CN104693590A - Low temperature-resistance polypropylene plastic having good fluidity and preparation method thereof - Google Patents

Abstract

The invention relates to a low temperature-resistance polypropylene plastic having good fluidity and a preparation method thereof. The polypropylene plastic comprises the components of polypropylene, thermoplastic elastomer, micron inorganic particles and white oil, the preparation method comprises the following steps: fully mixing the above components according to proportion, performing melt blending by a double screw extruder, performing extrusion pelletization, and performing injection moulding by an injection machine. The obtained modified polypropylene plastic solves the problem of easy cracking at low temperature of the current polypropylene plastics, and has the advantages of good processing fluidity, and the pretreated attapulgite is capable of obviously increasing the thermostability of the plastic.

Description

A kind of low temperature resistant and acrylic plastering that processing fluidity is good and preparation method thereof

Technical field

The present invention relates to a kind of acrylic plastering, particularly a kind of low temperature resistant, good and acrylic plastering of Heat stability is good and preparation method thereof of processing melt fluidity.

Background technology

Acrylic plastering has excellent mechanical property, and the characteristics such as weathering resistance, insulativity, easily processing, low density, therefore have a wide range of applications in fields such as auto parts machinery, insulating material, chemical industry equipment, material of construction.Polypropylene can normally use usually under normal temperature or comparatively high temps (100 DEG C), but at a lower temperature, easy embrittlement, is particularly very limited when severe cold area outdoor application, after needing that toughening modifying is carried out to it, could as high tenacity structure materials'use.In the past, adopted the chemical process modifications such as random copolymerization, block copolymerization, graft copolymerization, played the effect of tenacity-increased profax to a certain extent, but seldom used as structured material, and cost is higher.Thermoplastic elastomer, as polystyrene-polybutadiene-polystyrene triblock copolymer (SBS), terpolymer EP rubber (EPDM), polyolefin elastomer (POE) etc., there is good toughening effect to polypropylene, but often damage larger to polyacrylic rigidity or tensile strength; And inorganic rigid particle or nanoparticle and polypropene blended, cost is lower, although to the rigidity of material and tensile strength favourable, its toughening effect is limited.Adopt polypropylene/thermoplastic elastomer/nanoparticle blended, i.e. the method for compound modified synergic, can obtain good normal temperature modified effect.Above method of modifying, not obvious to the low temperature toughening effect of material, and lack effective EXPERIMENTS Characterisation methods and prove.

Chinese patent CN101659768 discloses low-temperature impact-resistant composition and method of making the same, and said composition has good shock resistance at 0-40 DEG C, can use as automotive trim, uses under being not suitable for lower temperature again; CN101967247A discloses a kind of medicinal low-temperature-resistant toughening anti-gamma ray impact-resistant transparent polypropylene material and preparation method thereof, by adding ethylene-octene-propylene ternary atactic copolymer, make former homo-polypropylene have good shock resistance, resistance to low temperature, but mechanical property reduce by 5%.

In order to solve the problems of the technologies described above, the present invention is by adding the method for thermoplastic elastomer and the modification of micro inorganic particle cooperative, utilize blending and modifying and filling-modified these two kinds easy, economy, efficient manner to carry out processing modified to acrylic plastering, with obtain that embrittlement point is low, toughness is high, processing fluidity is good and Heat stability is good Novel polypropylene composite base material.

Summary of the invention

The object of this invention is to provide a kind of new acrylic plastering, these plastics have low temperature resistant, not easily embrittlement and the characteristic of Heat stability is good.

Another object of the present invention is to provide a kind of preparation method of above-mentioned acrylic plastering, and this preparation method's technique is simple, and cost is low, processing fluidity good.

To achieve these goals, the present invention realizes as follows: acrylic plastering of the present invention comprises polypropylene, thermoplastic elastomer, micro inorganic particle and white oil four kinds of components; The content (by percentage to the quality) of various component is:

Described each component ratio can be optimized for:

Described thermoplastic elastomer comprises the one in polystyrene-polybutadiene-polystyrene triblock copolymer (SBS), terpolymer EP rubber (EPDM), polyolefin elastomer (POE).

Described micro inorganic particle comprises the one in the modified attapulgite of pretreated attapulgite, organic modifiers, calcium carbonate, and wherein organic modifiers comprises the one in cetyl trimethylammonium bromide (CTAB), sodium laurylsulfonate (SLS), sodium lauryl sulphate (being also Sodium Lauryl Sulphate BP/USP SLS).

