Zero waste liquid packaging film

Abstract

The invention relates to the technical field of packaging films, and proposes a zero-waste liquid packaging film, which comprises the following components by weight: 10-20 parts of PVA, 3-5 parts of starch, 1-2 parts of citric acid, 1-2 parts of plasticizer, 0.5-1.5 parts of surfactant, 1-2 parts of bactericide, and 70-80 parts of water. Through the above technical scheme, the problems of poor antibacterial performance and poor mechanical performance of PVA water-soluble films in the prior art are solved.

Description

Technical Field

[0001] The invention relates to the technical field of packaging films, and in particular to a zero-waste liquid packaging film. Background Art

[0002] With the improvement of living standards, consumers' requirements for the convenience of daily chemical products are gradually increasing. Ordinary finished detergents are in the form of bags, bottles or cans, which are not quantitative and lightweight. For this reason, single-chamber or multi-chamber liquid detergents have appeared on the market, which are usually composed of polyvinyl alcohol (PVA) water-soluble films as cavity films to wrap detergents. The detergents are concentrated detergents, and one tablet is used for each wash, which is easy and convenient.

[0003] PVA is a water-soluble polymer with excellent performance and wide application. The film prepared from it has excellent oxygen barrier, oil barrier, wear resistance, tear resistance, transparency, antistatic, printability, chemical corrosion resistance and solvent selectivity, etc. It is water-soluble and biodegradable under certain conditions and can be degraded by microorganisms into H2O and CO2. It is an eco-friendly polymer. However, the mechanical properties of pure PVA material will deteriorate in a high humidity environment, which leads to the inability of PVA water-soluble film to provide good protection against detergents in a high humidity environment. In addition, the antibacterial performance needs to be improved.

[0004] Therefore, providing a PVA water-soluble film with good antibacterial properties and good mechanical properties in a high-humidity environment is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] The invention provides a zero-waste liquid packaging film, which solves the problems of poor antibacterial performance of PVA water-soluble films in related technologies and deterioration of mechanical properties in a high-humidity environment.

[0006] The technical solution of the present invention is as follows:

[0007] The zero-waste liquid packaging film comprises the following components in parts by weight: 10-20 parts of PVA, 3-5 parts of starch, 1-2 parts of citric acid, 1-2 parts of plasticizer, 0.5-1.5 parts of surfactant, 1-2 parts of bactericide, and 70-80 parts of water.

[0008] As a further technical solution, the plasticizer includes one or more of glycerol, propylene glycol, and triethylene glycol.

[0009] As a further technical solution, the surfactant includes one or both of sodium dodecyl sulfate and sodium dodecylbenzene sulfonate.

[0010] As a further technical solution, the bactericide includes iodopropynyl n-butylcarbamate and polyhexamethylene guanidine.

[0011] As a further technical solution, the mass ratio of iodopropynyl n-butylamine formate and polyhexamethylene guanidine is 1:1.

[0012] The present invention also proposes a method for preparing a zero-waste liquid packaging film, and the specific steps are as follows: starch, citric acid, a surfactant, a plasticizer, and a bactericide are sequentially added to a PVA aqueous solution, mixed evenly, coated, and dried to obtain a packaging film.

[0013] As a further technical solution, the PVA aqueous solution is obtained by stirring PVA in water at 80 to 90° C. for 90 to 100 minutes.

[0014] As a further technical solution, during the mixing, the temperature is 85-95° C. and the mixing time is 45-55 min.

[0015] As a further technical solution, filtering is also included before coating.

[0016] As a further technical solution, the packaging film has a thickness of 30 μm.

[0017] The working principle and beneficial effects of the present invention are:

[0018] 1. The packaging film provided by the present invention can be used as the outer film of laundry beads. The present invention uses polyvinyl alcohol (PVA) as the main raw material. PVA is a water-soluble material that degrades into carbon dioxide and water after being dissolved. When used as the outer film of laundry beads, there is no need to worry about it remaining on clothes or in the washing machine.

[0019] 2. After the packaging film provided by the present invention wraps the laundry detergent, the film and the laundry detergent together constitute the product itself, forming condensed beads. During use, they dissolve in water and do not generate packaging waste, thereby achieving zero waste of the packaging film. The packaging film is a degradable and environmentally friendly material, which is beneficial to environmental protection and innovative sustainable development.

