A biomass reactive hydroxycarboxylate deodorant for plastics, its preparation method and application

Abstract

The present invention provides a biomass reactive hydroxycarboxylate deodorant for plastics. The biomass reactive hydroxycarboxylate deodorant for plastics comprises the following raw materials in parts by weight: 55 - 70 parts of modified epoxy soybean oil, 10 - 18 parts of gluconic acid, 15 - 20 parts of zinc ricinoleate, 15 - 20 parts of plant extract, and 5 - 10 parts of natural antibacterial agent. This biomass reactive hydroxycarboxylate deodorant for plastics has good compatibility with plastics, has a good deodorizing effect, can play a steric hindrance role at the same time, prevent the adsorption between particles, and play the functions of a surfactant and a dispersant. It is convenient to use and cost-saving, and has good application prospects in the field of plastic processing technology.

Description

Technical Field

[0001] The invention relates to the technical field of plastic processing, and in particular to a biomass reactive hydroxycarboxylate deodorant for plastics, and a preparation method and application thereof. Background Art

[0002] Plastics are polymer compounds that are made from monomers through addition polymerization or condensation polymerization. They have a medium resistance to deformation, between fiber and rubber. They are composed of synthetic resins and additives such as fillers, plasticizers, stabilizers, lubricants, colorants and deodorants. The main component of plastics is resin, which refers to polymer compounds that have not been mixed with various additives, accounting for about 40% to 100% of the total weight of plastics. The basic properties of plastics are mainly determined by the nature of the resin, but additives also play an important role. There are many types of plastics, the most common of which are polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), acrylonitrile-butadiene-styrene copolymers (ABS) and polyethylene terephthalate (PET).

[0003] Plastic products are widely used in various fields of daily life, including automobiles (vehicle interiors, seals, floor mats), construction, packaging, synthetic leather, medical supplies, etc., and are closely related to people's daily lives. A large number of additives are used in the preparation of plastics, such as antioxidants, mineral fillers, antioxidants, acid scavengers, scratch resistant agents, lubricants, compatibilizers, nucleating agents, etc. The addition of these additives will inevitably introduce VOC small molecules and increase the smell of plastics. In a high temperature environment, the various chemical components in plastics will decompose rapidly and emit a pungent chemical odor. In order to reduce costs, some plastic products often add recycled waste materials of unknown composition in production. These materials carry ethylene, hydrogen sulfide, sulfur dioxide, amines, ammonia odor or other odors. Part of the odor is released after the product is stored for a period of time; the other part lurks in the plastic products. These harmful gases are released during secondary processing, forming the odor of plastics. These harmful odors and odors not only seriously affect the production environment, but also reduce product quality and product grade, and at the same time constitute potential harm to the environment and humans. As people's environmental awareness and health awareness continue to increase, they require daily products to become greener and more environmentally friendly. Eliminating odor in plastic products has become one of the key areas of focus for researchers.

[0004] To remove the odor of plastics, odor removers are generally added during the preparation process. Odor removers include physical odor removers, chemical odor removers, microbial odor removers, plant odor removers, and composite odor removers. Their action mechanisms are generally mainly physical action and chemical chelation, which can effectively remove or reduce the odor released during the processing and use of plastics. However, some current plastic odor removers have average deodorizing effects and high prices, resulting in increased production costs. Some can remove odors and make the produced plastics meet the standards, but the added chemical odor removers may cause secondary pollution. Chinese Patent CN104177654A discloses a regenerated plastic composite deodorant, which uses zinc oxide as an acidic neutralizer, a mixture of expanded perlite, diatomaceous earth, and borax as a porous adsorbent, a mixture of ethylenediamine hydrogen succinate, ethylenediaminetetraacetate, and ethanol diglycine as a metal chelating agent, a mixture of activated carbon, natural zeolite, and attapulgite clay mixed in any proportion as an adsorbent, alumina as an adsorbent, desiccant, and enhancer, aluminosilicate as an adsorbent, and glycerol monostearate as a binder. After various raw materials are mixed in proportion, they are placed in a mixer and stirred evenly, then activated at high temperature and cooled to room temperature, and stored in bags after being vacuum-sealed. When in use, the deodorant is mixed evenly with plastic powder, and regenerated plastic can be prepared according to the conventional plastic preparation process. The usage amount of the deodorant is one ten-thousandth to five ten-thousandths of the weight of the plastic powder. This regenerated plastic has a complex formula, high cost, and a very small addition amount, making it difficult to mix evenly. Chinese Patent CN107556532A provides a rubber and plastic deodorant, which is prepared from natural ores such as zeolite, tourmaline, diatomaceous earth, hexacyclic stone, calcite, shell powder, and medical stone. It has a large adsorption capacity and low cost, but the deodorizing effect needs to be further improved.

