CN103510181A - Viscose fiber compound nucleating agent-containing concrete enhancement high-strength polypropylene crude fiber and preparation method thereof - Google Patents

Abstract

The invention relates to a high-strength polypropylene crude fiber for concrete reinforcement containing a viscose fiber compound nucleating agent and a preparation method thereof. The polypropylene crude fiber of the present invention is a blend of 90-99% polypropylene, 0.1-2.5% nucleating agent, 0.5-5% compatibilizer, 0.1-1.5% antioxidant and 0.1-1% ultraviolet absorber. The preparation method is to first dry the nucleating agent to constant weight, then mix it with other substances in proportion to form a mixture, extrude the mixture through a twin-screw extruder, and spin it through a spinneret, and then cool it with water, heat Water drafting, hot roll drafting, heat setting, forming coarse fibers. The invention uses an organic-inorganic composite nucleating agent to modify polypropylene to obtain high-strength and high-modulus polypropylene crude fibers. The method modification and the spinning process of the invention are completed in one step, which is more conducive to simplifying the production process and reducing the product cost.

Description

A kind of high-strength polypropylene crude fiber for concrete reinforcement containing viscose fiber composite nucleating agent and preparation method thereof

technical field

The invention belongs to the technical field of polymer materials, and relates to a high-strength polypropylene crude fiber and a preparation method thereof, in particular to a high-strength polypropylene crude fiber for concrete reinforcement containing a viscose fiber compound nucleating agent and a preparation method thereof .

Background technique

Due to its high compressive strength, concrete is widely used in many occasions with different stress characteristics and performance requirements, including houses, bridges, dams, airports, highways, railways, ports, etc. one of the materials. However, it also has disadvantages such as poor toughness, low tensile strength, high brittleness, and easy cracking. Therefore, improving the tensile strength and toughness of concrete and prolonging its engineering service life is an important direction to improve the performance of concrete, which has important application value.

It is a widely used method to increase the tensile strength of concrete by mixing concrete with various fibers. Among them, polypropylene fiber can effectively improve the impact toughness, crack resistance, frost resistance and impermeability of concrete. At the same time, it has good chemical stability, good self-dispersion, acid and alkali resistance, corrosion resistance, and other characteristics, so it is widely used. A fibrous material used for concrete reinforcement.

The Chinese patent with the application number 01142105.3 discloses a polypropylene fiber for improving concrete cracking defects and its preparation method, by adding a modified high polymer resin to the polypropylene resin for melt spinning, and the spinning temperature is 240 ~310°C, and surface treatment with alkyl phosphate ethanolamine, the obtained fiber has enhanced adhesion to concrete, and has better compatibility with cement matrix, thereby improving the crack resistance of concrete, and has the characteristics of preventing concrete cracking. The Chinese patent application number 98103243.5 proposes to reinforce cement-based composite materials with fine polypropylene fibers. It is mainly used for large-scale water conservancy facilities and storage tanks with high requirements for anti-cracking and anti-leakage. Among them, 100 parts of cement matrix, 0.005-0.5 of fine polypropylene fiber, the length of monofilament of fine polypropylene fiber is 0.5-20.dtex, and the length is 3-50mm. Application number is the Chinese patent of 96116519.7, has announced a kind of polypropylene coarse fiber of cement anti-cracking, and this fiber is superficial porous, and cross section is Y-shaped, mixes this fiber of 0.9kg/ ^m3 in cement concrete and can significantly improve cement strength. The mechanical properties of the product. The Chinese patent application number 200810021644.3 discloses a kind of polypropylene crude fiber for concrete and its preparation method. This patent uses one or more of amorphous silica and silica fume active fly ash as an interface modifier, and adds a certain amount of polypropylene white masterbatch, antioxidant and ultraviolet absorber to prepare an improved permanent polypropylene fiber. The interface modifier on the surface of the fiber can participate in the hydration reaction, improve the interfacial bonding between the fiber and the cement matrix, enhance the dispersion of the fiber in the cement, and fully exert the strengthening and toughening effect of the fiber on the cement concrete.

Some polypropylene fiber reinforced cement concrete methods disclosed in the above-mentioned patents mainly increase the strength and crack resistance of the concrete by increasing the surface roughness of the fibers and improving the interface properties between the fibers and the concrete. However, the improvement of the toughness and crack resistance of concrete by the polypropylene fiber modified by the above method is very limited.