[0020] 3. The citric acid in the zero-waste liquid packaging film component provided by the present invention can produce a strong interaction with starch, thereby improving the waterproof performance and mechanical properties of the packaging film. In addition, the interaction between iodopropynyl n-butylamine formate and polyhexamethylene guanidine and polyvinyl alcohol, the main raw material of the packaging film, not only improves the antibacterial property of the packaging film, but also improves the waterproof performance and mechanical properties of the packaging film. DETAILED DESCRIPTION

[0021] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the 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.

[0022] Example 1

[0023] S1, dissolving 15 parts of PVA in 80 parts of water at 90° C. with stirring for 100 min to obtain a PVA aqueous solution;

[0024] S2. Add 5 parts of starch, 2 parts of citric acid, 1 part of sodium lauryl sulfate, 1 part of glycerol, 0.8 parts of iodopropynyl n-butylamine formate and 0.8 parts of polyhexamethylene guanidine to the obtained PVA aqueous solution in sequence, mix at 90° C. for 50 minutes, filter, coat, and dry to obtain a packaging film.

[0025] Example 2

[0026] S1, dissolving 10 parts of PVA in 70 parts of water at 80°C with stirring for 90 minutes to obtain a PVA aqueous solution;

[0027] S2. Add 3 parts of starch, 1 part of citric acid, 0.5 parts of sodium lauryl sulfate, 1.5 parts of propylene glycol, 0.5 parts of iodopropynyl n-butylamine formate and 0.5 parts of polyhexamethylene guanidine to the obtained PVA aqueous solution in sequence, mix at 85° C. for 55 minutes, filter, coat, and dry to obtain a packaging film.

[0028] Example 3

[0029] S1, dissolving 20 parts of PVA in 75 parts of water at 85°C with stirring for 95 min to obtain a PVA aqueous solution;

[0030] S2. Add 4 parts of starch, 1.5 parts of citric acid, 1.5 parts of sodium dodecylbenzene sulfonate, 2 parts of triethylene glycol, 1 part of iodopropynyl n-butylamine formate and 1 part of polyhexamethylene guanidine to the obtained PVA aqueous solution in sequence, mix at 95° C. for 45 minutes, filter, coat, and dry to obtain a packaging film.

[0031] Example 4

[0032] S1, dissolving 15 parts of PVA in 80 parts of water at 90° C. with stirring for 100 min to obtain a PVA aqueous solution;

[0033] S2. Add 5 parts of starch, 2 parts of citric acid, 1 part of sodium lauryl sulfate, 1 part of glycerol, 0.5 parts of iodopropynyl n-butylamine formate and 0.8 parts of polyhexamethylene guanidine to the obtained PVA aqueous solution in sequence, mix at 90° C. for 50 minutes, filter, coat, and dry to obtain a packaging film.

[0034] Example 5

[0035] S1, dissolving 15 parts of PVA in 80 parts of water at 90° C. with stirring for 100 min to obtain a PVA aqueous solution;

[0036] S2. Add 5 parts of starch, 2 parts of citric acid, 1 part of sodium lauryl sulfate, 1 part of glycerol, 1.2 parts of iodopropynyl n-butylamine formate and 0.8 part of polyhexamethylene guanidine to the obtained PVA aqueous solution in sequence, mix at 90° C. for 50 minutes, filter, coat, and dry to obtain a packaging film.

[0037] Example 6

[0038] S1, dissolving 15 parts of PVA in 80 parts of water at 90° C. with stirring for 100 min to obtain a PVA aqueous solution;

[0039] S2. Add 5 parts of starch, 2 parts of citric acid, 1 part of sodium lauryl sulfate, 1 part of glycerol and 0.8 parts of iodopropynyl n-butylamine formate to the obtained PVA aqueous solution in sequence, mix at 90° C. for 50 minutes, filter, coat, and dry to obtain a packaging film.

