CN104177747A - Modified plastic and preparation method thereof - Google Patents

Abstract

The invention provides a modified high-impact polystyrene plastic. On the basis of high-impact polystyrene, a toughener, a lubricant, a filler and the like are added and subjected to blending and extrusion to enhance the performance of the high-impact polystyrene. The packing box product has the advantages of excellent strength, excellent rigidity, excellent air tightness and the like. The modified plastic is prepared from 55-65% of high-impact polystyrene, 15-25% of toughener, 3-5% of ground calcium carbonate, 7-11% of nano filler, 3-5% of plasticizer, 0.1-0.3% of antioxidant, 0.1-0.2% of antistatic agent, 0.2-0.4% of lubricant and 0.7-0.9% of toner.

Description

A kind of modified plastics and preparation method thereof

Technical field

The present invention relates to the modification field of engineering plastics, mainly relate to the modification application of Hips Plastics.

Background technology

The modification of at present general high-impact polystyrene is mainly to improve its low temperature brittleness by adding toughner, thereby improves its shock strength, the civil areas such as the extensive utilization of its goods and household electrical appliances, automobile, toy.

Militaryl package goods, due to its special application scenario, require it to adapt to severe environment, still ensure the performances such as its intensity, rigidity, resistance to air loss under high temperature severe cold.For example, Militaryl package need to meet every requirement of experiment, the 5.13 solar radiation tests etc. such as 5.2 anti-electrostatic tests, 5.3 stacking tests, 5.4500km transport by road test, 5.7 free fall tests, 5.10 high low temperature storage tests, 5.11 damp and hot shelf tests, 5.12 rainfall tests in GJB4403 ?2002.

Chinese patent literature (20051001054.3 " a kind of military goods are special engineering plastics dedicated ") has disclosed a kind of engineering plastics, taking common HIPS resin as main raw, by adding impact modified macromolecular material to react with it or adding properties-correcting agent to carry out blend in matrix resin, adopt EPDM+SBS technology to improve.Its concrete preparation technology is: first complete the preparation of low-temperature impact properties-correcting agent by twin screw extruder, then adopt expressing technique of high speed pre-mixing and dispersing, by HIPS resin, low-temperature impact properties-correcting agent, oxidation inhibitor, processing aid after high-speed mixer dispersing and mixing, by twin screw extruder melting again, mixing, extrude, cooling, dry, pelletizing, packaging.

The scheme of above-mentioned patent documentation, has summarized the general modification method for preparing of high-impact polystyrene, and this basic production technique theory, does not relate to the concrete component of modified plastics and proportioning thereof, is still difficult to conscientiously solve the problems such as intensity, rigidity, resistance to air loss; For the indices requirement of modified plastics Militaryl package goods, be still difficult to up to standard.

Summary of the invention

The present invention proposes a kind of modified high impact resistant polystyrene plastics, on the basis of high-impact polystyrene, by adding toughner, lubricant, weighting agent, etc. blending extrusion improve the performance of high-impact polystyrene, its tr goods have the performances such as good intensity, rigidity, resistance to air loss.

General planning of the present invention is:

This modified plastics, comprises following feed composition:

Above proportioning is mass percent.

Based on above formula, according to application needs, can also add again the raw material with other functions, such as fire retardants etc., can certainly add some conventional auxiliary materials.

Above-mentioned toughner optimization styrene butadiene block copolymer (SBS).

The preferred clorafin of softening agent and o-phthalic acid dibutyl ester (DOP), both mass ratioes are 20:1.

The preferred pentaerythritol tetrathioglycollate of oxidation inhibitor and Tyox B, both mass ratioes are 1:1～3.

Nano-sized filler can be selected nano-calcium carbonate conventionally.

Static inhibitor optimization ethylene oxide amine affixture.

The preferred ethylene stearylamide of lubricant (EBA) or ethylene bis stearamide (EBS).

For Militaryl package goods, above-mentioned toner can adopt the mixing of phthalein viridescent, carbon black and chrome yellow conventionally.