In the method of preparing high-performance concrete by using polypropylene fiber, the modulus and strength of polypropylene fiber directly affect the toughness and crack resistance of concrete. In order to obtain high-strength and high-modulus fibers, this patent uses viscose fiber as the organic component in the nucleating agent and the inorganic component in the nucleating agent to compound and add polypropylene to promote the heterogeneous nucleation of polypropylene and improve the quality of polypropylene. At the same time as the crystallinity, it can induce the orientation of polypropylene crystals along the fiber monofilament direction, making the polypropylene thick fiber anisotropic, which is more conducive to improving the strength modulus of the polypropylene thick fiber in the tensile direction.

Contents of the invention

An object of the present invention is to address the deficiencies in the prior art and provide a high-strength polypropylene crude fiber for concrete reinforcement containing a viscose fiber composite nucleating agent. The fiber has higher strength and modulus and can be used to prepare High performance concrete material.

The high-strength polypropylene crude fiber for concrete reinforcement containing the viscose fiber composite nucleating agent of the present invention is a blend, and the blend includes polypropylene, a nucleating agent, a compatibilizer, an antioxidant, and an ultraviolet absorber; The percentage by weight of each raw material in the high-strength polypropylene crude fiber for concrete reinforcement containing viscose fiber compound nucleating agent is: polypropylene 90-99%, nucleating agent 0.1-2.5%, compatibilizer 0.5- 5%, antioxidant 0.1~1.5%, UV absorber 0.1~1%;

The polypropylene is a homopolymer with an isotacticity ≥ 97%, and a melt index of 3-40g/10min;

The nucleating agent is an organic-inorganic compound nucleating agent; the organic-inorganic compound nucleating agent is composed of an organic component and an inorganic component in a mass ratio of 1:20 to 20:1, wherein the organic component is viscose fiber, The inorganic component is one or more of attapulgite, calcium carbonate, silicon oxide and montmorillonite.

The length of the viscose fiber is 2-10 mm; the fineness of the single filament of the viscose fiber is 1.1-6.6 dtex.

The compatibilizer is one of maleic anhydride grafted polypropylene, acrylic acid grafted polypropylene, acrylamide grafted polypropylene, methacrylic acid grafted polypropylene, glycidyl methacrylate grafted polypropylene or more; the role of the compatibilizer is to improve the compatibility between the inorganic filler and polypropylene, enhance the interface adhesion, and improve the mechanical properties of the material.

The antioxidant is one of the antioxidant 1010, the antioxidant b215, the antioxidant 168, the antioxidant 1076, and the antioxidant b225; the function of the antioxidant is to reduce the oxidative degradation of the polypropylene crude fiber during processing.

The ultraviolet absorber is one of UV-12, UV-326, UV-327, UV-328, UV-329, UV-770, and the effect of the ultraviolet absorber is to reduce the photoaging.

Another object of the present invention is to provide a method for preparing the above-mentioned high-strength polypropylene crude fiber for concrete reinforcement containing viscose fiber composite nucleating agent.

The method for preparing the high-strength polypropylene crude fiber for concrete reinforcement containing viscose fiber composite nucleating agent is specifically:

Step (1). First dry the nucleating agent to constant weight, and then mix polypropylene, nucleating agent, compatibilizer, antioxidant, and ultraviolet absorber in proportion to form a compound;

Prepare 100 parts by weight of high-strength polypropylene crude fiber for concrete reinforcement containing viscose fiber composite nucleating agent, the amount of each material used is: 90-99 parts of polypropylene, 0.1-2.5 parts of nucleating agent, 0.5-5 parts of compatibilizer, 0.1-1.5 parts of antioxidant, 0.1-1 part of ultraviolet absorber.

Step (2). The mixture is extruded through a twin-screw extruder, spun through a spinneret, and then subjected to water cooling, hot water drawing, hot roller drawing, and heat setting to obtain high-strength polypropylene crude fibers.

The processing temperature of the twin-screw extruder is: feeding section 120-150°C, plasticizing section 150-180°C, homogenizing section 180-205°C, head temperature 180-195°C, screw speed 80-250rpm.

