CN119081363A

CN119081363A - PET material for plastic goblet and its processing and molding technology

Info

Publication number: CN119081363A
Application number: CN202411202047.6A
Authority: CN
Inventors: 秦勇; 黄先文
Original assignee: Huizhou Aerobic Forest Environmental Protection Technology Co ltd
Current assignee: Huizhou Aerobic Forest Environmental Protection Technology Co ltd
Priority date: 2024-08-29
Filing date: 2024-08-29
Publication date: 2024-12-06
Anticipated expiration: 2044-08-29
Also published as: CN119081363B

Abstract

The invention discloses a PET material for a plastic goblet and a processing and molding process thereof, which belong to the field of high polymer materials, wherein the PET material for the plastic goblet comprises, by weight, 95-98 parts of PET, 0.5-3 parts of a nucleating agent and 1-2 parts of a heat stabilizer, the processing and molding process for the plastic goblet comprises the following steps of S1, preparing a sheet, S2, preparing a cup bowl, S3, preparing a cup foot and a base, S4, combining the goblet, and adopting a blow molding die with an included angle to blow-mold a cup blank, thereby omitting the step of curling, simplifying the process flow, and modifying the surface of organic nano silicon dioxide through atom transfer radical polymerization to obtain an organic nano silicon dioxide nucleating agent for grafting ionomer, and the organic nano silicon dioxide nucleating agent has good compatibility and dispersibility for the PET material, excellent nucleating efficiency and a certain improvement on the physical properties of the material.

Description

PET material for plastic goblets and processing and molding process thereof

The invention relates to the field of high polymer materials, in particular to a PET material for a plastic goblet and a processing and molding process thereof.

Background

The goblet is a cup with a higher base and a larger cup body, and is commonly used for drinking red wine, champagne and other beverages. The goblets can be classified as glass, crystal, plastic, etc., depending on the material. PET (polyethylene terephthalate) is a common material for manufacturing plastic goblets, has light weight and is not fragile, and is suitable for daily and outdoor use.

Blow molding is the most important link of PET goblet cup bowl shaping, and the blowing often needs to improve the crystallinity of material through stretching, and when stretching is insufficient, the crystallinity of product is insufficient, can lead to the product fracture when the stretching ratio is too big. In order to improve the properties of PET materials during stretch blow molding and the quality of the final product, it is generally necessary to add a certain amount of nucleating agent. The existing nucleating agent can be divided into inorganic small molecules, organic small molecules and organic polymers according to chemical components. At present, inorganic powders including silica have an effect of promoting crystallization of polyester materials, but silica is poor in dispersibility and is easily aggregated. The nucleation rate of the organic micromolecules and the organic ionomer is low, and the thermal stability is poor. The most common method at present is that nano silicon dioxide coated by polymer can be uniformly dispersed in PET, but the outer layer is neutral polymer, and the nucleation efficiency is low.

The edge of the rim of the PET goblet is not specially treated, the goblet is not curled in the original cutting state, and the edge of the rim of the cup is curled to form a curled goblet with smooth edge. The goblet is not curled, the manufacturing is simple, the cost is lower, but sharp edges possibly exist, and the use experience is relatively poor. The curled goblet is comfortable to drink, reduces the risk of cutting injury, but has relatively complex manufacturing process and slightly high cost. The prior curling process mainly comprises the following steps of a) heating and softening the rim of the cup opening by using a heating device, then rolling the rim by using a die, b) mechanically curling the rim of the cup opening by using a special curling machine and using mechanical force, c) flame curling, namely rapidly heating the rim of the cup opening by using high-temperature flame, then carrying out curling treatment, and d) ultrasonic curling, namely locally melting the rim of the cup opening by using ultrasonic energy, and then carrying out curling. The method has the advantages of high energy consumption, need of additional heating equipment, easiness in causing micro cracks to influence the service life of the product, difficulty in accurately controlling the heating degree, easiness in causing overburning or insufficient heating, high equipment cost and high technical requirements on operators.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention modifies the surface of the organic nano silicon dioxide through Atom Transfer Radical (ATRP) polymerization to obtain the organic nano silicon dioxide nucleating agent of the grafted ionomer, which has good compatibility, dispersibility and nucleation efficiency on PET materials and improves the material performance to a certain extent, and adopts a blow molding die with an included angle to blow-mold the cup blank, thereby omitting the hemming step and simplifying the process flow.

