural degradation.
The purpose of the invention is realized by adopting the following technical scheme:
a preparation method of a naturally degradable corner protector comprises the following steps:
1) respectively crushing the dry materials into powder for later use; wherein the dry material comprises the following raw materials in parts by weight: 20-40% of starch, 2-4% of stearic acid, 20-30% of pine needle powder and/or 30-60% of plant fiber; the mixing ratio of the dry materials to the hot water is 1: 1.5 to 1.7; the temperature of the hot water is 95-100 ℃;
the starch mainly plays roles of pasting, bonding and binding force increasing, and the starch is dissolved in hot water and heated, so that starch granules swell and collapse to form a viscous and uniform paste-soluble substance. The stearic acid has the functions of softening, plasticizing and lubricating and demoulding; under the conditions of high temperature and pressure, the gelatinized starch flows disorderly to form a cementing net structure by the plant fiber and/or the waste paper scraps, so that the bonding force in each direction is enhanced, and the toughness is enhanced; the pine needle powder has the characteristics of mould proofing and moisture proofing, and can play a role in lubricating and demoulding. The dry material source of the invention is environment-friendly and easy to obtain, and the manufactured corner protector can be recycled by 100 percent or naturally degraded in nature.
2) Pouring starch into a mixer, adding a small amount of hot water, and stirring;
3) then pouring the plant fibers and/or the waste paper scraps into a mixer, adding a small amount of hot water and stirring;
4) then continuously pouring the pine needle powder into a mixer, and pouring the rest hot water into the mixer for stirring;
5) finally, pouring stearic acid into a mixer for stirring to obtain a paste solution;
6) pouring the paste solution obtained in the step 5) into a mold, and heating at 150-180 ℃ for 8-15 minutes for molding to obtain the naturally degradable corner protector. The gelatinized starch is enabled to generate disordered flow to form a cementing net structure under the conditions of high temperature and pressure due to the addition of hot water into the paste solution, and then the paste solution is pressed by a shaping mold, so that two end surfaces are smooth and flat, have no obvious burrs and are mutually vertical, or the angle can be changed according to the appearance characteristics of a product;
7) and attaching a layer of craft paper on the surface of the naturally degradable corner protector, so that the appearance of the naturally degradable corner protector is the same as that of the paper corner protector.
Still further, in the step 1), the starch is one or more of corn starch, potato starch, sweet potato starch and tapioca starch.
Further, in the step 1), the plant fiber is one or more of tree branches, reeds, bamboos, cotton and hemp, straws and rice bran; the length of the plant fiber and/or the waste paper scrap is 1-1.5 mm, the diameter is 0.01-0.1 mm, and the size is 30-100 meshes.
A naturally degradable angle bead is prepared by the preparation method.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the technical scheme, the plant environment-friendly raw materials and the degradable materials are adopted, the gelatinized starch flows disorderly at high temperature and under high pressure to form a cementing net structure, and the naturally degradable corner protector is finally manufactured.
(2) The preparation method of the naturally degradable angle bead has simple process, and can realize automation of the whole process from the mixing of materials, automatic material supply, automatic mold production and automatic product output, and can realize large-scale commercial production and sale.
(3) The naturally degradable angle bead does not need to use a large amount of paper and glue, and the forming part does not need to use roller equipment, so that the angle bead can be produced and meets the use requirement without being influenced by the skills of operators.
Detailed Description
The present invention is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.
Example 1
A naturally degradable corner protector comprises the following dry materials in parts by weight:
120g of cassava starch (40 wt%), 12g of stearic acid (4 wt%), 78g of pine needle powder (26 wt%) and 90g of straws (30 wt%), wherein the mixing ratio of dry materials to hot water is 1: 1.7. the temperature of the hot water was 100 ℃ and the amount of the hot water was 510 g. The length of the straw is 1.5mm, the diameter is 0.1mm, and the size is 50 meshes.
