CN110776701A - Modified polystyrene plastic for plastic bead ornaments and preparation method thereof - Google Patents

Abstract

The invention discloses a modified polystyrene plastic used for plastic bead ornaments and a preparation method thereof. The mass percentage of each component calculated by weight is as follows: take 50-90 parts of polystyrene pellets, add 10-50 parts A total of 100 parts of toughening agent, 10-50 parts of inorganic filler, 2-3 parts of plasticizer, 0.1-1 part of antioxidant, 0.5-1.5 part of heat stabilizer, 0.5-1.5 part of fluorescent whitening agent , 1~2 copies of coupling agent. Among them, tougheners can effectively improve the toughness and impact strength of polystyrene plastics, inorganic fillers can reduce the price of finished products, plasticizers can improve the plastic processing properties of raw materials, antioxidants can prevent thermal oxidative aging during processing, The coupling agent is used to increase the compatibility of the organic phase with the inorganic filler. The modified polystyrene plastic has good toughness and impact strength, and its impact strength is greater than 120J/m, which meets the performance requirements of plastic beads. The technological process is simple, the operation is simple, the requirements for equipment are low, and commercial production is easy to be realized; meanwhile, the raw materials are cheap and easy to obtain, have high economic benefits, and are suitable for the processing and production of plastic bead ornaments.

Description

A kind of modified polystyrene plastic for plastic bead ornament and preparation method thereof

technical field

The invention relates to a modified polystyrene plastic used for plastic bead ornaments and a preparation method thereof, belonging to the technical field of modified plastics.

Background technique

Polystyrene is a general-purpose thermoplastic resin that is colorless, odorless, and tasteless transparent crystals at room temperature. It is an organic polymer synthesized by free radical addition polymerization of styrene monomer. As one of the five most widely used synthetic resins today, polystyrene has many advantages, such as high transparency, high hardness, strong rigidity, heat resistance, corrosion resistance, easy dyeing, low moisture absorption, low price, easy processing, etc. . Therefore, in today's production and life, it is widely used in toys, packaging, automobiles, instruments, electronics, home appliances, furniture, construction, medical care, shoes, daily necessities and other fields. Polystyrene has become the fourth largest general-purpose resin material besides polyethylene, polyvinyl chloride and polypropylene. Polystyrene resin can be seen everywhere in our daily life, and its application fields are constantly extending and expanding.

Polystyrene is classified according to its strength properties, and it can usually be divided into three categories: general-purpose polystyrene (referred to as GPPS), expanded polystyrene (referred to as EPS) and high-impact polystyrene (referred to as HIPS). General-purpose polystyrene (GPPS) is a non-ductile, colorless and transparent material with many shortcomings such as brittleness, easy cracking, heat resistance, and low strength; in order to solve these shortcomings, improve the performance of polystyrene In recent decades, a series of modified new varieties of polystyrene have been developed by copolymerizing styrene with different monomers, or blending homopolymers and copolymers. Among them, high-impact polystyrene (HIPS) is the product of graft copolymerization of monomer styrene and butadiene rubber. HIPS has better strength and toughness, and has a wider range of applications. Expanded polystyrene (EPS) is made by adding a blowing agent (usually pentane) to ordinary polystyrene, which is heated to foam during processing to make foam. In the global production of polystyrene series resins, high impact (HIPS) accounts for about one-third, general-purpose polystyrene (GPPS) accounts for about half, and other varieties account for the remaining share. In developed countries, the production of high-impact polystyrene is relatively large, and HIPS accounts for more than half of the total production of polystyrene in North America.

Traditional polystyrene plastic products have extremely high transparency, easy coloring, good processing performance and good corrosion resistance. However, traditional polystyrene plastics also have many shortcomings, such as brittleness, low impact strength, and easy stress cracking. These shortcomings greatly limit the application range of polystyrene plastics. At present, the preparation of modified polystyrene plastics at home and abroad mostly uses additives to improve its mechanical properties and thermal properties. Although the material properties have been improved, the cost of raw materials has also increased. Therefore, in this paper, the modified polystyrene plastics are blended and modified by using inorganic fillers, so as to improve the properties of polystyrene plastics and reduce the cost of raw materials.