The technical scheme includes that the PET material for the plastic goblet comprises, by weight, 95-98 parts of PET, 0.5-3 parts of a nucleating agent and 1-2 parts of a heat stabilizer, wherein the preparation method of the nucleating agent comprises the following steps:

1) Adding 1 part of siloxane into a reaction kettle, dissolving the siloxane into a mixed solution of 30-40 parts of N, N-dimethylformamide and 15-20 parts of methanol, sequentially adding 0.7-0.8 part of ammonium hydroxide and 1.0-1.1 part of distilled water, sealing, heating and stirring for reaction for 24 hours at 50-60 ℃ to obtain colorless transparent liquid, and removing the solvent to obtain the organic nano silicon dioxide with hydroxyl and amino on the surface;

2) Dispersing 1 part of the organic nano silicon dioxide obtained in the step 1) in 20-25 parts of anhydrous dichloromethane solvent, carrying out ultrasonic treatment for 15-30 min, transferring to a reaction kettle, adding 2.5-3 parts of triethylamine, bubbling the solution for 3-5 min by using argon, dissolving 1.5-2.0 parts of acylating agent in the anhydrous dichloromethane solvent at 0-5 ℃, slowly dropwise adding the solution into the reaction kettle, reacting at room temperature for 20-24 h, washing three times respectively by using dilute hydrochloric acid solution, distilled water and saturated sodium bicarbonate aqueous solution after the reaction is finished, drying by using anhydrous magnesium sulfate, collecting an organic phase, and removing the solvent to obtain the organic nano silicon dioxide initiator;

3) Preparing a nucleating agent, namely dispersing 1 part of the organic nano silicon dioxide initiator obtained in the step 2) in 30-35 parts of anhydrous anisole solvent, carrying out ultrasonic treatment for 15-30 min, transferring to a reaction kettle, respectively adding 20-25 parts of acrylic ester monomer and 0.01-0.015 part of cuprous bromide, carrying out freeze thawing and degassing for three times, adding 0.15-0.22 part of N, N, N-methyl diethylenetriamine ligand under nitrogen atmosphere, stirring for 6-8 h under heating condition of 60-65 ℃, then adding 5-10 parts of maleic anhydride monomer under nitrogen atmosphere, stirring for 6-8 h, terminating polymerization reaction, washing to remove oxidized copper ions through distilled water, collecting an organic phase, carrying out rotary evaporation and concentration, dispersing in a mixed solution of aqueous solution and methanol, stirring for 1-2 h under 25-40 ℃, carrying out rotary evaporation to remove methanol, extracting the solvent for three times, collecting the organic phase, carrying out rotary evaporation and drying, and obtaining the nucleating agent through sodium hydroxide.

Preferably, the PET is food grade PET.

Preferably, the heat stabilizer is at least one of calcium-zinc stabilizer and epoxidized soybean oil.

Preferably, the siloxane in step 1) is at least one of 3-aminopropyl triethoxysilane, 3-aminopropyl trimethoxysilane.

Preferably, in the step 2), the acylating agent is one or more of chloroacetyl chloride, bromoacetyl chloride and bromoacetyl bromide;

more preferably, the acylating agent in step 2) is chloroacetyl chloride.

Preferably, the acrylate monomer in the step 3) is one or more of ethyl acrylate and methyl acrylate.

More preferably, the acrylate monomer in step 3) is ethyl acrylate.

Preferably, the concentration of the sodium hydroxide aqueous solution in the step 3) is 1-2 mol/L, and the volume ratio of the sodium hydroxide aqueous solution to the methanol in the mixed solution is (1:2) - (2:1).

The invention also discloses a plastic goblet processing and forming process, which comprises the following steps:

S1, preparing a sheet, namely uniformly mixing PET, a nucleating agent and a heat stabilizer, and then feeding the mixture into an extruder to extrude the mixture into a PET sheet;

S2, preparing a cup bowl, namely molding the PET sheet obtained in the step S1 into a cup blank through a molding die, cooling, placing the cup blank into a blow molding die with an included angle for preheating, and stretching, pre-blowing, high-blowing, cooling and die opening to obtain the cup bowl with curled edges;

s3, preparing a cup leg and a base, namely uniformly mixing PET, a nucleating agent and a heat stabilizer, injecting the mixture into a mold of the cup leg and the base through an injection molding machine, and cooling, solidifying and opening the mold to obtain the cup leg and the base;

s4, combining the goblet, namely pressurizing and combining the bowl with the goblet through a hot melting mode, and punching and shearing to obtain the goblet.

