CN110294892A - A kind of environmentally protective polyformaldehyde fibre reinforced polypropylene compound material and preparation method thereof - Google Patents

Abstract

The invention discloses a green and environment-friendly polyoxymethylene fiber-reinforced polypropylene composite material and a preparation method thereof. 0.8 part, 1-2 part of fiber surface treatment agent; The preparation method of described polyoxymethylene fiber reinforced polypropylene composite material: (1) under normal temperature condition, compatibilizer and polypropylene resin are mixed homogeneously in ethanol solution; ( 2) At a high temperature of 600-800°C, add ozone to the fiber surface treatment agent and polyoxymethylene fiber in a tube furnace for oxidation; (3) After cooling to room temperature, put it into a twin-screw extruder to extrude to obtain the product . The beneficial effect of the application: greatly reduces the pollution in the production and preparation process, the performance is not much lower than that of glass fiber, easy to recycle and reuse, makes polypropylene more widely used, reduces the surface roughness of the product, and is easier to shape. Improve the strength, modulus and heat resistance of the product.

Description

A kind of environment-friendly polyoxymethylene fiber reinforced polypropylene composite material and preparation method thereof

technical field

The invention relates to the field of polymer materials, in particular to a green and environment-friendly polyoxymethylene fiber reinforced polypropylene composite material and a preparation method thereof.

Background technique

Polypropylene (PP) has the characteristics of low density, low price, and excellent processing performance, but at the same time, it has defects such as poor impact performance and large shrinkage rate, which limit its further application. In order to improve the mechanical properties of PP, high-modulus fibers are added to it, and the strength, modulus and heat resistance of the fiber-reinforced polypropylene composite materials are significantly improved, and the cost advantage is obvious. It can replace engineering plastics in automobiles and buildings. Industrial, electrical equipment, cargo turnover boxes, pump bodies, etc.

Conventional fiber-reinforced polypropylene composite materials are reinforced with glass fibers, and the production and preparation processes are very polluted and difficult to recycle. There are generally two ways to recycle waste plastics. One is to blend with other waste plastics to prepare products that do not require high performance and hygiene. The blending of glass fiber reinforced resin and conventional resin will cause the surface of the product to be rough. The material cannot even be molded; the other is cracked into fuel oil. If it contains inorganic components, a large amount of impurities will be added, and the oil product cannot be used.

Contents of the invention

In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a green polyoxymethylene fiber-reinforced polypropylene composite material and a preparation method thereof, so that the strength, modulus and heat resistance of the product can be significantly improved.

According to the technical solution provided in the embodiments of the present application, a green and environment-friendly polyoxymethylene fiber reinforced polypropylene composite material and its preparation method include the following components in parts by weight: 60-80 parts of polypropylene resin, 3-10 parts of polyoxymethylene fiber , 0.5-0.8 part of compatibilizer, 1-2 part of fiber surface treatment agent; The preparation method of described polyoxymethylene fiber reinforced polypropylene composite material: (1) under normal temperature condition, compatibilizer and polypropylene resin are mixed in ethanol (2) Add ozone to the fiber surface treatment agent and polyoxymethylene fiber in a tube furnace for oxidation at a high temperature of 600-800°C; (3) After cooling to room temperature, put it into a twin-screw extruder The product is obtained by extruding from the machine.

In the present invention, the polypropylene resin is isotactic polypropylene.

In the present invention, the polyoxymethylene fiber is polyoxymethylene, and the crystallinity is 70%-75%.

In the present invention, the compatibilizer is a maleic anhydride compatibilizer, and its grafting rate is 0.8%-1.0%.

In summary, the beneficial effects of this application: greatly reduce the pollution in the production and preparation process, the performance is not much lower than that of glass fiber, easy to recycle and reuse, make polypropylene more widely used, and reduce the surface roughness of products , easier to form, and improve the strength, modulus and heat resistance of the product.

Detailed ways

The present application will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain related inventions, rather than to limit the invention. It should also be noted that, for the convenience of description, only the parts related to the invention are shown in the embodiments.

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below in conjunction with embodiments.

A green and environment-friendly polyoxymethylene fiber reinforced polypropylene composite material and a preparation method thereof, comprising the following components by weight: 60-80 parts of polypropylene resin, 3-10 parts of polyoxymethylene fiber, 0.5-0.8 part of compatibilizer, fiber 1-2 parts of surface treatment agent; the preparation method of the polyoxymethylene fiber reinforced polypropylene composite material: (1) under normal temperature conditions, the compatibilizer and polypropylene resin are mixed uniformly in ethanol solution; (2) at 600 Under the high temperature condition of -800°C, the fiber surface treatment agent and the polyoxymethylene fiber are oxidized in a tube furnace by adding ozone; (3) after cooling to room temperature, they are put into a twin-screw extruder to extrude to obtain the product. The polypropylene resin is isotactic polypropylene. The polyoxymethylene fiber is polyoxymethylene, and the crystallinity is 70%-75%. The compatibilizer is a maleic anhydride compatibilizer, and its grafting rate is 0.8%-1.0%.

Example 1

Preparation process: under normal temperature conditions, mix compatibilizer and polypropylene resin in ethanol solution evenly; Oxidation; after cooling to room temperature, put it into a twin-screw extruder to extrude to obtain the product.

Example 2

The preparation process is the same as above.

Example 3

The preparation process is the same as above.

