Acetaldehyde scavenger, pet bottle and method for preparing the same

Abstract

The application provides an acetaldehyde removing agent, a PET bottle and a preparation method thereof. The acetaldehyde removing agent comprises a main component, a carrier vegetable fat, a gas silicon dispersing agent and a toning dye; the main component comprises o-aminobenzoic acid and / or o-aminobenzamide and cyclodextrin; the mass percentage of the carrier vegetable fat is 20-80%, the mass percentage of the gas silicon dispersing agent is 1-10%, the mass percentage of the main component is 10-70%, and the mass percentage of the toning dye is 0.5-5%. In the acetaldehyde removing agent, the o-aminobenzoic acid and / or o-aminobenzamide and the cyclodextrin can effectively reduce the acetaldehyde content, and the acetaldehyde removing agent has the advantages of wide applicability and low cost.

Description

Technical Field

[0001] This invention relates to the field of product packaging technology, and in particular to an acetaldehyde removal agent, a PET bottle, and a method for preparing the same. Background Technology

[0002] In recent years, with the improvement of consumption concepts and safety awareness, manufacturers and consumers have become increasingly strict in their requirements for the quality and taste of water. Many high-end water products are now packaged in glass or aluminum cans. However, glass or aluminum can packaging is costly, inconvenient to transport, and has low production efficiency. Glass bottles are also prone to breakage during transportation and sales, posing a potential risk of personal injury. Aluminum can packaging, on the other hand, suffers from problems such as similar appearance and limited capacity.

[0003] PET (polyethylene terephthalate) bottles have emerged to package water beverages. Due to their glass-like transparent appearance, ease of processing, and low cost, different bottle shapes and capacities can be designed according to needs, and different bottle colors can be designed by adding liquid colorants, which greatly expands the sales scope and increases product sales.

[0004] PET processing typically involves two steps: first, dried PET particles are injection molded into preforms of the corresponding specifications; then, the preforms are infrared-heated at around 120°C to blow-dry them into bottles of different sizes. Acetaldehyde is an unavoidable byproduct of PET preform processing. Normally, no additional acetaldehyde is produced within the preform's normal blowing temperature range (107°C–120°C). Therefore, acetaldehyde in the preform is the main factor influencing migration into water; the higher the acetaldehyde content in the preform, the more acetaldehyde will migrate into the water after blowing and filling. Various countries have strict requirements for the acetaldehyde content in PET bottles, but current acetaldehyde removal methods generally suffer from poor effectiveness and high costs. Therefore, how to effectively and economically reduce the acetaldehyde content in PET bottles has become a pressing issue for those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide an acetaldehyde removal agent, a PET bottle, and a method for preparing the same, which has the advantages of good acetaldehyde removal effect, low cost, and greater economy.

[0006] To address the problems in the prior art, in a first aspect, the present invention provides an acetaldehyde removal agent, comprising: a main component, a carrier vegetable oil, a silica dispersant, and a colorant dye; wherein, the main component comprises anthranilic acid and / or anthranilamide and cyclodextrin; wherein,

[0007] The carrier vegetable oil has a mass percentage of 20% to 80%, the silica dispersant has a mass percentage of 1% to 10%, the main component has a mass percentage of 10% to 70%, and the tinting dye has a mass percentage of 0.5% to 5%.

[0008] Optionally, the carrier vegetable oil includes food-grade carrier vegetable oil.

[0009] Optionally, the carrier vegetable oil includes at least one of food-grade castor oil and food-grade epoxidized soybean oil.

[0010] Optionally, the colorant includes food contact grade organic dyes or food contact grade inorganic dyes.

[0011] Secondly, the present invention also provides a method for preparing an acetaldehyde removal agent, the method comprising:

[0012] Weigh the main component, carrier vegetable oil, silica dispersant, and colorant dye according to the following mass parts: 20-80 parts of the carrier vegetable oil, 1-10 parts of the silica dispersant, 10-70 parts of the main component, and 0.5-5 parts of the colorant dye; the main component includes o-aminobenzoic acid and / or o-aminobenzoamide and cyclodextrin.

[0013] The acetaldehyde remover is obtained by mixing the main component, the carrier vegetable oil, the silica dispersant and the color dye and stirring them to form a slurry.