Preferably, the blow mold comprises a body having a cavity into which the cup blank is introduced, a fixed portion comprising an upper die 20 and a lower die 30, wherein the upper die 20 and the lower die 30 are clamped against each other and define an included angle 31, and a blow-molding portion comprising a stretching mandrel 10 and a blow pipe 11, the blow-molding portion being disposed in the upper die 20 and being inserted into the cavity.

In particular, the mold cavity is not limited to the shape shown in the drawings, and in one particular embodiment, the mold cavity may be in the shape of a Bondue cup mold cavity, a Bondup cup mold cavity, a tulip champagne cup mold cavity, a shallow dish champagne cup mold cavity, a white wine cup mold cavity, a sweet wine cup mold cavity, a Chardonner cup mold cavity, a Leuchy cup mold cavity, a Bott cup mold cavity, and the like.

An included angle is arranged between the upper die and the lower die, and the cup bowl with the curled edge is directly obtained during blow molding.

Specifically, the extrusion temperature in the step S1 is 240-280 ℃, the screw rotating speed is 50-80 rpm, the molding temperature in the step S2 is 250-280 ℃, the preheating temperature is 90-110 ℃, the stretching temperature is 90-100 ℃, the stretching length is 80-90 mm, the blowing temperature is 100-120 ℃, the pre-blowing pressure is 1-1.3 mpa, the high blowing pressure is 3.5-4.5 mpa, the injection temperature in the step S3 is 260-280 ℃, the injection pressure is 80-120 mpa, the compression bonding temperature in the step S4 is 200-230 ℃, and the compression pressure is 0.3-0.5 mpa.

Advantageous effects

The invention has the following beneficial effects:

(1) The cup blank is subjected to blow molding by adopting the blow molding die with the included angle, so that the hemming step is omitted, the process flow is simplified, and the production efficiency is improved.

(2) The modified organic nano silicon dioxide nucleating agent is formed by synergistic nucleation of organic nano silicon dioxide and an ionomer, besides the nucleation effect, the ionomer also plays a role in improving the dispersibility and compatibility of the nucleating agent, and the organic nano silicon dioxide plays a role in enhancing the stability of the nucleating agent and improving the mechanical properties of PET.

(3) The self-made organic nano silicon dioxide has more reaction sites than the commercial nano silicon dioxide, has a large number of amino groups besides unreacted hydroxyl groups on the surface, is subjected to ATRP polymerization and hydrolysis after being modified by an acylating agent, has more reaction sites than the common nano silicon dioxide, can be grafted with more polymer chains, has better dispersibility and is not easy to aggregate, and the toughness of the core can be further improved by introducing alkyl chains into the self-made organic nano silicon dioxide.

(4) The nucleating agent is added, so that the crystallization speed of PET can be improved, the production efficiency is improved, the transparency and the glossiness are improved, and the mechanical properties such as stretching of PET are improved.

Drawings

FIG. 1 is a schematic diagram of the structure and synthesis of a nucleating agent of the present invention;

FIG. 2 is an infrared spectrum of the synthesized product of the present invention;

FIG. 3 is a graph showing the hydrodynamic diameters of the organo nanosilica and nucleating agent of the present invention;

FIG. 4 shows melting crystallization curves of different materials according to the present invention.

FIG. 5 is a schematic view of a blow mold structure according to the present invention;

in the drawing, 10, a stretching core rod, 11, a blowpipe, 20, an upper die, 30, a lower die and 31, wherein the included angle is formed;

Detailed Description

The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the examples, the experimental methods used are conventional methods unless otherwise specified, and the materials, reagents, etc. used, unless otherwise specified, are commercially available.