The temperature of the spinneret is 250-270° C.; the die shape of the spinneret is one of circle, ellipse, triangle and square.

The water cooling is quenching the spun polymer melt in a water bath at 10-40°C to form low-crystallinity polypropylene fibers, which facilitates obtaining higher draw ratios and orientation degrees during stretching;

The water bath temperature of the hot water drawing is 60-95°C, and the drawing ratio is 2-6 times;

The drawing temperature of the hot roll drawing is 120-150°C, and the drawing ratio is 1.5-6 times;

The heat-setting temperature is 110-150° C., and the time is 15s-5 minutes.

The invention adopts organic-inorganic compound nucleating agent to modify polypropylene, induces polypropylene to crystallize along the direction of carbon fiber monofilament, makes the material anisotropic, thereby improving the strength of polypropylene crude fiber in the stretching direction, and obtaining high strength and high modulus Amount of polypropylene crude fiber. The polypropylene coarse fiber of the invention can enhance the strength of concrete and prolong its service life. The method modification and the spinning process of the invention are completed in one step, which is more conducive to simplifying the production process and reducing the product cost.

Detailed ways

The present invention is further analyzed below in conjunction with specific examples (the polypropylene used is the homopolymer of isotacticity ≥ 97%, and melt index is 3～40g/10min; The length of viscose fiber is 2～10mm; The length of viscose fiber is 2～10mm; Single filament fineness is 1.1~6.6dtex).

Example 1.

Step (1). 96g polypropylene, 3.5g maleic anhydride grafted polypropylene, 0.3g antioxidant 1010, 0.2g ultraviolet absorber UV-12 are mixed into 100g compound;

Step (2). Add the compound to the twin-screw extruder for extrusion. The processing temperature of the twin-screw extruder is 150°C in the feeding section, 180°C in the plasticizing section, 190°C in the homogenizing section, and 185°C in the head temperature. The screw speed is 200rpm; the spinneret is sprayed at 250°C, the die shape of the spinneret is circular, and then water-cooled in a 10°C water bath, and hot water drafting is carried out in a 60°C water bath, and the draft ratio is 5 times. Then hot roll drawing was carried out at 120° C., and the draw ratio was 4 times. Finally, heat setting was carried out at 110° C. for 5 minutes to obtain polypropylene crude fibers.

The polypropylene thick fiber prepared in Example 1 had an equivalent diameter of 1mm, a breaking strength of 500Mpa, an elastic modulus of 4026Mpa, and a breaking elongation of 15%.

Example 2.

Step (1). Mix 94.5g polypropylene, 1.5g viscose fiber-attapulgite compound nucleating agent (viscose fiber: attapulgite = 1:20), 3.5g maleic anhydride grafted polypropylene, 0.3 g antioxidant 1010, 0.2g ultraviolet absorber UV-12 are mixed into 100g compound;

Step (2). Add the compound to the twin-screw extruder for extrusion. The processing temperature of the twin-screw extruder is 150°C in the feeding section, 180°C in the plasticizing section, 190°C in the homogenizing section, and 185°C in the head temperature. The screw speed is 200rpm; the spinneret is sprayed at 250°C, the die shape of the spinneret is circular, and then water-cooled in a 10°C water bath, and hot water drafting is carried out in a 60°C water bath, and the draft ratio is 5 times. Then hot roll drawing was carried out at 120° C., and the draw ratio was 4 times. Finally, heat setting was carried out at 110° C. for 5 minutes to obtain polypropylene crude fibers.

The polypropylene thick fiber prepared in Example 2 had an equivalent diameter of 1 mm, a breaking strength of 650 MPa, an elastic modulus of 12148 MPa, and a breaking elongation of 25%.

Example 3.

Step (1). 95g polypropylene, 1g viscose fiber-attapulgite compound nucleating agent (viscose fiber: attapulgite = 1:20), 3.5g maleic anhydride grafted polypropylene, 0.3g anti- Oxidant 1010, 0.2g ultraviolet absorber UV-12 are mixed into 100g compound;

Step (2). Add the compound to the twin-screw extruder for extrusion. The processing temperature of the twin-screw extruder is 150°C in the feeding section, 180°C in the plasticizing section, 190°C in the homogenizing section, and 185°C in the head temperature. The screw speed is 200rpm; the spinneret is sprayed at 250°C, the die shape of the spinneret is circular, and then water-cooled in a 10°C water bath, and hot water drafting is carried out in a 60°C water bath, and the draft ratio is 5 times. Then hot roll drawing was carried out at 120° C., and the draw ratio was 4 times. Finally, heat setting was carried out at 110° C. for 5 minutes to obtain polypropylene crude fibers.