[0040] Example 7

[0041] S1, dissolving 15 parts of PVA in 80 parts of water at 90° C. with stirring for 100 min to obtain a PVA aqueous solution;

[0042] S2. Add 5 parts of starch, 2 parts of citric acid, 1 part of sodium lauryl sulfate, 1 part of glycerol and 0.8 parts of polyhexamethylene guanidine to the obtained PVA aqueous solution in sequence, mix at 90° C. for 50 minutes, filter, coat and dry to obtain a packaging film.

[0043] Comparative Example 1

[0044] S1, dissolving 15 parts of PVA in 80 parts of water at 90° C. with stirring for 100 min to obtain a PVA aqueous solution;

[0045] S2. Add 5 parts of starch, 2 parts of citric acid, 1 part of sodium lauryl sulfate and 1 part of glycerol to the obtained PVA aqueous solution in sequence, mix at 90° C. for 50 minutes, filter, coat, and dry to obtain a packaging film.

[0046] The packaging films with a thickness of 30 μm obtained in Examples 1 to 7 and Comparative Example 1 were tested for water resistance with reference to GB / T 1540-2002; the tensile strength and elongation at break were tested with reference to GB / T 1040.3-2006; the test results are recorded in Table 1.

[0047] Table 1 Waterproofness and mechanical properties of packaging film

[0048]

[0049]

[0050] It can be seen from Table 1 that the packaging films provided by Examples 1 to 5 of the present invention have excellent waterproofness and mechanical properties.

[0051] The only difference between Example 6 and Example 1 is that polyhexamethylene guanidine is not added, the only difference between Example 7 and Example 1 is that iodopropynyl n-butylamine formate is not added, and the only difference between Comparative Example 1 and Example 1 is that polyhexamethylene guanidine and iodopropynyl n-butylamine formate are not added. After comparing the packaging films provided by Examples 6 to 7, Comparative Example 1 and Example 1, it is found that polyhexamethylene guanidine and iodopropynyl n-butylamine formate synergize to improve the waterproof performance and mechanical properties of the packaging film.

[0052] The antibacterial properties of the packaging films with a thickness of 30 μm obtained in Examples 1 to 5 were measured with reference to QB / T 2591-2003; the test results are recorded in Table 2.

[0053] Table 2 Antibacterial properties of packaging films

[0054] Example 1 Example 2 Example 3 Example 4 Example 5 Escherichia coli inhibition rate (%) 96.6 96.0 97.5 95.8 97.8 Staphylococcus aureus inhibition rate (%) 97.4 96.2 98.1 96.8 98.5

[0055] It can be seen from Table 2 that the packaging films provided by Examples 1 to 5 of the present invention have excellent antibacterial properties.

[0056] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Zero waste liquid packaging film, characterized in that: The composition comprises the following components in parts by weight: 10-20 parts of PVA, 3-5 parts of starch, 1-2 parts of citric acid, 1-2 parts of plasticizer, 0.5-1.5 parts of surfactant, 1-2 parts of bactericide, and 70-80 parts of water; The bactericide includes iodopropynyl n-butylamine formate and polyhexamethylene guanidine; The mass ratio of iodopropynyl n-butylamine formate to polyhexamethylene guanidine is 1:

1.

2. The zero-waste liquid packaging film according to claim 1, characterized in that: The plasticizer includes one or more of glycerol, propylene glycol and triethylene glycol.

3. The zero-waste liquid packaging film according to claim 1, characterized in that: The surfactant includes one or both of sodium dodecyl sulfate and sodium dodecylbenzene sulfonate.

4. The method for preparing a zero-waste liquid packaging film according to any one of claims 1 to 3, characterized in that: The specific steps are as follows: starch, citric acid, surfactant, plasticizer and bactericide are sequentially added into the PVA aqueous solution, mixed evenly, coated, and dried to obtain the packaging film.

5. The method for preparing a zero-waste liquid packaging film according to claim 4, characterized in that: The PVA aqueous solution is obtained by stirring PVA in water at 80-90° C. for 90-100 minutes.

6. The method for preparing a zero-waste liquid packaging film according to claim 4, characterized in that: During the mixing, the temperature is 85-95° C. and the mixing time is 45-55 min.

7. The method for preparing a zero-waste liquid packaging film according to claim 4, characterized in that: The method further includes filtering before coating.

8. The method for preparing a zero-waste liquid packaging film according to claim 4, characterized in that: The packaging film has a thickness of 30 μm.

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