Organic matting agent and application thereof

Abstract

The invention relates to the technical field of functional aids, and particularly discloses an organic matting agent and application thereof. The organic delustering agent provided by the invention is prepared by mixing and crushing a resin material and a peroxide cross-linking agent; the weight ratio of the resin material to the peroxide cross-linking agent is (95-98): (2-5); the rotating speed of mixing is 20-90 r / min, the temperature is 170-230 DEG C, and the time is 3-5 min; the rotating speed of crushing is 5000 to 50000 r / min; the invention further provides a plastic material prepared from the organic matting agent. The organic matting agent matched with the matrix resin can be obtained by adjusting the resin material type in the organic matting agent according to different matrix resin types, and the dispersion uniformity of the organic matting agent in the matrix resin is greatly improved, so that the reduction of the surface gloss of the material is realized while the mechanical property of the material is ensured.

Description

Technical Field

[0001] This application relates to the field of functional additives technology, specifically to an organic matting agent and its application. Background Technology

[0002] Matting agents, as core additives for regulating the optical properties of material surfaces, have wide applications in coatings, plastics, and other fields. Traditional matting agents are mainly divided into two categories: inorganic matting agents (such as silica and titanium dioxide) and organic matting agents (such as wax-modified resins and synthetic polymers). While inorganic matting agents are inexpensive, they suffer from uneven particle size distribution and dispersion difficulties, often requiring high addition levels of 10-30 wt% to achieve the desired matting effect, and they also significantly impact the mechanical properties of the material. In contrast, organic matting agents exhibit relatively better dispersion performance in base materials and have a relatively smaller impact on the mechanical properties of the material, and have become the mainstream matting agents in the industry in recent years.

[0003] However, organic matting agents still have certain limitations in practical applications. For example, matting agents such as wax-modified silica and styrene-acrylonitrile copolymers are prepared by physical blending, resulting in poor dispersion uniformity and easy agglomeration leading to fluctuations in matting performance. On the other hand, matting agents for cross-linked urea-formaldehyde resin and TGIC curing systems have relatively simple structures and insufficient versatility, and can only be applied to specific resin systems such as polyurethane or epoxy resin. Therefore, phase separation problems are prone to occur when used in cross-system applications, and storage stability is poor.

[0004] Therefore, there is an urgent need to develop an organic matting agent with tunable structure, good dispersibility, and applicability to different matrix resin materials to meet the broad needs of the industry. Summary of the Invention

[0005] In order to overcome the problems of existing matting agents, such as high addition amount, significant impact on the mechanical properties of materials, poor dispersion uniformity, and insufficient versatility, this application provides an organic matting agent and its application.

[0006] In a first aspect, this application provides an organic matting agent, which adopts the following technical solution: An organic matting agent is prepared by mixing and pulverizing a resin material and a peroxide crosslinking agent; the weight ratio of the resin material to the peroxide crosslinking agent is (95-98):(2-5); The mixing speed is 20-90 r / min, the temperature is 170-230℃, and the time is 3-5 min; the pulverizing speed is 5000-50000 r / min.

[0007] This application uses a specific resin as the main material and adds peroxide as a crosslinking agent. Through reactive mixing and pulverization, a crosslinked organic matting agent is prepared. Combining this organic matting agent with other functional additives can improve the matting effect of the base resin while maximally preserving its mechanical properties. This effectively avoids the problem of uneven dispersion leading to decreased mechanical properties and poor matting effect in traditional matting agents. Furthermore, the organic matting agent provided in this application uses readily available raw materials, has a simple process, and can be tailored to different base resin types by adjusting the type of resin material in the organic matting agent. This significantly improves the uniformity of dispersion of the organic matting agent in the base resin. It is not only suitable for matte modification of plastic materials but can also be widely applied in the coatings field, achieving synergistic optimization of matting effect, mechanical properties, and application range, demonstrating broad application prospects.

[0008] This application, by controlling the mixing speed, temperature, and time within the aforementioned ranges, avoids the cross-linked particles from being compressed into hard, large particles, thus increasing the difficulty of pulverization. Furthermore, under these conditions, the cross-linked particles mixed with these parameters achieve a higher sieving rate at the same pulverization speed. While pulverization speed also affects the particle size of cross-linked particles—higher speeds result in smaller particle sizes—the pulverization process is exothermic. Excessive temperature can cause the cross-linked particles to soften after pulverization, making further pulverization difficult and hindering continuous particle size reduction. In extreme speed conditions, dry ice may even be required, complicating the operation. By controlling the mixing and pulverization process parameters within the aforementioned ranges, this application can obtain organic matting agents with a 30-mesh sieving rate ≥85% and a 300-mesh sieving rate ≥15%. Using these organic matting agents to prepare plastic materials effectively avoids the problem of uneven dispersion of the matting agent, significantly improving the matting effect while enhancing the mechanical properties of the plastic material.