The present invention also provides a kind of method of preparing this modified plastics, comprises the following steps:

(1) water-ground limestone, static inhibitor, oxidation inhibitor, lubricant and toner are mixed, obtain Preblend;

(2) Preblend step (1) being obtained and high-impact polystyrene, toughner, softening agent and nano-sized filler, fully mix through high-speed mixer, then through parallel double-screw extruder once shaped granulation; The temperature of the each section of parallel double-screw extruder should be controlled in the scope of 175 ± 30 DEG C.

The present invention has further done important optimization to this preparation method, wherein: step (1) is to add successively water-ground limestone, static inhibitor, and 1400～1500r/min stirs 1 minute at a high speed, then adds oxidation inhibitor and toner, low speed 700～800r/min stirs 15 seconds again, mixes.Step (2) is in another mixing equipment, to add successively toughner and lubricant to stir 15～35 seconds, then add the Preblend mix and blend 15～35 seconds that high-impact polystyrene, nano-sized filler and step (1) obtain, until mix.

The present invention has following beneficial effect:

The present invention is applicable to tr, cylinder, material equipment packaging case of the big-and-middle-sized bore shell of my army etc., and reliable product quality, superior performance, for national Defence business provides solid guarantee.In addition, the modified plastics of our company research and development is equally applicable to the plastics of civil area, for example, and the extranal packing box of high-grade precision instrument, the outdoor appliances of some weathering resistance and replace some steel etc.

Embodiment

The present invention is taking high-impact polystyrene as carrier base material, and with toughner, nano-sized filler, oxidation inhibitor, static inhibitor, softening agent, lubricant, toner etc. are after high-speed mixer mixes, through an extrusion moulding of twin screw extruder.

First list to prepare the required better raw material of this modified plastics below.Wherein:

High-impact polystyrene (HIPS): specifically can adopt the Zhenjiang Qi Mei Chemical Co., Ltd. trade mark is the high-impact polystyrene that HIPS888G or the Nanjing BASF AG trade mark are 476L, and optimal selection is the high-impact polystyrene that the Zhenjiang Qi Mei company trade mark is 888G.

Toughner: the trade mark that specifically can adopt Sinopec Ba Ling petrochemical industry branch office is 1301 or 1401 SBS.The optimal selection trade mark is 1301 SBS.

Nano-sized filler: specifically can adopt the nano-filled modified master of Baoji Yunpeng Plastic Science and Technology Co., Ltd., its main component is nano-calcium carbonate.

Oxidation inhibitor: specifically can adopt bright Chemical Co., Ltd. of the Nanjing Holley trade mark is 1010 and the oxidation inhibitor of DLPT, and its main component is respectively pentaerythritol tetrathioglycollate and Tyox B.In industry, conventionally mix and use according to mass ratio 1:3, the present invention determines that through testing 1:1 is best proportioning.

Static inhibitor: specifically can adopt bright Chemical Co., Ltd. of the Nanjing Holley trade mark be HB ?2 static inhibitor, its main component is oxyethane amine affixture.

Softening agent: specifically can adopt Chang Ling, the Xi'an welfare chemical industry trade mark is the clorafin of 52 DEG C and the misery fat of O-phthalic (DOP) of Xi'an Ming Hao Chemical Co., Ltd., mixes and uses according to mass ratio 20:1.

Lubricant: ethylene stearylamide (EBA) or the ethylene bis stearamide (EBS) that specifically can adopt Jilin Petrochemical Company of CNPC.

Toner: phthalein viridescent, carbon black, the chrome yellow that specifically can adopt Beijing dyeing factory.

The content ratio of each component:

In more than filling a prescription, high-impact polystyrene, toughner, nano-sized filler are as main ingredient, its proportion relation has determined the salient features of modified plastics, toughner is mainly used to change toughness, and being added in of nano-sized filler ensures under enough toughness prerequisites to have improved its intensity, improved formability simultaneously; In conjunction with the special optimization design of oxidation inhibitor and other components, finally make modified plastics there is excellent overall performance.

