High-strength deformation-resistant injection molding cup and preparation method thereof

Abstract

The invention provides a high-strength deformation-resistant injection molding cup and a preparation method thereof, and the injection molding cup comprises the following raw materials by weight: 30-50 parts of polybutylene terephthalate, 5-10 parts of a compatilizer, 15-25 parts of polylactic acid, 40-60 parts of polycarbonate, 15-25 parts of diphenyl carbonate, 10-15 parts of isosorbide, and 1, 2-propylene glycol. The material is prepared from the following components in parts by weight: 10-15 parts of 1, 4-butanediol, 4-6 parts of a catalyst, 5-10 parts of porous regenerated cellulose, 10-15 parts of poly (butylene succinate) and 4-6 parts of a defoaming agent. The injection molding cup disclosed by the invention has the comprehensive properties of good toughness, strength, fracture resistance, deformation resistance and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molded cups, and particularly relates to a high-strength anti-deformation injection molded cup and a preparation method thereof. Background Art

[0002] An injection molded cup is a cup formed by heating a plastic raw material (such as PP polypropylene) into a fluid and then injecting it into a mold using an injection molding machine and cooling it. This process makes the cup have higher toughness and strength, and the appearance is also more beautiful. Injection molded cups are more durable than ordinary plastic cups, are not easily broken or deformed, and have a longer service life. Injection molded cups are widely used in places such as milk tea shops and coffee shops. In particular, some high-end brands prefer to use injection molded cups to ensure the texture and durability of the cups.

[0003] In the prior art, PET milk tea cups have a smooth and shiny surface and have good abrasion resistance and high / low temperature resistance. However, the overall performance of PET material is worse than that of PP material and is thinner. Although the cost performance of PET material is high and the cost of using it as a milk tea cup is lower, the use of PET to make milk tea cups is becoming less and less. PET cannot meet the application requirements from freezing to hot drinks (80 °C).

[0004] In addition, the PET milk tea cup has a thin material, poor strength and anti-deformation ability, and is easily damaged by extrusion. If the cup accidentally falls, it is also very easy to break, which affects the user experience.

[0005] The current PP injection molded milk tea cups are prepared by using high melt index random copolymer polypropylene (PPR) as the raw material. Although PPR has better impact resistance than ordinary PP, this PPR has good fluidity, and its milk tea cups cannot completely resist cracking, and the anti-deformation ability and structural strength of the milk tea cups have not been significantly improved. Summary of the Invention

[0006] In view of the problems existing in the prior art, the present invention provides a high-strength anti-deformation injection molded cup and a preparation method thereof.

[0007] To achieve the above object, the present invention is realized through the following technical solutions:

[0008] The present application discloses a high-strength anti-deformation injection molded cup. The composition components of the injection molded cup include the following raw materials in parts by weight: 30-50 parts of polybutylene terephthalate, 5-10 parts of compatibilizer, 15-25 parts of polylactic acid, 40-60 parts of polycarbonate, 15-25 parts of diphenyl carbonate, 10-15 parts of isosorbide, 10-15 parts of 1,4-butanediol, 4-6 parts of catalyst, 5-10 parts of porous regenerated cellulose, 10-15 parts of polybutylene succinate, and 4-6 parts of defoamer.

[0009] Preferably, the composition of the injection cup comprises the following raw materials in parts by weight: 40 parts of polybutylene terephthalate, 7 parts of compatibilizer, 20 parts of polylactic acid, 50 parts of polycarbonate, 20 parts of diphenyl carbonate, 12 parts of isosorbide, 12 parts of 1,4-butanediol, 5 parts of catalyst, 7 parts of porous regenerated cellulose, 12 parts of polybutylene succinate, and 5 parts of defoamer.

[0010] Preferably, the catalyst is ferrocene.

[0011] The present application also discloses a preparation method of a high-strength anti-deformation injection cup, which comprises the following steps:

[0012] S1. Add 1 / 2 of the mass of polycarbonate, diphenyl carbonate, isosorbide, 1,4-butanediol and catalyst into a polymerization reactor, and carry out prepolymerization and polycondensation in sequence to obtain an intermediate A for standby;

[0013] S2. Add polybutylene succinate into a chloroform solution and place it on a magnetic stirrer. Wait until it is completely dissolved, add porous regenerated cellulose and stir for a period of time until it is dispersed in the solution. Then stir the mixed solution with a high-speed dispersion homogenizer for 25 min. Transfer the mixed solution to a glass specific surface dish, place it at room temperature for 12 h, volatilize the solvent chloroform, and then put it into a vacuum drying oven and dry it at 40 °C for 6 h to remove chloroform completely and crush it for standby;

[0014] S3. Dry 1 / 2 of the mass of polycarbonate, polybutylene terephthalate, compatibilizer, polylactic acid, intermediate A and the compound obtained in step S2 in a hot air circulation drying oven for 4 h, extrude and granulate with a twin-screw extruder, the extrusion temperature is 280 °C, and add the obtained material particles into an injection mold of an injection cup for injection molding to obtain the product.

