WO2020211826A1

WO2020211826A1 - Environmentally-friendly composite plastic and plastic product

Info

Publication number: WO2020211826A1
Application number: PCT/CN2020/085235
Authority: WO
Inventors: 张蔚萱
Original assignee: 张蔚萱
Priority date: 2019-04-17
Filing date: 2020-04-17
Publication date: 2020-10-22
Also published as: CN109943088A

Abstract

The present invention relates an environmentally-friendly composite plastic and plastic product. The environmentally-friendly composite plastic comprises following components measured in percent by weight: 30-45% of polypropylene, 46-86% of tea fibers, 5-20% of a foaming agent, 3-10% of a filler, 0.05-3% of an antioxidant, and 0.1-5% of a pigment. The plastic product includes the environmentally-friendly composite plastic. The environmentally-friendly composite plastic of the present invention has a unique formula, and the raw material is environmentally friendly. The plastic is non-toxic and can directly contact food. The plastic comprising tea fibers have a natural tea fragrance, which is particularly suitable for the production of tea-containing utensils, tea brewing utensils, or tea-sealing utensils. Moreover, the product has good toughness, high strength, and is biodegradable.

Description

Environment-friendly composite plastic and plastic products

Technical field

The invention relates to polypropylene plastic modification technology, in particular to an environmentally friendly composite plastic and plastic products.

Background technique

Polypropylene material is non-toxic, odorless, and tasteless. It is widely used to prepare plastic products. Due to its poor cold resistance, low low-temperature impact strength, plus poor colorability, poor dyeability and printability, it is difficult to use for decoration The requested product category. Various modification methods have been tried in the prior art to improve the performance of polypropylene composite materials.

For example, invention patent application CN109535557A discloses a high-toughness plastic packaging bag material, whose raw materials include polypropylene, polyketone resin, compatibilizer, amino acid metal salt, antioxidant, ultraviolet absorber, and lubricant. The amino acid metal salt is prepared by the following process: adding propyl phosphoric anhydride to the amino acid, heating and reacting, and then drying to prepare a preform; adding the preform to an organic solvent, then adding the metal salt solution dropwise, heating and stirring for reaction, filtering, and drying. Prepared amino acid metal salt. The plastic packaging bag material has good toughness and high strength, but its use of polyketone resin and amino acid metal salt are toxic substances, which do not meet environmental protection requirements and are not suitable for packaging food.

Summary of the invention

The problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an environmentally friendly composite plastic. The composite plastic has stable appearance and color by adding tea fiber, foaming agent and other components, and solves the problem that polypropylene is difficult to print and dye. The problem is, at the same time, tea fiber and filler can be combined to obtain better toughness and strength.

The present invention also provides a plastic product containing the environmentally friendly composite plastic, which can be an appliance for holding tea, an appliance for brewing tea, or an appliance for sealing tea. For example, tea cans, tea cups, tea gift boxes, etc.

The present invention also provides a method for preparing the plastic product. The method fully utilizes the characteristics of each raw material according to the order of feeding, has short flow, simple operation, and easy industrial promotion.

The specific plan is as follows:

An environmentally friendly composite plastic, including the following components by weight percentage:

Further, the polypropylene is isotactic polypropylene or atactic polypropylene;

Optionally, the tea fiber is obtained by extracting at least one of tea stems, tea leaves or tea powder;

Optionally, the blowing agent is an ethylene-octene copolymer.

Further, the filler is at least one of dolomite, calcium carbonate, talc, silica, mica, barium sulfate, magnesium oxide, and calcium silicate;

Optionally, the antioxidant is antioxidant 1010 or antioxidant 1035;

Optionally, the pigment is an inorganic pigment, preferably titanium dioxide.

Further, the environmentally friendly composite plastic is composed of the following components in parts by weight:

A plastic product contains the environmentally-friendly composite plastic.

Further, the plastic product is an appliance for holding tea, an appliance for brewing tea, or an appliance for sealing tea.