[0009] Optionally, the resin material is selected from one or more of polypropylene (PP), polyethylene (PE), polylactic acid (PLA), polyamide (PA), styrene-acrylonitrile copolymer (SAN), and polymethyl methacrylate (PMMA).

[0010] Optionally, the peroxide crosslinking agent is selected from one or more of benzoyl peroxide (BPO), dicumyl peroxide (DCP), and di-tert-butyl peroxide (DTBP).

[0011] In this application, by mixing the resin material with peroxide, the product can be made into a highly cross-linked state. Specifically, when the resin material is polylactic acid (PLA), controlling the mixing time to 3-5 minutes ensures that the mixed sample is in a powder state and does not agglomerate, thus improving the sieving rate after high-speed crushing. Polypropylene (PP) and styrene-acrylonitrile copolymer (SAN) form a melt after mixing. This application, through mixing, achieves cross-linking while retaining reactive groups such as terminal hydroxyl and carboxyl groups in the resin, thereby ensuring the versatility of the matting agent product.

[0012] Optionally, the pulverized material needs to be sieved, and the resulting organic matting agent has a 30-mesh sieve pass rate of ≥85% and a 300-mesh sieve pass rate of ≥15%.

[0013] Secondly, this application provides an application of an organic matting agent in coatings and plastics.

[0014] Thirdly, this application provides a plastic material comprising the following components in parts by weight: 80-91 parts of a matrix resin, 8-12 parts of an organic matting agent as described in any one of claims 1-4, 0-5 parts of a compatibilizer, and 0.1-0.2 parts of an antioxidant; wherein the matrix resin is the same as or similar to the resin material in the organic matting agent.

[0015] Optionally, the compatibilizer is 2-5 parts by weight.

[0016] Optionally, the compatibilizer is Durare 3207 or XIRAN. ® SO26080 or PP-g-MAH; the antioxidant is selected from antioxidant 1010 or antioxidant 168.

[0017] Optionally, when the base resin is polyamide, the resin material in the organic matting agent is polyamide or polylactic acid; when the base resin is styrene-acrylonitrile copolymer, the resin material in the organic matting agent is styrene-acrylonitrile copolymer and / or polylactic acid; when the base resin is polypropylene, the resin material in the organic matting agent is polypropylene, styrene-acrylonitrile copolymer and / or polylactic acid.

[0018] In this application, polylactic acid generally has terminal hydroxyl and terminal carboxyl groups. Its reaction with peroxides does not consume these terminal groups, which can react with compatibilizers containing epoxy or anhydride compounds to form block copolymers. This structure is beneficial for the uniform dispersion of the polyester matting agent in the matrix resin of this invention. If PLA is used as the matting agent for the resin material, its cross-linked structure still has terminal hydroxyl and terminal carboxyl groups on its surface. Regardless of whether it is used in a resin system with good or poor compatibility with PLA, the addition of a compatibilizer can react to form a block copolymer, thereby improving compatibility and promoting dispersion. If a cross-linked organic matting agent prepared using PLA+PA6 is used, it is equivalent to having a portion of PA6 on the surface of the matting agent, further increasing the compatibility and dispersibility of PLA and PA6. Only the addition of a corresponding compatibilizer is needed to make it applicable to different resins such as SAN and PP.

[0019] Fourthly, this application provides a method for preparing a plastic material, comprising the following steps: first, preparing an organic matting agent; then, mixing the organic matting agent with a matrix resin, a compatibilizer, and an antioxidant; and obtaining the plastic material by melt extrusion granulation, drying, and injection molding.

[0020] In summary, this application has the following beneficial effects: 1. This application provides an organic matting agent, the resin material of which can be selected and adjusted according to the type of the target resin matrix. It can select resins that are the same as or similar to the resin matrix as raw materials, and has structural adjustability and wide compatibility. It is not only suitable for matte modification of plastic materials, but can also be widely used in the coating field to achieve synergistic optimization of matting effect, mechanical properties and application range, and has broad application prospects.

[0021] 2. By further combining organic matting agents and compatibilizers, this application enables matting agents to have better dispersibility, maintain better matting effect and mechanical properties, and thus achieve better performance in coatings and plastic products. Detailed Implementation

[0022] This application provides an organic matting agent, the preparation method of which includes the following steps: mixing resin material and peroxide crosslinking agent in a mixer at a weight ratio of (95-98):(2-5), the mixer speed is 20-90 r / min, the temperature is 170-230℃, and the mixing time is 3-5 min; then the mixture is sent to a high-speed pulverizer for pulverization at a speed of 5000-50000 r / min. After pulverization, the mixture is passed through a 300-mesh sieve to obtain the organic matting agent.

