PA / PET alloy, its preparation method and application

Abstract

The application discloses a PA / PET alloy, which comprises the following components in parts by weight: 40-65 parts of PA MXD6, 10-20 parts of PET, 40-55 parts of glass fiber, 0.1-0.5 parts of a metal salt of lignocenic acid, and 0.05-0.25 parts of a metal salt of iodine. The application is formed by compounding PA MXD6 and PET with specific contents to form an alloy, and has the basic characteristic of high-temperature creep resistance. Further, the metal salt of lignocenic acid and the metal salt of iodine with specific amounts are compounded, so that the high-temperature creep resistance can be further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high polymer materials, in particular to a PA / PET alloy and a preparation method and application thereof. BACKGROUND

[0002] In recent years, "scientific energy saving and emission reduction, and taking a low-cost development road" has become a long-term development trend of various industries, and "plastic replacing wood" and "plastic replacing steel" have become one of the important ways of energy saving and emission reduction, and are urgently needed in the fields of automobiles, household appliances, industrial equipment, and mechanical equipment.

[0003] Glass fiber reinforced nylon material has high specific strength and is easy to form, and is the first choice for replacing steel. However, ordinary nylon material also has problems of performance degradation at high temperature and poor high-temperature creep resistance, which restricts its use in some structural parts requiring high-temperature contact. SUMMARY

[0004] The present application aims to provide a PA / PET alloy with good high-temperature creep resistance, and a preparation method and application thereof.

[0005] The present application is achieved by the following technical solutions:

[0006] A PA / PET alloy, by weight, comprises the following components:

[0007] PA MXD6 40-65 parts;

[0008] PET 10-20 parts;

[0009] Glass fiber 40-55 parts;

[0010] Lignite acid metal salt 0.1-0.5 parts;

[0011] Iodized metal salt 0.05-0.25 parts.

[0012] Preferably, by weight, comprises the following components:

[0013] PA MXD6 45-60 parts;

[0014] PET 13-17 parts;

[0015] Glass fiber 40-55 parts;

[0016] Lignite acid metal salt 0.2-0.4 parts;

[0017] Iodized metal salt 0.1-0.2 parts.

[0018] The lignite acid metal salt is selected from at least one of calcium lignosulfonate, sodium lignosulfonate, aluminum lignosulfonate, and magnesium lignosulfonate.

[0019] The iodized metal salt is selected from at least one of cuprous iodide, potassium iodide, zinc iodide, magnesium iodide, and aluminum iodide; preferably cuprous iodide.

[0020] Preferably, the length ratio of the long axis and the short axis of the cross section of the glass fiber is between 2:1 and 5:1, more preferably between 3.5:1 and 4.5:1.

[0021] The relative viscosity of PA MXD6 and PET in the technical solution of the application is not particularly limited, according to the experiment, the relative viscosity of the PA MXD6 is 2.1-2.6, and the relative viscosity of the PET is 0.5-1.0, which can achieve the purpose of the application.

[0022] The test method of the relative viscosity of PA MXD6 and PET is that the outflow velocity relative to the standard 98% sulfuric acid solution is calculated.

[0023] According to actual needs, whether to add 0-1 parts of an antioxidant can be selected.

[0024] The preparation method of the PA / PET alloy of the application is that, according to the proportion, the components except the glass fiber are uniformly mixed, and then extruded and granulated through a double-screw extruder, the glass fiber is fed on the side, the screw temperature range is 180-350 DEG C, and the screw rotation speed range is 200-700 rpm, so that the PA / PET alloy is obtained.

[0025] The high-temperature creep resistance ΔL of the PA / PET alloy of the application is less than 1.5, which is used for preparing structural parts that need high-temperature contact, such as the hot plate support of a hair straightener, the heating ring support of an electric rice cooker, and a motor support.

[0026] The application has the following beneficial effects:

[0027] The PAMXD6 resin is a polycondensate of m-phenylenediamine and adipic acid, the benzene ring structure has the characteristics of being more stable at high temperature than ordinary aliphatic nylon, which helps to improve the high-temperature creep resistance, and the specific content of PET resin (polyethylene terephthalate) can make up for the structural defects of the space steric hindrance of each other, so that the molecular chain segments are more tightly stacked, and the high-temperature creep resistance is improved.

[0028] The complex use of metal iodide and lignite acid metal salt forms a complex between the resin and the glass fiber, stabilizes the chain segment slip at high temperature, and further improves the high-temperature creep resistance. Embodiment

[0029] The application will be described in detail below with specific examples. The following examples will help those skilled in the art to further understand the application, but do not limit the application in any form. It should be noted that for those skilled in the art, without departing from the concept of the application, a number of modifications and improvements can be made. These are within the scope of the present application.

