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CN-121991432-A - High-temperature-resistant environment-friendly water cup material and preparation method thereof

CN121991432ACN 121991432 ACN121991432 ACN 121991432ACN-121991432-A

Abstract

The invention belongs to the technical field of polypropylene materials, and particularly relates to a high-temperature-resistant environment-friendly water cup material and a preparation method thereof. The high-temperature-resistant environment-friendly water cup material comprises, by mass, 100 parts of polypropylene master batch, 8-15 parts of hydrogenated styrene-butadiene block copolymer, 10-20 parts of modified nano calcium carbonate, 3-8 parts of ethylene-vinyl acetate copolymer grafted maleic anhydride, 0.1-0.3 part of beta-crystal nucleating agent, 0.4-1.0 part of antioxidant and 0.5-1.5 parts of lubricant. The material provided by the invention has excellent mechanical properties and excellent thermal deformation temperature and impact embrittlement temperature.

Inventors

  • ZENG XIAOHONG
  • Huang Guanlie
  • XU QINGLIANG
  • ZENG XUEREN

Assignees

  • 广州市宝贝乐婴童用品有限公司

Dates

Publication Date
20260508
Application Date
20260203

Claims (10)

  1. 1. The high-temperature-resistant environment-friendly water cup material is characterized by comprising, by mass, 100 parts of a polypropylene master batch, 8-15 parts of a hydrogenated styrene-butadiene block copolymer, 10-20 parts of modified nano calcium carbonate, 3-8 parts of ethylene-vinyl acetate copolymer grafted maleic anhydride, 0.1-0.3 part of a beta-crystal nucleating agent, 0.4-1.0 part of an antioxidant and 0.5-1.5 parts of a lubricant, wherein the polypropylene master batch comprises (1.2-1.4) 1 (0.6-0.8) of polypropylene I, polypropylene II and polypropylene III, the melt flow rate of the polypropylene I is 56-60g/10min, the melt flow rate of the polypropylene II is 73-77g/10min, and the melt flow rate of the polypropylene III is 32-36g/10min.
  2. 2. The high temperature resistant environmental protection cup material of claim 1, wherein the melt flow rate of polypropylene I is 58g/10min, the melt flow rate of polypropylene II is 75g/10min, and the melt flow rate of polypropylene III is 35g/10min.
  3. 3. The high temperature resistant environmental protection cup material of claim 2, wherein the polypropylene I is a homo-polypropylene of type ExceedTMFlowPP3655E1, the polypropylene II is an impact co-polypropylene of type ExceedTMPP7755KNE1, and the polypropylene III is an impact co-polypropylene of type ExxonMobilTMPP7045E 1.
  4. 4. The high temperature resistant environment-friendly water cup material according to claim 1, wherein the preparation method of the modified nano calcium carbonate comprises the following steps: Mixing water and absolute ethyl alcohol, then aluminate coupling agent to obtain solution, adding nano calcium carbonate into the solution, reacting, centrifuging, drying and crushing after the reaction is finished to obtain coupling agent modified nano calcium carbonate; And step two, heating the coupling agent modified nano calcium carbonate, uniformly dripping liquid stearic acid into the silane nano calcium carbonate, heating for reaction, cooling and crushing after the reaction is finished to obtain the modified nano calcium carbonate.
  5. 5. The high temperature resistant environment-friendly water cup material according to claim 4, wherein the dosage of the aluminate coupling agent is 1.5-2.5% of the total mass of the nano calcium carbonate, and the dosage of the stearic acid is 2.0-3.0% of the total mass of the nano calcium carbonate.
  6. 6. The high-temperature-resistant environment-friendly water cup material according to claim 4, wherein the nano calcium carbonate comprises nano calcium carbonate I, nano calcium carbonate II and nano calcium carbonate III in a mass ratio of 1 (0.3-0.5): (1.4-1.6).
  7. 7. The high temperature resistant environment-friendly water cup material according to claim 6, wherein the particle size of the nano calcium carbonate I is 40-70nm, the average specific surface area is 25-40m <2 >/g, the particle size of the nano calcium carbonate II is 70-100nm, the average specific surface area is 18-25m <2 >/g, the particle size of the nano calcium carbonate III is 10-30nm, and the average specific surface area is 90-100m <2 >/g.
  8. 8. The high temperature resistant environmental protection cup material of claim 1, wherein the antioxidant is antioxidant 1076.
  9. 9. The high temperature resistant environmental friendly water cup material of claim 1 wherein the lubricant is calcium stearate.
  10. 10. A method for preparing the high temperature resistant environment-friendly water cup material according to any one of claims 1 to 9, which is characterized by comprising the following steps: (1) Adding modified nano calcium carbonate, hydrogenated styrene-butadiene block copolymer, ethylene-vinyl acetate copolymer grafted maleic anhydride and lubricant into a high-speed mixer, stirring, continuously adding polypropylene master batch, beta-crystal form nucleating agent and antioxidant, and uniformly stirring to obtain a premix; (2) And (3) carrying out melt blending, extrusion, cooling and granulating on the premixed material by using a homodromous parallel double-screw extruder to obtain the high-temperature-resistant environment-friendly water cup material.