[0014] Optionally, before mixing the main component, the carrier vegetable oil, the silica dispersant, and the color dye to form a slurry, the method further includes grinding the cyclodextrin to a preset particle size.

[0015] Thirdly, the present invention also provides a PET bottle, the material of which includes: PET and the acetaldehyde removal agent as described in the first aspect; wherein...

[0016] The PET component comprises 99.7% to 99.9% by mass, and the acetaldehyde removal agent comprises 0.1% to 0.3% by mass.

[0017] Optionally, the material of the PET bottle may also include antioxidants.

[0018] Fourthly, the present invention also provides a method for preparing a PET bottle, the method comprising:

[0019] The acetaldehyde remover is prepared using the method described in the second aspect.

[0020] PET is provided, and the PET is mixed with the acetaldehyde removal agent in the following proportions, then sliced ​​and plated to obtain plates: the mass percentage of the PET is 99.7% to 99.9%, and the mass percentage of the acetaldehyde removal agent is 0.1% to 0.3%.

[0021] The preform is injected into the plate to obtain a bottle preform.

[0022] Optionally, after obtaining the preform, the method for preparing the PET bottle further includes:

[0023] The preform is heated and blown into a PET bottle to obtain the PET bottle.

[0024] As described above, the acetaldehyde removal agent, PET bottle and preparation method of the present invention have the following beneficial effects: In the acetaldehyde removal agent of the present invention, by adding anthranilic acid and / or anthranilamide and cyclodextrin, the acetaldehyde content can be effectively reduced, which has the advantages of wide applicability and low cost. Attached Figure Description

[0025] Figure 1 The curves showing the change in acetaldehyde content migrating into PET bottles after PET preforms with different acetaldehyde contents are made into PET bottles over time.

[0026] Figure 2 The amount of o-aminobenzamide and cyclodextrin in the acetaldehyde remover of the present invention in different carriers.

[0027] Figure 3 This is a flowchart of the preparation method of the acetaldehyde removal agent provided in Embodiment 1 of the present invention.

[0028] Figure 4 This is a flowchart of the preparation method of the PET bottle provided in Embodiment 2 of the present invention. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] The preferred embodiments described below are merely examples, and other obvious variations will be apparent to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0031] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0032] In recent years, with the improvement of consumption concepts and safety awareness, manufacturers and consumers have become increasingly strict in their requirements for the quality and taste of water. Many high-end water products are now packaged in glass or aluminum cans. However, glass or aluminum can packaging is costly, inconvenient to transport, and has low production efficiency. Glass bottles are also prone to breakage during transportation and sales, posing a potential risk of personal injury. Aluminum can packaging, on the other hand, suffers from problems such as similar appearance and limited capacity.

[0033] PET (polyethylene terephthalate) bottles have emerged to package water beverages. Due to their glass-like transparent appearance, ease of processing, and low cost, different bottle shapes and capacities can be designed according to needs, and different bottle colors can be designed by adding liquid colorants, which greatly expands the sales scope and increases product sales.

[0034] PET processing typically involves two steps: first, dried PET particles are injection molded into preforms of the corresponding specifications; then, the preforms are infrared heated at approximately 120°C to form bottles of different sizes. Acetaldehyde is an unavoidable byproduct of PET preform processing. The molecular formula of PET is [COC6H4COOCH2CH2O]n, containing an aldehyde functional group; the molecular formula of acetaldehyde is CH3CHO. The structural formula of PET is as follows:

[0035]

[0036] The structural formula of acetaldehyde is as follows:

[0037]

[0038] Before use, PET particles are dried at around 170°C for up to 6 hours to thoroughly remove moisture. However, because the melt processing temperature of PET is above 280°C, and the injection screw operates under high pressure, the ester groups of the molten PET long molecular chains in the injection barrel are broken, forming vinyl groups and acid end groups. The vinyl groups are then hydrolyzed into acid end groups and vinyl alcohol. Vinyl alcohol and acetaldehyde are in a tautomeric equilibrium state, as shown below:

[0039]

[0040] Normally, no additional acetaldehyde is produced when the preform is in the normal blow molding temperature range (107℃~120℃). That is, acetaldehyde in the preform is the main factor affecting migration into water. The higher the acetaldehyde content in the preform, the more acetaldehyde will migrate into the water after blow molding and filling.