[0023] This application also provides a plastic material, the preparation method of which includes the following steps: mixing and stirring an organic matting agent with a matrix resin, a compatibilizer and an antioxidant for 3-5 minutes; then adding it to a twin-screw extruder for melt extrusion granulation (extrusion conditions for different types of matrix resins are as follows), drying at 75-90℃ for 3-5 hours, and then injection molding using an injection molding machine to obtain the plastic material; PA extrusion: Section 1 180-200℃, Section 2 230-250℃, Section 3 240-270℃, Die head 255-270℃; PP and SAN extrusion: Section 1 160-180℃, Section 2 190-210℃, Section 3 200-230℃, Die head 215-230℃.

[0024] In the embodiments of this application, the polylactic acid (PLA) is model 4032D, purchased from NatureWorks, USA; the styrene-acrylonitrile copolymer (SAN) is model 80HF, purchased from LG Chem; the polypropylene (PP) is model K7726H, purchased from Yanshan Petrochemical; the polyamide (PA) is model YH800, purchased from Yueyang Baling Petrochemical; the dicumyl peroxide (DCP) has CAS number 80-43-3; the benzoyl peroxide (BPO) has CAS number 94-36-0; and the compatibilizer Durare 3207 is a product independently developed by our company, whose main components are glycidyl methacrylate, styrene, and methyl methacrylate. All raw materials, reagents, and solvents used in this application are commercially available.

[0025] The following describes this application in further detail with reference to preparation examples, embodiments, and performance testing. Preparation Examples 1-13

[0026] Preparation Examples 1-13 each provide an organic matting agent.

[0027] The difference in the above preparation examples lies in the amount of raw materials used and the preparation parameters in the organic matting agent, as shown in Table 1 below.

[0028] The preparation method of the organic matting agent provided in Preparation Examples 1-13 includes the following steps: weigh the resin material and peroxide crosslinking agent according to the amounts shown in Table 1, and then add them to a mixer for mixing. Adjust the mixing speed, temperature and time as shown in Table 1. After mixing, send the mixture to a high-speed pulverizer for pulverization at a speed of 30,000 r / min. After pulverization, sieve the mixture to obtain the organic matting agent. Comparative preparation examples 1-5

[0029] Comparative preparation examples 1-5 each provide an organic matting agent.

[0030] The difference between the above comparative preparation example and preparation example 4 lies in the amount of raw materials used in the organic matting agent and the preparation parameters, as shown in Table 1 below.

[0031] Table 1. Raw material dosage, parameter settings, and particle size analysis results for Preparation Examples 1-13 and Comparative Preparation Examples 1-5.

[0032] According to the results in Table 1, in Preparation Examples 1-13 of this application, resin materials and peroxide crosslinking agents were mixed in a weight ratio of (95-98):(2-5), and the mixing parameters were controlled within the following ranges: rotation speed of 20-90 r / min, temperature of 170-230℃, and time of 3-5 min. The organic matting agent obtained had a 30-mesh sieve pass rate of ≥85% and a 300-mesh sieve pass rate of ≥15%. Using the above organic matting agent to prepare plastic materials can effectively avoid the problem of uneven dispersion of the matting agent and greatly improve the matting effect of the matting agent. Examples 1-13

[0033] Examples 1-13 each provide a plastic material.

[0034] The difference in the above embodiments lies in the type and amount of each raw material, as shown in Table 2 below.

[0035] The preparation method of the plastic material provided in Examples 1-13 includes the following steps: Weigh 0.15g each of organic matting agent, matrix resin, compatibilizer and antioxidant (antioxidant 1010 + antioxidant 168 in a weight ratio of 1:1) as shown in Table 2, and mix and stir for 3-5 minutes; then add the mixture to a twin-screw extruder for melt extrusion granulation. The extruder has 4 temperature zones. The temperature is set as follows for different types of matrix resins. Finally, after drying at 80℃ for 4 hours, standard samples are prepared.

[0036] PA6 extrusion: Section 1 190℃, Section 2 240℃, Section 3 250℃, Die head 260℃; PP and SAN extrusion: Section 1 170℃, Section 2 200℃, Section 3 215℃, Die head 220℃. Comparative Examples 1-8

[0037] Comparative Examples 1-8 each provide a plastic material.

[0038] The difference between the above comparative example and Example 1 is that the types and amounts of each raw material are as shown in Table 2 below.

[0039] Table 2. Raw materials and dosage of plastic materials provided in Examples 1-13 and Comparative Examples 1-8 Performance testing

[0040] Standard specimens and injection molded plates were prepared according to the methods of Examples 1-13 and Comparative Examples 1-8, respectively. The dimensions of the specimens and injection molded plates were prepared according to the standard requirements of the corresponding test methods in Table 3. Then, various performance tests were performed, and the results are shown in Table 3 below.