The following description will be made of the raw materials and equipment used in the examples and comparative examples:

PET, food grade PET resin, brand FG-530, duPont;

The heat stabilizer is calcium-zinc stabilizer with the brand of CF128, hubei Chengfeng chemical Co., ltd;

3-aminopropyl triethoxysilane, product number A800523, available from Shanghai Michelin Biochemical technology;

chloroacetyl chloride, product number C804574, purchased from Shanghai microphone Biochemical technology;

cuprous bromide, product number C804582, purchased from Shanghai Michelin Biochemical technology;

N, N, N' -pentamethyldiethylenetriamine, product number N822749, available from Shanghai Michelia Biochemical technology;

maleic anhydride, product number M821319, purchased from Shanghai Michelin Biochemical technology;

ethyl acrylate, product number E809084, purchased from Shanghai microphone Biochemical technology;

commercially available nano silicon dioxide 1 with the particle size of 7nm is purchased from Zhejiang Mangan particle nanotechnology Co., ltd;

The commercial nano silicon dioxide 2 with the particle size of 20nm is purchased from Zhejiang Mangan particle nanotechnology Co.

PEA-MA (Poly (ethyl acrylate) -maleic acid copolymer)

Adding 20 parts of ethyl acrylate and 0.01 part of cuprous bromide respectively into a reaction kettle, freezing, thawing and degassing for three times, adding 0.15 part of N, N, N, N-type-penta-methyldiethylenetriamine ligand under the nitrogen atmosphere, stirring for 6 hours under the heating condition of 60 ℃, adding 5 parts of maleic anhydride monomer under the nitrogen atmosphere, stirring for 6 hours, introducing oxygen, stopping polymerization reaction, washing by distilled water to remove oxidized copper ions, collecting an organic phase, concentrating by rotary evaporation, dispersing in a mixed solution of sodium hydroxide aqueous solution and methanol, stirring for 2 hours under the temperature of 25 ℃, removing methanol by rotary evaporation, extracting by a methylene dichloride solvent for three times, collecting the organic phase, concentrating by rotary evaporation, precipitating in cold methanol, filtering and drying to obtain PEA-MA.

Organic nano silicon dioxide

Adding 1 part of siloxane into a reaction kettle, dissolving the siloxane into a mixed solution of 30 parts of N, N-dimethylformamide and 20 parts of methanol, sequentially adding 0.8 part of ammonium hydroxide and 1.05 part of distilled water, sealing, heating and stirring for reaction for 24 hours at 50 ℃ to obtain colorless transparent liquid, and removing the solvent to obtain the organic nano silicon dioxide with hydroxyl and amino on the surface.

Organic nano silicon dioxide initiator 1

Dispersing 1 part of obtained organic nano silicon dioxide in 25 parts of anhydrous dichloromethane solvent, carrying out ultrasonic treatment for 15-30 min, transferring to a reaction kettle, adding 3 parts of triethylamine, bubbling the solution for 5min by using argon, slowly dripping 2.0 parts of chloroacetyl chloride into the anhydrous dichloromethane solvent at 0 ℃, reacting for 24h at room temperature, washing three times by using dilute hydrochloric acid solution, distilled water and saturated sodium bicarbonate aqueous solution respectively after the reaction is finished, drying anhydrous magnesium sulfate, collecting an organic phase, and removing the solvent to obtain the organic nano silicon dioxide initiator.

Organic nano silicon dioxide initiator 2

The difference compared to the organic nanosilica initiator 1 is that the organic nanosilica is replaced by commercially available nanosilica 1.

Nucleating agent 1

Dispersing 1 part of the obtained organic nano silicon dioxide initiator 1 in 30 parts of anhydrous anisole solvent, transferring to a reaction kettle after ultrasonic treatment for 15min, respectively adding 20 parts of ethyl acrylate and 0.01 part of cuprous bromide, freezing and thawing for three times, adding 0.15 part of N, N, N-methyl diethylenetriamine ligand under nitrogen atmosphere, stirring for 6h under 60 ℃ heating condition, adding 5 parts of maleic anhydride monomer under nitrogen atmosphere, stirring for 6h, introducing oxygen, terminating polymerization reaction, removing oxidized copper ions through washing with distilled water, collecting an organic phase, concentrating by rotary evaporation, dispersing in a mixed solution of sodium hydroxide aqueous solution and methanol, stirring for 2h under 25 ℃, removing methanol by rotary evaporation, extracting with methylene dichloride solvent three times, collecting the organic phase, concentrating by rotary evaporation, precipitating in cold methanol, filtering and drying to obtain the nucleating agent 1.

