High-gloss black pbt composition and preparation method and application thereof

Abstract

The application discloses a high-gloss black PBT composition and a preparation method and application thereof, and comprises the following components in mass fractions: 40-68 parts of PBT resin, 25-50 parts of PETG resin, 1-5 parts of black color powder, 0.3-1 part of lubricant, and 0.2-0.4 part of antioxidant; through combination of the PBT and the PETG and parameter limitation, the high-gloss black PBT composition has good glossiness and low L value.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a high-gloss black PBT composition, its preparation method, and its application. Background Technology

[0002] High-gloss black modified plastic products, such as PMMA, PC, and nylon, are widely used in automotive interior and exterior trim, such as decorative strips and grille lights. High-gloss black products are characterized by high cost and high difficulty; in addition to appearance, they also require high levels of weather resistance, scratch resistance, and chemical resistance.

[0003] Compared to traditional PC and PMMA, PBT is a crystalline polymer with a fast crystallization rate and high crystallinity, which makes it more difficult to achieve a high-gloss black effect. Therefore, there are few reports on the development and application of high-gloss black PBT products.

[0004] Therefore, it is necessary to provide a high-gloss black PBT composition to meet practical needs. Summary of the Invention

[0005] In view of this, this application provides a high-gloss black PBT composition, its preparation method and application, which has a low L value and good gloss.

[0006] To achieve the above technical objectives, this application adopts the following technical solution:

[0007] In one aspect, this application provides a high-gloss black PBT composition comprising the following components in parts by weight: 40-68 parts PBT resin, 25-50 parts PETG resin, 1-5 parts black pigment, 0.3-1 part lubricant, and 0.2-0.4 parts antioxidant.

[0008] PBT resin, including but not limited to 40, 45, 50, 55, 60, 65, and 68 parts; PETG resin, including but not limited to 25, 30, 35, 40, 45, and 50 parts; black pigment, including but not limited to 1, 2, 3, 4, and 5 parts; lubricant, including but not limited to 0.3, 0.4, 0.6, 0.8, and 1 part; antioxidant, including but not limited to 0.2, 0.3, and 0.4 parts.

[0009] PBT resin accounts for 50-60% of the mass of the high-gloss black PBT composition.

[0010] Preferably, the intrinsic viscosity of the PBT resin is 0.72-0.82 dL / g, the test standard is in accordance with GB / T14190-2017, and the solvent is phenol / 1,1,2,2-tetrachloroethane (mass ratio of 50:50).

[0011] Preferably, the intrinsic viscosity of the PETG resin is 0.76-0.78 dL / g, the test standard is in accordance with GB / T14190-2017, and the solvent is phenol / 1,1,2,2-tetrachloroethane (mass ratio of 50:50).

[0012] Preferably, the black pigment includes two or more of solvent blue 104, solvent red 179, solvent yellow 114, and solvent green 3; the black pigment is added in the form of masterbatch, wherein the carrier resin of the masterbatch is PE resin, and the black pigment accounts for 50-60% of the mass of the masterbatch.

[0013] Preferably, the black pigment is composed of solvent green 3, solvent red 179 and solvent yellow 114 in a mass ratio of (10-40):(10-40):(5-25).

[0014] Preferably, the lubricant is an ester-based lubricant.

[0015] Preferably, the antioxidants include hindered phenolic antioxidant 1010 and phosphite antioxidants such as antioxidant 168.

[0016] Secondly, this application provides a method for preparing a high-gloss black PBT composition, comprising the following steps: mixing PBT resin, PETG resin, black pigment, lubricant, and antioxidant evenly according to mass parts, followed by melt mixing and traction granulation to obtain the high-gloss black PBT composition.

[0017] Thirdly, this application provides the application of a high-gloss black PBT composition in automotive interior and exterior trim.