[0041] The migration of acetaldehyde from PET packaging into bottled beverages or mineral water follows Fickian's Laws of Diffusion.

[0042] International regulations on acetaldehyde content in PET beverage bottles are very strict. The European Union sets the limit for the total specific migration (SML(T)) of acetaldehyde in food and beverages at 6 ppm (Commission Regulation (EU) No. 10 / 2011, EU 2011). Japan requires it to be no more than 4 ppm, and many water production companies in South Korea even require it to be no higher than 2 ppm. In China, the latest national standard "General Technical Requirements for Polyethylene Terephthalate (PET) Beverage Bottles," which came into effect on July 1, 2022, stipulates that the acetaldehyde content in plastic bottles used for holding drinking water should not exceed 15 ppm.

[0043] The reason why national, industry, and enterprise standards both domestically and internationally set strict upper limits for acetaldehyde levels in PET beverage bottles is twofold. One is food safety, as acetaldehyde poses a potential threat to human health. On October 27, 2017, the International Agency for Research on Cancer (IARC) of the World Health Organization published its latest list of carcinogens, explicitly stating that acetaldehyde, in relation to alcoholic beverage intake, is a Group 1 carcinogen and a Group 2 carcinogen. Another reason is that excessively high acetaldehyde levels can severely affect the taste and flavor of water, as acetaldehyde produces an extremely unpleasant taste experience on the human taste buds. Acetaldehyde dissolved in water has a very low taste threshold—10 ppb for retronasal olfaction and 25 ppb for prenasal olfaction.

[0044] Please see Figure 1 , Figure 1These are curves showing the change in acetaldehyde content migrating into PET bottles after PET preforms with different acetaldehyde contents are manufactured into PET bottles over time. Curve ① shows the change in acetaldehyde content migrating into PET bottles after PET preforms with an acetaldehyde content of 8.3 ppm are manufactured into PET bottles over time; Curve ② shows the change in acetaldehyde content migrating into PET bottles after PET preforms with an acetaldehyde content of 6.3 ppm are manufactured into PET bottles over time; Curve ③ shows the change in acetaldehyde content migrating into PET bottles after PET preforms with an acetaldehyde content of 4.8 ppm are manufactured into PET bottles over time; Curve ④ shows the change in acetaldehyde content migrating into PET bottles after PET preforms with an acetaldehyde content of 3.6 ppm are manufactured into PET bottles over time; Curve ⑤ shows the change in acetaldehyde content migrating into PET bottles after PET preforms with an acetaldehyde content of 2.1 ppm are manufactured into PET bottles over time; and Curve ⑥ shows the change in acetaldehyde content migrating into PET bottles after PET preforms with an acetaldehyde content of 1.0 ppm are manufactured into PET bottles over time.

[0045] Depend on Figure 1 It can be seen that the higher the initial acetaldehyde value of the PET preform, the higher the acetaldehyde value that migrates into the water. In order to control the taste threshold of acetaldehyde in beverages to below 25 ppb, it is necessary to control the AA value of the preform to below 2 ppm as much as possible. This is why so many well-known international mineral water or beverage companies are trying their best to control the acetaldehyde value of preforms or beverage bottles to below 2 ppm.

[0046] Because acetaldehyde affects the taste of water and beverages as well as food safety, how to effectively and economically reduce the acetaldehyde content of PET bottles has become a top priority for those skilled in the art.

[0047] Example 1

[0048] This invention provides an acetaldehyde removal agent, comprising: a main component, a carrier vegetable oil, a silica dispersant, and a colorant dye; the main component comprises anthranilic acid and / or anthranilamide and cyclodextrin; wherein,

[0049] The carrier vegetable oil has a mass percentage of 20% to 80%, the silica dispersant has a mass percentage of 1% to 10%, the main component has a mass percentage of 10% to 70%, and the tinting dye has a mass percentage of 0.5% to 5%.

[0050] The acetaldehyde removal agent of the present invention, by adding anthranilic acid and / or anthranilamide and cyclodextrin, can effectively reduce the acetaldehyde content of PET bottles, and has the advantages of wide applicability and low cost.

