CN102839442B - High-strength low-shrinkage polypropylene filament yarn and production method thereof - Google Patents

Abstract

The invention relates to high-strength low-shrinkage polypropylene filament yarn and a production method thereof. The high-strength low-shrinkage polypropylene filament yarn comprises the following materials: 92-98wt% of isotatic polypropylene, 0.1-2.0wt% of aluminum diformate, 1.0-5.0wt% of metallocene polypropylene and 0.2-2.0wt% of atactic polypropylene. According to the invention, a pre-orientation factor of an amorphous area is increased by adding atactic polypropylene and increasing draft multiple of the spinning jet, and the orientation factors of the amorphous area and a crystalline area are increased by increasing the draft multiple, so that the strength is increased; the degree of crystallinity of the PP (polypropylene) is improved by adding aluminum diformate and metallocene polypropylene at a higher crystallization temperature, thereby reducing the elongation at break. Production method has the characteristics of high spinning speed, low energy consumption and the like, improves the physical property of the polypropylene filament yarn, and prepares the high-strength low-shrinkage polypropylene filament yarn with strength of 7-8g/d, and the elongation at break of the 12-18%.

Description

A kind of high-strength low-shrinkage polypropylene filament yarn and production method thereof

Technical field

The present invention relates to a kind of high-strength low-shrinkage polypropylene filament yarn and production method thereof.

Background technology

At present high-strength low-shrinkage polypropylene filament yarn is that a horizontal step is spun production, and speed is per minute from tens meters to hundred meters slowly, and highly energy-consuming efficiency is low, and performance: intensity 6 ~ 7g/d, elongation at break 18 ~ 25%, can not meet technical development and client's demand.

Summary of the invention

The object of the invention is to overcome the shortcoming of existing polypropylene filament yarn production technology, a kind of high-strength low-shrinkage polypropylene filament yarn and production method thereof that speed is high, consume energy low of spinning is provided.

The present invention, its raw material proportioning of preparing is: isotactic polypropylene 92 ~ 98 wt %, aluminum diformate 0.1 ~ 2.0 wt %, metallocene polypropylene 1.0 ~ 5.0 wt %, random polypropylene 0.2 ~ 2.0 wt %.

The present invention produces on a vertical step spinning equipment, and its technique of preparing comprises:

A, batching: isotactic polypropylene 92 ~ 98wt%, aluminum diformate 0.1 ~ 2.0wt%, metallocene polypropylene 1.0 ~ 5.0wt%, random polypropylene 0.2 ~ 2.0wt%, the even post-drying of blend;

B, by screw extruder, technological temperature is 250 ~ 280 DEG C, first filters through 200 object prefilters, then through spinning head extruding spinning;

C, by reducing lateral blowing temperature and control lateral blowing speed the crystallization that reduces the PP of spinning head place, to improve amorphous area structure, the temperature of lateral blowing is 15 ~ 20 DEG C, the speed of lateral blowing is 0.3 ~ 0.8m/min;

D, by improving the drafting multiple of spinning head, to improve the preorientation factor of amorphous area and crystalline region of spinning head, the drafting multiple of spinning head is 50 ~ 120 times;

E, on drawing machine equipment, draft speed is 1500 ~ 2000m/min, drafting multiple is 5 ~ 12 times;

The temperature of F, drawing-off hot-rolling and hot case is 100 ~ 200 DEG C.

The present invention, affect the orientation factor that its high-intensity principal element is amorphous orientation factor and crystalline region, by adding random polypropylene and increasing the preorientation factor of amorphous area by increasing spinneret draft multiple, increase the orientation factor of amorphous area and the orientation factor of crystalline region by increasing drafting multiple, thereby increase its intensity.

The present invention, the principal element that affects its low contraction (elongation at break) is crystallization temperature, crystalline region size, crystalline region number and degree of crystallinity.By higher crystallization temperature, interpolation nucleator (aluminum diformate) and metallocene polypropylene, improve the degree of crystallinity of PP, shrink (reduction elongation at break) thereby reduce.

The present invention, has that the speed spun is high, the feature such as low that consumes energy, and has improved the physical property of polypropylene filament yarn, and intensity can reach 7 ~ 8g/d, the polypropylene filament yarn of the high-strength low-shrinkage of elongation at break 12 ~ 18%.

Detailed description of the invention

A kind of high-strength low-shrinkage polypropylene filament yarn is produced on a vertical step spinning equipment, and its technique of preparing comprises:

A, batching: fibre-grade isotactic polypropylene 94 wt %, aluminum diformate 0.4 wt %, metallocene polypropylene 4.0 wt %, random polypropylene 1.6wt %, the even post-drying of blend;

B, by screw extruder, technological temperature is 250 ~ 280 DEG C, first filters through 200 object prefilters, then through spinning head extruding spinning;

C, by reducing lateral blowing temperature and control lateral blowing speed the crystallization that reduces the PP of spinning head place, to improve amorphous area structure, the Temperature Setting of lateral blowing is 18 DEG C, the Speed Setting of lateral blowing is 0.6m/min;

D, by improving the drafting multiple of spinning head, to improve the preorientation factor of amorphous area and crystalline region of spinning head, the drafting multiple of spinning head is set as 80 times;

E, on drawing machine equipment, draft speed is set as 1700m/min, drafting multiple is set as 9.5 times;

The temperature of F, drawing-off hot-rolling and hot case is 100 ~ 200 DEG C, wherein: heat roller temperature is 110 ~ 140 DEG C; Heater temperature is set as 190 DEG C.

By the polypropylene filament yarn of its production gained, after testing, its key technical indexes: intensity is 7.51g/d, elongation at break is 13.6%.

The present invention, a described horizontal step is spun production and a vertical step is spun production, has respectively general equipment on market.

Claims (2)

1. a high-strength low-shrinkage polypropylene filament yarn, its raw material proportioning of preparing is: isotactic polypropylene 92 ~ 98 wt %, aluminum diformate 0.1 ~ 2.0 wt %, metallocene polypropylene 1.0 ~ 5.0 wt %, random polypropylene 0.2 ~ 2.0 wt %.

2. a production method of preparing high-strength low-shrinkage polypropylene filament yarn described in claim 1, is characterized in that: adopt a vertical step spinning equipment to produce, its technique of preparing comprises:

A, batching: isotactic polypropylene 92 ~ 98wt%, aluminum diformate 0.1 ~ 2.0wt%, metallocene polypropylene 1.0 ~ 5.0wt%, random polypropylene 0.2 ~ 2.0wt%, the even post-drying of blend;

B, by screw extruder, technological temperature is 250 ~ 280 DEG C, first filters through 200 object prefilters, then through spinning head extruding spinning;

C, by reducing lateral blowing temperature and control lateral blowing speed the crystallization that reduces the PP of spinning head place, to improve amorphous area structure, the temperature of lateral blowing is 15 ~ 20 DEG C, the speed of lateral blowing is 0.3 ~ 0.8m/min;

D, by improving the drafting multiple of spinning head, to improve the preorientation factor of amorphous area and crystalline region of spinning head, the drafting multiple of spinning head is 50 ~ 120 times;

E, on drawing machine equipment, draft speed is 1500 ~ 2000m/min, drafting multiple is 5 ~ 12 times;

The temperature of F, drawing-off hot-rolling and hot case is 100 ~ 200 DEG C.