At present, the patent application publication number CN104945761A discloses a preparation method of modified polystyrene plastic, which consists of polystyrene plastic, thermoplastic elastomer EPDM rubber, toughener liquid acrylate rubber, impact modified Agent methyl methacrylate-butadiene-styrene copolymer, heat stabilizer di-n-octyl tin maleate, high temperature resistant agent polybenzimidazole, dispersant polyvinyl alcohol 200. The modified polystyrene plastic prepared by the method has the characteristics of good toughness, high impact strength, good thermal stability, high temperature resistance and not easy to crack, but the raw materials are complex and expensive, the production cost is high, and the economic benefit is not obvious.

Secondly, the patent application publication number CN106674785A discloses a method for preparing a modified polystyrene plastic film, which is melt-blended with boron nitride, polystyrene, EPDM, and a solubilizer. Polystyrene: EPDM rubber: boron nitride = 10:1:0.55~3.3 mixed in a double drum mixer. The preparation process of the method is simple, environmentally friendly, and the obtained polystyrene plastic has high toughness and thermal conductivity. However, the production cost is still high, the thermal stability is insufficient, it is easy to be oxidized, and the service life is short.

Finally, the patent application publication number CN107446256A discloses a toughened polystyrene filler masterbatch and a preparation method thereof, comprising 14 to 20 parts of polystyrene, 80 to 90 parts of modified bentonite, and 4 parts of dioctyl phthalate. ~8 parts, 3-5 parts of Fischer-Tropsch wax, 12-15 parts of butyl rubber, 3.2-3.5 parts of phosphate coupling agent for blending modification. The modified polystyrene plastic prepared by the method is filled with a large amount of bentonite, and the addition of the auxiliary agent makes it have a good dispersion in the polystyrene, the production cost is reduced, and the mechanical properties of the material are improved. However, the process is complicated, and the obtained modified polystyrene plastic has strong rigidity and is brittle. It greatly limits the scope of its application.

Therefore the preparation of traditional modified polystyrene plastics. Although material properties have improved, raw material costs have also increased. Modified polystyrene plastics are modified by blending with inorganic fillers, so that the cost of raw materials can be reduced while improving the properties of polystyrene plastics.

SUMMARY OF THE INVENTION

In order to solve the above problems existing in the prior art, the present invention provides a modified polystyrene plastic for plastic bead ornaments and a preparation method thereof. Agents, antioxidants, thermal stabilizers, lubricants, coupling agents, and optical brighteners make the modified polystyrene plastics have the advantages of low price, good toughness, high impact strength, good thermal stability, and long service life. length and other characteristics.

A modified polystyrene plastic for plastic bead ornaments is made from the following raw materials in parts by weight:

10~50 parts polystyrene pellets, 50~90 parts toughening agent, 10~50 parts inorganic filler, 2~3 parts plasticizer, 0.1~1 part antioxidant, 0.5~1.5 part heat stabilizer, fluorescent 0.5-1.5 parts of whitening agent and 1-2 parts of coupling agent; the total amount of the polystyrene pellets and the toughening agent is 100 parts.

Further, the toughening agent is EPDM rubber powder.

Further, the inorganic filler is 325-mesh light calcium carbonate powder that has undergone high temperature dewatering treatment.

Further, the plasticizer is a phthalate.

Further, the antioxidant is antioxidant 1010.

Further, the heat stabilizer is calcium stearate, which also functions as a lubricant and heat stabilizer.

Further, the coupling agent is a titanate coupling agent.

The present invention also relates to a method for preparing a modified polystyrene plastic for plastic bead ornaments, comprising the following steps:

(1) 10-50 parts by weight of polystyrene pellets, 50-90 parts by weight of toughening agent, 10-50 parts by weight of inorganic filler, 2-3 parts by weight of plasticizer, 0.1-1 part by weight of antioxidant, 0.5-1.5 parts by weight of heat stabilizer and 0.5-1.5 parts by weight of fluorescent whitening agent are added in a high-speed mixer and mixed for 15 minutes, then 1-2 parts by weight of titanate coupling agent are added, and the mixing is continued for 5 minutes;

(2) blending, extruding and granulating the mixed material prepared in step (1) with a twin-screw extruder, the extrusion temperature is 190-200°C, and the screw speed is 200r/mim;

(3) The mixed material used after the treatment in step (2) is re-blended, extruded and pelletized with a twin-screw extruder; the extrusion temperature is 190-200 ° C, and the screw speed is 200 r/mim .