[0015] Preferably, in step S1, the conditions of the prepolymerization stage are: the prepolymerization temperature is 125 °C, the prepolymerization pressure is 0.08 - 0.1 MPa, and the reaction time is 50 min.

[0016] Preferably, in step S1, the conditions of the polycondensation stage are: the polycondensation temperature is 210 °C, the pressure is 0.2 kPa, and the reaction time is 35 min.

[0017] Preferably, in step S2, the stirring speed of the high-speed dispersion homogenizer is 8800 - 9000 r / min.

[0018] Preferably, in step S3, control the injection temperature to be 60 - 70 °C, the holding pressure to be 8 - 10 MPa, the holding time to be 30 - 35 min, and the pressure relief speed to be 6 - 8 MPa / s.

[0019] The beneficial effects of the present invention are:

[0020] Polycarbonate has poor processing performance and poor resistance to organic solvents. Polybutylene terephthalate has excellent resistance to organic solvents and chemical corrosion, and is easy to form and process. Polylactic acid is relatively hard and has poor toughness. The compatibility of polycarbonate, polybutylene terephthalate, and polylactic acid is poor. Under the action of titanate or polylactic acid grafted maleic anhydride, the end face is close to a homogeneous system, without obvious dispersed phase and phase interface. Titanate or polylactic acid grafted maleic anhydride can fully improve the three-phase interface situation and play a compatibilizing role in the blend system. Titanate or polylactic acid grafted maleic anhydride has a catalytic effect on the transesterification reaction between polycarbonate and polybutylene terephthalate. During melt blending, the transesterification reaction generates block or random copolyesters, improving the fluidity and chemical resistance of polycarbonate, improving the interface condition, and improving the mechanical properties of the blend material for preparing injection cups. Titanate or polylactic acid grafted maleic anhydride reduces the interfacial tension of the blend system between polycarbonate and polylactic acid, increases the compatibility and interfacial adhesion between the two, improves the stability of the melt blend, and ultimately improves the structural stability, impact resistance, and elongation at break of the injection cup.

[0021] Isosorbide is a rigid molecule with a chiral structure. Isosorbide can improve the glass transition temperature of polymers, has good optical and ultraviolet resistance properties. Under the action of the catalyst ferrocene, 1,4-butanediol, isosorbide, polycarbonate, and diphenyl carbonate are melt polycondensed to synthesize intermediate A (copolycarbonate). 1,4-butanediol increases the flow rate of the copoly melt, promotes the growth of molecular chains, and the flexibility of the molecular chains gradually increases. When used as a raw material to prepare injection cups, its ductility and processing performance are enhanced.

[0022] Porous regenerated cellulose is composed of interconnected networks or closed pore structures, and has advantages such as high porosity and high specific surface area. The functional groups of polybutylene succinate mainly include hydroxyl and carboxyl groups. The introduction of polybutylene succinate makes the three-dimensional fiber network porous structure of porous regenerated cellulose transform into a dense lamellar structure, and gradually improves the porous structure. When used to prepare injection cups, the mechanical strength of the injection cups is fully improved. Specific embodiments

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0024] Example 1:

[0025] This embodiment discloses a high-strength anti-deformation injection cup, which is prepared from the following raw materials in proportion: 30 parts of polybutylene terephthalate, 5 parts of titanate, 15 parts of polylactic acid, 40 parts of polycarbonate, 15 parts of diphenyl carbonate, 10 parts of isosorbide, 10 parts of 1,4-butanediol, 4 parts of ferrocene, 5 parts of porous regenerated cellulose, 10 parts of polybutylene succinate, and 4 parts of defoaming agent.