[0005] Therefore, in order to better meet the needs of actual production and application, it is necessary to provide a deodorant with good deodorizing effect, low cost, convenient use, and no secondary pollution. Summary of the Invention

[0006] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a deodorant with good deodorizing effect, low cost, convenient use, and no secondary pollution to meet the needs of actual production and application.

[0007] To achieve this purpose, the technical solution of the present invention is as follows:

[0008] The present invention provides a biomass reactive hydroxycarboxylate deodorant for plastics, and the biomass reactive hydroxycarboxylate deodorant for plastics comprises the following raw materials in parts by weight: 55 - 70 parts of modified epoxy soybean oil, 10 - 18 parts of gluconic acid, 15 - 20 parts of zinc ricinoleate, 15 - 20 parts of plant extract, and 5 - 10 parts of natural antibacterial agent.

[0009] In some embodiments of the present invention, the structure of the modified epoxy soybean oil is as follows:

[0010]

[0011] Wherein, L is a straight-chain alkylene group with 1 to 10 carbon atoms, and one -CH2- in the straight-chain alkylene group with 1 to 10 carbon atoms can be independently replaced by -CH=CH-; R is any one of Zn, Ti, and Ce.

[0012] In some embodiments of the present invention, the preparation method of the modified epoxy soybean oil comprises the following steps:

[0013] (1) Dissolve the metal salt in deionized water to prepare a metal salt solution for later use;

[0014] (2) Add the epoxy soybean oil to a solvent, heat it up, and then add a dibasic acid, and keep the temperature for reaction;

[0015] (3) Add the solution obtained in step (2) to the metal salt solution prepared in step (1), stir and mix evenly, keep the temperature for continuous reaction, and the product obtained after the reaction is the modified epoxy soybean oil.

[0016] In the preparation method of the modified epoxy soybean oil of the present invention, the molar ratio of the epoxy soybean oil, the dibasic acid, and the metal salt is 1:5 - 7:2 - 4 (for example, it can be 1:5:2, 1:5:3, 1:5:4, 1:6:2, 1:6:3, 1:6:4, 1:7:2, 1:7:3, 1:7:4 or any value therebetween).

[0017] In the preparation method of the modified epoxy soybean oil of the present invention, the metal salt in step (1) is selected from one or a combination of zinc salts, cerium salts, and titanium salts; the concentration of the metal salt solution is 1 - 2 mol / L (for example, it can be 1 mol / L, 1.1 mol / L, 1.2 mol / L, 1.3 mol / L, 1.4 mol / L, 1.5 mol / L, 1.6 mol / L, 1.7 mol / L, 1.8 mol / L, 1.9 mol / L, 2 mol / L or any value therebetween). Preferably, the zinc salt is selected from one or a combination of zinc hydroxide, zinc acetate, zinc chloride, zinc nitrate, and zinc sulfate; the cerium salt is selected from one or a combination of cerium acetate, cerium nitrate, cerium hydroxide, and cerium chloride; the titanium salt is selected from one or a combination of titanium hydroxide, titanium sulfate, titanium chloride, and titanium nitrate.