[0018] The beneficial effects of this application are as follows:

[0019] This application combines PETG and PBT, preferably using PBT resin with suitable viscosity. By adding an appropriate amount of PETG resin, the crystallization behavior of PBT is suppressed, thereby improving the gloss of the resin itself. Based on this, organic color powders with good compatibility with the resin are selected for combination, ultimately achieving a PBT composition with better high-gloss black effect, improving the gloss and L value of the high-gloss black PET composition. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] This application provides a high-gloss black PBT composition comprising the following components in parts by weight: 40-68 parts PBT resin, 25-50 parts PETG resin, 1-5 parts black pigment, 0.3-1 part lubricant, and 0.2-0.4 parts antioxidant.

[0022] The mechanism for achieving high-gloss black PBT is as follows: By selecting PBT resin with suitable viscosity and adding an appropriate amount of PETG resin to inhibit the crystallization behavior of PBT and improve the gloss of the resin itself, organic color powders with good compatibility with the resin are selected and combined to finally achieve a PBT composition with better high-gloss black effect.

[0023] Preferably, the PBT resin is a low-viscosity or ultra-low-viscosity resin with an intrinsic viscosity of 0.72-0.82 dL / g, tested according to GB / T 14190-2017, and the solvent is phenol / 1,1,2,2-tetrachloroethane (mass ratio of 50:50). Low-viscosity or ultra-low-viscosity PBT is preferred, as higher viscosity is detrimental to achieving a high-gloss black effect, while lower viscosity facilitates the dispersion of organic pigments and improves compatibility.

[0024] Preferably, the intrinsic viscosity of PETG resin is 0.76-0.78 dL / g, and the testing standard is in accordance with GB / T14190-2017. The solvent is phenol / 1,1,2,2-tetrachloroethane (mass ratio of 50:50). The main function of PETG is to restrict the crystallization of PBT.

[0025] Preferably, the black pigment includes two or more of solvent blue 104, solvent red 179, solvent yellow 114, and solvent green 3; the black pigment is added in the form of masterbatch, wherein the carrier resin of the masterbatch is PE resin, and the black pigment accounts for 50-60% of the mass of the masterbatch.

[0026] In some embodiments, the black pigment is composed of solvent green 3, solvent red 179 and solvent yellow 114 in a mass ratio of (10-40):(10-40):(5-25).

[0027] Preferably, the lubricant is an ester-based lubricant; suitable, but not limiting, the lubricant is selected from octadecyl ester.

[0028] Preferably, the antioxidants include hindered phenolic antioxidant 1010 and phosphite antioxidants such as antioxidant 168.

[0029] Secondly, this application provides a method for preparing a high-gloss black PBT composition, comprising the following steps: mixing PBT resin, PETG resin, black pigment, lubricant, and antioxidant evenly according to mass parts, followed by melt mixing and traction granulation to obtain the high-gloss black PBT composition.

[0030] Thirdly, this application provides the application of a high-gloss black PBT composition in automotive interior and exterior trim.

[0031] The following specific embodiments further illustrate this solution.

[0032] Raw material description

[0033] PBT Resin-1: Low-viscosity PBT GX112, Yizheng Chemical Fiber, intrinsic viscosity is 0.82 dL / g;

[0034] PBT Resin-2: Ultra-low viscosity PBT GX111, intrinsic viscosity is 0.72 dL / g, Yizheng Chemical Fiber;

[0035] PBT Resin-3: Medium viscosity PBT GX121, intrinsic viscosity is 1 dL / g, Yizheng Chemical Fiber;

[0036] PETG resin-1: KM 900, intrinsic viscosity 0.76 dL / g, Selenis Portugal;

[0037] PETG resin-2: HF 098, intrinsic viscosity 0.78 dL / g, Selenis Portugal;

[0038] PETG resin-3: KB 311, intrinsic viscosity 0.8 dL / g, Selenis Portugal;

[0039] Antioxidant: Antioxidant 1010, RIANOX 1010, Tianjin Lialong;

[0040] Lubricant: LOXIOL G 32, an ester lubricant, stearic acid ester, Emery Company;

[0041] Black pigment-1: Composed of solvent green 3, solvent red 179 and solvent yellow 114 in a mass ratio of 40:40:20; the black pigment is added in the form of masterbatch, wherein the carrier resin of the masterbatch is PE resin, and the black pigment accounts for 50% of the mass of the masterbatch.

