Biodegradable gas-phase antirust film and preparation process thereof

Abstract

The invention relates to a biodegradable gas-phase antirust film, which is composed of the following components in percentage by mass: 85% of biodegradable material; 8% of a gas phase corrosion inhibitor; 5% of a plasticizer; 0.5% of a filler, wherein the filler is a mixture of white carbon black and calcium carbonate; 1% of an antioxidant 1010; and 0.5% of a light stabilizer 6911. The main component of the gas-phase antirust film is biodegradable materials, and the biodegradable materials can be decomposed by microorganisms in the natural environment and finally converted into carbon dioxide and water, so that the environmental pollution is reduced, and the requirement of sustainable development is met. Besides, part of tea polyphenol is added, and the tea polyphenol can inhibit nitrosamine, so that sodium nitrite is prevented from generating nitrosamine. The gas-phase antirust film is prepared from small particles, so that the overall processing performance of the gas-phase antirust film can be effectively improved, and the dispersity of various components is improved.

Description

Technical Field

[0001] The invention relates to a gas phase antirust film, in particular to a biodegradable gas phase antirust film and a preparation process thereof. Background Art

[0002] Vapor phase anti-rust film is a metal protective packaging material that has developed rapidly in recent years. The vapor phase corrosion inhibitor contained in it can automatically evaporate to the metal surface, forming a protective layer on the metal surface, which plays a role in inhibiting metal corrosion.

[0003] The existing vapor phase anti-rust films used in industrial products all use non-degradable polyolefin materials as the base material, which is very expensive to recycle and reuse after use, and easily leads to a series of environmental problems. As the country's requirements for environmental protection become increasingly stringent, the use of biodegradable materials as the base material has become a research topic that needs to be broken through. Summary of the invention

[0004] The main purpose of the present invention is to provide a biodegradable gas phase antirust film, which uses biodegradable materials as a substrate, which is beneficial to environmental protection. At the same time, multiple materials are used as gas phase corrosion inhibitors, which have low toxicity and little environmental pollution.

[0005] In order to achieve the above object, the present invention provides a biodegradable gas phase anti-rust film, which is composed of the following components by mass percentage:

[0006] Biodegradable materials: 85%;

[0007] Vapor phase corrosion inhibitor: 8%;

[0008] Plasticizer: 5%;

[0009] Filler: 0.5%, the filler is a mixture of white carbon black and calcium carbonate;

[0010] Antioxidant 1010: 1%;

[0011] Light stabilizer 6911: 0.5%.

[0012] Preferably, the vapor phase corrosion inhibitor is composed of sodium nitrite, sodium benzoate, dicyclohexylamine octanoate, sodium tungstate, sodium bicarbonate, and tea polyphenols, wherein the mass ratio of the six is ​​5:30:10:20:30:5.

[0013] Preferably, the plasticizer is tributyl citrate.

[0014] Preferably, the biodegradable material is composed of polylactic acid and polybutylene succinate, and the mass ratio of the two is 3:7.

[0015] More preferably, the particle size of the biodegradable material is 20 μm.

[0016] Preferably, the particle sizes of white carbon black and calcium carbonate are both 20 μm, and the mass ratio between the two is 1:1.

[0017] The present invention also provides a process for preparing a biodegradable gas phase anti-rust film, comprising the following steps:

[0018] S1: grinding, sieving and mixing the biodegradable material; wherein the biodegradable material in this step is composed of polylactic acid and polybutylene succinate materials, the mass ratio of the two is 3:7, and the particle size of the biodegradable material is 20 μm;

[0019] S2: Grind and mix the solid components of the vapor corrosion inhibitor, plasticizer, filler, antioxidant 1010, and light stabilizer 691:

[0020] The gas phase corrosion inhibitor is composed of sodium nitrite, sodium benzoate, dicyclohexylamine octanoate, sodium tungstate, sodium bicarbonate and tea polyphenols, and the mass ratio of the six is ​​5:30:10:20:30:5;

[0021] The filler is a mixture of white carbon black and calcium carbonate, the particle size of white carbon black and calcium carbonate are both 20 μm, and the mass ratio of the two is 1:1;

[0022] The plasticizer is tributyl citrate;

[0023] S3: Mix the raw materials of step S1 and step S2 and then granulate and blow mold.

[0024] The beneficial effects of the present invention are:

[0025] The main components of the gas phase anti-rust film of the present invention are biodegradable materials, which can be decomposed by microorganisms in the natural environment and finally converted into carbon dioxide and water, thereby reducing environmental pollution and meeting the requirements of sustainable development. In addition, in the present invention, a part of tea polyphenols is added, and tea polyphenols can be used to inhibit the effect of nitrosamines and prevent sodium nitrite from generating nitrosamines. The present invention is made of microparticles, which can effectively improve the overall processing performance of the gas phase anti-rust film and improve the dispersibility of various components. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention are described clearly and completely below. In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0027] Example 1

[0028] This embodiment provides a preparation process of a biodegradable gas phase rust-proof film, comprising the following steps:

[0029] S1: Grinding, sieving and mixing the biodegradable material; wherein the biodegradable material in this step is composed of polylactic acid and polybutylene succinate materials, the mass ratio of the two is 3:7, and the particle size of the biodegradable material is 20 μm; wherein the biodegradable material accounts for 85% of the total mass.

[0030] S2: Grind and mix the solid components of the vapor corrosion inhibitor, plasticizer, filler, antioxidant 1010, and light stabilizer 691:

[0031] The gas phase corrosion inhibitor is composed of sodium nitrite, sodium benzoate, dicyclohexylamine octanoate, sodium tungstate, sodium bicarbonate and tea polyphenols, and the mass ratio of the six is ​​5:30:10:20:30:5. In addition, the gas phase corrosion inhibitor accounts for 8% of the total mass fraction.