[0018] In the preparation method of the modified epoxy soybean oil of the present invention, the solvent described in step (2) is selected from one or a combination of toluene, methanol, ethanol, hexane, and carbon tetrachloride; the reaction temperature is 100-110°C (for example, it can be 100°C, 101°C, 102°C, 103°C, 104°C, 105°C, 106°C, 107°C, 108°C, 109°C, 110°C or any temperature value therein); the dibasic acid is selected from any one of maleic acid, adipic acid, suberic acid, and sebacic acid.

[0019] In the preparation method of the modified epoxy soybean oil of the present invention, the reaction temperature described in step (3) is 40-60°C (for example, it can be 40°C, 41°C, 42°C, 43°C, 44°C, 45°C, 46°C, 47°C, 48°C, 49°C, 50°C, 51°C, 52°C, 53°C, 55°C, 55°C, 56°C, 57°C, 58°C, 59°C, 60°C or any temperature value therein).

[0020] In some embodiments of the present invention, the plant extract is selected from one or a combination of lemon extract, seaweed extract, green tea extract, and mint extract.

[0021] In some embodiments of the present invention, the natural antibacterial agent is selected from one or a combination of naringenin, eugenol, chitin, and tea polyphenols.

[0022] A preparation method of a biomass reactive hydroxycarboxylate deodorant for plastics, the preparation method of the biomass reactive hydroxycarboxylate deodorant for plastics includes the following steps:

[0023] (1) Add gluconic acid, zinc ricinoleate, and natural antibacterial agent to the modified epoxy soybean oil and mix, then raise the temperature and continue stirring;

[0024] (2) Add the plant extract to the solution obtained in step (1), continue stirring, and let it stand for 1-2 h after mixing evenly to obtain the biomass reactive hydroxycarboxylate deodorant for plastics.

[0025] In some embodiments of the present invention, the temperature described in step (1) is 40-60°C (for example, it can be 40°C, 41°C, 42°C, 43°C, 44°C, 45°C, 46°C, 47°C, 48°C, 49°C, 50°C, 51°C, 52°C, 53°C, 55°C, 55°C, 56°C, 57°C, 58°C, 59°C, 60°C or any temperature value therein).

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The biomass reactive hydroxycarboxylate deodorant for plastics provided by the present invention uses modified epoxy soybean oil, which can undergo condensation and neutralization reactions with odor substances such as ammonia and mercaptan to remove the odor substances. At the same time, the modified epoxy soybean oil has a special long-chain structure and has good compatibility with plastics, enabling the biomass reactive hydroxycarboxylate deodorant for plastics to have good deodorizing ability.

[0028] (2) The biomass reactive hydroxycarboxylate deodorant for plastics provided by the present invention uses a compound of modified epoxy soybean oil, gluconic acid, zinc ricinoleate, and natural antibacterial agent, which exerts a good synergistic effect and effectively enhances the ability of the biomass reactive hydroxycarboxylate deodorant for plastics to remove odors. Among them, gluconic acid can react with substances such as ammonia and mercaptan to remove odors, zinc ricinoleate can remove sulfur-containing compounds, and the natural antibacterial agent can effectively improve the deodorizing effect of modified epoxy soybean oil and enhance zinc ricinoleate, making the deodorizing ability of the biomass reactive hydroxycarboxylate deodorant for plastics better.

[0029] (3) The biomass reactive hydroxycarboxylate deodorant for plastics provided by the present invention uses modified epoxy soybean oil with a main structure of a multi-branched chain structure. There are hydrophilic hydroxyl groups, salts, and hydrophobic long carbon chain parts in the system, which can play a steric hindrance role to prevent the adsorption between particles and function as a surfactant and a dispersant. Therefore, in practical applications, there is no need to add auxiliaries such as surfactants and dispersants, which can effectively save production costs and is more simple and convenient to use. It is a convenient and resource-saving technical solution.