[0041] Table 3 Performance test results of injection molding materials obtained in Examples 1-13 and Comparative Examples 1-8

[0042] The test results of Examples 1-3 and Comparative Examples 1-6 show that, compared with Comparative Example 6, the gloss of the plastic materials provided in Comparative Examples 1-5 decreased only slightly, while the mechanical properties decreased significantly, after adding the organic matting agent provided in Comparative Examples 1-5 to the PA matrix resin; while the gloss of the plastic materials provided in Examples 1-3 decreased significantly, while the mechanical properties decreased only slightly, after adding the organic matting agent provided in Preparation Example 5 to the PA matrix resin; further comparison revealed that, compared with Example 1, the mechanical properties of the plastic materials obtained by adding compatibilizers in Examples 2-3 were improved, and the gloss of the materials was further reduced.

[0043] The test results of Examples 4-8 and Comparative Example 7 show that, compared with Comparative Example 7, the gloss and mechanical properties of the plastic materials provided in Examples 4-8 decreased after adding the organic matting agents provided in Preparation Examples 5, 7, and 9 to the PA matrix resin. Among them, the plastic materials in Examples 5-8, with the further addition of compatibilizers, had a gloss as low as 18-45, and the mechanical properties of the plastic materials decreased less.

[0044] The test results of Examples 9-13 and Comparative Example 8 show that, compared with Comparative Example 8, the gloss and mechanical properties of the plastic materials provided in Examples 9-13 decreased after adding the organic matting agents provided in Preparation Examples 5 and 8-10 to the PA matrix resin. Among them, the plastic materials in Examples 10-13, with the further addition of compatibilizers, achieved a gloss level as low as 20-52, and the mechanical properties of the plastic materials decreased less.

[0045] The above results show that the addition of a matting agent to the matrix resin can significantly reduce the gloss of the material, but at the same time causes some loss of mechanical properties. Through experimental investigation, it was found that by further using the matting agent in combination with a compatibilizer, the mechanical properties of the resulting material can be improved, and the matting effect can be further enhanced.

[0046] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. An organic matting agent, characterized in that, It is prepared by mixing and pulverizing resin material and peroxide crosslinking agent; the weight ratio of the resin material and peroxide crosslinking agent is (95-98):(2-5); The mixing speed is 20-90 r / min, the temperature is 170-230℃, and the time is 3-5 min; the pulverizing speed is 5000-50000 r / min.

2. The organic matting agent according to claim 1, characterized in that, The resin material is selected from one or more of polypropylene, polyethylene, polylactic acid, polyamide, styrene-acrylonitrile copolymer and polymethyl methacrylate.

3. The organic matting agent according to claim 1, characterized in that, The peroxide crosslinking agent is selected from one or more of benzoyl peroxide, dicumyl peroxide, and di-tert-butyl peroxide.

4. The organic matting agent according to claim 1, characterized in that, The pulverized material needs to be sieved, and the resulting organic matting agent has a 30-mesh sieve pass rate of ≥85% and a 300-mesh sieve pass rate of ≥15%.

5. The application of the organic matting agent as described in any one of claims 1-4 in coatings and plastics.

6. A plastic material, characterized in that, It comprises the following components in parts by weight: 80-91 parts of matrix resin, 8-12 parts of organic matting agent according to any one of claims 1-4, 0-5 parts of compatibilizer and 0.1-0.2 parts of antioxidant; wherein the matrix resin is the same as or similar to the resin material in the organic matting agent.

7. The plastic material according to claim 6, characterized in that, The compatibilizer is present in parts by weight of 2-5 parts.

8. The plastic material according to claim 6, characterized in that, The compatibilizer is Durare 3207, XIRAN ® SO26080 or PP-g-MAH; the antioxidant is selected from antioxidant 1010 or antioxidant 168.

9. The plastic material according to claim 7, characterized in that, When the base resin is polyamide, the resin material in the organic matting agent is polyamide or polylactic acid; when the base resin is styrene-acrylonitrile copolymer, the resin material in the organic matting agent is styrene-acrylonitrile copolymer and / or polylactic acid; when the base resin is polypropylene, the resin material in the organic matting agent is polypropylene, styrene-acrylonitrile copolymer and / or polylactic acid.

10. The method for preparing the plastic material according to any one of claims 6-9, characterized in that, Includes the following steps: First, an organic matting agent is prepared. Then, the organic matting agent is mixed with a base resin, a compatibilizer, and an antioxidant. The mixture is then melt-extruded, granulated, dried, and injection-molded to obtain a plastic material.

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