PET (Polyethylene Terephthalate) material surface treating agent and use method thereof

Abstract

The invention discloses a PET material surface treating agent and a using method thereof, and belongs to the technical field of cosmetic packaging materials. The PET material surface treating agent is prepared from the following components in parts by weight: 12 to 20 parts of alcoholysis agent, 5 to 8 parts of micromolecular hydrophilic substance and 8 to 10 parts of hydrolysis-resistant agent. The interior of the PET material treated by the PET material surface treating agent has hydrophilic property, and the PET material surface treating agent is used for cosmetic packaging materials and can adsorb and maintain moisture in cosmetics, prevent loss of moisture in the cosmetics and maintain stability and effectiveness of the cosmetics.

Description

Technical Field

[0001] The invention relates to the technical field of cosmetic packaging materials, and in particular to a PET material surface treatment agent and a preparation method thereof. Background Art

[0002] PET is a widely used plastic material. Its good mechanical properties, chemical stability and transparency make it the material of choice in packaging, beverage bottles and other fields. However, the surface hydrophilicity of PET materials is poor and it is difficult to be compatible with polar substances such as water, which limits its use in certain application fields. Therefore, improving the hydrophilicity of PET materials is an important research direction. In contrast, although hydrophobic packaging materials can provide waterproof protection, they are not easy to absorb and retain moisture, which may cause the moisture and active ingredients in cosmetics to be lost more easily. In addition, hydrophobic materials may be more easily wetted by oils and other contaminants, thereby increasing the risk of microbial contamination. Therefore, in the field of cosmetic packaging, there is an urgent need to improve the hydrophilicity of hydrophobic packaging materials because they can better maintain the stability and safety of the product. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a PET material surface treatment agent, which is used to treat the PET material so that the interior of the treated PET material has a hydrophilic property and can be used for cosmetic packaging materials. It can absorb and retain moisture in the cosmetics, prevent the loss of moisture in the cosmetics, and maintain the stability and effectiveness of the cosmetics.

[0004] The purpose of the present invention is achieved by the following technical solutions:

[0005] The PET material surface treatment agent comprises, by weight, 12-20 parts of an alcoholysis agent, 5-8 parts of a small molecule hydrophilic substance, and 8-10 parts of an anti-hydrolysis agent.

[0006] Furthermore, according to weight parts, it includes 15 parts of alcoholysis agent, 5 parts of small molecule hydrophilic substance and 8 parts of anti-hydrolysis agent.

[0007] Furthermore, the anti-hydrolysis agent is carbodiimide.

[0008] Furthermore, the small molecule hydrophilic substance is a mixture of one or more of polyols, amino acids, hyaluronic acid, provitamin B5, and natural moisturizing factors.

[0009] Furthermore, the polyol is a mixture of one or more of glycerol, butylene glycol, propylene glycol, xylitol and sorbitol.

[0010] Furthermore, the alcoholysis agent is methanol or ethylene glycol.

[0011] Furthermore, the PET material is a PET film or a PET plastic bottle.

[0012] The present invention also provides a method for preparing a PET material surface treatment agent, comprising the following steps: S1, immersing the PET material in the alcoholysis agent for hydrolysis reaction, adding the anti-hydrolysis agent after partial hydrolysis to terminate the hydrolysis of the PET material, drying the PET material after hydrolysis, and then corona treating the surface of the dried PET material to obtain a PET material with hydrophilic interior.

[0013] Furthermore, the alcoholysis agent is the methanol, and the hydrolysis conditions are: using a urea-based low eutectic solvent prepared from a mixture of urea and zinc acetate as a catalyst, the hydrolysis reaction is carried out at a reaction temperature of 180 to 280° C. and a reaction pressure of 2 to 4 MPa, and the reaction time is 0.5 to 1 hour.