[0030] (4) The biomass reactive hydroxycarboxylate deodorant for plastics provided by the present invention uses biomass raw materials instead of petroleum-refined products, which will not cause secondary pollution, is harmless to humans, and has good environmental protection. It is an environmentally friendly technical solution. Specific Embodiments

[0031] The following will describe the present invention in conjunction with specific implementation examples. It should be noted that the following examples are examples of the present invention and are only used to illustrate the present invention, rather than to limit the present invention. Other combinations and various improvements within the concept of the present invention can be made without departing from the main idea or scope of the present invention.

[0032] In the following examples, the compounds and related reagents used can be purchased from the market. Among them, epoxy soybean oil (CAS: 8013-07-8) was purchased from Shanghai Macklin Biochemical Co., Ltd.

[0033] Preparation of Modified Epoxy Soybean Oil I

[0034] The preparation method is as follows:

[0035] (1) Dissolve 3 mol of zinc hydroxide in 2 L of deionized water to prepare a zinc hydroxide solution for standby;

[0036] (2) Add 1 mol of epoxidized soybean oil to toluene, heat up to 110 °C, then add 6 mol of succinic acid, and carry out a heat preservation reaction at 110 °C;

[0037] (3) Add the solution obtained in step (2) to the zinc hydroxide solution prepared in step (1), stir and mix evenly, carry out a continuous heat preservation reaction at 55 °C, and the product obtained after the reaction is the modified epoxidized soybean oil I.

[0038] Preparation of Modified Epoxidized Soybean Oil II

[0039] The preparation method is as follows:

[0040] (1) Dissolve 3 mol of cerium hydroxide in 2 L of deionized water to prepare a cerium hydroxide solution for standby;

[0041] (2) Add 1 mol of epoxidized soybean oil to toluene, heat up to 110 °C, then add 6 mol of succinic acid, and carry out a heat preservation reaction at 110 °C;

[0042] (3) Add the solution obtained in step (2) to the cerium hydroxide solution prepared in step (1), stir and mix evenly, carry out a continuous heat preservation reaction at 55 °C, and the product obtained after the reaction is the modified epoxidized soybean oil II.

[0043] Preparation of Modified Epoxidized Soybean Oil III

[0044] The preparation method is as follows:

[0045] (1) Dissolve 3 mol of titanium hydroxide in 2 L of deionized water to prepare a titanium hydroxide solution for standby;

[0046] (2) Add 1 mol of epoxidized soybean oil to toluene, heat up to 110 °C, then add 6 mol of succinic acid, and carry out a heat preservation reaction at 110 °C;

[0047] (3) Add the solution obtained in step (2) to the titanium hydroxide solution prepared in step (1), stir and mix evenly, carry out a continuous heat preservation reaction at 55 °C, and the product obtained after the reaction is the modified epoxidized soybean oil III.

[0048] Preparation of Modified Epoxidized Soybean Oil IV

[0049] The preparation method is as follows:

[0050] (1) Dissolve 3 mol of titanium hydroxide in 2 L of deionized water to prepare a titanium hydroxide solution for standby;

[0051] (2) Add 1 mol of epoxidized soybean oil to toluene, heat up to 110 °C, then add 6 mol of adipic acid, and carry out a heat preservation reaction at 110 °C;

[0052] (3) Add the solution obtained in step (2) to the titanium hydroxide solution prepared in step (1), stir and mix evenly, carry out a continuous reaction while keeping warm at 55 °C, and the product obtained after the reaction is the modified epoxidized soybean oil Ⅳ.