[0051] Specifically, the mass percentage of the carrier plant oil can be 20%, 30%, 40%, 50%, 60%, 70%, or 80%, etc.; the mass percentage of the gaseous silica dispersant can be 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10%, etc.; the mass percentage of the main component can be 10%, 20%, 30%, 40%, 50%, 60%, or 70%, etc.; and the mass percentage of the color-correcting dye can be 0.5%, 1%, 2%, 3%, 4%, or 5%, etc.

[0052] As an example, the carrier vegetable oil may include, but is not limited to, food-grade carrier vegetable oil.

[0053] Specifically, the carrier vegetable oil may include, but is not limited to, at least one of food-grade castor oil and food-grade epoxidized soybean oil.

[0054] More specifically, the carrier vegetable oil can be food-grade castor oil, food-grade epoxidized soybean oil, or a mixture of both.

[0055] As an example, the color dye may include, but is not limited to, food contact grade organic dyes or food contact grade inorganic dyes.

[0056] In this embodiment, the acetaldehyde removal agent carrier resin uses food-grade vegetable oil as an example, preferably one or a mixture of food-grade castor oil and epoxidized soybean oil. Using food-grade vegetable oil, compared to traditional polyester polyols and plasticizers such as DOA, DEHP, and DINP, not only ensures higher food safety but also has a higher tolerance for anthraquinone, anthraquinone amide, and cyclodextrin. Figure 2 As shown, this makes it easier to design the acetaldehyde removal agent formulation and improve the stability of the final product.

[0057] The acetaldehyde remover described in this embodiment mainly consists of anthranilic acid or anthranilamide and polyfunctional organic substances such as cyclodextrin. One of them or a mixture of them can react with acetaldehyde.

[0058] Anthranilates are considered safe and effective raw materials for removing aldehyde groups. They can capture acetaldehyde molecules released during decomposition in the injection molding machine barrel, and can significantly reduce the acetaldehyde content in the preform at a low addition ratio. The specific reaction mechanism is as follows:

[0059] R-NH2+CH3CHO→R-NCH2+H2O

[0060]

[0061] This reaction can also be carried out at room temperature, and there will be no reverse reaction to decompose acetaldehyde. This type of reaction is applicable not only to liquid phases but also to solid and gas phases.

[0062] Anthranilamide complies with food safety regulations in my country and Europe and the United States, but its use is subject to very clear restrictions. my country's national food safety standard GB9685-2016, "Standard for the Use of Additives in Food Contact Materials and Articles," specifies a specific migration limit (SML) of 0.05 mg / kg for anthranilamide. European Plastics Regulation No. 10 / 2011 (EU 2011) approves anthranilamide as an additive for use in PET bottles for water and beverages, with the same SML limit of 50 μg / L. In the United States, according to General Food Contact Code 137 (FCN, 2001), 2-aminobenzamide is also permitted as an acetaldehyde remover in PET packaging for food and beverages. However, it is explicitly stipulated that the content in bottles containing drinking water should not exceed 500 mg / kg; and in bottles containing non-aqueous beverages, acidic or low-alcohol food and beverages, the content should not exceed 250 mg / kg, meaning the addition ratio in the bottle should not exceed 0.025%. This is because containing acidic beverages or alcoholic food and beverages leads to more intense migration of an-aminobenzamide, and migration also increases if the storage temperature is high. Under these specific conditions, the specific migration limit (SML) is likely to exceed the regulatory migration limit of 50 μg / L. At such a low addition ratio, it is difficult to effectively remove most of the acetaldehyde. The unique feature of this invention is the introduction of a relatively effective and food-safe acetaldehyde remover—cyclodextrin—in combination with an-aminobenzamide to improve the acetaldehyde removal effect.