[0030] The experimental raw materials used in the application are as follows:

[0031] PA MXD6-1: relative viscosity 2.1, ZYMX 5001, Sinochem Technology Co., Ltd.;

[0032] PA MXD6-2: relative viscosity 2.6, M30, Yinggu Chemical Industry;

[0033] PA MXD6-3: relative viscosity 3.5, MXD6 6121, Mitsubishi Gas Chemical;

[0034] PET-1: relative viscosity 0.5, PET SB500, SINOPEC Yizheng Chemical Fibre Co., Ltd.;

[0035] PET-2: relative viscosity 1.0, PET BG80, SINOPEC Yizheng Chemical Fibre Co., Ltd.;

[0036] PET-3: relative viscosity 1.2, SH22, SK Corporation;

[0037] PA66: relative viscosity 2.7, PA66 EP-158, Zhejiang Huafeng Group;

[0038] PBT: relative viscosity 0.8, PBT 1084, Nantong Xingchen Group;

[0039] Calcium lignosulfonate: Licomont CaV102, Clariant Corporation;

[0040] Sodium lignosulfonate: Licomont NAV101, Clariant Corporation;

[0041] Cuprous iodide, potassium iodide, zinc iodide are commercially available.

[0042] Glass fiber A: flat ratio 4:1, ECS301HP-3-M4, Chongqing International Composite Materials Co., Ltd.;

[0043] Glass fiber B: flat ratio 3:1, ECS301HP-3-M3, Chongqing International Composite Materials Co., Ltd.;

[0044] Glass fiber C: flat ratio 1:1, ECS301HP-3-H, Chongqing International Composite Materials Co., Ltd.;

[0045] Preparation method of the PA / PET alloy: mix the components except the glass fiber uniformly, extrude and granulate through a double screw extruder, side feed the glass fiber, the temperature range of each section of the screw cylinder is 180-280-270-260-250-250-250-250-250-260℃, the screw rotation speed range is 200-700rpm, and the PA / PET alloy is obtained.

[0046] Test methods:

[0047] (1) High temperature creep resistance: each sample is injection molded into a sample bar with a thickness of 0.8mm, a width of 10mm and a length of 125mm, one end is fixed to the crossbeam 20mm away from the end point, the other end is clamped with a 200g weight 20mm away from the end point, and then they are uniformly placed in an 80℃ oven, and the deformation of the sample bar is tested after 2016 hours, L2 (after high temperature treatment) -L1 (before high temperature treatment) =△L. The smaller the deformation, the better the high temperature creep resistance.

[0048] Table 1: Component content (parts by weight) and test results of PA / PET alloy of examples 1-7

[0049] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 PA MXD6-1 50 40 45 45 60 PA MXD6-2 50 PA MXD6-3 50 PET-1 15 20 13 17 17 PET-2 15 PET-3 15 Calcium montanate 0.2 0.2 0.2 0.1 0.2 0.2 0.4 Cuprous iodide 0.15 0.15 0.15 0.05 0.1 0.1 0.2 Glass fiber A 40 55 45 40 40 40 40 Creep, mm 1.1 0.8 1.0 1.3 1.2 1.0 1.2

[0050] As can be seen from examples 1 / 4-8, the creep value is lower under the preferred component formula, indicating better high temperature creep resistance.

[0051] Table 2: Component content (parts by weight) and test results of PA / PET alloy of examples 8-13

[0052] Example 8 Example 9 Example 10 Example 11 Example 12 Example 13 PA MXD6-1 65 50 50 50 50 50 PET-1 10 15 15 15 15 15 Calcium montanate 0.5 0.2 0.2 0.2 0.2 Sodium montanate 0.2 Cuprous iodide 0.25 0.15 0.15 0.15 Potassium iodide 0.15 Zinc iodide 0.15 Glass fiber A 40 40 40 40 Glass fiber B 40 Glass fiber C 40 Creep, mm 1.3 1.3 1.3 1.2 1.4 1.1

[0053] As can be seen from examples 1 / 9 / 10, the iodized metal salt is preferably cuprous iodide.

[0054] As can be seen from examples 1 / 11 / 12, the length ratio of the long axis and the short axis of the cross section of the glass fiber is preferably between 2:1 and 5:1, and more preferably between 3.5:1 and 4.5:1, and the high temperature creep resistance is better.