[0053] Preparation of modified epoxidized soybean oil Ⅴ

[0054] The preparation method is as follows:

[0055] (1) Dissolve 3 mol of titanium hydroxide in 2 L of deionized water to prepare a titanium hydroxide solution for standby;

[0056] (2) Add 1 mol of epoxidized soybean oil to toluene, heat up to 110 °C, then add 6 mol of suberic acid, and carry out a heat preservation reaction at 110 °C;

[0057] (3) Add the solution obtained in step (2) to the titanium hydroxide solution prepared in step (1), stir and mix evenly, carry out a continuous reaction while keeping warm at 55 °C, and the product obtained after the reaction is the modified epoxidized soybean oil Ⅴ.

[0058] Preparation of modified epoxidized soybean oil Ⅵ

[0059] The preparation method is as follows:

[0060] (1) Dissolve 3 mol of titanium hydroxide in 2 L of deionized water to prepare a titanium hydroxide solution for standby;

[0061] (2) Add 1 mol of epoxidized soybean oil to toluene, heat up to 110 °C, then add 6 mol of sebacic acid, and carry out a heat preservation reaction at 110 °C;

[0062] (3) Add the solution obtained in step (2) to the titanium hydroxide solution prepared in step (1), stir and mix evenly, carry out a continuous reaction while keeping warm at 55 °C, and the product obtained after the reaction is the modified epoxidized soybean oil Ⅵ.

[0063] Preparation of modified epoxidized soybean oil Ⅶ

[0064] The preparation method is as follows:

[0065] (1) Dissolve 3 mol of titanium hydroxide in 2 L of deionized water to prepare a titanium hydroxide solution for standby;

[0066] (2) Add 1 mol of epoxidized soybean oil to toluene, heat up to 110 °C, then add 6 mol of maleic acid, and carry out a heat preservation reaction at 110 °C;

[0067] (3) Add the solution obtained in step (2) to the titanium hydroxide solution prepared in step (1), stir and mix evenly, keep it warm and continue the reaction at 55 °C. The product obtained after the reaction is the modified epoxy soybean oil VII.

[0068] Preparation of Modified Epoxy Soybean Oil VIII

[0069] The preparation method is as follows:

[0070] (1) Dissolve 3 mol of titanium hydroxide in 2 L of deionized water to prepare a titanium hydroxide solution for standby;

[0071] (2) Add 1 mol of epoxy soybean oil to toluene, heat up to 110 °C, then add 6 mol of succinic acid, and carry out a heat preservation reaction at 110 °C. The product obtained after the reaction is the modified epoxy soybean oil VIII.

[0072] Example 1

[0073] A biomass reactive hydroxycarboxylate deodorant for plastics, the biomass reactive hydroxycarboxylate deodorant for plastics comprises the following raw materials in parts by weight: 70 parts of modified epoxy soybean oil I, 18 parts of gluconic acid, 20 parts of zinc ricinoleate, 20 parts of green tea extract, and 10 parts of naringenin.

[0074] Preparation method:

[0075] (1) Add gluconic acid, zinc ricinoleate, and naringenin to modified epoxy soybean oil I and mix them, raise the temperature to 50 °C, and continuously stir;

[0076] (2) Add green tea extract to the solution obtained in step (1), continuously stir, and after mixing evenly, let it stand for 1 h to obtain the biomass reactive hydroxycarboxylate deodorant for plastics.

[0077] Example 2

[0078] A biomass reactive hydroxycarboxylate deodorant for plastics, the biomass reactive hydroxycarboxylate deodorant for plastics comprises the following raw materials in parts by weight: 70 parts of modified epoxy soybean oil II, 18 parts of gluconic acid, 20 parts of zinc ricinoleate, 20 parts of green tea extract, and 10 parts of naringenin.

[0079] The preparation method is the same as that of Example 1.

[0080] Example 3

[0081] A biomass reactive hydroxycarboxylate deodorant for plastics, the biomass reactive hydroxycarboxylate deodorant for plastics comprises the following raw materials in parts by weight: 70 parts of modified epoxy soybean oil III, 18 parts of gluconic acid, 20 parts of zinc ricinoleate, 20 parts of green tea extract, and 10 parts of naringenin.