Description

High-temperature-resistant environment-friendly water cup material and preparation method thereof Technical Field The invention belongs to the technical field of polypropylene materials, and particularly relates to a high-temperature-resistant environment-friendly water cup material and a preparation method thereof. Background The cup for children is used as an article closely contacted with the daily diet of children, and has extremely strict requirements on materials for manufacturing the cup for children. The ideal material not only needs to meet basic sanitary requirements such as food safety and the like, but also needs to have excellent comprehensive mechanical properties and temperature resistance so as to cope with various severe scenes in actual use. For example, the cup needs to withstand high temperature cleaning and sterilization, such as boiling water soaking, steam sterilization or dishwasher high temperature washing, while the child cup is used or stored in a low temperature environment, the material must be ensured not to be brittle at low temperature. In addition, the material also needs to have enough tensile strength and bending strength to ensure that the water cup is not easy to crack, deform or break in use, and ensure the durability and the safety of the product. Polypropylene (PP) is one of the common plastics for manufacturing children articles, especially cups, because of its non-toxicity, odorlessness, low density, easy processing and forming, and relatively excellent comprehensive properties. For example, chinese patent CN120607772A discloses a high-temperature-resistant environment-friendly material for a water cup, and the high-temperature-resistant environment-friendly material prepared by the invention can meet the high-temperature requirement and has the advantages of high mechanical strength, safety, environment protection and the like. Chinese patent CN104844938a discloses a high temperature resistant environment-friendly water cup and a preparation method thereof, which has better high temperature resistance, high strength, strong compression performance and toughness, excellent processability and excellent comprehensive performance. In the prior art, in order to raise the heat distortion temperature of PP materials, methods of adding inorganic fillers (such as talcum powder and calcium carbonate) or reinforcing fibers, improving the crystallinity of materials, or blending with high heat resistant polymers are often adopted. Although the method can effectively improve the heat-resistant deformation capacity of the material under load, so that the material is more suitable for high-temperature disinfection environment, obvious negative effects are usually brought, namely, the impact performance, particularly the low-temperature impact performance, is often reduced due to the materials with insufficient stiffening and toughening effects. As a result, the impact embrittlement temperature of the material increases significantly, i.e. the material becomes brittle and fragile at higher low temperatures, thereby bringing a safety hazard. If the low-temperature toughness of PP is improved and the impact embrittlement temperature is reduced, the toughening modification is usually performed by adding an elastomer (such as POE and EPDM) or a specific toughening agent, although the low-temperature impact resistance of the material can be greatly improved, the addition of an elastomer component generally damages the regularity of the PP matrix, and the crystallinity is reduced, so that the rigidity, strength and heat resistance of the whole material are obviously reduced. This makes the cup more prone to softening deformation when holding hot water or sterilizing at high temperature. However, the materials of the prior art cannot simultaneously maintain the excellent properties of high mechanical properties, heat distortion temperature and impact embrittlement temperature. Disclosure of Invention The invention aims to provide a high-temperature-resistant environment-friendly water cup material and a preparation method thereof, which can simultaneously maintain the material to have high mechanical properties and excellent heat distortion temperature and impact embrittlement temperature. In order to achieve the above object, the present invention provides the following technical solutions: The high temperature resistant environment-friendly water cup material comprises, by mass, 100 parts of a polypropylene master batch, 8-15 parts of a hydrogenated styrene-butadiene block copolymer, 10-20 parts of modified nano calcium carbonate, 3-8 parts of ethylene-vinyl acetate copolymer grafted maleic anhydride, 0.1-0.3 part of a beta crystal form nucleating agent, 0.4-1.0 part of an antioxidant and 0.5-1.5 parts of a lubricant. Preferably, the polypropylene master batch comprises polypropylene I, polypropylene II and polypropylene III in a mass ratio of (1.2-1.4) 1 (0.6-0.8). Preferably, the melt