Nucleating agent 2

Dispersing 1 part of the obtained organic nano silicon dioxide initiator 1 in 35 parts of anhydrous anisole solvent, transferring to a reaction kettle after ultrasonic treatment for 30min, respectively adding 25 parts of ethyl acrylate and 0.015 part of cuprous bromide, freezing and thawing for three times, adding 0.22 part of N, N, N-methyl diethylenetriamine ligand under the nitrogen atmosphere, stirring for 8h under the heating condition of 65 ℃, adding 10 parts of maleic anhydride monomer under the nitrogen atmosphere, stirring for 8h, introducing oxygen, terminating polymerization reaction, removing oxidized copper ions through washing with distilled water, collecting an organic phase, concentrating by rotary evaporation, dispersing in a mixed solution of sodium hydroxide aqueous solution and methanol, stirring for 1h under the temperature of 40 ℃, removing methanol by rotary evaporation, extracting the methylene dichloride solvent three times, collecting the organic phase, concentrating by rotary evaporation, precipitating in cold methanol, filtering and drying to obtain the nucleating agent 2.

Nucleating agent 3

The difference compared to the nucleating agent 2 is that the organic nanosilica initiator 1 is replaced with an organic nanosilica initiator 2.

The following is a test method related to performance parameters in the present invention:

(1) Melt strength, namely adding the PET sheet into a melt tension rheometer for testing according to parameters of extrusion temperature of 280 ℃, speed of 0.5g/min and stretching speed of 15 m/min;

(2) Crystallization behavior, differential scanning calorimetry, cooling rate of 10 ℃ per minute;

(3) Stretching strength, namely blowing a PET sheet to form a film and cutting the film into a sample, and determining according to GB/T1040.3-2006 test conditions of film and sheet in the 3 rd part of determination of Plastic stretching Property;

(4) The fracture nominal strain is measured according to GB/T1040.3-2006 test conditions for measuring the tensile Properties of plastics part 3, films and sheets by blow moulding a PET sheet to form a film and cutting a sample.

(5) And (3) light transmittance testing, namely blow molding a PET sheet to form a film and cutting a sample, and measuring according to GB/T2410-2008 'determination of light transmittance and haze of transparent plastics'.

(6) Gloss testing, namely blow molding a PET sheet to form a film and cutting the film into a sample, and determining according to GB/T8807-1988 specular gloss test method for plastics.

As can be seen from the infrared spectrum of FIG. 2, the peak of 1045cm ^-1 is Si-O-Si, the peak of 3300cm ^-1 is Si-OH, the hydroxyl group reacts with the amino group in the organic nano silicon dioxide initiator, the peak of 1526cm ^-1 and 1715cm ^-1 are amide and ester groups, and the peak of 3390cm ^-1 is carboxyl after polymerization and hydrolysis.

From the hydrodynamic diameter data measured by dynamic light scattering in FIG. 3, the particle size changed from 6nm to 17nm after grafting, further demonstrating the successful grafting of the polymer onto the organic nanosilica.

The molding process for processing the plastic goblet comprises the following steps of:

S1, preparing a sheet, namely uniformly mixing PET, a nucleating agent and a heat stabilizer, then feeding the mixture into an extruder, and extruding the mixture into the PET sheet at the extrusion temperature of 240-280 ℃ and the screw rotation speed of 50-80 rpm;

S2, preparing a cup bowl, namely, molding the PET sheet obtained in the S1 into a cup blank through a molding die at the molding temperature of 250-280 ℃, cooling, placing the cup blank into a blow molding die with an included angle for preheating at the temperature of 90-110 ℃, stretching at the temperature of 90-100 ℃ and the length of 80-90 mm, pre-blowing at the pressure of 1-1.3 mpa, high-blowing at the pressure of 3.5-4.5 mpa, cooling, and opening the die to obtain the cup bowl with curled edges;

S3, preparing a cup foot and a base, namely injecting PET, a nucleating agent and a heat stabilizer into a mold of the cup foot and the base through an injection molding machine with the temperature of 260-280 ℃ and the pressure of 80-120 mpa, and cooling, solidifying and opening the mold to obtain the cup foot and the base;

s4, combining the goblet, namely pressurizing and combining the bowl and the goblet by means of hot melting at the temperature of 200-230 ℃ and the pressure of 0.3-0.5 mpa, and punching and shearing to obtain the goblet.