The polypropylene thick fiber prepared in Example 3 had an equivalent diameter of 1mm, a breaking strength of 595Mpa, an elastic modulus of 7929Mpa, and a breaking elongation of 20%.

Example 4.

Step (1). 94.7g polypropylene, 1.3g viscose fiber-attapulgite compound nucleating agent (viscose fiber: attapulgite = 1:20), 3.5g maleic anhydride grafted polypropylene, 0.3 g antioxidant 1010, 0.2g ultraviolet absorber UV-12 are mixed into 100g compound;

Step (2). Add the compound to the twin-screw extruder for extrusion. The processing temperature of the twin-screw extruder is 150°C in the feeding section, 180°C in the plasticizing section, 190°C in the homogenizing section, and 185°C in the head temperature. The screw speed is 200rpm; the spinneret is sprayed at 250°C, the die shape of the spinneret is circular, and then water-cooled in a 10°C water bath, and hot water drafting is carried out in a 60°C water bath, and the draft ratio is 5 times. Then hot roll drawing was carried out at 120° C., and the draw ratio was 4 times. Finally, heat setting was carried out at 110° C. for 5 minutes to obtain polypropylene crude fibers.

The polypropylene thick fiber prepared in Example 4 had an equivalent diameter of 1mm, a breaking strength of 620Mpa, an elastic modulus of 10720Mpa, and a breaking elongation of 23%.

Example 5.

Step (1). Mix 94.8g polypropylene, 1.2g viscose fiber-attapulgite compound nucleating agent (viscose fiber: attapulgite = 1:20), 3.5g maleic anhydride grafted polypropylene, 0.3 g antioxidant 1010, 0.2g ultraviolet absorber UV-12 are mixed into 100g compound;

Step (2). Add the compound to the twin-screw extruder for extrusion. The processing temperature of the twin-screw extruder is 150°C in the feeding section, 180°C in the plasticizing section, 190°C in the homogenizing section, and 185°C in the head temperature. The screw speed is 200rpm; the spinneret is sprayed at 250°C, the die shape of the spinneret is circular, and then water-cooled in a 10°C water bath, and hot water drafting is carried out in a 60°C water bath, and the draft ratio is 5 times. Then hot roll drawing was carried out at 120° C., and the draw ratio was 4 times. Finally, heat setting was carried out at 110° C. for 5 minutes to obtain polypropylene crude fibers.

The polypropylene thick fiber prepared in Example 5 had an equivalent diameter of 1mm, a breaking strength of 612Mpa, an elastic modulus of 9510Mpa, and a breaking elongation of 22%.

Table 1 The performance parameter table of the polypropylene crude fiber prepared in Examples 1-5

As shown in Table 1, according to the comparison of Examples 1 to 5, it can be known that the strength and modulus of the polypropylene crude fiber are significantly improved after adding the organic-inorganic compound nucleating agent, and the prepared polypropylene crude fiber has better performance. .

Example 6.

Step (1). 90g polypropylene, 2.5g viscose fiber-attapulgite compound nucleating agent (viscose fiber: attapulgite = 20:1), 5g acrylic acid grafted polypropylene, 1.5g antioxidant b215 , 1g ultraviolet absorber UV-326, mixed into 100g mixture;

Step (2). Add the mixture to the twin-screw extruder for extrusion. The processing temperature of the twin-screw extruder is 120°C in the feeding section, 150°C in the plasticizing section, 180°C in the homogenizing section, and 180°C in the head temperature. The screw speed is 80rpm; then the spinneret is sprayed at 250°C, the die shape of the spinneret is circular, and then water-cooled in a 10°C water bath, and hot water drafting is carried out in a 60°C water bath, and the draft ratio is 2 times. Then hot roll drawing was carried out at 120°C with a draw ratio of 1.5 times, and finally heat setting was carried out at 110°C for 5 minutes to obtain high-strength polypropylene crude fibers.

Example 7.