[0026] This embodiment also discloses a preparation method of a high-strength anti-deformation injection cup, which includes the following steps:

[0027] S1. Add 1 / 2 of the mass of polycarbonate, diphenyl carbonate, isosorbide, 1,4-butanediol and catalyst into a polymerization reactor, and carry out prepolymerization and polycondensation in sequence to obtain intermediate A for standby;

[0028] Among them, the conditions for the prepolymerization stage are: prepolymerization temperature is 125 °C, prepolymerization pressure is 0.08 MPa, and reaction time is 50 min; the conditions for the polycondensation stage are: polycondensation temperature is 210 °C, pressure is 0.2 kPa, and reaction time is 35 min;

[0029] S2. Add polybutylene succinate into a chloroform solution and place it on a magnetic stirrer. After it is completely dissolved, add porous regenerated cellulose and stir for a period of time until it is dispersed in the solution. Then use a high-speed dispersion homogenizer to stir the mixed solution at a speed of 8800 r / min for 25 min. Transfer the mixed solution to a glass specific surface dish, place it at room temperature for 12 h to volatilize the solvent chloroform, and then put it into a vacuum drying oven to dry at 40 °C for 6 h to remove all chloroform and crush it for standby;

[0030] S3. Dry 1 / 2 of the mass of polycarbonate, polybutylene terephthalate, titanate, polylactic acid, intermediate A and the compound obtained in step S2 in a hot air circulation drying oven for 4 h, and extrude and granulate them with a twin-screw extruder. The extrusion temperature is 280 °C. Add the obtained material particles into the injection mold of the injection cup for injection molding to obtain it;

[0031] Among them, the injection temperature is 60 °C, the holding pressure is 8 MPa, the holding time is 30 min, and the pressure relief speed is 6 MPa / s.

[0032] Example 2:

[0033] This embodiment discloses a high-strength anti-deformation injection cup, which is prepared from the following raw materials in proportion: 50 parts of polybutylene terephthalate, 10 parts of polylactic acid grafted maleic anhydride, 25 parts of polylactic acid, 60 parts of polycarbonate, 25 parts of diphenyl carbonate, 15 parts of isosorbide, 15 parts of 1,4-butanediol, 6 parts of ferrocene, 10 parts of porous regenerated cellulose, 15 parts of polybutylene succinate, and 6 parts of defoaming agent.

[0034] This embodiment also discloses a preparation method of a high-strength anti-deformation injection cup, which includes the following steps:

[0035] S1. Add 1 / 2 mass of polycarbonate, diphenyl carbonate, isosorbide, 1,4-butanediol and a catalyst into a polymerization reactor, and carry out prepolymerization and polycondensation in sequence to obtain intermediate A for standby;

[0036] Among them, the conditions for the prepolymerization stage are: prepolymerization temperature is 125 °C, prepolymerization pressure is 0.1 MPa, and reaction time is 50 min; the conditions for the polycondensation stage are: polycondensation temperature is 210 °C, pressure is 0.2 kPa, and reaction time is 35 min;

[0037] S2. Add polybutylene succinate into a chloroform solution and place it on a magnetic stirrer. Wait until it is completely dissolved, add porous regenerated cellulose and stir for a period of time until it is dispersed in the solution. Then use a high-speed dispersing homogenizer to stir the mixed solution at a speed of 9000 r / min for 25 min. Transfer the mixed solution to a glass specific surface dish, place it at room temperature for 12 h to volatilize the solvent chloroform, and then put it into a vacuum drying oven to dry at 40 °C for 6 h to remove chloroform completely and crush it for standby;

[0038] S3. Dry 1 / 2 mass of polycarbonate, polybutylene terephthalate, polylactic acid grafted maleic anhydride, polylactic acid, intermediate A and the compound obtained in step S2 in a hot air circulation drying oven for 4 h, and extrude and pelletize them with a twin-screw extruder. The extrusion temperature is 280 °C. Add the obtained material particles into an injection mold of an injection cup for injection molding to obtain the product;

[0039] Among them, the injection temperature is 70 °C, the holding pressure is 10 MPa, the holding time is 35 min, and the pressure relief speed is 8 MPa / s.

[0040] Example 3:

[0041] This embodiment discloses a high-strength anti-deformation injection cup, which is prepared from the following raw materials in proportion: 40 parts of polybutylene terephthalate, 7 parts of polylactic acid grafted maleic anhydride, 20 parts of polylactic acid, 50 parts of polycarbonate, 20 parts of diphenyl carbonate, 12 parts of isosorbide, 12 parts of 1,4-butanediol, 5 parts of ferrocene, 7 parts of porous regenerated cellulose, 12 parts of polybutylene succinate, and 5 parts of defoaming agent.

