阅读说明：本技术 塑胶改性材料及其制备方法 (plastic modified material and preparation method thereof ) 是由 周吉明 于 2019-09-16 设计创作，主要内容包括：本发明提供一种塑胶改性材料及其制备方法,涉及塑胶材料技术领域。本发明塑胶改性材料由以下原料制成：淀粉、工业石灰、腻子粉、PA6、改性玻璃纤维、改性碳酸钙、润滑剂、增塑剂、抗冲击改性剂。本发明塑胶改性材料,具备很高的硬度,制备的塑胶制件在使用过程中抗刮擦性能强,不易被刮伤；具有很高的光泽度、黑亮程度高、品质稳定,可以直接进行装配,提高了生产效率,降低了生产成本,能够产生很大的经济效益；安全性强,而且力学机械性能优良,具有良好的抗拉伸强度、抗弯曲强度、抗冲击强度、抗热变形温度等性能,塑胶制件使用寿命长。(the invention provides a plastic modified material and a preparation method thereof, and relates to the technical field of plastic materials. The plastic modified material is prepared from the following raw materials: starch, industrial lime, putty powder, PA6, modified glass fiber, modified calcium carbonate, a lubricant, a plasticizer and an impact modifier. The plastic modified material has high hardness, and the prepared plastic part has strong scratch resistance and is not easy to scratch in the using process; the black and white paint has high glossiness, high black and white degree and stable quality, can be directly assembled, improves the production efficiency, reduces the production cost and can generate great economic benefit; the safety is strong, the mechanical property is excellent, the tensile strength, the bending strength, the impact strength, the heat deformation temperature resistance and other properties are good, and the service life of the plastic part is long.)

1. the plastic modified material is characterized by being prepared from the following raw materials in parts by weight: 18-25 parts of starch, 20-30 parts of industrial lime, 20-30 parts of putty powder, 10-16 parts of PA6, 8-15 parts of modified glass fiber, 10-18 parts of modified calcium carbonate, 1-2 parts of lubricant, 1-2 parts of plasticizer and 2-5 parts of impact modifier.

2. The plastic modified material of claim 1, wherein the plastic modified material is prepared from the following raw materials in parts by weight: 20-23 parts of starch, 23-27 parts of industrial lime, 22-27 parts of putty powder, 12-14 parts of PA6, 10-13 parts of modified glass fiber, 12-16 parts of modified calcium carbonate, 1.3-1.7 parts of lubricant, 1.3-1.8 parts of plasticizer and 3-4 parts of impact modifier.

3. The plastic modified material of claim 2, wherein the plastic modified material is prepared from the following raw materials in parts by weight: 21 parts of starch, 25 parts of industrial lime, 25 parts of putty powder, 13 parts of PA6, 12 parts of modified glass fiber, 14 parts of modified calcium carbonate, 1.5 parts of lubricant, 1.5 parts of plasticizer and 3.5 parts of impact modifier.

4. The plastic modified material as claimed in claim 1, 2 or 3, wherein the modified calcium carbonate is modified by the following method: according to a molar ratio of 13: 1, weighing calcium carbonate and sodium hexametaphosphate, placing the calcium carbonate powder in a mortar, adding distilled water until the calcium carbonate powder becomes slurry, grinding for 1-2.5h, adding distilled water into the sodium hexametaphosphate, carrying out ultrasonic treatment for 20-25min to obtain a sodium hexametaphosphate solution, pouring the sodium hexametaphosphate solution into the slurry calcium carbonate for 3 times to obtain a mixed solution, transferring the mixed solution into a beaker, magnetically stirring for 0.5-1h at the temperature of 100 ℃ and 110 ℃ and the rotation speed of 700 ℃ for 800r/min, and then cooling, drying and grinding to obtain the modified calcium carbonate.

5. The plastic modified material of claim 1, 2 or 3, wherein: the modified glass fiber is a glass fiber which is impregnated by an ultrahigh molecular weight polyethylene dispersion liquid, the molecular weight of the ultrahigh molecular weight polyethylene is 500 ten thousand, the elongation at break is 3-10%, the ultrahigh molecular weight polyethylene dispersion liquid is a colloidal solution formed by suspending an ultrahigh molecular weight polyethylene resin with the average particle size of 0.2-0.3 mu m in liquid water, and the viscosity of the colloidal solution is 0.06 Pa.s, and the concentration is 55 wt%.

6. the plastic modified material of claim 1, 2 or 3, wherein: the plasticizer is prepared by mixing dibutyl phthalate, phthalate and dioctyl adipate in a mass ratio of 3:1: 2.

7. the plastic modified material of claim 1, 2 or 3, wherein: the lubricant is at least one of low molecular weight polyethylene wax, stearate, montan wax and pentaerythritol stearate.