The preparation method of the naturally degradable corner protector comprises the following steps:
1) respectively crushing starch, stearic acid, pine needle powder and straws into powder for later use;
2) pouring starch into a mixer, adding a small amount of hot water, and stirring;
3) pouring the straws into a mixer, adding a small amount of hot water, and stirring;
4) then continuously pouring the pine needle powder into a mixer, and pouring the rest hot water into the mixer for stirring;
5) finally, pouring stearic acid into a mixer for stirring to obtain a paste solution;
6) pouring 180g of the paste solution obtained in step 5) into a mold, and heating at 180 ℃ for 8 minutes for molding to obtain a naturally degradable corner protector (L-shaped corner protector) of 50X 5X 300 (mm).
7) And sticking a layer of craft paper on the surface of the naturally degradable corner protector.
Example 2
A naturally degradable corner protector comprises the following dry materials in parts by weight:
64.4g (20 wt%) of cassava starch, 6.4g (2 wt%) of stearic acid, 90.2g (28 wt%) of pine needle powder and 161g (50 wt%) of bamboo, wherein the mixing ratio of dry materials to hot water is 1: 1.6, the temperature of the hot water is 95 ℃, and the dosage of the hot water is 515.2 g. The bamboo has a length of 1mm, a diameter of 0.01mm and a size of 30 meshes.
The preparation method of the naturally degradable corner protector comprises the following steps:
1) respectively pulverizing starch, stearic acid, pine needle powder and bamboo into powder for later use;
2) pouring starch into a mixer, adding a small amount of hot water, and stirring;
3) pouring the bamboo into a mixer, adding a small amount of hot water, and stirring;
4) then continuously pouring the pine needle powder into a mixer, and pouring the rest hot water into the mixer for stirring;
5) finally, pouring stearic acid into a mixer for stirring to obtain a paste solution;
6) pouring 180g of the paste solution obtained in step 5) into a mold, and heating at 150 ℃ for 15 minutes for molding to obtain a naturally degradable corner protector (L-shaped corner protector) with a thickness of 50X 5X 300 (mm).
7) And sticking a layer of craft paper on the surface of the naturally degradable corner protector.
Example 3
A naturally degradable corner protector comprises the following dry materials in parts by weight:
100g of cassava starch (35.2 wt%), 9g of stearic acid (3.2 wt%), 75g of pine needle powder (26.4 wt%) and 100g of straw (35.2 wt%), wherein the mixing ratio of dry materials to hot water is 1: 1.5. the temperature of the hot water was 100 ℃ and the amount of the hot water was 426 g. The length of the straw is 1.2mm, the diameter is 0.05mm, and the size is 30 meshes.
The preparation method of the naturally degradable corner protector comprises the following steps:
1) respectively crushing starch, stearic acid, pine needle powder and straws into powder for later use;
2) pouring starch into a mixer, adding a small amount of hot water, and stirring;
3) pouring the straws into a mixer, adding a small amount of hot water, and stirring;
4) then continuously pouring the pine needle powder into a mixer, and pouring the rest hot water into the mixer for stirring;
5) finally, pouring stearic acid into a mixer for stirring to obtain a paste solution;
6) pouring 180g of the paste solution obtained in the step 5) into a mold, and heating at 170 ℃ for 10 minutes for molding to obtain the naturally degradable corner protector (L-shaped corner protector) with the specification of 50 x 5 x 300 (mm).
7) And sticking a layer of craft paper on the surface of the naturally degradable corner protector.
Example 4
A naturally degradable corner protector comprises the following dry materials in parts by weight:
98.5g (21 wt%) of corn starch, 18.8g (4 wt%) of stearic acid, 93.8g (20 wt%) of pine needle powder and 30-60 g (55 wt%) of bran coat, wherein the mixing ratio of dry materials to hot water is 1: 1.6. the hot water temperature was 95 ℃ and the amount of hot water was 745.8 g. Wherein the length of the bran coat is 1.4mm, the diameter is 0.1mm, and the size is 50 meshes.