Table 1 Plastic goblet formulation, example 1 to 7 (mass/kg)

	Example 1	Example 2	Example 3	Example 4	Example 5	Example 6	Example 7
								PET	98	95	97.5	97	96.5	96	97
Nucleating agent 1	0.5	3	1	1.5	2	2.5
								Nucleating agent 2							1.5
Heat stabilizer	1	2	1	1	1	1	1

Table 2 Plastic goblet recipe, comparative examples 1 to 5 (mass/kg)

	Comparative example 1	Comparative example 2	Comparative example 3	Comparative example 4	Comparative example 5
						PET	97	97	97	98.5	92
Commercial nanosilica 2	1.5				5.5
						PEA-MA		1.5
Nucleating agent 3			1.5
						Heat stabilizer	1	1	1	1	1

TABLE 3 physical Property test

As can be seen from the data of examples and comparative examples, the nucleating agent prepared by the invention can effectively enhance the melt strength of PET materials, increase the crystallization temperature of cooling after melting, enhance the crystallization performance, improve the tensile property and the fracture nominal strain, and have good light transmittance and glossiness, so that the prepared plastic goblet has glass texture and meets the strength requirement.

As can be seen from examples 1, 3, 4,5 and 6 in table 3, the melt strength, tensile strength and fracture nominal strain are increased and then decreased with increasing content of the nucleating agent, but the melt crystallization temperature is increased gradually, the light transmittance and glossiness are increased, which means that the crystallization capability is always improved, but too high crystallinity also decreases the performance of the material, as can be seen from examples 4 and 7, when the content of MA in the nucleating agent is too high, the melt strength, tensile strength and fracture nominal strain of the material are decreased, but the crystallization capability is improved, the light transmittance is better, the crystallization capability of MA can be effectively enhanced, but too much existence also causes fracture of PET chains, the glossiness is decreased, which is supposed to decrease the performance of the material, as can be seen from comparative examples 1, 2 and 4, the effect is not as good as that of PEA-MA alone and nano-silica to the performance of the material is improved, as can be seen from comparative example 3, the effect of improving the commercial nucleating agent 3 by modifying the commercial silica is not as good as that of PEA-MA and 2 has poor flexibility and poor surface flexibility as compared with commercial effect of PEA-2.

The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.

Claims

1. The PET material for the plastic goblet is characterized by comprising, by weight, 95-98 parts of PET, 0.5-3 parts of a nucleating agent and 1-2 parts of a heat stabilizer, wherein the preparation method of the nucleating agent comprises the following steps:

2. A PET material for a plastic goblet as claimed in claim 1 wherein said PET is food grade PET.

3. The PET material for plastic goblets of claim 1, wherein the heat stabilizer is at least one of a calcium zinc stabilizer and epoxidized soybean oil.

4. The PET material for the plastic goblets as defined in claim 1, wherein the siloxane in step 1) is at least one of 3-aminopropyl triethoxysilane and 3-aminopropyl trimethoxysilane, the acylating agent in step 2) is one or more of chloroacetyl chloride, bromoacetyl chloride and bromoacetyl bromide, and the acrylic acid ester monomer in step 3) is one or more of ethyl acrylate and methyl acrylate.

5. The PET material for the plastic goblets as defined in claim 1, wherein the concentration of the sodium hydroxide aqueous solution in the step 3) is 1-2 mol/L, and the volume ratio of the sodium hydroxide aqueous solution to the methanol in the mixed solution is (1:2) - (2:1).

6. The plastic goblet processing and shaping process according to any one of claims 1 to 5, characterized by comprising the steps of:

7. A process for forming a plastic goblet according to claim 6, characterized in that the blow mould comprises a body with a mould cavity into which the goblet is introduced, a fixing part comprising an upper mould (20) and a lower mould (30), wherein the upper mould (20) and the lower mould (30) are clamped against each other and define an included angle (31), and a blow mould part comprising a stretching mandrel (10) and a blow tube (11), the blow mould part being arranged in the upper mould (20) and being inserted into the mould cavity.

8. The molding process of plastic goblet processing according to claim 6, wherein the extrusion temperature in step S1 is 240-280 ℃, the screw rotation speed is 50-80 rpm, the molding temperature in step S2 is 250-280 ℃, the preheating temperature is 90-110 ℃, the stretching temperature is 90-100 ℃, the stretching length is 80-90 mm, the blow molding temperature is 100-120 ℃, the pre-blow pressure is 1-1.3 mpa, the high blow pressure is 3.5-4.5 mpa, the injection temperature in step S3 is 260-280 ℃, the injection pressure is 80-120 mpa, the compression bonding temperature in step S4 is 200-230 ℃, and the compression pressure is 0.3-0.5 mpa.