Step (1). 99g polypropylene, 0.1g viscose fiber-calcium carbonate compound nucleating agent (viscose fiber: calcium carbonate = 1:5), 0.5g acrylamide grafted polypropylene, 0.1g antioxidant 168 , 0.3g ultraviolet absorber UV-327, mixed into 100g mixture;

Step (2). Add the mixture to the twin-screw extruder for extrusion. The processing temperature of the twin-screw extruder is 125°C in the feeding section, 155°C in the plasticizing section, 185°C in the homogenizing section, and 185°C in the head temperature. The screw speed is 100rpm; then the spinneret is sprayed at 255°C, the shape of the die of the spinneret is circular, and then water-cooled in a 15°C water bath, and hot water drafting is carried out in a 65°C water bath, and the draft ratio is 2 times. Then hot roll drawing was carried out at 125° C., the draw ratio was 2 times, and finally heat setting was carried out at 120° C. for 4 minutes to obtain high-strength polypropylene crude fibers.

Example 8.

Step (1). 98g polypropylene, 0.5g viscose fiber-silica compound nucleating agent (viscose fiber: silica = 1:1), 1g methacrylic acid grafted polypropylene, 0.4g antioxidant 1076 , 0.1g ultraviolet absorber UV-328, mixed into 100g mixture;

Step (2). Add the mixture to the twin-screw extruder for extrusion. The processing temperature of the twin-screw extruder is 130°C in the feeding section, 160°C in the plasticizing section, 190°C in the homogenizing section, and 185°C in the head. The rotation speed of the screw is 150rpm; then the spinneret is sprayed at 260°C, the shape of the die of the spinneret is circular, and then water-cooled in a 20°C water bath, and hot water drafting is carried out in a 70°C water bath with a draft ratio of 4 times, and then Hot roll drawing was carried out at 130°C, the draw ratio was 3 times, and finally heat setting was carried out at 125°C for 3 minutes to obtain high-strength polypropylene crude fibers.

Example 9.

Step (1). 95g polypropylene, 1g viscose fiber-montmorillonite compound nucleating agent (viscose fiber:montmorillonite=1:10), 2g glycidyl methacrylate grafted polypropylene, 1g Antioxidant b225, 1g ultraviolet absorber UV-329, mixed into 100g mixture;

Step (2). Add the mixture to the twin-screw extruder for extrusion. The processing temperature of the twin-screw extruder is 135°C in the feeding section, 165°C in the plasticizing section, 195°C in the homogenizing section, and 190°C in the head. The screw speed is 200rpm; then the spinneret is sprayed at 265°C, the die shape of the spinneret is square, and then water-cooled in a 25°C water bath, and hot water drafting is carried out in a 75°C water bath with a draft ratio of 5 times, and then Hot roll drawing was carried out at 140°C, the draw ratio was 4 times, and finally heat setting was carried out at 130°C for 2 minutes to obtain high-strength polypropylene crude fibers.

Example 10.

Step (1). Combine 94g polypropylene, 2g viscose fiber-attapulgite-montmorillonite compound nucleating agent (viscose fiber: attapulgite:montmorillonite=1:10:10), 1.5g horse Toric anhydride grafted polypropylene, 1g glycidyl methacrylate grafted polypropylene, 1g antioxidant b225, 0.5g ultraviolet absorber UV-770, mixed into 100g compound;

Step (2). Add the mixture to the twin-screw extruder for extrusion. The processing temperature of the twin-screw extruder is 140°C in the feeding section, 170°C in the plasticizing section, 200°C in the homogenizing section, and 195°C in the head. The screw speed is 250rpm; then the spinneret is sprayed at 270°C, the die shape of the spinneret is triangular, and then water-cooled in a 30°C water bath. Hot roll drawing was carried out at 145°C, the draw ratio was 5 times, and finally heat setting was carried out at 140°C for 1 min to obtain high-strength polypropylene crude fibers.

Example 11.