[0082] The preparation method is the same as that of Example 1.

[0083] Example 4

[0084] A biomass reactive hydroxycarboxylate deodorant for plastics, the biomass reactive hydroxycarboxylate deodorant for plastics comprising the following raw materials in parts by weight: 70 parts of modified epoxy soybean oil Ⅳ, 18 parts of gluconic acid, 20 parts of zinc ricinoleate, 20 parts of green tea extract, and 10 parts of naringenin.

[0085] The preparation method is the same as that of Example 1.

[0086] Example 5

[0087] A biomass reactive hydroxycarboxylate deodorant for plastics, the biomass reactive hydroxycarboxylate deodorant for plastics comprising the following raw materials in parts by weight: 70 parts of modified epoxy soybean oil Ⅴ, 18 parts of gluconic acid, 20 parts of zinc ricinoleate, 20 parts of green tea extract, and 10 parts of naringenin.

[0088] The preparation method is the same as that of Example 1.

[0089] Example 6

[0090] A biomass reactive hydroxycarboxylate deodorant for plastics, the biomass reactive hydroxycarboxylate deodorant for plastics comprising the following raw materials in parts by weight: 70 parts of modified epoxy soybean oil Ⅵ, 18 parts of gluconic acid, 20 parts of zinc ricinoleate, 20 parts of green tea extract, and 10 parts of naringenin.

[0091] The preparation method is the same as that of Example 1.

[0092] Example 7

[0093] A biomass reactive hydroxycarboxylate deodorant for plastics, the biomass reactive hydroxycarboxylate deodorant for plastics comprising the following raw materials in parts by weight: 70 parts of modified epoxy soybean oil Ⅶ, 18 parts of gluconic acid, 20 parts of zinc ricinoleate, 20 parts of green tea extract, and 10 parts of naringenin.

[0094] The preparation method is the same as that of Example 1.

[0095] Example 8

[0096] A biomass reactive hydroxycarboxylate deodorant for plastics, the biomass reactive hydroxycarboxylate deodorant for plastics comprising the following raw materials in parts by weight: 55 parts of modified epoxy soybean oil Ⅰ, 18 parts of gluconic acid, 20 parts of zinc ricinoleate, 20 parts of green tea extract, and 10 parts of naringenin.

[0097] The preparation method is the same as that of Example 1.

[0098] Example 9

[0099] A biomass reactive hydroxycarboxylate deodorant for plastics, wherein the biomass reactive hydroxycarboxylate deodorant for plastics comprises the following raw materials in parts by weight: 55 parts of modified epoxy soybean oil I, 10 parts of gluconic acid, 20 parts of zinc ricinoleate, 20 parts of green tea extract, and 10 parts of naringenin.

[0100] The preparation method is the same as that of Example 1.

[0101] Example 10

[0102] A biomass reactive hydroxycarboxylate deodorant for plastics, wherein the biomass reactive hydroxycarboxylate deodorant for plastics comprises the following raw materials in parts by weight: 55 parts of modified epoxy soybean oil I, 10 parts of gluconic acid, 15 parts of zinc ricinoleate, 20 parts of green tea extract, and 10 parts of naringenin.

[0103] The preparation method is the same as that of Example 1.

[0104] Example 11

[0105] A biomass reactive hydroxycarboxylate deodorant for plastics, wherein the biomass reactive hydroxycarboxylate deodorant for plastics comprises the following raw materials in parts by weight: 55 parts of modified epoxy soybean oil III, 10 parts of gluconic acid, 15 parts of zinc ricinoleate, 15 parts of green tea extract, and 10 parts of naringenin.

[0106] The preparation method is the same as that of Example 1.