[0042] This embodiment also discloses a preparation method of a high-strength anti-deformation injection cup, which includes the following steps:

[0043] S1. Add 1 / 2 mass of polycarbonate, diphenyl carbonate, isosorbide, 1,4-butanediol and a catalyst into a polymerization reactor, and conduct prepolymerization and polycondensation in sequence to obtain intermediate A for standby;

[0044] Among them, the conditions for the prepolymerization stage are: prepolymerization temperature is 125 °C, prepolymerization pressure is 0.09 MPa, and reaction time is 50 min; the conditions for the polycondensation stage are: polycondensation temperature is 210 °C, pressure is 0.2 kPa, and reaction time is 35 min;

[0045] S2. Add polybutylene succinate into a chloroform solution and place it on a magnetic stirrer. After it is completely dissolved, add porous regenerated cellulose and stir for a period of time until it is dispersed in the solution. Then, use a high-speed dispersion homogenizer to stir the mixed solution at a speed of 8900 r / min for 25 min. Transfer the mixed solution to a glass petri dish, place it at room temperature for 12 h to volatilize the solvent chloroform, and then put it into a vacuum drying oven to dry at 40 °C for 6 h. After removing all chloroform, crush it for standby;

[0046] S3. Dry 1 / 2 mass of polycarbonate, polybutylene terephthalate, maleic anhydride-grafted polylactic acid, polylactic acid, intermediate A and the compound obtained in step S2 in a hot air circulation drying oven for 4 h, and extrude and pelletize them using a twin-screw extruder. The extrusion temperature is 280 °C. Add the obtained material particles into an injection mold of an injection cup for injection molding to obtain the product;

[0047] Among them, the injection temperature is 65 °C, the holding pressure is 9 MPa, the holding time is 32 min, and the pressure relief speed is 7 MPa / s.

[0048] Comparative Example 1:

[0049] A high-strength anti-deformation injection cup, and the difference between this high-strength anti-deformation injection cup and Example 3 is only that: polybutylene terephthalate is not added.

[0050] Comparative Example 2:

[0051] A high-strength anti-deformation injection cup, and the difference between this high-strength anti-deformation injection cup and Example 3 is only that: maleic anhydride-grafted polylactic acid is not added.

[0052] Comparative Example 3:

[0053] A high-strength anti-deformation injection cup, and the difference between this high-strength anti-deformation injection cup and Example 3 is only that: polylactic acid is not added.

[0054] Comparative Example 4:

[0055] A high-strength anti-deformation injection cup, and the difference between this high-strength anti-deformation injection cup and Example 3 is only that: polycarbonate is not added.

[0056] Comparative Example 5:

[0057] A high-strength anti-deformation injection cup, the difference between this high-strength anti-deformation injection cup and Example 3 is only that: diphenyl carbonate is not added.

[0058] Comparative Example 6:

[0059] A high-strength anti-deformation injection cup, the difference between this high-strength anti-deformation injection cup and Example 3 is only that: isosorbide is not added.

[0060] Comparative Example 7:

[0061] A high-strength anti-deformation injection cup, the difference between this high-strength anti-deformation injection cup and Example 3 is only that: 1,4-butanediol is not added.

[0062] Comparative Example 8:

[0063] A high-strength anti-deformation injection cup, the difference between this high-strength anti-deformation injection cup and Example 3 is only that: ferrocene is not added.

[0064] Comparative Example 9:

[0065] A high-strength anti-deformation injection cup, the difference between this high-strength anti-deformation injection cup and Example 3 is only that: porous regenerated cellulose is not added.

[0066] Comparative Example 10:

[0067] A high-strength anti-deformation injection cup, the difference between this high-strength anti-deformation injection cup and Example 3 is only that: polybutylene succinate is not added.

[0068] Comparative Example 11:

[0069] A high-strength anti-deformation injection cup, the difference between this high-strength anti-deformation injection cup and Example 3 is only that: defoamer is not added.

[0070] Perform performance tests on the injection cups obtained from the above Examples 1-3 and Comparative Examples 1-11, and measure the comprehensive performance in the injection cups. The results are shown in Table 1.

[0071] Table 1 Performance parameters of the injection cups obtained from Examples 1-3 and Comparative Examples 1-11

[0072]

[0073] In summary, titanate or maleic anhydride-grafted polylactic acid has a catalytic effect on the transesterification reaction between polycarbonate and polybutylene terephthalate. During melt blending, the transesterification reaction generates block or random copolyesters, improving the fluidity and chemical resistance of polycarbonate, improving the interfacial condition, and enhancing the mechanical properties of the blend material for preparing injection cups. Titanate or maleic anhydride-grafted polylactic acid reduces the interfacial tension of the blend system between polycarbonate and polylactic acid, increases the compatibility and interfacial adhesion between the two, improves the stability of the melt blend, and ultimately enhances the structural stability, impact resistance, and elongation at break of the injection cup.