8. The plastic modified material of claim 7, wherein: the stearate is one of sodium stearate, magnesium stearate, calcium stearate, lead stearate, aluminum stearate, cadmium stearate, ferric stearate and potassium stearate.

9. The plastic modified material of claim 1, 2 or 3, wherein: the impact modifier is one of a methyl methacrylate-butadiene-styrene terpolymer and a methyl methacrylate-acrylate copolymer.

10. a method for preparing the plastic modified material as claimed in any of claims 1 to 9, comprising the following steps:

s1, weighing the raw materials in parts by weight;

S2, putting starch, industrial lime, putty powder, PA6 and modified glass fiber into a mixer with nitrogen protection, and mixing for 2-10min to obtain a mixed material;

S3, under the protection of nitrogen, putting the mixed material prepared in the step S1 into a parallel double-screw extruder for melting, adding modified calcium carbonate from a side feeding port of the extruder, simultaneously adding a lubricant, a plasticizer and an impact modifier into the side feeding port of the extruder through a liquid pump, and performing extrusion and granulation to obtain the modified calcium carbonate; wherein the temperature of the first zone of the extruder is 180-190 ℃, the temperature of the second zone is 180-190 ℃, the temperature of the third zone is 190-200 ℃, the temperature of the fourth zone is 210-220 ℃, the temperature of the fifth zone is 230-250 ℃ and the temperature of the sixth zone is 245-250 ℃; the rotating speed of the twin-screw main machine is 500 rpm.

Technical Field

the invention relates to the technical field of plastic materials, in particular to a plastic modified material and a preparation method thereof.

background

The plastics are mainly composed of carbon, oxygen, hydrogen, nitrogen and other organic or inorganic elements, and the finished product is a solid and is a molten liquid in the manufacturing process, so that the plastics can be heated to melt, pressurized to flow, cooled to solidify and formed into various shapes. The nylon engineering plastic is widely applied to industries such as electronics, electrics, automobiles, buildings, office equipment, machinery, aerospace and the like due to the high performance advantages of the nylon engineering plastic in the aspects of mechanical property, durability, corrosion resistance, heat resistance and the like, and the international fashion trend of replacing steel with plastic and replacing wood with plastic is achieved.

with the rapid development of economy, the living standard of people is continuously improved, the requirements of people on the appearances of various devices are higher and higher, the requirements on the high glossiness of the device are met, the prepared device shell has a bright appearance, the high requirement on the hardness of the device shell is met, and the scratch-resistant technical effect is achieved in the using process. However, in the process of synthesizing the existing PA alloy material in a polymerization mode, the refractive indexes of various resin materials cannot reach the degree of complete matching, so that the glossiness of the prepared alloy material cannot meet the use requirement, and high-gloss paint needs to be sprayed after the mould is finished, so that the production efficiency is low, and the production cost is increased; in particular, the hardness of the existing PA alloy material can not meet the requirement of scratch resistance, thus greatly limiting the application of the material in various application fields.

therefore, the present invention provides a plastic modified material and a preparation method thereof, which are intended to solve the above problems.

disclosure of Invention

Aiming at the technical problems in the prior art, the invention provides a plastic modified material and a preparation method thereof.

In order to achieve the above purpose, the technical scheme of the invention is realized by the following technical scheme:

the plastic modified material is prepared from the following raw materials in parts by weight: 18-25 parts of starch, 20-30 parts of industrial lime, 20-30 parts of putty powder, 10-16 parts of PA6, 8-15 parts of modified glass fiber, 10-18 parts of modified calcium carbonate, 1-2 parts of lubricant, 1-2 parts of plasticizer and 2-5 parts of impact modifier.

preferably, the plastic modified material is prepared from the following raw materials in parts by weight: 20-23 parts of starch, 23-27 parts of industrial lime, 22-27 parts of putty powder, 12-14 parts of PA6, 10-13 parts of modified glass fiber, 12-16 parts of modified calcium carbonate, 1.3-1.7 parts of lubricant, 1.3-1.8 parts of plasticizer and 3-4 parts of impact modifier.