Step (1). Combine 94g polypropylene, 2g viscose fiber-calcium carbonate-silica compound nucleating agent (viscose fiber: calcium carbonate: silica = 1:5:10), 2g maleic anhydride grafted polymer Propylene, 0.5g acrylic acid grafted polypropylene, 1g antioxidant 168, 0.5g ultraviolet absorber UV-770, mixed into 100g mixture;

Step (2). Add the mixture to the twin-screw extruder for extrusion. The processing temperature of the twin-screw extruder is 145°C in the feeding section, 175°C in the plasticizing section, 205°C in the homogenizing section, and 195°C in the head. The screw speed is 250rpm; then the spinneret is sprayed at 270°C, the die shape of the spinneret is oval, and then water-cooled in a 35°C water bath, hot water drafting is carried out in a 90°C water bath, and the draft ratio is 6 times, and then Hot roll drawing was carried out at 150°C with a draw ratio of 6 times, and finally heat-set at 145°C for 30s to obtain high-strength polypropylene crude fibers.

Example 12.

Step (1). 94g polypropylene, 2g viscose fiber-attapulgite-montmorillonite-calcium carbonate compound nucleating agent (viscose fiber: attapulgite: montmorillonite: calcium carbonate=1:5: 5:5), 1g maleic anhydride grafted polypropylene, 1g glycidyl methacrylate grafted polypropylene, 0.5g acrylic acid grafted polypropylene, 1g antioxidant 168, 0.5g ultraviolet absorber UV-770, mixed into 100g mixture;

Step (2). Add the mixture to the twin-screw extruder for extrusion. The processing temperature of the twin-screw extruder is 150°C in the feeding section, 180°C in the plasticizing section, 205°C in the homogenizing section, and 195°C in the head. The screw speed is 250rpm; then the spinneret is sprayed at 270°C, the shape of the die of the spinneret is circular, and then water-cooled in a 40°C water bath, and hot water drafting is carried out in a 95°C water bath with a draft ratio of 6 times, and then Hot roll drawing was carried out at 150°C with a draw ratio of 6 times, and finally heat-set at 150°C for 15s to obtain high-strength polypropylene crude fibers.

The above embodiments do not limit the present invention, and the present invention is not limited to the above embodiments, as long as the requirements of the present invention are met, they all belong to the protection scope of the present invention. the

Claims (10)

1. a concrete that contains the composite nucleator of viscose strengthens with high-strength polypropylene crude fibre and preparation method thereof, is blend, it is characterized in that this blend comprises polypropylene, nucleator, bulking agent, antioxidant, ultraviolet absorber; Each raw material strengthens at the concrete that contains the composite nucleator of viscose: polypropylene 90～99 ﹪, nucleator 0.1～2.5 ﹪, bulking agent 0.5～5 ﹪, antioxidant 0.1～1.5 ﹪, ultraviolet absorber 0.1～1 ﹪.

2. a kind of concrete that contains the composite nucleator of viscose as claimed in claim 1 strengthens with high-strength polypropylene crude fibre and preparation method thereof, it is characterized in that described polypropylene is the homopolymers of isotacticity >=97 ﹪, and melt index is 3～40g/10min.

3. a kind of concrete that contains the composite nucleator of viscose as claimed in claim 1 strengthens with high-strength polypropylene crude fibre and preparation method thereof, it is characterized in that described nucleator is that organic-inorganic is re-dubbed core agent; It is that 1:20～20:1 forms by organic principle and inorganic constituents according to mass ratio that this organic-inorganic is re-dubbed core agent, and wherein organic principle is viscose acetal fibre, and inorganic constituents is one or more in attapulgite, calcium carbonate, silica, imvite.

4. a kind of concrete that contains the composite nucleator of viscose as claimed in claim 1 strengthens with high-strength polypropylene crude fibre and preparation method thereof, the length that it is characterized in that described viscose is 2～10mm, and viscose fiber monofilament fiber number is 1.1～6.6dtex.

5. a kind of concrete that contains the composite nucleator of viscose as claimed in claim 1 strengthens with high-strength polypropylene crude fibre and preparation method thereof, it is characterized in that described bulking agent is one or more in maleic anhydride inoculated polypropylene, acrylic acid-grafted polypropylene, acrylamide graft polypropylene, methacrylic acid graft polypropylene, glycidyl methacrylate graft polypropylene; The effect of bulking agent is the compatibility improving between inorganic filler and polypropylene, strengthens interface adhesion, improves the mechanical property of material.