The present invention has the following beneficial effects:

(1) The present invention provides a modified polystyrene resin and a preparation method thereof. EPDM rubber is added to the blending system to enhance the elasticity of the material. The prepared modified polystyrene resin has good toughness and impact strength.

(2) The modified polystyrene plastic prepared by the present invention uses 325 mesh light calcium carbonate as an inorganic filler for blending modification. economic benefits.

(3) The present invention provides a modified polystyrene resin and a preparation method thereof. The extrusion temperature of the twin-screw extruder is 190-200° C., and the screw speed is 200 r/mim. Blending, extrusion, and granulation were performed twice. The technology is mature, the operation is simple, the requirements for equipment are low, and it is easy to realize.

Detailed ways

The following are several embodiments of the present invention to further illustrate the present invention, but the present invention is not limited thereto.

Example 1:

A method for preparing a modified polystyrene plastic for plastic bead ornaments, comprising the proportions of components calculated by weight: 60 parts of the polystyrene plastic, and 40 parts of the EPDM rubber as the toughening agent , the inorganic filler is 30 parts of light calcium carbonate, the plasticizer is 2 parts of phthalate, the antioxidant 1010 is 0.1 part, and the heat stabilizer is 0.5 part of calcium stearate , 0.5 part of the fluorescent whitening agent.

The preparation method of the above-mentioned modified polystyrene plastic comprises the following steps. First, each component is weighed according to the above-mentioned formula, and the polystyrene pellets, EPDM rubber, light calcium carbonate, phthalate , Antioxidant 1010, calcium stearate and fluorescent whitening agent were added and mixed in a high-speed mixer for 15min and mixed at a high speed for 15min. Add 1 part of the titanate coupling agent, and continue to mix for 5 min. Then, the mixed materials are mixed, extruded and pelletized once by SHJ-36 twin-screw extruder produced by Nanjing Chengmeng Chemical Machinery Co., Ltd. Finally, the prepared plastic granules are then subjected to secondary blending, extrusion and granulation with a twin-screw extruder to obtain modified polystyrene plastics. The mechanical properties of the obtained samples were tested, and the tensile strength was 17.5MPa and the elongation at break was 36% measured by the WDW-20 electronic universal testing machine produced by Shenzhen Kaiqiangli Machinery Co., Ltd. The impact strength measured by the XJJ-5 simply supported beam impact testing machine is 173.4J/m.

Embodiment 2:

A method for preparing a modified polystyrene plastic for plastic bead ornaments, comprising the proportions of components calculated by weight: 60 parts of the polystyrene plastic, and 40 parts of the EPDM rubber as the toughening agent , the inorganic filler is 40 parts of light calcium carbonate, the plasticizer is 2 parts of phthalate, the antioxidant 1010 is 0.1 part, and the heat stabilizer is 0.5 part of calcium stearate , 0.5 part of the fluorescent whitening agent.

The preparation method of the above-mentioned modified polystyrene plastic comprises the following steps. First, each component is weighed according to the above-mentioned formula, and the polystyrene pellets, EPDM rubber, light calcium carbonate, phthalate , Antioxidant 1010, calcium stearate and fluorescent whitening agent were added and mixed in a high-speed mixer for 15min and mixed at a high speed for 15min. Add 1 part of the titanate coupling agent, and continue to mix for 5 min. Then, the mixed materials are mixed, extruded and pelletized once by SHJ-36 twin-screw extruder produced by Nanjing Chengmeng Chemical Machinery Co., Ltd. Finally, the prepared plastic granules are then subjected to secondary blending, extrusion and granulation with a twin-screw extruder to obtain modified polystyrene plastics. The mechanical properties of the obtained samples were tested, and the tensile strength was 15.5MPa and the elongation at break was 17% using the WDW-20 electronic universal testing machine produced by Shenzhen Kaiqiangli Machinery Co., Ltd. The impact strength measured by the XJJ-5 simply supported beam impact testing machine is 161.2J/m.

Embodiment three:

A method for preparing a modified polystyrene plastic for plastic bead ornaments, comprising the proportions of components calculated by weight: 60 parts of the polystyrene plastic, and 40 parts of the EPDM rubber as the toughening agent , the inorganic filler is 50 parts of light calcium carbonate, the plasticizer is 2 parts of phthalate, the antioxidant 1010 is 0.1 part, and the heat stabilizer and heat stabilizer are stearin 0.5 part of calcium acid, 0.5 part of the fluorescent whitening agent.