[0055] Table 3: Component content (parts by weight) and test results of PA / PET alloy of comparative examples 1-7

[0056] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 PA MXD6-1 35 70 50 50 50 50 PA 66 50 PET-1 20 10 15 15 15 15 PBT 15 Calcium montanate 0.2 0.2 0.2 0.2 0 0.05 0.6 Cuprous iodide 0.15 0.15 0.15 0.15 0.15 0.15 0.15 Glass fiber A 40 40 40 40 40 40 40 Creep, mm 1.6 1.8 2.2 1.7 2.2 2.0 2.1

[0057] As can be seen from comparative examples 1-2, when the ratio of PA MXD6 to PET is not within the scope of the application, the high temperature creep resistance is poor.

[0058] As can be seen from comparative example 3, PA66 cannot have the synergistic effect with PET. As can be seen from comparative example 3, PA66 cannot have the synergistic effect with PET.

[0059] From Comparative Example 4, it can be seen that PBT cannot replace PET resin.

[0060] From Comparative Examples 5 / 6, it can be seen that if lignite acid calcium is not contained or the content is too low, the improvement of high-temperature creep resistance is not obvious.

[0061] From Comparative Example 7, it can be seen that if the content of lignite acid calcium is too high, it will also cause cracking of high-temperature creep resistance.

[0062] Table 4: Content of each component (parts by weight) and test results of Comparative Examples 8-11 PA / PET alloy

[0063] Comparative Example 8 Comparative Example 9 Comparative Example 10 Comparative Example 11 PA MXD6-1 50 50 50 50 PET-1 15 15 15 15 Calcium montanate 0.2 0.2 0.2 0.2 Cuprous iodide 0 0.01 0.4 0.15 Glass fiber A 40 40 40 20 Creep, mm Comparative Example 8 Comparative Example 9 Comparative Example 10 Comparative Example 11 PA MXD6-1 PET-1 Calcium montanate Cuprous iodide Glass fiber A Creep, mm 1.8 1.7 1.6 1.9

[0064] From Comparative Examples 8-9, it can be seen that if cuprous iodide is not contained or the content is too low, the improvement of high-temperature creep resistance is not obvious.

[0065] From Comparative Example 10, it can be seen that if the content of cuprous iodide is too high, it will also cause cracking of high-temperature creep resistance.

[0066] From Comparative Example 11, it can be seen that the application needs to add a large amount of glass fiber to form a complex between the resin and the glass fiber to improve the high-temperature creep resistance, so when the content of glass fiber is low, the application cannot achieve the purpose.

Claims

1. A PA / PET alloy, characterized in that, By weight parts, comprising the following components: PA MXD6 40-65 parts; PET 10-20 parts; Glass fiber 40-55 parts; Lignite acid metal salt 0.1-0.5 parts; Iodized metal salt 0.05-0.25 parts.

2. The PA / PET alloy according to claim 1, characterized in that, By weight parts, comprising the following components: PA MXD6 45-60 parts; PET 13-17 parts; Glass fiber 40-55 parts; Lignite acid metal salt 0.2-0.4 parts; Iodized metal salt 0.1-0.2 parts.

3. The PA / PET alloy of claim 1, wherein The lignite acid metal salt is selected from at least one of calcium lignosulfonate, sodium lignosulfonate, aluminum lignosulfonate, magnesium lignosulfonate.

4. The PA / PET alloy of claim 1, wherein The iodized metal salt is selected from at least one of cuprous iodide, potassium iodide, zinc iodide, magnesium iodide, aluminum iodide.

5. The PA / PET alloy of claim 4, wherein The iodized metal salt is cuprous iodide.

6. The PA / PET alloy of claim 1, wherein, The length ratio of the long axis and the short axis of the cross section of the glass fiber is between 2:1 and 5:

1.

7. The PA / PET alloy of claim 1, wherein The relative viscosity of the PA MXD6 ranges from 2.1 to 2.

6.

8. The PA / PET alloy of claim 1, wherein, The relative viscosity of the PET ranges from 0.5 to 1.

0.

9. The PA / PET alloy of claim 1, wherein, By weight parts, further comprising 0-1 parts of antioxidant.

10. Process for the production of the PA / PET alloy according to any one of claims 1 to 9, characterized in that, According to the proportion, mix each component except the glass fiber uniformly, extrude and granulate through a double screw extruder, feed the glass fiber, the screw temperature range is 180-350℃, the screw rotation speed range is 200-700rpm, to obtain the PA / PET alloy.

11. Use of the PA / PET alloy according to any one of claims 1 to 9, characterized in that For preparing structural parts requiring high temperature contact. For preparing structural parts requiring high temperature contact.