[0032] The filler is a mixture of white carbon black and calcium carbonate, the particle size of white carbon black and calcium carbonate are both 20 μm, and the mass ratio of the two is 1:1. The filler accounts for 0.5% of the total mass.

[0033] The plasticizer is tributyl citrate, and the plasticizer accounts for 5% of the total mass. Among other components, the antioxidant 1010 accounts for 1% of the total mass, and the light stabilizer 6911 accounts for 0.5% of the total mass.

[0034] S3: Mix the raw materials of step S1 and step S2 and then granulate and blow mold.

[0035] 1. The above Example 1 was tested using the standard in GB / T 19532-2018

[0036]

[0037] 2. Biodegradation experiment

[0038] The soil burial method was used. The samples were dried and buried in moist soil. The temperature was kept at 25-30 degrees during the test. The samples were taken out from the soil at regular intervals to observe the degradation, calculate the sample weight loss rate, and test the mechanical properties of the samples. After 90 days of soil burial, the sample surface appeared rough and had holes. The original mass of the gas phase anti-rust film was 20.05g.

[0039]

[0040]

[0041] 3. Nitrosamine Residue Detection

[0042] The experimental method adopts the gas phase corrosion inhibition ability detection method in GB / T 19532-2018. The test piece is made of 45# steel. After the test is completed, the nitrosamine on the surface of 45# steel is detected by high performance liquid chromatography (HPLC):

[0043] Comparative Example 1:

[0044] The vapor phase corrosion inhibitor is composed of sodium nitrite, sodium benzoate, dicyclohexylamine octanoate, sodium tungstate, sodium bicarbonate, and tea polyphenols, wherein the mass ratio of the six is ​​5:50:12:20:10:3, and the other ingredients remain unchanged.

[0045] In this embodiment, the addition of sodium bicarbonate and tea polyphenols is reduced. Compared with Example 1, the nitrosamine content in Comparative Example 1 is higher than the nitrosamine content in Example 1.

[0046] Comparative Example 2

[0047] The vapor phase corrosion inhibitor is composed of sodium nitrite, sodium benzoate, dicyclohexylamine octanoate, sodium tungstate, sodium bicarbonate, and tea polyphenols, wherein the mass ratio of the six is ​​5:20:8:20:40:7, and the other ingredients remain unchanged.

[0048] In this embodiment, the addition of sodium bicarbonate and tea polyphenols is reduced. Compared with Example 1, the nitrosamine content in Comparative Example 2 is not much different from that in Example 1.

[0049] It can be seen that adding an appropriate amount of sodium bicarbonate and tea polyphenols can help inhibit the formation of nitrosamines. As a part of the vapor phase corrosion inhibitor, sodium bicarbonate can not only form a protective film on the metal surface, thereby effectively preventing the metal from rusting, but also adjust the pH value of the steel surface. Sodium bicarbonate can be used to adjust the pH of the solution and inhibit the formation of nitrosamines. At the same time, tea polyphenols play an auxiliary inhibitory role, thereby reducing the toxicity of the vapor phase protective film.

[0050] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A biodegradable gas phase rust-proof film, characterized in that: By mass percentage, it is composed of the following components: Biodegradable materials: 85%; Vapor phase corrosion inhibitor: 8%; Plasticizer: 5%; Filler: 0.5%, the filler is a mixture of white carbon black and calcium carbonate; Antioxidant 1010: 1%; Light stabilizer 6911: 0.5%.

2. The biodegradable gas phase rust-proof film according to claim 1, characterized in that: The gas phase corrosion inhibitor consists of sodium nitrite, sodium benzoate, dicyclohexylamine octanoate, sodium tungstate, sodium bicarbonate and tea polyphenols, wherein the mass ratio of the six is ​​5:30:10:20:30:

5.

3. The biodegradable gas phase rust-proof film according to claim 1, characterized in that: The plasticizer is tributyl citrate.

4. The biodegradable gas phase rust-proof film according to claim 1, characterized in that: The biodegradable material is composed of polylactic acid and polybutylene succinate materials, and the mass ratio of the two is 3:

7.

5. The biodegradable gas phase rust-proof film according to claim 4, characterized in that: The particle size of the biodegradable material is 20 μm.

6. The biodegradable gas phase rust-proof film according to claim 1, characterized in that: The particle sizes of the white carbon black and calcium carbonate are both 20 μm, and the mass ratio between the two is 1:

1.

7. A process for preparing a biodegradable gas phase anti-rust film, characterized in that: The following steps are involved: S1: grinding, sieving and mixing the biodegradable material; wherein the biodegradable material in this step is composed of polylactic acid and polybutylene succinate materials, the mass ratio of the two is 3:7, and the particle size of the biodegradable material is 20 μm; S2: Grind and mix the solid components of the vapor corrosion inhibitor, plasticizer, filler, antioxidant 1010, and light stabilizer 691: The vapor phase corrosion inhibitor is composed of sodium nitrite, sodium benzoate, dicyclohexylamine octanoate, sodium tungstate, sodium bicarbonate, and tea polyphenols, wherein the mass ratio of the six is ​​5:30:10:20:30:5; The filler is a mixture of white carbon black and calcium carbonate, the particle sizes of the white carbon black and calcium carbonate are both 20 μm, and the mass ratio of the two is 1:1; The plasticizer is tributyl citrate; S3: Mix the raw materials of step S1 and step S2 and then granulate and blow mold.

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