6. a kind of concrete that contains the composite nucleator of viscose as claimed in claim 1 strengthens with high-strength polypropylene crude fibre and preparation method thereof, it is characterized in that described antioxidant is a kind of in antioxidant 1010, antioxidant b215, antioxidant 168, antioxidant 1076, antioxidant b225; The effect of antioxidant is to reduce oxidative degradation in crude polypropylene fiber process.

7. a kind of concrete that contains the composite nucleator of viscose as claimed in claim 1 strengthens with high-strength polypropylene crude fibre and preparation method thereof, it is characterized in that described ultraviolet absorber is a kind of in UV-12, UV-326, UV-327, UV-328, UV-329, UV-770, the effect of ultraviolet absorber is the light aging reducing in crude polypropylene fiber use procedure.

8. preparation a kind of concrete that contains the composite nucleator of viscose as claimed in claim 1 strengthens the method with high-strength polypropylene crude fibre and preparation method thereof, it is characterized in that the method comprises the following steps:

Step (1). first nucleator is dried to constant weight, then by polypropylene, nucleator, bulking agent, antioxidant, ultraviolet absorber, is proportionally mixed into compound;

The concrete that contains the composite nucleator of viscose of preparing 100 weight portions strengthens uses high-strength polypropylene crude fibre, and each amount of substance used is: the polypropylene of 90～99 parts, the nucleator of 0.1～2.5 part, the bulking agent of 0.5～5 part, the antioxidant of 0.1～1.5 part, the ultraviolet absorber of 0.1～1 part;

Step (2). compound is extruded by double screw extruder, and by spinnerets spray silk, then through water hot water or cold water drawing-off, hot-rolling drawing-off, HEAT SETTING, obtain high-strength polypropylene crude fibre;

Described polypropylene is the homopolymers of isotacticity >=97 ﹪, and melt index is 3～40g/10min;

Described nucleator is that organic-inorganic is re-dubbed core agent; It is that 1:20～20:1 forms by organic principle and inorganic constituents according to mass ratio that this organic-inorganic is re-dubbed core agent, and wherein organic principle is viscose acetal fibre, and inorganic constituents is one or more in attapulgite, calcium carbonate, silica, imvite;

The length of described viscose is 2～10mm, and viscose fiber monofilament fiber number is 0.7～1.5dtex;

Described bulking agent is one or more in maleic anhydride inoculated polypropylene, acrylic acid-grafted polypropylene, acrylamide graft polypropylene, methacrylic acid graft polypropylene, glycidyl methacrylate graft polypropylene; The effect of bulking agent is the compatibility improving between inorganic filler and polypropylene, strengthens interface adhesion, improves the mechanical property of material;

Described antioxidant is a kind of in antioxidant 1010, antioxidant b215, antioxidant 168, antioxidant 1076, antioxidant b225; The effect of antioxidant is to reduce oxidative degradation in crude polypropylene fiber process;

Described ultraviolet absorber is a kind of in UV-12, UV-326, UV-327, UV-328, UV-329, UV-770, and the effect of ultraviolet absorber is the light aging reducing in crude polypropylene fiber use procedure.

9. a kind of concrete that contains the composite nucleator of viscose as claimed in claim 8 strengthens the preparation method with high-strength polypropylene crude fibre and preparation method thereof, the processing temperature that it is characterized in that described double screw extruder is: 120～150 ℃ of feeding sections, 150～180 ℃ of fluxing zones, 180～205 ℃ of homogenizing zones, 180～195 ℃ of head temperatures, screw speed is 80～250rpm;

The temperature of described spinnerets is 250～270 ℃; Spinnerets mouth mould is shaped as a kind of in circle, ellipse, triangle, square.

10. a kind of concrete that contains the composite nucleator of viscose as claimed in claim 8 strengthens the preparation method with high-strength polypropylene crude fibre and preparation method thereof, it is characterized in that described water-cooled is for the water-bath quenching through 10～40 ℃ by the polymer melt after spray silk, form low-crystallinity polypropylene fibre, be convenient to obtain higher draw ratio and the degree of orientation in stretching;

The bath temperature of described hot water drawing-off is 60～95 ℃, and drawing-off multiplying power is 2～6 times;

The drawing temperature of described hot-rolling drawing-off is 120～150 ℃, and drawing-off multiplying power is 1.5～6 times;

Described heat setting temperature is 110～150 ℃, and the time is 15s～5min.