[0014] Furthermore, the alcoholysis agent is the ethylene glycol, and the hydrolysis conditions are: the hydrolysis reaction is carried out at a reaction temperature of 180 to 250° C. and the reaction time is 0.5 to 1 hour.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The PET material surface treatment agent provided by the present invention is used to treat the PET material, and the inside of the treated PET material has a hydrophilic property. It is used for cosmetic packaging materials, can absorb and retain moisture in cosmetics, prevent the loss of moisture in cosmetics, maintain the stability and effectiveness of cosmetics, and maintain the freshness and effectiveness of products. Hydrophilic packaging materials can better control the humidity in cosmetic packaging and reduce product deterioration caused by humidity changes. Hydrophilic packaging materials can reduce the migration of ingredients in cosmetics to packaging materials, which is particularly important for products containing active ingredients, because these ingredients may react with packaging materials and affect the safety and effectiveness of products. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with specific embodiments. It should be noted that, under the premise of no conflict, the embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0018] Example 1

[0019] The PET material surface treatment agent provided in this embodiment includes, by weight, 15 parts of an alcoholysis agent, 5 parts of a small molecule hydrophilic substance, and 8 parts of an anti-hydrolysis agent.

[0020] In this embodiment, methanol is a common solvent used for the alcoholysis of PET and undergoes depolymerization through transesterification reactions. Methanol alcoholysis is carried out under the action of a catalyst, with the reaction temperature and pressure being 180 - 280 °C and 2 - 4 MPa respectively, and the main products being dimethyl terephthalate (DMT) and ethylene glycol (EG).

[0021] In this embodiment, ethylene glycol is also used for the glycolysis of PET, and the main products are bis(2-hydroxyethyl) terephthalate (BHET) and ethylene glycol (EG). Glycolysis is similar to methanol alcoholysis and also undergoes depolymerization through transesterification. The glycolysis temperature of PET is generally 180 - 250 °C, and the reaction time is 8 - 10 hours.

[0022] Adding anti-hydrolysis agents: Adding anti-hydrolysis agents such as carbodiimide compounds to PET materials can effectively inhibit the hydrolysis aging of polyester materials, improve the performance of polyester materials such as PET, and extend their service life.

[0023] This embodiment also provides a preparation method for a PET material surface treatment agent, including the following steps: S1. Immerse the PET material in an alcoholysis agent for hydrolysis reaction. After partial hydrolysis, add an anti-hydrolysis agent to terminate the hydrolysis of the PET material. After hydrolysis, dry the PET material, and then perform corona treatment on the surface of the dried PET material to obtain a PET material with hydrophilicity inside the material.

[0024] Corona treatment: It is an electric shock treatment that generates a discharge on the material surface through high-frequency and high-voltage, producing low-temperature plasma, causing free radical reactions on the material surface, increasing surface roughness and surface area, and improving surface energy. Through active substances such as ozone generated by corona discharge, corona treatment causes oxidation and polarization on the material surface, increasing surface adhesion. The surface of the material after corona treatment has higher surface energy and adhesion. The effect of corona treatment is to improve the wettability and adhesion of the material surface, rather than directly forming patterns or shapes. The molecular chains of PET plastics are arranged tightly, and the molecular chains of PET materials have a high degree of crystallinity and orientation. This structural feature makes it not easily penetrated and eroded by chemical substances, and after corona treatment, it can increase the hydrophilicity to external water.

[0025] Product stability:

[0026] Preventing water penetration: Hydrophilic packaging materials, due to their strong affinity for water, can attract water molecules or dissolve in water. This characteristic makes hydrophilic packaging materials not easily penetrated by external moisture, thereby protecting cosmetics from the influence of humidity.

[0027] Reducing the interaction between water molecules and the packaging material: The surface of hydrophilic materials is easily wetted by water, and this wettability helps to form a uniform and tight sealing layer, reducing the interaction between water molecules and the packaging material, and reducing the loss or increase of moisture in cosmetics.

[0028] Reducing the risk of microbial contamination: Hydrophilic packaging materials can reduce the attachment and reproduction of microorganisms on the packaging surface because hydrophilic surfaces are not conducive to the growth of microorganisms, thereby reducing the risk of microbial contamination of cosmetics.

[0029] In this embodiment, the small molecule substances can be one or a mixture of polyols, amino acids, hyaluronic acid, provitamin B5, and natural moisturizing factors. These are all substances used in cosmetics. Generally, the pore structure of PET materials is relatively small, and small molecule hydrophilic substances are not easily permeated. However, when the hydrolysis reaction occurs, the pore structure of PET materials will change, thereby increasing the possibility of small molecule hydrophilic substances permeating through PET materials. And using an anti-hydrolysis agent to control the hydrolysis reaction of PET materials causes partial hydrolysis of the PET materials, reducing the impact on the material properties.