[0063] Cyclodextrin is a white crystalline organic compound, also known as cyclohexose or cyclic maltohexose. Due to its non-toxic and harmless nature, it is widely used in food, medicine, cosmetics, and fragrances. The unique structure of cyclodextrin—lipophilic inner lumen and hydrophobic outer lumen—gives it a strong ability to form complexes with many active ingredients (such as aromatics, aldehydes, alcohols, halides, carboxylic acids, and esters) through weak van der Waals forces. After complexation, its stability, volatility, solubility, and reactivity are all improved. Cyclodextrin can remove odors and harmful components, such as removing most of the cholesterol in egg yolks and cream. It can improve food processing and quality; for example, in the processing of tea beverages, it can effectively inhibit the formation of low-temperature turbidity in tea soup without destroying nutrients such as tea polyphenols and amino acids. Cyclodextrin can also be used for emulsification and foaming, moisture prevention and hydration, and to restore dehydrated vegetables. In the pharmaceutical industry, cyclodextrin can form encapsulation compounds with drugs, stabilizing unstable drugs and soluble (solubilizing) poorly soluble or insoluble drugs. Cyclodextrin can also regulate gastrointestinal function, improve constipation, prevent and improve diabetes, and improve the stability of additives.

[0064] This invention utilizes the inclusion and complexing properties of cyclodextrin to form a complex with acetaldehyde molecules. The process is as follows:

[0065]

[0066] Please see Figure 3 This embodiment also provides a method for preparing an acetaldehyde removal agent, the method comprising:

[0067] S10: Weigh the main component, carrier vegetable oil, silica dispersant and color dye according to the following mass parts: 20-80 parts of the carrier vegetable oil, 1-10 parts of the silica dispersant, 10-70 parts of the main component, and 0.5-5 parts of the color dye; the main component includes o-aminobenzoic acid and / or o-aminobenzoamide and cyclodextrin;

[0068] S11: The main component, the carrier vegetable oil, the silica dispersant and the color dye are mixed and stirred to form a stirred slurry, which yields the acetaldehyde remover.

[0069] Specifically, in step S10, the mass fraction of the carrier plant oil is 20 parts, 30 parts, 40 parts, 50 parts, 60 parts, 70 parts, or 80 parts, etc.; the mass fraction of the gaseous silica dispersant can be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, or 10 parts, etc.; the mass fraction of the main component can be 10 parts, 20 parts, 30 parts, 40 parts, 50 parts, 60 parts, or 70 parts, etc.; and the mass fraction of the color-correcting dye can be 0.5 parts, 1 part, 2 parts, 3 parts, 4 parts, or 5 parts, etc.

[0070] As an example, the carrier vegetable oil may include, but is not limited to, food-grade carrier vegetable oil.

[0071] Specifically, the carrier vegetable oil may include, but is not limited to, at least one of food-grade castor oil and food-grade epoxidized soybean oil.

[0072] More specifically, the carrier vegetable oil can be food-grade castor oil, food-grade epoxidized soybean oil, or a mixture of both.

[0073] As an example, the color dye may include, but is not limited to, food contact grade organic dyes or food contact grade inorganic dyes.

[0074] As an example, before mixing the main component, the carrier vegetable oil, the silica dispersant and the color dye to form a slurry (i.e., between step S10 and step S11), the method further includes: grinding the cyclodextrin to a preset particle size.

[0075] Specifically, the grinding of the cyclodextrin can be carried out in a high-speed grinder.

[0076] In one example, in step S11, the carrier plant oil can be added to the mixing tank first, then the main component can be added, then the silica dispersant can be added slowly, and finally the weighed color dye can be added.

[0077] Example 2

[0078] Please combine Figure 2 and Figure 3 This embodiment also provides a PET bottle, the material of which includes: PET and the acetaldehyde removal agent as described in Example 1; wherein,

[0079] The PET component comprises 99.7% to 99.9% by mass, and the acetaldehyde removal agent comprises 0.1% to 0.3% by mass.

[0080] Specifically, the mass percentage of PET can be 99.7%, 99.8%, or 99.9%, etc.; the mass percentage of acetaldehyde remover can be 0.1%, 0.2%, or 0.3%, etc.

[0081] Optionally, the material of the PET bottle may also include, but is not limited to, antioxidants.