The preparation method of the naturally degradable corner protector comprises the following steps:
1) respectively crushing starch, stearic acid, pine needle powder and bran coat into powder for later use;
2) pouring starch into a mixer, adding a small amount of hot water, and stirring;
3) then pouring the bran coat into a mixer, adding a small amount of hot water and stirring;
4) then continuously pouring the pine needle powder into a mixer, and pouring the rest hot water into the mixer for stirring;
5) finally, pouring stearic acid into a mixer for stirring to obtain a paste solution;
6) pouring 180g of the paste solution obtained in step 5) into a mold, and heating at 170 ℃ for 9 minutes for molding to obtain a naturally degradable corner protector (L-shaped corner protector) of 50 x 5 x 300 (mm). Wherein the heating temperature is 150-180 ℃ and the time is 8-15 minutes.
7) And sticking a layer of craft paper on the surface of the naturally degradable corner protector.
Example 5
A naturally degradable corner protector comprises the following dry materials in parts by weight:
51.3g (22 wt%) of potato starch, 7g (3 wt%) of stearic acid, 69.9g (30 wt%) of pine needle powder and 104.9g (45 wt%) of waste paper scraps, wherein the mixing ratio of dry materials to hot water is 1: 1.5. the temperature of the hot water was 98 ℃ and the amount of hot water used was 349.7 g. The waste paper scrap has a length of 1mm, a diameter of 0.01mm and a size of 30 meshes.
The preparation method of the naturally degradable corner protector comprises the following steps:
1) respectively crushing starch, stearic acid, pine needle powder and waste paper scraps into powder for later use;
2) pouring starch into a mixer, adding a small amount of hot water, and stirring;
3) pouring the waste paper scraps into a mixer, adding a small amount of hot water, and stirring;
4) then continuously pouring the pine needle powder into a mixer, and pouring the rest hot water into the mixer for stirring;
5) finally, pouring stearic acid into a mixer for stirring to obtain a paste solution;
6) pouring 150g of the paste solution obtained in step 5) into a mold, and heating at 165 ℃ for 12 minutes to form a naturally degradable corner protector (L-shaped corner protector) of 50 × 5 × 300 (mm).
7) And sticking a layer of craft paper on the surface of the naturally degradable corner protector.
Comparative example 1
Comparative example 1 the components and preparation method were the same as in example 1 except that pine needle powder was not added.
Performance testing
1. The corner protectors of examples 1-5 were subjected to a longitudinal compression test with the following data:
TABLE 1 longitudinal corner bead stress data for examples 1-5
| Group of | Specification mm | Standard of merit | Longitudinal compressive resistance N |
| Example 1 | 50*50*5*300 | BB/T 0023-2017 | 1810 |
| Example 2 | 50*50*5*300 | BB/T 0023-2017 | 1850 |
| Example 3 | 50*50*5*300 | BB/T 0023-2017 | 1900 |
| Example 4 | 50*50*5*300 | BB/T 0023-2017 | 1830 |
| Example 5 | 50*50*5*300 | BB/T 0023-2017 | 1860 |
2. The corner protectors of examples 1-5 were tested for bending resistance with the following experimental data:
table 2 corner bead bending resistance data for examples 1-5
| Group of | Specification mm | Standard of merit | Bending resistance N |
| Example 1 | 50*50*5*300 | BB/T 0023-2017 | 600 |
| Example 2 | 50*50*5*300 | BB/T 0023-2017 | 630 |
| Example 3 | 50*50*5*300 | BB/T 0023-2017 | 660 |
| Example 4 | 50*50*5*300 | BB/T 0023-2017 | 630 |
| Example 5 | 50*50*5*300 | BB/T 0023-2017 | 620 |
3. The corner protectors of examples 1 to 5 and comparative example 1 were subjected to the mildew-proof and antibacterial property test, and the experimental data were as follows:
note: the antibacterial rate is more than or equal to 99 percent and can report strong antibacterial action, and the antibacterial rate is more than or equal to 90 percent and can report antibacterial action. The sample has a mildew grade: grade 0, no growth, i.e. no growth is observed under microscope magnification of 50 times; grade 1, trace growth, namely visible growth with naked eyes, but the growth coverage area is less than 10%; grade 2, the growth coverage area is not less than 10%
As can be seen from the data in tables 1 and 2, the longitudinal compressive strength of the naturally degradable corner protectors of examples 1 to 5 was greater than the 2-class longitudinal compressive strength of the same size paper corner protector (1540N), and the bending strength was less than the 2-class bending strength of the same size paper corner protector (800N). The cost of the naturally degradable angle bead of the invention is far lower than that of a paper angle bead, but the longitudinal compressive resistance value is larger than that of the paper angle bead, and the structural force is similar to that of the paper angle bead with the same specification.