Low temperature resistant polyacrylic preparation method of the present invention carries out in the steps below:

1) attapulgite pre-treatment: washing → drying → hcl acidifying → drying (called after AT);

2) Organic Surface Modification of Attapulgite: pretreated attapulgite (AT) → organic modifiers modification → drying (called after OAT);

3) take above-mentioned polypropylene granules in proportion, polyolefin elastomer pellet, micro inorganic particle, white oil carry out high-speed mixing (rotating speed 3000 turns/min stirs 10min), make micro inorganic uniform particle be stained with pellet surface;

4) use twin screw extruder extruding pelletization, wherein forcing machine one district temperature is: 170 ~ 190 DEG C; 2nd district: 180 ~ 200 DEG C; 3rd district: 190 ~ 220 DEG C; 4th district: 200 ~ 220 DEG C; 5th district: 0 DEG C; 6th district: 220 ~ 250 DEG C.For subsequent use after the pellet vacuum-drying of making;

5) with injection moulding machine, dried pellet is injection molded into dumbbell shape or rectangle batten.

The present invention has following Advantageous Effects: low temperature resistant, and processing fluidity is good, Heat stability is good, prepares simply and low cost and other advantages.

Embodiment:

Attapulgite is through pre-treatment called after AT; Again through native called after OAT that organic modifiers is modified.

Embodiment 1:

Take polypropylene granules 74 parts, polyolefin elastomer (POE) pellet 22 parts, through pretreated 4 parts, AT soil, drip white oil 3-5 part; High-speed mixing, makes AT soil adhere to pellet surface; Through extruding pelletization, dry, injection moulding.

Embodiment 2:

Take polypropylene granules 74 parts, polystyrene-polybutadiene-polystyrene triblock copolymer (SBS) pellet 22 parts, pretreated 4 parts, AT soil, drips white oil 3-5 part; High-speed mixing, makes AT soil adhere to pellet surface; Through extruding pelletization, dry, injection moulding.

Embodiment 3:

Take polypropylene granules 74 parts, polyolefin elastomer (POE) pellet 22 parts, through 4 parts, the OAT soil that organically-modified machine cetyl trimethylammonium bromide (CTAB) is modified, drip white oil 3-5 part; High-speed mixing, makes OAT soil adhere to pellet surface; Through extruding pelletization, dry, injection moulding.

Embodiment 4:

Take polypropylene granules 74 parts, polyolefin elastomer (POE) pellet 22 parts, calcium carbonate powders 4 parts, drip white oil 3-5 part; High-speed mixing, makes calcium carbonate adhere to pellet surface; Through extruding pelletization, dry, injection moulding.

Claims (6)

1. a low temperature resistant acrylic plastering, is characterized in that: it comprises polypropylene granules, thermoplastic elastomer, micro inorganic particle, white oil four components; The ratio that each component accounts for total mass is in mass ratio:

2. according to a kind of low temperature resistant acrylic plastering according to claim 1, it is characterized in that: the ratio that each component accounts for total mass is in mass ratio:

3., according to a kind of low temperature resistant acrylic plastering described in claim 1, wherein inorganic particulate comprises the one in the modified attapulgite of pretreated attapulgite, organic modifiers, calcium carbonate.

4. the organic modifiers adopted according to the attapulgite that the organic modifiers described in claim 3 is modified comprises the one in cetyl trimethylammonium bromide (CTAB), sodium laurylsulfonate (SDS), sodium lauryl sulphate (being also Sodium Lauryl Sulphate BP/USP SLS).

5. comprise the one in polystyrene-polybutadiene-polystyrene triblock copolymer (SBS), terpolymer EP rubber (EPDM), polyolefin elastomer (POE) according to the thermoplastic elastomer in claim 1.

6. a preparation method for low temperature resistant acrylic plastering, is characterized in that: its preparation method carries out in the steps below:

1) attapulgite pre-treatment: water Shen → drying → hcl acidifying → drying (called after AT);

2) Organic Surface Modification of Attapulgite: pretreated attapulgite (AT) → organic modifiers modification → drying (called after OAT);

3) take raw material in the ratio described in claim 1, mix (rotating speed 3000 turns/min stirs 10min);

4) dual-screw-stem machine extruding pelletization is used;

5) by dry for the pellet made;

6) with injection moulding machine by dried pellet injection moulding.