[0082] As an example, please combine Figures 2 to 3 See Figure 4 This embodiment also provides a method for preparing a PET bottle, the method comprising:

[0083] S20: The acetaldehyde remover is prepared using the preparation method of the acetaldehyde remover described in Example 1;

[0084] S21: Provide PET, mix the PET with the acetaldehyde removal agent in the following proportions, slice and plate them to obtain plates: the mass percentage of the PET is 99.7% to 99.9%, and the mass percentage of the acetaldehyde removal agent is 0.1% to 0.3%;

[0085] S22: Inject the preform into the plate to obtain a bottle preform.

[0086] Specifically, dried PET chips are used to make plates and inject preforms according to the standard ratio. The plates are compared with standard sample plates with the same proportion of acetaldehyde removal agent on a chromatograph. Based on the differences in the test results, an appropriate amount of dye is added to adjust the color. The preforms are crushed in liquid nitrogen and the acetaldehyde value is measured by headspace method and compared with the standard range. If the index is abnormal, the addition ratio and amount of effective ingredients are checked and fine-tuned until the acetaldehyde value is within the standard range.

[0087] Furthermore, after all indicators are passed, a small sample of the finished acetaldehyde removal agent from this batch is retained, labeled and noted, and then repackaged.

[0088] As an example, after obtaining the preform, the method for preparing the PET bottle further includes:

[0089] S23: Heat the preform and blow-dry it to obtain the PET bottle.

[0090] Specifically, different proportions of acetaldehyde remover can be added according to actual needs to achieve a rapid and effective reduction in the acetaldehyde value of the bottle preform.

[0091] Compared to existing products, the acetaldehyde remover of this invention is lower in cost and more economical, thereby reducing the production cost of PET packaging.

[0092] In this embodiment, by adding the acetaldehyde remover of the present invention to the PET bottle, the problem of high acetaldehyde value in PET packaging material is effectively solved, thus focusing on human health and improving the quality of water and beverages.

[0093] In one example, the production process of PET beverages can generally be divided into preform injection, blow molding, sterilization and filling, labeling, and packaging. Before preform injection, PET chips need to be dehumidified and dried at around 170°C for about 6 hours before entering the injection molding machine screw. The screw temperature of the injection molding machine is generally between 280°C and 300°C. At this temperature, the PET chips melt and are then sheared and pushed by the screw into the hot runner and mold to be injection molded into preforms. Under high temperature and high shear force, PET will thermally degrade and hydrolyze to release acetaldehyde molecules. Acetaldehyde removal agents mainly react with acetaldehyde molecules in this process, effectively reducing the acetaldehyde content in the preforms and bottles, thereby reducing food safety risks and improving the taste and quality of beverages or mineral water.

[0094] In one example, food-grade vegetable oil was used as the carrier, preferably one or a mixture of food-grade castor oil and epoxidized soybean oil. Five samples were prepared, with 100 grams as one test unit. Sample F1 was a pure PET slice without added carrier oil or acetaldehyde remover, serving as a reference. Samples F2 to F6, in addition to 100 grams of carrier oil, included: F2 with 50 grams of o-aminobenzamide, F3 with 50 grams of cyclodextrin, F4 with 25 grams of o-aminobenzamide and 25 grams of cyclodextrin, F5 with 40 grams of o-aminobenzamide and 10 grams of cyclodextrin, and F6 with 45 grams of o-aminobenzamide and 5 grams of cyclodextrin, as shown in Table 1 below (unit: grams).

[0095] castor oil 0 50 50 50 50 50 Epoxidized soybean oil 0 50 50 50 50 50 o-aminobenzamide 0 50 0 25 40 45 Cyclodextrin 0 0 50 25 10 5 total 0 150 150 150 150 150

[0096] Table 1 shows the components and contents of each substance F1-F6.

[0097] Select a bottle-grade PET resin (e.g., Yuanfang CB602), and after thorough drying (e.g., drying at 170℃ for 6 hours), F1 is directly blow-molded using the dried PET preform. For formulations F2 to F6, weigh out 1 gram each (0.1% addition ratio), mix them thoroughly with 1000 grams of dried PET particles, and add them to an injection molding machine under the same preformation process conditions to form preforms of the same specification. Thorough preformation transition is required between different formulations to avoid the influence of residual remover in the screw on the resin testing. Then, for each of the six different preforms, select at least three pieces of the same mold cavity number, cut the same part of the preform, cool it in liquid nitrogen, remove it, crush it, and test the acetaldehyde content using the headspace method. Take the average acetaldehyde content of each type of preform. Simultaneously, blow-blow molds are made for the above six preforms, and at least three bottles of each type are selected to test their AA value (acetaldehyde content) and L value (transparency). The results are shown in Table 2 below.