The preparation method of the above-mentioned modified polystyrene plastic comprises the following steps. First, each component is weighed according to the above-mentioned formula, and the polystyrene pellets, EPDM rubber, light calcium carbonate, phthalate , Antioxidant 1010, calcium stearate and fluorescent whitening agent were added and mixed in a high-speed mixer for 15min and mixed at a high speed for 15min. Add 1 part of the titanate coupling agent, and continue to mix for 5 min. Then, the mixed materials are mixed, extruded and pelletized once by SHJ-36 twin-screw extruder produced by Nanjing Chengmeng Chemical Machinery Co., Ltd. Finally, the prepared plastic granules are then subjected to secondary blending, extrusion and granulation with a twin-screw extruder to obtain modified polystyrene plastics. The obtained samples were tested for mechanical properties. The tensile strength was 14.9MPa and the elongation at break was 9% measured by the WDW-20 electronic universal testing machine produced by Shenzhen Kaiqiangli Machinery Co., Ltd. The impact strength measured by the XJJ-5 simply supported beam impact testing machine is 125.6J/m.

Embodiment 4:

A method for preparing a modified polystyrene plastic for plastic bead ornaments, comprising the proportions of components calculated by weight: 55 parts of the polystyrene plastic, and 45 parts of the EPDM rubber as the toughening agent , the inorganic filler is 30 parts of light calcium carbonate, the plasticizer is 2 parts of phthalate, the antioxidant 1010 is 0.1 part, the heat stabilizer, heat stabilizer and lubricant It is 0.5 part of calcium stearate and 0.5 part of the fluorescent whitening agent.

The preparation method of the above-mentioned modified polystyrene plastic comprises the following steps. First, each component is weighed according to the above-mentioned formula, and the polystyrene pellets, EPDM rubber, light calcium carbonate, phthalate , Antioxidant 1010, calcium stearate and fluorescent whitening agent were added and mixed in a high-speed mixer for 15min and mixed at a high speed for 15min. Add 1 part of the titanate coupling agent, and continue to mix for 5 min. Then, the mixed materials are mixed, extruded and pelletized once by SHJ-36 twin-screw extruder produced by Nanjing Chengmeng Chemical Machinery Co., Ltd. Finally, the prepared plastic granules are then subjected to secondary blending, extrusion and granulation with a twin-screw extruder to obtain modified polystyrene plastics. The obtained samples were tested for mechanical properties. The tensile strength was 16.0MPa and the elongation at break was 65% measured by the WDW-20 electronic universal testing machine produced by Shenzhen Kaiqiangli Machinery Co., Ltd., which was produced by Hebei Chengde Testing Machine Factory. The impact strength measured by the XJJ-5 simply supported beam impact testing machine is 220.3J/m.

Embodiment 5:

A method for preparing a modified polystyrene plastic for plastic bead ornaments, comprising the proportions of components calculated by weight: 55 parts of the polystyrene plastic, and 45 parts of the EPDM rubber as the toughening agent , the inorganic filler is 40 parts of light calcium carbonate, the plasticizer is 2 parts of phthalate, the antioxidant 1010 is 0.1 part, the heat stabilizer, heat stabilizer and lubricant It is 0.5 part of calcium stearate and 0.5 part of the fluorescent whitening agent.

The preparation method of the above-mentioned modified polystyrene plastic comprises the following steps. First, each component is weighed according to the above-mentioned formula, and the polystyrene pellets, EPDM rubber, light calcium carbonate, phthalate , Antioxidant 1010, calcium stearate and fluorescent whitening agent were added and mixed in a high-speed mixer for 15min and mixed at a high speed for 15min. Add 1 part of the titanate coupling agent, and continue to mix for 5 min. Then, the mixed materials are mixed, extruded and pelletized once by SHJ-36 twin-screw extruder produced by Nanjing Chengmeng Chemical Machinery Co., Ltd. Finally, the prepared plastic granules are then subjected to secondary blending, extrusion and granulation with a twin-screw extruder to obtain modified polystyrene plastics. The mechanical properties of the obtained samples were tested, and the tensile strength was 15.8MPa and the elongation at break was 39% measured by the WDW-20 electronic universal testing machine produced by Shenzhen Kaiqiangli Machinery Co., Ltd. The impact strength measured by XJJ-5 simply supported beam impact testing machine is 179.5J/m.