[0107] Example 12

[0108] A biomass reactive hydroxycarboxylate deodorant for plastics, wherein the biomass reactive hydroxycarboxylate deodorant for plastics comprises the following raw materials in parts by weight: 55 parts of modified epoxy soybean oil III, 10 parts of gluconic acid, 15 parts of zinc ricinoleate, 15 parts of green tea extract, and 5 parts of naringenin.

[0109] The preparation method is the same as that of Example 1.

[0110] Comparative Example 1

[0111] A biomass reactive hydroxycarboxylate deodorant for plastics, wherein the biomass reactive hydroxycarboxylate deodorant for plastics comprises the following raw materials in parts by weight: 70 parts of modified epoxy soybean oil VIII, 18 parts of gluconic acid, 20 parts of zinc ricinoleate, 20 parts of green tea extract, and 10 parts of naringenin.

[0112] The preparation method is the same as that of Example 1.

[0113] Comparative Example 2

[0114] A biomass reactive hydroxycarboxylate deodorant for plastics, the biomass reactive hydroxycarboxylate deodorant for plastics comprising the following raw materials in parts by weight: 70 parts of epoxidized soybean oil, 18 parts of gluconic acid, 20 parts of zinc ricinoleate, 20 parts of green tea extract, and 10 parts of naringenin.

[0115] The preparation method is the same as that of Example 1.

[0116] Comparative Example 3

[0117] A biomass reactive hydroxycarboxylate deodorant for plastics, the biomass reactive hydroxycarboxylate deodorant for plastics comprising the following raw materials in parts by weight: 18 parts of gluconic acid, 20 parts of zinc ricinoleate, 20 parts of green tea extract, and 10 parts of naringenin.

[0118] The preparation method is the same as that of Example 1.

[0119] The prepared biomass reactive hydroxycarboxylate deodorant for plastics was added to PP resin at an addition amount of 1% of the mass of the PP resin to obtain a PP resin sample, and then performance tests were carried out. The test methods are as follows:

[0120] (1) Odor evaluation: The PP resin samples prepared in the examples and comparative examples were stored in odor bottles, sealed and placed in an oven, and taken out after being stored at a constant temperature of (80 ± 2) °C for 2 h. After the glass container was stored at room temperature for 5 min and cooled to (60 ± 5) °C, the lid was quickly moved horizontally and the odor was evaluated by the experimenter (the lid could not be lifted). Once completed, the lid was immediately closed again. Each sample required 5 people to evaluate according to the odor grade definition. By using the subjective evaluation method, the odor intensity was generally divided into 6 grades (see Table 1), from no odor to an intolerable odor;

[0121] Table 1 Odor test evaluation criteria

[0122]

[0123] (2) Determination of TVOC: Determined by gas chromatography.

[0124] The determination results are shown in Table 2:

[0125] Table 2 Deodorization effect test results of examples and comparative examples

[0126]

[0127]

[0128] From the comparison of the test results between Comparative Example 3 and Example 1, it can be seen that the biomass reactive hydroxycarboxylate deodorant for plastics prepared in Example 1 effectively removed the odor substances and their odors of the PP resin by using modified epoxy soybean oil and had a lower TVOC value; from the comparison of the test results between Comparative Example 1, Comparative Example 2 and Example 1, it can be seen that only by modifying epoxy soybean oil with dibasic acid and metal salt solution can a good deodorizing effect be exerted; by comprehensively comparing each example and the comparative example, it can be seen that the biomass reactive hydroxycarboxylate deodorant for plastics provided by the present invention, by adding modified epoxy soybean oil and using gluconic acid, zinc ricinoleate and natural antibacterial agent in combination, has good compatibility with plastics, can effectively remove the odor of plastics, and has excellent deodorizing ability. At the same time, the modified epoxy soybean oil is a biomass raw material, its main structure is a multi-branched structure, there are hydrophilic hydroxyl groups, salts and hydrophobic long carbon chain parts in the system, which can play a steric hindrance role, prevent the adsorption between particles, and play the functions of surfactant and dispersant. Therefore, in practical applications, there is no need to add auxiliaries such as surfactants and dispersants, which can effectively save production costs and is more simple and convenient to use. It is a resource-saving and environment-friendly technical solution.