Production technique of the present invention, comprises the following steps:

(1) 300 order water-ground limestones, static inhibitor, oxidation inhibitor and toner are mixed to pre-mixing through high-speed mixer;

(2) Preblend (1) step being obtained in high-impact polystyrene, toughner, nano-sized filler, softening agent after high-speed mixer fully mixes through parallel double-screw extruder once shaped granulation (temperature of the each section of parallel double-screw extruder should be controlled in the scope of 175 ± 30 DEG C).

Step (1) is to add successively water-ground limestone, static inhibitor, and 1400～1500r/min stirs 1 minute at a high speed, then adds oxidation inhibitor and toner low speed 700～800r/min to stir 15 seconds, mixes.

Step (2) is in another mixing equipment, to add successively toughner and lubricant to stir 15～35 seconds, then add the Preblend mix and blend 15～35 seconds that high-impact polystyrene, nano-sized filler and step (1) obtain, until mix.

The special temperature control of paying attention to the time of twice batch mixing, reinforced order and extruding pelletization of this production technique.

The over-all properties of expecting for characterizing the present invention, following table 1 has been set up higher design parameter index request.

Table 1

Below list several groups of specific exampless, table 2 is each component proportion (more than random selection concrete reagent), and table 3 is corresponding situation up to standard.

Table 2

Table 3

As can be seen from Table 3, respectively organize embodiment all up to standard.It should be noted that, in the time of the simple beam impact strength of testing under 50 DEG C of conditions of high temperature, according to GB/T1043 ?1993 test results that obtain be divided into C (completely destroy), H (hinge destruction), P (partial destruction) and N and (do not destroy, i.e. not fracture), wherein, in the time that test result belongs to N, do not record concrete data.For this modified plastics, " not fracture " this state shows that its resistance to impact shock performance is fine, and its True Data must be greater than 23.5, is therefore considered as up to standard.

Claims (10)

1. a modified plastics, comprises following feed composition:

Above proportioning is mass percent.

2. modified plastics according to claim 1, is characterized in that: described toughner adopts styrene butadiene block copolymer (SBS).

3. modified plastics according to claim 1, is characterized in that: described softening agent adopts clorafin and o-phthalic acid dibutyl ester (DOP), and both mass ratioes are 20:1.

4. modified plastics according to claim 1, is characterized in that: described oxidation inhibitor adopts pentaerythritol tetrathioglycollate and Tyox B, and both mass ratioes are 1:1～3.

5. modified plastics according to claim 1, is characterized in that: described nano-sized filler adopts nano-calcium carbonate.

6. modified plastics according to claim 1, is characterized in that: described static inhibitor adopts oxyethane amine affixture.

7. modified plastics according to claim 1, is characterized in that: described lubricant adopts ethylene stearylamide (EBA) or ethylene bis stearamide (EBS).

8. modified plastics according to claim 1, is characterized in that: described toner adopts phthalein viridescent, carbon black, chrome yellow.

9. a kind of method of modified plastics described in preparation claim 1, comprises the following steps:

(1) water-ground limestone, static inhibitor, oxidation inhibitor, lubricant and toner are mixed, obtain Preblend;

(2) Preblend step (1) being obtained and high-impact polystyrene, toughner, softening agent and nano-sized filler, fully mix through high-speed mixer, then through parallel double-screw extruder once shaped granulation; The temperature of the each section of parallel double-screw extruder should be controlled in the scope of 175 ± 30 DEG C.

10. method according to claim 9, is characterized in that:

Step (1) is to add successively water-ground limestone, static inhibitor, and 1400～1500r/min stirs 1 minute at a high speed, then adds oxidation inhibitor and toner, stirs 15 seconds at 700～800r/min, mixes;

Step (2) is in another mixing equipment, to add successively toughner and lubricant to stir 15～35 seconds, then add the Preblend mix and blend 15～35 seconds that high-impact polystyrene, nano-sized filler and step (1) obtain, until mix.