Comparative Example 4

Comparative Example 5

The preparation process is the same as above.

Embodiment 6, investigation test of strength, modulus, heat resistance, surface roughness and pollutants of polyoxymethylene fiber reinforced polypropylene composite product:

(1) Use a plastic tensile strength tester to measure the strength of the product: use a sampler to cut 5 strips of 15mm wide and 200mm long strips from the sample horizontally and vertically, and clamp the two ends of the sample in the equipment respectively. The upper and lower clamps, the long axis direction of the sample should coincide with the center line of the upper and lower clamps, set the test speed, sample width and other parameter information, click the test start option, the test starts, the instrument automatically calculates and displays the final test results.

(2) Use the Young's modulus measuring instrument to measure the modulus of the product: adjust the Young's modulus measuring instrument, adjust the eyeglass, and add two weights under the steel wire to straighten the steel wire. Write down the ruler scale value observed in the telescope at this time, this is the n0 value. Add weights one by one, each time you add one, write down the corresponding scale value of the ruler until n7, at this time, 9 weights have been hung under the steel wire, add another weight, but don’t record the data, then remove this weight , write down the scale value of the ruler in the telescope, this is n7', subtract the weights one by one, and write down the corresponding scale value of the ruler until n0'. Measure the distance L from the plane mirror to the ruler with a meter ruler; print the tripod of the optical lever on paper, and measure b with a vernier caliper; measure the length l of the steel wire with a meter ruler; measure the steel wire at the upper, middle and lower parts of the steel wire with a micrometer The diameter d of each part is measured vertically and horizontally.

(3) Thermal deformation tester to test the heat resistance performance of the product: place the sample, load, adjust the dial gauge, raise the temperature to 200°C, and measure the deformation: start timing from the time of constant temperature rise, and record the hundred at certain intervals Sub-meter reading, temperature and time. Until the reading of the dial indicator is 2mm, the time interval to start recording can be about 15 minutes, and when the deformation is severe, record once every 0.5 to 1 minute.

(4) Surface roughness tester to test the roughness of the product: When the sensor is installed and starts to measure, please refer to the position of the stylus, try to adjust the cursor of the stylus position to the best "0" position, and use the position of the stylus to determine the position of the sensor. Try to keep the stylus in the middle position for measurement. In the main interface state, press the stylus position key to switch the stylus position. In the main interface state, press the start measurement key to start measurement

(5) Gas chromatograph test for pollutants: Turn on the power switch of the nitrogen, hydrogen and air generators (or the main valve of the nitrogen cylinder), adjust the output pressure to about 0.4Mpa, and set the temperature of each working department. The initial temperature is 50°C, the initial time is 10min, the heating rate is 5°C/min, the end temperature is 250°C, and the end time is 10min; (B) Sampling and detector: 250°C. The chromatographic conditions are: column temperature 140°C, start time 5min, heating rate 4°C/min, end temperature 240°C, end time 15min, (B) sampling temperature 260°C, detector temperature 280°C. Ignite, and after the baseline has stabilized and injected, simultaneously click the "Start" button or the shortcut button next to the chromatogram to analyze the chromatographic data.

Table 1

The above table 1 shows that the strength, modulus and heat resistance of the polyoxymethylene fiber-reinforced polypropylene composite material prepared in Examples 1-3 are not much lower than that of glass fiber, but the content of pollutants and surface roughness in the preparation process The degree is greatly reduced, and all mechanical indexes have been improved compared with polypropylene materials.

The above description is only a description of the preferred embodiments of the present application and the technical principles used. At the same time, the scope of the invention involved in this application is not limited to the technical solution formed by the specific combination of the above-mentioned technical features, but also covers the technical solutions made by the above-mentioned technical features or their equivalent features without departing from the inventive concept. Other technical solutions formed by any combination. For example, a technical solution formed by replacing the above-mentioned features with technical features with similar functions disclosed in (but not limited to) this application.

Claims (4)

1. A green environment-friendly polyoxymethylene fiber reinforced polypropylene composite material and preparation method thereof, is characterized in that: comprise the following components by weight: 60-80 parts of polypropylene resin, 3-10 parts of polyoxymethylene fiber, compatibilizer 0.5-0.8 parts, 1-2 parts of fiber surface treatment agent; the preparation method of the polyoxymethylene fiber reinforced polypropylene composite material: (1) under normal temperature conditions, the compatibilizer and polypropylene resin are mixed uniformly in ethanol solution ; (2) Under the high temperature condition of 600-800°C, add ozone to the fiber surface treatment agent and polyoxymethylene fiber in a tube furnace for oxidation; (3) After cooling to room temperature, put it into a twin-screw extruder to extrude get the product. 2. A green and environment-friendly polyoxymethylene fiber-reinforced polypropylene composite material and its preparation method according to claim 1, characterized in that: the polypropylene resin is isotactic polypropylene. 3. A green and environment-friendly polyoxymethylene fiber-reinforced polypropylene composite material and its preparation method according to claim 1, characterized in that: the polyoxymethylene fiber is polyoxymethylene copolymer with a crystallinity of 70%-75%. 4. A kind of green environment-friendly polyoxymethylene fiber reinforced polypropylene composite material and its preparation method according to claim 1, is characterized in that: described compatibilizer is maleic anhydride compatibilizer, and its graft rate is 0.8% -1.0%.