[0098] AA value (ppm) 18.52 5.56 6.83 5.74 5.22 5.65 AA decreased (%) 0 69.98％ 63.12％ 69.01％ 71.81％ 69.49％ L value 95.55 92.33 87.65 89.73 92.16 91.72 The effect of L value (%) 0 -3.37％ -8.27％ -6.09％ -3.55％ -4.01％

[0099] Table 2 shows the AA and L values ​​of PET bottles obtained after injection molding and blow molding of each of the F1-F6 materials.

[0100] As shown in Table 2, the bottles with added o-aminobenzoamide had a smaller impact on the L value and were better at removing acetaldehyde than those with the same proportion of cyclodextrin. Even when o-aminobenzoamide and cyclodextrin were mixed in a certain ratio, they still showed good acetaldehyde removal. However, the acetaldehyde removal effect varied depending on the mixing ratio. Both excessively high and low cyclodextrin ratios affected the acetaldehyde removal performance of the mixture. Among the simulated ratios, a 4:1 ratio of o-aminobenzoamide to cyclodextrin showed the best acetaldehyde removal effect and had a relatively small impact on the bottle's transparency, making it a relatively preferred ratio.

[0101] The dispersant stabilizer is added primarily to effectively and evenly disperse anthranilic acid or anthranilamide and cyclodextrin in the vegetable oil. The dye's role is to adjust the final product's L value, a value (red hue transparency), and b value (blue hue transparency) to ensure the consistency of color appearance in each batch of product after preform and blow molding. All ingredients in the above formula comply with FDA, GB9685, and other food safety regulations.

[0102] If only food-grade vegetable oils are used as a carrier, and a certain proportion of anthranilic acid or anthranilamide and a mixture of cyclodextrin are added to dried PET preforms at a ratio of 0.1%-0.3%, the bottle will have a certain yellow tint compared to a standard bottle without additives. Adding specific organic dyes can significantly reduce the yellow tint and improve the transparency and aesthetics of the bottle. If higher transparency is required, antioxidants can be added, including but not limited to primary antioxidants such as hindered phenolic antioxidants (1010, 1076, 2246, BHT, etc.), secondary antioxidants such as phosphite antioxidants (168, 626, 627, DLTP, DSTP, etc.), and mixed antioxidants of both.

[0103] Using the same food-grade vegetable oil system as a carrier (preferably one or a mixture of food-grade castor oil and epoxidized soybean oil), o-aminobenzamide, cyclodextrin, dye violet and antioxidant were weighed according to different proportions to prepare the following seven different formulation schemes. After being stirred evenly at high speed, they were set aside for use (unit: grams). The components and contents of each scheme are shown in Table 3 below.

[0104]

[0105] Table 3 shows the components and their contents in each of the schemes F7-F13.

[0106] Select a bottle-grade PET resin (e.g., Yuanfang CB602), and after thorough drying (e.g., drying at 170℃ for 6 hours), weigh out 1000 grams of each. F7 is a bottle blown from dried pure PET preform. F8-F13 are different slurries. After stirring evenly, weigh out 1 gram and mix it with the dried PET at a ratio of 0.1%. Then add it to the injection molding machine for preform blow molding. Detect the a value, b value, and L value of the bottle. The results are shown in Table 4 below.

[0107] value of a -1.28 -1.31 -1.30 -1.27 -1.24 -1.29 -1.29 b value 2.80 2.65 3.05 3.11 2.57 3.02 3.08 L value 95.55 92.33 93.14 94.45 92.16 92.93 94.17

[0108] Table 4 shows the a, b, and L values ​​of PET bottles obtained after injection molding and blow molding for each scheme (F7-F13).

[0109] As can be seen from the test results in Table 4, the addition of organic dye (Dye Violet SV13) helps to improve the blue hue transparency b value and transparency L value of the final product. After adding a certain ratio of antioxidant and organic dye, both the b value and L value are significantly improved, which plays a very effective role in improving the transparency and aesthetics of the final product.