Preferably, the plastic modified material is prepared from the following raw materials in parts by weight: 21 parts of starch, 25 parts of industrial lime, 25 parts of putty powder, 13 parts of PA6, 12 parts of modified glass fiber, 14 parts of modified calcium carbonate, 1.5 parts of lubricant, 1.5 parts of plasticizer and 3.5 parts of impact modifier.

preferably, the modified calcium carbonate is modified by the following method: according to a molar ratio of 13: 1, weighing calcium carbonate and sodium hexametaphosphate, placing the calcium carbonate powder in a mortar, adding distilled water until the calcium carbonate powder becomes slurry, grinding for 1-2.5h, adding distilled water into the sodium hexametaphosphate, carrying out ultrasonic treatment for 20-25min to obtain a sodium hexametaphosphate solution, pouring the sodium hexametaphosphate solution into the slurry calcium carbonate for 3 times to obtain a mixed solution, transferring the mixed solution into a beaker, magnetically stirring for 0.5-1h at the temperature of 100 ℃ and 110 ℃ and the rotation speed of 700 ℃ for 800r/min, and then cooling, drying and grinding to obtain the modified calcium carbonate.

Preferably, the modified glass fiber is a glass fiber impregnated with an ultra-high molecular weight polyethylene dispersion, the ultra-high molecular weight polyethylene has a molecular weight of 500 ten thousand and an elongation at break of 3 to 10%, and the ultra-high molecular weight polyethylene dispersion is a colloidal solution in which an ultra-high molecular weight polyethylene resin having an average particle size of 0.2 to 0.3 μm is suspended in liquid water, and the colloidal solution has a viscosity of 0.06Pa · s and a concentration of 55 wt%.

preferably, the plasticizer is prepared by mixing dibutyl phthalate, phthalate and dioctyl adipate in a mass ratio of 3:1: 2.

Preferably, the lubricant is at least one of low molecular weight polyethylene wax, stearate, montan wax and pentaerythritol stearate.

preferably, the stearate is one of sodium stearate, magnesium stearate, calcium stearate, lead stearate, aluminum stearate, cadmium stearate, ferric stearate and potassium stearate.

preferably, the impact modifier is one of a methyl methacrylate-butadiene-styrene terpolymer and a methyl methacrylate-acrylate copolymer.

A preparation method of a plastic modified material comprises the following steps:

S1, weighing the raw materials in parts by weight;

s2, putting starch, industrial lime, putty powder, PA6 and modified glass fiber into a mixer with nitrogen protection, and mixing for 2-10min to obtain a mixed material;

S3, under the protection of nitrogen, putting the mixed material prepared in the step S1 into a parallel double-screw extruder for melting, adding modified calcium carbonate from a side feeding port of the extruder, simultaneously adding a lubricant, a plasticizer and an impact modifier into the side feeding port of the extruder through a liquid pump, and performing extrusion and granulation to obtain the modified calcium carbonate; wherein the temperature of the first zone of the extruder is 180-190 ℃, the temperature of the second zone is 180-190 ℃, the temperature of the third zone is 190-200 ℃, the temperature of the fourth zone is 210-220 ℃, the temperature of the fifth zone is 230-250 ℃ and the temperature of the sixth zone is 245-250 ℃; the rotating speed of the twin-screw main machine is 500 rpm.

The invention provides a plastic modified material and a preparation method thereof, and compared with the prior art, the plastic modified material has the advantages that:

the plastic modified material has high hardness, and the prepared plastic part has strong scratch resistance and is not easy to scratch in the using process; the black and white paint has high glossiness, high black and white degree and stable quality, can be directly assembled, improves the production efficiency, reduces the production cost and can generate great economic benefit; the safety is strong, the mechanical property is excellent, the tensile strength, the bending strength, the impact strength, the heat deformation temperature resistance and other properties are good, and the service life of a plastic part is long;

The modified calcium carbonate is applied to the plastic material, the calcium carbonate can be well dispersed in the plastic material, the filling amount of the calcium carbonate in the plastic material is increased, and the hardness and the wear resistance of the plastic material are greatly improved by the application of the modified calcium carbonate;

The modified glass fiber is a glass fiber which is impregnated by the ultra-high molecular weight polyethylene dispersion liquid, the molecular weight of the ultra-high molecular weight polyethylene is 500 ten thousand, the elongation at break is 3-10%, and the adoption of the powder particles avoids the technical problems of poor fiber impregnation efficiency, incomplete impregnation, fiber breakage and the like in the fiber impregnation process;

the preparation method adopts a double-screw extruder with the temperature of 190 ℃ plus 180 ℃ in the first area, the temperature of 190 ℃ plus 180 ℃ in the second area, the temperature of 190 ℃ plus 200 ℃ in the third area, the temperature of 220 ℃ plus 210 ℃ in the fourth area, the temperature of 250 ℃ plus 230 ℃ in the fifth area and the temperature of 250 ℃ plus 245 ℃ in the sixth area; the rotating speed of the double-screw main machine is 500rpm, so that the modified nylon composition can not be blocked at the feeding part in the processing process due to the processing temperature and the rotating speed of the main machine, and the modified nylon composition has the advantages of saturated feeding, uniform plasticization and no material overflow.

Detailed Description

in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.