[0129] The above embodiments are only for illustrating the technical concept and characteristics of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it, and it cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A biomass reactive hydroxycarboxylate deodorant for plastics, characterized in that, The biomass reactive hydroxycarboxylate deodorant for plastics comprises the following raw materials in parts by weight: 55-70 parts of modified epoxy soybean oil, 10-18 parts of gluconic acid, 15-20 parts of zinc ricinoleate, 15-20 parts of plant extract, and 5-10 parts of natural antibacterial agent; The modified epoxy soybean oil has the following structure: Wherein, L is a straight-chain alkylene group with 1-10 carbon atoms, and one -CH2- in the straight-chain alkylene group with 1-10 carbon atoms can be independently replaced by -CH=CH-; R is any one of Zn, Ti, and Ce; The preparation method of the modified epoxy soybean oil comprises the following steps: (1) Dissolve the metal salt in deionized water to prepare a metal salt solution for standby; (2) Add epoxy soybean oil into the solvent, heat up, and then add dibasic acid for heat preservation reaction; (3) Add the solution obtained in step (2) into the metal salt solution prepared in step (1), stir and mix evenly, keep the temperature for continuous reaction, and the product obtained after the reaction is completed is the modified epoxy soybean oil.

2. The biomass reactive hydroxycarboxylate deodorant for plastics according to claim 1, characterized in that, The molar ratio of the epoxy soybean oil, dibasic acid, and metal salt is 1:5-7:2-4.

3. The biomass reactive hydroxycarboxylate deodorant for plastics according to claim 1, characterized in that, In step (1), the metal salt is selected from one or a combination of zinc salts, cerium salts, and titanium salts. The concentration of the metal salt solution is 1-2 mol / L. The zinc salt is selected from one or a combination of zinc hydroxide, zinc acetate, zinc chloride, zinc nitrate, and zinc sulfate. The cerium salt is selected from one or a combination of cerium acetate, cerium nitrate, cerium hydroxide, and cerium chloride. The titanium salt is selected from one or a combination of titanium hydroxide, titanium sulfate, titanium chloride, and titanium nitrate. In step (2), the solvent is selected from one or a combination of toluene, methanol, ethanol, hexane, and carbon tetrachloride. The reaction temperature is 100-110 °C. The dibasic acid is any one of maleic acid, adipic acid, suberic acid, and sebacic acid. In step (3), the reaction temperature is 40-60 °C.

4. The biomass reactive hydroxycarboxylate deodorant for plastics according to claim 1, characterized in that, The plant extract is selected from one or a combination of lemon extract, seaweed extract, green tea extract, and mint extract.

5. The biomass reactive hydroxycarboxylate deodorant for plastics according to claim 1, wherein The natural antibacterial agent is selected from one or a combination of naringenin, eugenol, chitin, and tea polyphenols.

6. A preparation method of the biomass reactive hydroxycarboxylate deodorant for plastics according to any one of claims 1-5, characterized in that, Comprises the following steps: Add gluconic acid, zinc ricinoleate, and natural antibacterial agent into the modified epoxy soybean oil for mixing, raise the temperature, and continue stirring; Add the plant extract into the solution obtained in step (1), continue stirring. After mixing evenly, let it stand for 1-2 h to obtain the biomass reactive hydroxycarboxylate deodorant for plastics.

7. The preparation method of the biomass reactive hydroxycarboxylate deodorant for plastics according to claim 6, wherein The temperature in step (1) is 40-60 °C.

8. Application of the biomass reactive hydroxycarboxylate deodorant for plastics according to any one of claims 1-5 in the field of plastic processing and preparation.

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