A method for preparing the plastic product includes the following steps:

Step 1: Weigh each component according to the weight percentage;

Step 2: Mix the polypropylene and foaming agent in a high-mixer evenly, then add white oil, stir to fully coat the white oil on the resin; then add fillers, antioxidants, pigments and tea fibers in batches In the high-mixer, continue to mix evenly to obtain a mixture;

Step 3: Add the mixture prepared in step 2 to a twin-screw extruder, and perform extrusion granulation to obtain the environmentally friendly composite plastic particles;

Step 4: After drying the environmentally friendly composite plastic particles obtained in step 3, injection molding according to the designed size, to obtain the plastic product.

Further, the amount of white oil in step 2 is 0.1-0.3% of the total weight;

Optionally, the conditions for extrusion granulation in step 3 include: feeding port temperature 130-160°C, die temperature 160-175°C, mixing section temperature 200-220°C;

Optionally, the drying temperature in step 4 is 60-80°C.

Further, the conditions for extrusion granulation in step 3 include: the temperature of the feeding port is 150°C, the temperature of the die head is 170°C, and the temperature of the mixing section is 210°C; the drying temperature in step 4 is 70°C.

Beneficial effects: The environmentally friendly composite plastic of the present invention has a unique formula. The raw materials are environmentally friendly. The plastic itself is non-toxic and can directly contact food. The use of tea fiber has a natural tea fragrance, which is particularly suitable for the production of tea-containing appliances, tea brewing appliances, Or a device for sealing tea, and the product has good toughness and high strength. The product tea has high fiber content and can be degraded in natural environment.

detailed description

The technical scheme of the present invention will be further described below in conjunction with embodiments. For those who do not indicate specific technologies or conditions in the examples, it shall be carried out in accordance with the technologies or conditions described in the literature in the field or in accordance with the product specification. The reagents or instruments used without the manufacturer's indication are all conventional products that are commercially available.

In the embodiments, the tea fiber can be purchased from the market, or self-made, preferably extracted from at least one of tea stems, tea leaves or tea powder, and the extraction method can refer to invention patent application CN107794586A. For comparison, the injection molding model adopts a cylindrical tea can. It should be noted that the injection product of the present invention is not limited to tea cans. Others such as tea cups and tea gift boxes only need to be replaced with corresponding molds.

Example 1

The preparation of plastic tea cans includes the following steps:

Step 1: Weigh each component according to Table 1;

Step 2: Mix polypropylene and foaming agent uniformly in a high-mixer, then add 0.1% of the total weight of white oil, stir to fully coat the white oil on the resin; then add fillers, antioxidants, pigments and tea The fibers are added to the high-mixer in batches, and continue to be mixed uniformly, so that the inorganic powder and additives are evenly wrapped on the resin surface to obtain the mixture;

Step 3: Add the mixture prepared in step 2 to the twin-screw extruder for extrusion granulation, the feeding port temperature is 150°C, the die temperature is 170°C, and the mixing section temperature is 210°C to obtain the environmental protection Composite plastic particles;

Step 4: Dry the environmentally friendly composite plastic particles obtained in Step 3 at 70° C. for 30 minutes, and then injection-mold according to the design size of the tea can to obtain the plastic tea can.

Among them, polypropylene is industrial grade isotactic polypropylene, filler is calcium carbonate, antioxidant is antioxidant 1010, and pigment is titanium dioxide.

Table 1 Raw material consumption table (% by weight)

Example 2

To prepare plastic tea cans, the dosage of each component is shown in Table 1. The preparation method is the same as in Example 1, except that the dosage of white oil is 0.3% of the total weight. White oil can improve the compatibility of the components in the mixing process and make the texture of the product more uniform. In the later heating and drying process, the white oil will volatilize.

Example 3

Prepare plastic tea cans, the dosage of each component is shown in Table 1, and the preparation method is the same as in Example 1.

Example 4

Example 5

Prepare plastic tea cans. The amount of each component is shown in Table 1. The preparation method is the same as that of Example 1. The only difference is that in step 3, the temperature of the feeding port is 130°C, the temperature of the die is 160°C, and the temperature of the mixing section is 200°C. .