[0110] The beneficial effects of the present invention will be further explained and illustrated below through actual embodiments:

[0111] For a mineral water project of a certain client NX, the bottle weighs 18 grams, has a wall thickness of 0.3 mm, a capacity of 500 ml, and contains 0.15% acetaldehyde remover. The rest is PET resin. The acetaldehyde value of the bottle preform was reduced from 3.89 ppm to 1.27 ppm, which fully meets the AA value quality control standard required by the client's headquarters technical center. In addition, the appearance, toughness, physical properties and other performance indicators of the bottle meet the client's own internal control standards.

[0112] Another client, KL, has a mineral water project that exports overseas. The bottles weigh 16 grams and have a wall thickness of 0.3 mm. By adding 0.12% of our acetaldehyde remover, with the remainder being PET resin, the acetaldehyde value of the bottle preforms dropped from 12-15 ppm to below 5 ppm, fully meeting the end customer's AA value quality control requirements. Furthermore, the bottle's appearance, toughness, physical properties, and other performance indicators all meet the customer's internal control standards. This customer had previously used an imported acetaldehyde remover at the same dosage, but its unit price was very high. Using our product can save the customer nearly one million yuan in material costs annually.

[0113] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0114] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An acetaldehyde removal agent, characterized in that, include: Main components, carrier vegetable oil, silica dispersant and colorant dye; The main components include o-aminobenzamide and cyclodextrin, wherein the mass ratio of o-aminobenzamide to cyclodextrin is 4:1; wherein... The carrier vegetable oil has a mass percentage of 20% to 80%, the silica dispersant has a mass percentage of 1% to 10%, the main component has a mass percentage of 10% to 70%, and the color dye has a mass percentage of 0.5% to 5%.

2. The acetaldehyde removal agent according to claim 1, characterized in that, The carrier vegetable oil includes food-grade carrier vegetable oil.

3. The acetaldehyde removal agent according to claim 2, characterized in that, The carrier vegetable oil includes at least one of food-grade castor oil and food-grade epoxidized soybean oil.

4. The acetaldehyde removal agent according to any one of claims 1 to 3, characterized in that, The color-matching dyes include food contact grade organic dyes or food contact grade inorganic dyes.

5. A method for preparing an acetaldehyde removal agent, characterized in that, include: Weigh the main component, carrier vegetable oil, silica dispersant, and colorant dye according to the following mass parts: 20-80 parts of the carrier vegetable oil, 1-10 parts of the silica dispersant, 10-70 parts of the main component, and 0.5-5 parts of the colorant dye; the main component includes o-aminobenzamide and cyclodextrin, and the mass ratio of o-aminobenzamide to cyclodextrin is 4:

1. The acetaldehyde remover is obtained by mixing the main component, the carrier vegetable oil, the silica dispersant and the color dye and stirring them to form a slurry.

6. The method for preparing the acetaldehyde removal agent according to claim 5, characterized in that, Before mixing the main component, the carrier vegetable oil, the silica dispersant and the color dye to form a slurry, the method further includes: grinding the cyclodextrin to a preset particle size.

7. A PET bottle, characterized in that, The material of the PET bottle includes: PET and the acetaldehyde removal agent as described in any one of claims 1 to 4; wherein... The PET has a mass percentage of 99.7% to 99.9%, and the acetaldehyde remover has a mass percentage of 0.1% to 0.3%.

8. The PET bottle according to claim 7, characterized in that, The PET bottle material also includes antioxidants.

9. A method for preparing a PET bottle, characterized in that, include: The acetaldehyde remover is prepared using the preparation method of the acetaldehyde remover as described in claim 5 or 6; PET is provided, and the PET is mixed with the acetaldehyde removal agent in the following proportions, then sliced ​​and plated to obtain plates: the mass percentage of the PET is 99.7%~99.9%, and the mass percentage of the acetaldehyde removal agent is 0.1%~0.3%; The preform is injected into the plate to obtain a bottle preform.

10. The method for preparing a PET bottle according to claim 9, characterized in that, After obtaining the preform, the process further includes: The preform is heated and blown into a PET bottle to obtain the PET bottle.

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