CN102816336A - Method for preparing high filling plastic masterbatch for polypropylene woven bag - Google Patents

Abstract

The invention relates to a method for preparing high-filling plastic masterbatches for polypropylene woven bags. Inorganic powders with a particle size of 1250 mesh, such as calcite powder, marble powder or talc powder, are added in an amount of 1-1.5% relative to the weight of the inorganic powders. Active auxiliary agent, heated and mixed in a high-speed mixer, so that the active auxiliary agent is coated on the surface of the inorganic powder, when the temperature of the material rises to 105-120 degrees, add 5-10% polypropylene resin by the weight of the inorganic powder Continue mixing with 5-10% polyethylene wax by weight of inorganic powder, and the temperature of the material continues to rise. When the current of the high-speed mixer rises, the polyethylene wax gradually melts, and the mixed material sticks into pellets. At this time, the high-speed mixer will Adjust the rotation speed of the mixer to a low speed, open the discharge valve, release the material, cool, crush, and send it to the twin-screw extruder for granulation to obtain high-filling plastic masterbatch for polypropylene woven bags. Under the same strength of the woven bag, the invention has the advantages of large filling amount and smooth surface of the woven yarn, thereby effectively reducing the production cost of the woven bag.

Description

A preparation method of highly filled plastic masterbatch for polypropylene woven bags

technical field

The invention relates to a method for preparing high-filling plastic masterbatches for polypropylene woven bags, and belongs to the technical field of plastic filling modification.

Background technique

In the production process of woven bags, first of all, a certain amount of filled plastic masterbatch needs to be added to polypropylene and mixed, and then drawn into silk and woven into belts, which can not only improve the covering rate and coloring rate of silk, but also reduce the color of woven bags. the cost of. In the past, due to the defects of poor dispersion and coarse particle size of the filled plastic masterbatch, when the filled plastic masterbatch is added to polypropylene for mixing, the filling amount can generally only be added about 25%, and the filling amount is small. If the filling amount is increased, the strength of the yarn will be significantly reduced. At the same time, the ordinary plastic masterbatch is filled into the braided yarn, and the surface of the yarn is rough. The polypropylene resin is expensive, resulting in high cost of woven bags.

Contents of the invention

The invention discloses a preparation method of high-filling plastic masterbatches for polypropylene woven bags, mainly aiming at the poor dispersion of the existing filling plastic masterbatches in braiding and the low binding force between inorganic powder and polypropylene resin in the masterbatches In order to overcome the defects of coarse powder particle size, less filling amount, rough surface of woven wire, and expensive polypropylene woven bags, etc. In the present invention, the surface of the inorganic powder is subjected to coupling and activation treatment through a coupling agent to enhance the binding force with the polypropylene resin, so that the strength of the braided yarn does not decrease, and the filling amount of the filling masterbatch can be greatly increased. The plastic masterbatch prepared by the method of the invention not only has an additive amount of up to 35%, but also has a smooth and bright surface of the braided yarn, which effectively reduces the production cost of the braided bag.

The technical scheme of the present invention is realized like this:

A preparation method for highly filled plastic masterbatches for polypropylene woven bags, characterized in that it proceeds in accordance with the following steps:

Select an inorganic powder with a particle size of 1250 mesh, of which 10μ>97%, add 1 to 1.5% active auxiliary agent relative to the weight of the inorganic powder, heat and mix in a high-speed mixer, so that the active auxiliary agent is coated on the inorganic powder When the temperature of the material rises to 105-120 degrees, add 5-10% polypropylene resin by weight of the inorganic powder and 5-10% polyethylene wax by weight of the inorganic powder, and continue mixing, and the temperature of the material continues to rise. When the current of the high-speed mixer increases, the polyethylene wax gradually melts, and the mixed material sticks into pellets. At this time, the speed of the high-speed mixer is adjusted to a slow speed, the discharge valve is opened, the material is released, cooled, crushed, and sent to The twin-screw extruder granulates to obtain high-filling plastic masterbatches for polypropylene woven bags.

The inorganic powder is one of calcite powder, marble powder and talcum powder.

The coagent is one of titanate, aluminate and stearic acid.