Example 6

Prepare plastic tea cans. The amount of each component is shown in Table 1. The preparation method is the same as in Example 1. The only difference is that the polypropylene is industrial grade random polypropylene, the filler is dolomite, and the antioxidant is antioxidant 1035.

Example 7

Prepare plastic tea cans. The amount of each component is shown in Table 1. The preparation method is the same as that of Example 1. The only difference is that in step 3, the temperature of the feeding port is 160℃, the temperature of the die is 175℃, and the temperature of the mixing section is 220℃. .

Comparative example 1

A comparative plastic tea can was prepared, the dosage of each component is shown in Table 1, and the preparation method is the same as in Example 1.

The prepared tea caddy is brown without tea fragrance,

Comparative example 2

Comparative example 3

The prepared tea cans are roughly light brown, but the dyeing distribution is uneven, and local spots appear. This may be due to the limited amount of tea fiber added to polypropylene, and the lack of titanium dioxide for covering makes the local appearance not up to standard.

Comparative example 4

A comparative plastic tea can was prepared. The amount of each component is shown in Table 1. The preparation method is the same as that of Example 1, except that white oil is not used in step 2. It was found that the mixing process took 2-3 times longer to obtain a feasible mixing effect, but the surface of the injection molded plastic product was frosted, and the fineness was lower than that of the plastic product in Example 1.

Performance test

Part of the samples prepared were tested for tensile strength and elongation at break according to GB1040-2006, and notched impact strength was tested with reference to GB/T 1843-2008. The results are as follows.

Table 2 Performance Test Table

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art will not depart from the principle and purpose of the present invention. Under the circumstances, changes, modifications, substitutions and modifications can be made to the above-mentioned embodiments within the scope of the present invention.

Claims

An environmentally friendly composite plastic, including the following components by weight percentage:
The environmentally friendly composite plastic according to claim 1, wherein the polypropylene is isotactic polypropylene or atactic polypropylene;

Optionally, the tea fiber is obtained by extracting at least one of tea stems, tea leaves or tea powder;

Optionally, the blowing agent is an ethylene-octene copolymer.
The environmentally friendly composite plastic according to claim 1, wherein the filler is at least one of dolomite, calcium carbonate, talc, silica, mica, barium sulfate, magnesium oxide, and calcium silicate;

Optionally, the antioxidant is antioxidant 1010 or antioxidant 1035;

Optionally, the pigment is an inorganic pigment, preferably titanium dioxide.
The environmentally friendly composite plastic according to any one of claims 1-3, wherein the environmentally friendly composite plastic is composed of the following components in parts by weight:
The environmentally-friendly composite plastic according to claim 4, wherein the environmentally-friendly composite plastic is composed of the following components in parts by weight:
A plastic product comprising the environmentally friendly composite plastic according to any one of claims 1-5.
The plastic product according to claim 6, wherein the plastic product is an appliance for holding tea, an appliance for brewing tea, or an appliance for sealing tea.
A method for preparing plastic products according to claim 6, characterized in that it comprises the following steps:

Step 1: Weigh each component according to the weight percentage of any one of claims 1-5;

Step 2: Mix the polypropylene and foaming agent in a high-mixer evenly, then add white oil, stir to fully coat the white oil on the resin; then add fillers, antioxidants, pigments and tea fibers in batches In the high-mixer, continue to mix evenly to obtain a mixture;

Step 3: Add the mixture prepared in step 2 to a twin-screw extruder, and perform extrusion granulation to obtain the environmentally friendly composite plastic particles;

Step 4: After drying the environmentally friendly composite plastic particles obtained in step 3, injection molding according to the designed size, to obtain the plastic product.
The method for preparing plastic products according to claim 8, wherein the amount of white oil in step 2 is 0.1-0.3% of the total weight;

Optionally, the conditions for extrusion granulation in step 3 include: feeding port temperature 130-160°C, die temperature 160-175°C, mixing section temperature 200-220°C;

Optionally, the drying temperature in step 4 is 60-80°C.
The method for preparing plastic products according to claim 8, characterized in that: the conditions for extrusion granulation in step 3 include: feeding port temperature 150°C, die temperature 170°C, mixing section temperature 210°C; drying in step 4 The dry temperature is 70°C.