[0042] Black Pigment-2: PE2718, 50wt% carbon black masterbatch, Cabot Corporation; the black pigment is added in masterbatch form, the carrier resin of which is PE resin, and the black pigment accounts for 50% of the mass of the masterbatch. Examples 1-4 and Comparative Examples 1-4

[0043] A high-gloss black PBT composition, the composition and performance test results of which are shown in Table 1, wherein the black pigment is added in the form of masterbatch, and its amount has been converted into the mass parts of pure pigment:

[0044] Table 1. Allocation System and Performance Test Results

[0045]

[0046]

[0047] Test Evaluation

[0048] Gloss test: According to the formula in Table 1, PBT resin, PETG resin, black pigment, lubricant and antioxidant are mixed evenly, then melt-blended and granulated to obtain high-gloss black PBT composition particles. Using a high-gloss black evaluation mold, a 100*100*2mm square plate is prepared by injection molding, and the gloss is tested using a gloss meter.

[0049] L-value test: In order to evaluate the blackness of the composition, the Lab value of the square plate is tested using a color difference tester, and the L value is recorded by comparison.

[0050] The solution proposed in this application can achieve a gloss level (20℃) of 78 or higher and a blackness L value of 15 or lower.

[0051] The experimental results show that, compared with Comparative Example 1, the gloss and blackness of Examples 1 and 2 are significantly improved. PBT in the non-limited viscosity range is not conducive to the dispersion of the pigment system, resulting in low blackness and gloss.

[0052] Compared with Example 3 and Comparative Example 2, Example 1 has higher gloss and blackness, but the higher viscosity of PETG is unfavorable.

[0053] Compared with Comparative Example 3, the poor compatibility of non-specific pigments leads to a significant reduction in gloss and blackness, which may be due to poor dispersibility.

[0054] Compared with Comparative Example 4, when the ratio of PBT to PETG is outside the range of this invention, the gloss and blackness performance are poor.

[0055] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-gloss black PBT composition, characterized in that, It is composed of the following components in parts by weight: 40-68 parts PBT resin, 25-50 parts PETG resin, 1-5 parts black pigment, 0.3-1 part lubricant, and 0.2-0.4 parts antioxidant, wherein the black pigment is an organic pigment; The intrinsic viscosity of the PBT resin is 0.72-0.82 dL / g, and the test standard is in accordance with GB / T 14190-2017; The intrinsic viscosity of the PETG resin is 0.76-0.78 dL / g, and the test standard is in accordance with GB / T 14190-2017; The black pigment is composed of solvent green 3, solvent red 179 and solvent yellow 114 in a mass ratio of (10-40):(10-40):(5-25); The black pigment is added in the form of a masterbatch, the carrier resin of which is PE resin, and the black pigment accounts for 50-60% of the mass of the masterbatch.

2. The high-gloss black PBT composition according to claim 1, characterized in that, The lubricant is an ester-based lubricant.

3. The high-gloss black PBT composition according to claim 1, characterized in that, The antioxidants include at least one of hindered phenolic antioxidants and phosphite antioxidants.

4. A method for preparing a high-gloss black PBT composition according to any one of claims 1-3, characterized in that, Includes the following steps: PBT resin, PETG resin, black pigment, lubricant, and antioxidant are mixed evenly according to the mass ratio, and then melt-blended and granulated to obtain a high-gloss black PBT composition.

5. The application of a high-gloss black PBT composition as described in any one of claims 1-3 in automotive interior and exterior trim.

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