The high-filling masterbatch for woven bags prepared by the method of the present invention is used in weaving, and compared with the past filling plastic masterbatch, it has the following characteristics:

1. Large filling amount: under the same strength, the filling amount of ordinary plastic masterbatch is 25%, while the filled plastic masterbatch of the present invention can be filled up to 35%.

2. Good surface finish: ordinary plastic masterbatches are filled into the braided yarn, and the surface of the yarn is rough, while the filled plastic masterbatch of the present invention makes the surface of the yarn smooth and bright.

3. With the filled plastic masterbatch of the present invention, because the filling amount increases, it replaces part of the expensive polypropylene resin, thereby reducing the production cost of the woven bag.

Detailed ways

The present invention will be described in detail below in conjunction with the examples.

Example 1

Take 100Kg of calcite powder (heavy calcium carbonate) with a water content of less than 0.1%, and 97% of its particle size is less than 10μ, put it in a high-speed mixer, add 1.5Kg of aluminate for high-speed mixing, when the temperature of the material rises to 120 Add 8Kg of polypropylene resin and 7Kg of polyethylene wax to continue mixing at high speed. When the current of the high-speed mixer rises, it indicates that the material begins to form cement. At this time, adjust the speed of the high-speed mixer to a slow speed and open the discharge valve. , release the material, cool, crush, and send it to the twin-screw extruder for granulation.

Example 2

Marble powder: the method is the same as above

Example 3

Talc powder: the method is the same as above

The control range of the amount of materials used in the present invention and the mixing temperature conditions will be described below in conjunction with the examples.

1. The range control of the amount of active additives added:

The amount of active auxiliary agent added is not less than 1% relative to the weight of the inorganic powder, otherwise the coating degree of the powder will be insufficient, resulting in a decrease in the activity of the powder. If it is higher than 1.5%, due to excessive coating, it is easy to cause adhesion between particles and it is difficult to disperse.

2. The range control of the amount of polypropylene resin added:

The amount of polypropylene resin added is not less than 5% relative to the weight of the inorganic powder, otherwise the strength and dispersibility of the product are poor. If it is higher than 10%, the production cost of the masterbatch will be relatively increased.

3. The range control of the amount of polyethylene wax added:

The amount of polyethylene wax added should not be less than 5% relative to the weight of the inorganic powder, otherwise it is not conducive to bonding and granulation. If it is higher than 10%, the production cost will increase and the product strength will also decrease.

4. Temperature range during material mixing:

During the high-speed mixing process, the temperature of the material will rise. When the temperature reaches 105-120 degrees, the added polypropylene resin and polyethylene wax begin to melt gradually, and the mixed material sticks into a pellet. The speed of the high-speed mixer is adjusted to a slow speed. The temperature of the material rises and then falls.

Claims (3)

1. a polypropylene woven bag is characterized in that carrying out according to following steps with the preparation method of high filled plastics master batch:

Selecting particle diameter for use is 1250 orders, wherein 10 μ>97% inorganic powder, add 1～1.5% coagent of relative inorganic powder weight; Heating mixes in high-speed mixer, makes the coagent bag multiple on the surface of inorganic powder, when temperature of charge rises to 105～120 when spending; Add 5～10% acrylic resins of inorganic powder weight and 5～10% polyethylene waxs of inorganic powder weight, continue to mix, temperature of charge continues to rise; When moment that the high-speed mixer electric current raises, polyethylene wax progressively melts, and mixture is sticking agglomerating granular; Open bleeder valve this moment with high-speed mixer rotating speed furnishing at a slow speed, emits material; Cooling, pulverizing are delivered to the twin screw extruder granulation and are promptly obtained polypropylene woven bag with high filled plastics master batch.

2. polypropylene woven bag according to claim 1 is characterized in that with the preparation method of high filled plastics master batch: said inorganic powder is a kind of in calcite in powder, marble flour, the talcum powder.

3. polypropylene woven bag according to claim 1 is characterized in that with the preparation method of high filled plastics master batch: said coagent is a kind of in metatitanic acid fat, aluminic acid ester, the Triple Pressed Stearic Acid.