Embodiment 6:

A method for preparing a modified polystyrene plastic for plastic bead ornaments, comprising the proportions of components calculated by weight: 55 parts of the polystyrene plastic, and 45 parts of the EPDM rubber as the toughening agent , the inorganic filler is 50 parts of light calcium carbonate, the plasticizer is 2 parts of phthalate, the antioxidant 1010 is 0.1 part, the heat stabilizer, heat stabilizer and lubricant It is 0.5 part of calcium stearate and 0.5 part of the fluorescent whitening agent.

The preparation method of the above-mentioned modified polystyrene plastic comprises the following steps. First, each component is weighed according to the above-mentioned formula, and the polystyrene pellets, EPDM rubber, light calcium carbonate, phthalate , Antioxidant 1010, calcium stearate and fluorescent whitening agent were added and mixed in a high-speed mixer for 15min and mixed at a high speed for 15min. Add 1 part of the titanate coupling agent, and continue to mix for 5 min. Then, the mixed materials are mixed, extruded and pelletized once by SHJ-36 twin-screw extruder produced by Nanjing Chengmeng Chemical Machinery Co., Ltd. Finally, the prepared plastic granules are then subjected to secondary blending, extrusion and granulation with a twin-screw extruder to obtain modified polystyrene plastics. The mechanical properties of the obtained samples were tested, and the tensile strength was 13.9MPa and the elongation at break was 17% using the WDW-20 electronic universal testing machine produced by Shenzhen Kaiqiangli Machinery Co., Ltd., which was produced by Hebei Chengde Testing Machine Factory. The impact strength measured by the XJJ-5 simply supported beam impact testing machine is 135.1J/m.

The above descriptions are only the embodiments of the present invention, and do not limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description of the present invention, or directly or indirectly applied in other related technical fields, will not limit the scope of the invention. Similarly, it is included in the scope of patent protection of the present invention.

Claims (8)

1. The modified polystyrene plastic for the plastic bead ornaments is characterized by being prepared from the following raw materials in parts by weight:

50-90 parts of polystyrene granules, 10-50 parts of a toughening agent, 10-50 parts of an inorganic filler, 2-3 parts of a plasticizer, 0.1-1 part of an antioxidant, 0.5-1.5 parts of a heat stabilizer, 0.5-1.5 parts of a fluorescent whitening agent and 1-2 parts of a coupling agent; the total amount of the polystyrene granules and the toughening agent is 100 parts.

2. The modified polystyrene plastic for plastic bead ornaments as claimed in claim 1, wherein: the toughening agent is ethylene propylene diene monomer rubber powder.

3. The modified polystyrene plastic for plastic bead ornaments as claimed in claim 1, wherein: the inorganic filler is light calcium carbonate powder which is processed by 325 meshes and high-temperature dehydration.

4. The modified polystyrene plastic for plastic bead ornaments as claimed in claim 1, wherein: the plasticizer is phthalate.

5. The modified polystyrene plastic for plastic bead ornaments as claimed in claim 1, wherein: the antioxidant is antioxidant 1010.

6. A modified polystyrene plastic for plastic bead ornaments as claimed in claim 2, wherein: the heat stabilizer is calcium stearate.

7. The modified polystyrene plastic for plastic bead ornaments as claimed in claim 1, wherein: the coupling agent is a titanate coupling agent.

8. A preparation method of modified polystyrene plastic for plastic bead ornaments is characterized by comprising the following steps:

(1) adding 10-50 parts by weight of polystyrene granules, 50-90 parts by weight of a toughening agent, 10-50 parts by weight of an inorganic filler, 2-3 parts by weight of a plasticizer, 0.1-1 part by weight of an antioxidant, 0.5-1.5 parts by weight of a heat stabilizer and 0.5-1.5 parts by weight of a fluorescent brightener into a high-speed mixer, mixing for 15min, adding 1-2 parts by weight of a titanate coupling agent, and continuously mixing for 5 min;

(2) blending, extruding and granulating the mixed material prepared in the step (1) by using a double-screw extruder, wherein the extrusion temperature is 190-200 ℃, and the screw rotating speed is 200 r/mim;

(3) carrying out secondary blending, extrusion and granulation on the mixed material treated in the step (2) by using a double-screw extruder; the extrusion temperature is 190-200 ℃, and the rotating speed of the screw is 200 r/mim.