[0074] Isosorbide is a rigid molecule with a chiral structure. Isosorbide can improve the glass transition temperature of polymers, has good optical and ultraviolet resistance properties. Under the action of the catalyst ferrocene, 1,4-butanediol, isosorbide, polycarbonate, and diphenyl carbonate are melt polycondensed to synthesize intermediate A (copolycarbonate). 1,4-butanediol increases the flow rate of the copoly melt, promotes the growth of molecular chains, and the flexibility of the molecular chains gradually increases. When used as raw materials to prepare injection cups, its ductility and processing performance are enhanced.

[0075] Porous regenerated cellulose is composed of interconnected networks or closed pore structures, and has advantages such as high porosity and high specific surface area. The functional groups of polybutylene succinate mainly include hydroxyl and carboxyl groups. The introduction of polybutylene succinate causes the three-dimensional fiber network porous structure of porous regenerated cellulose to transform into a dense lamellar structure and gradually perfects the porous structure. When used to prepare injection cups, the mechanical strength of the injection cups is fully improved.

[0076] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-strength anti-deformation injection molded cup, characterized in that: The components of the injection molding cup include the following raw materials in parts by weight: 30-50 parts of polybutylene terephthalate, 5-10 parts of a compatibilizer, 15-25 parts of polylactic acid, 40-60 parts of polycarbonate, 15-25 parts of diphenyl carbonate, 10-15 parts of isosorbide, 10-15 parts of 1,4-butanediol, 4-6 parts of a catalyst, 5-10 parts of porous regenerated cellulose, 10-15 parts of polybutylene succinate, and 4-6 parts of a defoaming agent.

2. The high-strength anti-deformation injection molded cup according to claim 1, characterized in that: The components of the injection molded cup include the following raw materials in parts by weight: 40 parts of polybutylene terephthalate, 7 parts of a compatibilizer, 20 parts of polylactic acid, 50 parts of polycarbonate, 20 parts of diphenyl carbonate, 12 parts of isosorbide, 12 parts of 1,4-butanediol, 5 parts of a catalyst, 7 parts of porous regenerated cellulose, 12 parts of polybutylene succinate, and 5 parts of a defoaming agent.

3. The high-strength anti-deformation injection molded cup according to claim 2, characterized in that: The catalyst is ferrocene.

4. A method for preparing a high-strength anti-deformation injection molded cup according to any one of claims 1 or 2, characterized in that: The preparation method comprises the following steps: S1, adding 1 / 2 mass of polycarbonate, diphenyl carbonate, isosorbide, 1,4-butanediol and catalyst into a polymerization reactor, and sequentially performing prepolymerization and polycondensation to obtain intermediate A for standby use; S2, adding polybutylene succinate to chloroform solution and placing it on a magnetic stirrer, wait for it to be completely dissolved, add porous regenerated cellulose and stir again for a period of time until it is dispersed in the solution, then stir the mixed solution with a high-speed dispersing homogenizer for 25 minutes, transfer the mixed solution to a glass surface plate, place it at room temperature for 12 hours, evaporate the solvent chloroform, and then place it in a vacuum drying oven at 40°C for 6 hours, remove the chloroform and crush it for standby use; S3. Dry 1 / 2 the mass of polycarbonate, polybutylene terephthalate, compatibilizer, polylactic acid, intermediate A and the compound obtained in step S2 in a hot air circulation drying oven for 4 hours, and extrude and granulate them using a double-rod screw extruder at an extrusion temperature of 280° C. Add the obtained material particles into an injection mold of an injection molding cup for injection molding to obtain the product.

5. The method for preparing a high-strength anti-deformation injection molded cup according to claim 4, characterized in that: In step S1, the conditions of the prepolymerization stage are: prepolymerization temperature is 125° C., prepolymerization pressure is 0.08-0.1 MPa, and reaction time is 50 min.

6. The method for preparing a high-strength anti-deformation injection molded cup according to claim 4, characterized in that: In step S1, the conditions of the polycondensation stage are: polycondensation temperature is 210°C, pressure is 0.2 kPa, and reaction time is 35 min.

7. The method for preparing a high-strength anti-deformation injection molded cup according to claim 4, characterized in that: In step S2, the stirring speed of the high-speed dispersing homogenizer is 8800-9000 r / min.

8. The method for preparing a high-strength anti-deformation injection molded cup according to claim 4, characterized in that: In step S3, the injection temperature is controlled to be 60-70° C., the holding pressure is 8-10 MPa, the holding time is 30-35 min, and the pressure release rate is 6-8 MPa / s.

9. The method for preparing a high-strength anti-deformation injection molded cup according to claim 2, characterized in that: The compatibilizer is titanate or polylactic acid grafted with maleic anhydride.

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