As can be seen from the data in the table below in Table 2, the protective angle of comparative example 2 has a lower antibacterial rate and a lower mildew-resistant grade than those of examples 1 to 5 because no pine needle powder is added, which indicates that the pine needle powder can play a role in mildew prevention and antibiosis.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (7)
1. A preparation method of a naturally degradable corner protector is characterized by comprising the following steps:
1) respectively crushing the dry materials into powder for later use; wherein the dry material comprises the following raw materials in parts by weight: 20-40% of starch, 2-4% of stearic acid, 20-30% of pine needle powder and 30-60% of plant fiber and/or waste paper scrap; the mixing ratio of the dry materials to the hot water is 1: 1.5 to 1.7;
2) pouring starch into a mixer, adding a small amount of hot water, and stirring;
3) then pouring the plant fibers and/or the waste paper scraps into a mixer, adding a small amount of hot water and stirring;
4) then continuously pouring the pine needle powder into a mixer, and pouring the rest hot water into the mixer for stirring;
5) finally, pouring stearic acid into a mixer for stirring to obtain a paste solution;
6) pouring the paste solution obtained in the step 5) into a mould, and heating and forming to obtain the naturally degradable corner protector.
2. The method for preparing the naturally degradable corner protector as claimed in claim 1, wherein the temperature of the hot water in the step 1) is 95 to 100 ℃.
3. The method for preparing a naturally degradable corner protector as claimed in claim 1, wherein in step 1), the starch is one or more of corn starch, potato starch, sweet potato starch and tapioca starch.
4. The method for preparing the naturally degradable corner protector as claimed in claim 1, wherein in the step 1), the plant fiber is one or more of branches and stems of trees, reeds, bamboos, cottons and linens, straws and chaffs; the length of the plant fiber and/or the waste paper scrap is 1-1.5 mm, the diameter is 0.01-0.1 mm, and the size is 30-100 meshes.
5. The method for preparing the naturally degradable corner protector as claimed in claim 1, wherein the heating temperature in step 6) is 150 to 180 ℃ for 8 to 15 minutes.
6. The method for preparing a naturally degradable corner protector as claimed in claim 1, further comprising step 7) of attaching a layer of craft paper to the surface of the naturally degradable corner protector.
7. A naturally degradable corner protector, characterized in that it is produced by the process according to any one of claims 1 to 6.
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| CN202010676950.1A CN112011095A (en) | 2020-07-14 | 2020-07-14 | Naturally degradable corner protector and preparation method thereof |
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| CN202010676950.1A CN112011095A (en) | 2020-07-14 | 2020-07-14 | Naturally degradable corner protector and preparation method thereof |
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| CN115724670A (en) * | 2021-09-02 | 2023-03-03 | 广州至简通用设备制造有限公司 | Gelatinized polymeric refractory material and preparation method and application thereof |
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| CN115724670A (en) * | 2021-09-02 | 2023-03-03 | 广州至简通用设备制造有限公司 | Gelatinized polymeric refractory material and preparation method and application thereof |
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