[0030] Preventing microbial contamination: Hydrophilic materials usually have strong anti-contamination capabilities because they are not easily wetted by oils and other contaminants. This characteristic helps prevent external bacteria and other microorganisms from entering the product, thereby extending the shelf life of cosmetics.

[0031] Example 2

[0032] The PET material surface treatment agent provided in this embodiment, by weight, includes 12 parts of an alcoholysis agent, 8 parts of small molecule hydrophilic substances, and 9 parts of an anti-hydrolysis agent.

[0033] This embodiment also provides a preparation method for the PET material surface treatment agent, including the following steps: S1. Immerse the PET material in the alcoholysis agent for hydrolysis reaction. After partial hydrolysis, add the anti-hydrolysis agent to terminate the hydrolysis of the PET material. After hydrolysis, dry the PET material, and then perform corona treatment on the surface of the dried PET material to obtain a PET material with hydrophilicity inside the material.

[0034] Example 3

[0035] The PET material surface treatment agent provided in this embodiment, by weight, includes 20 parts of an alcoholysis agent, 7 parts of small molecule hydrophilic substances, and 7 parts of an anti-hydrolysis agent. This embodiment also provides a preparation method for the PET material surface treatment agent, including the following steps: S1. Immerse the PET material in the alcoholysis agent for hydrolysis reaction. After partial hydrolysis, add the anti-hydrolysis agent to terminate the hydrolysis of the PET material. After hydrolysis, dry the PET material, and then perform corona treatment on the surface of the dried PET material to obtain a PET material with hydrophilicity inside the material.

[0036] The above embodiments are only preferred embodiments of the present invention, and the scope of protection of the present invention cannot be limited thereby. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention fall within the scope of protection required by the present invention.

Claims

1. PET material surface treatment agent, characterized in that, Calculated by weight, it includes 12-20 parts of alcoholysis agent, 5-8 parts of small molecule hydrophilic substance and 8-10 parts of anti-hydrolysis agent.

2. The PET material surface treatment agent according to claim 1, characterized in that: Calculated by weight, the composition comprises 15 parts of alcoholysis agent, 5 parts of small molecule hydrophilic substance and 8 parts of anti-hydrolysis agent.

3. The PET material surface treatment agent according to claim 2, characterized in that: The anti-hydrolysis agent is carbodiimide.

4. The PET material surface treatment agent according to claim 1, characterized in that: The small molecule hydrophilic substance is a mixture of one or more of polyols, amino acids, hyaluronic acid, provitamin B5, and natural moisturizing factors.

5. The PET material surface treatment agent according to claim 1, characterized in that: The polyol is a mixture of one or more of glycerol, butylene glycol, propylene glycol, xylitol and sorbitol.

6. The PET material surface treatment agent according to claim 1, characterized in that: The alcoholysis agent is methanol or ethylene glycol.

7. The PET material surface treatment agent according to claim 1, characterized in that: The PET material is a PET film or a PET plastic bottle.

8. The method for using the PET material surface treatment agent according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, immersing the PET material in the alcoholysis agent for hydrolysis reaction, adding the anti-hydrolysis agent after partial hydrolysis to terminate the hydrolysis of the PET material, drying the PET material after hydrolysis, and then corona treating the surface of the dried PET material to obtain a PET material with hydrophilic interior.

9. The method for using the PET material surface treatment agent according to claim 8, characterized in that: The alcoholysis agent is the methanol, and the hydrolysis conditions are: using a urea-based low eutectic solvent prepared from a mixture of urea and zinc acetate as a catalyst, the hydrolysis reaction is carried out at a reaction temperature of 180 to 280° C. and a reaction pressure of 2 to 4 MPa, and the reaction time is 0.5 to 1 hour.

10. The method for using the PET material surface treatment agent according to claim 8, characterized in that: The alcoholysis agent is the ethylene glycol, and the hydrolysis conditions are: the hydrolysis reaction is carried out at a reaction temperature of 180 to 250° C. and the reaction time is 0.5 to 1 hour.