CN115710397B - Constant-temperature polypropylene material and preparation method and application thereof - Google Patents

Abstract

The application relates to a constant temperature polypropylene material, a preparation method and application thereof, and the components comprise: polypropylene resin, polyolefin elastomer, talcum powder, high-density polyethylene, nano silicon dioxide, palmitic acid, aluminum-titanium composite coupling agent and antioxidant. The polypropylene material can meet the mechanical property of the automotive interior part, can obviously reduce the temperature rise of the material under long-time illumination, and is a novel environment-friendly material capable of saving energy and reducing emission.

Description

Constant-temperature polypropylene material and preparation method and application thereof

Technical Field

The application belongs to the field of general plastics, and particularly relates to a constant-temperature polypropylene material, and a preparation method and application thereof.

Background

The polypropylene material used in automotive interiors today is typically a modified polypropylene, which is used in the automotive cabin after being made into parts. There is a large amount of area exposed to sunlight and the surface temperature of the part increases over time, especially during summer. Therefore, the load of the air conditioner is increased, the energy consumption is increased, and particularly, the endurance mileage of the electric automobile is obviously reduced. At present, no patent and paper related to constant temperature are found in the application field of the existing polypropylene materials. Therefore, it is a significant matter for materials for automobiles, especially for new energy automobiles, to develop a material that can maintain a constant temperature or has an insignificant temperature rise under light.

Disclosure of Invention

Aiming at the defects of the prior art, the application aims to provide a constant-temperature polypropylene material and a preparation method and application thereof.

The application discloses a polypropylene material, which comprises the following components in parts by weight:

wherein the number average molecular weight of the high-density polyethylene is more than or equal to 15 ten thousand, and the molecular weight adopts a Gel Permeation Chromatography (GPC) method. The molecular weight and molecular weight distribution of the samples were determined using PL-GPC 220-type high temperature gel permeation chromatography (Polymer Laboratories ltd., USA), solvent was 1,2, 4-trichlorobenzene, solution concentration was 0.2% (w/v), flow rate was 1mL/min, dissolution temperature was 150 ℃, and the instrument was calibrated using polystyrene standard samples.

Preferably, the polyolefin elastomer is one or more of ethylene-octene copolymer, ethylene-butene copolymer and ethylene-hexene copolymer.

Preferably, the high density polyethylene has a number average molecular weight of 16 to 20 ten thousand.

Because the molecular chain of the polyethylene with relatively low molecular weight is shorter, the polyethylene with relatively high molecular chain is easy to generate chain segment movement and unwrapping under the same illumination condition, and the absorbed energy is relatively less. If the molecular weight is too high, entanglement of molecular chains is serious, movement of chain segments is limited, more energy is difficult to absorb under illumination, and compatibility of the polypropylene is reduced.

Preferably, the antioxidant is a mixture of hindered phenolic antioxidants and phosphite antioxidants. Wherein the weight ratio of the hindered phenol antioxidant to the phosphite antioxidant is 1:1.

Preferably, the hindered phenol antioxidant is one or more of 1,3, 5-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) -1,3, 5-triazine-2, 4,6 (1H, 3H, 5H) -trione, 1,3, 5-trimethyl-2, 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene; the phosphite antioxidant is one or more of tri (2, 4-di-tert-butylphenyl) phosphite and bis (2, 4-di-tert-butylphenyl) propionic acid) pentaerythritol diphosphite.

Preferably, the particle size of the nano silicon dioxide is 30-80nm.

The particle size is too small, the dispersion is poor, and a better three-position network structure is difficult to achieve in a system. The particle size is too large, the comprehensive specific surface area is too small, the infrared ray reflection and palmitic acid absorption capability is weakened, and the phase change effect is affected.

Preferably, the components comprise, by weight:

the preparation method of the polypropylene material provided by the application comprises the following steps:

weighing the components according to parts by weight, firstly putting nano silicon dioxide and an aluminum-titanium composite coupling agent into a high-speed mixer according to a proportion, then mixing for 3-6 minutes at a speed of 500-600prm, then putting palmitic acid into the high-speed mixer according to a proportion, mixing for 2-5 minutes at the same speed, finally putting the rest materials into the high-speed mixer, mixing for 3-5 minutes, granulating by a double-screw extruder, wherein the temperature of a conveying section of the double-screw extruder is 160-180 ℃, the temperature of a melting mixing section is 190-220 ℃, the temperature of an exhaust homogenizing section is 190-230 ℃, the screw speed is 400-600prm, and obtaining the polypropylene material after extrusion granulation.

The polypropylene material is applied to automobile interior parts, such as door panels, upright posts, guard plates and the like.

The nano silicon dioxide can absorb light energy under sunlight irradiation, can reflect ultraviolet rays, and can obviously reduce the temperature rise of materials when being used in polypropylene. The stability of the palmitic acid in the system is improved, the heat conduction efficiency is improved, the phase transformation capability is better promoted, and the temperature rise is reduced. Secondly, the nano-scale microstructure is dispersed among HDPE layers containing larger molecular chains, and the screened HDPE has better constant temperature performance compared with polypropylene. In conclusion, with the aid of the aluminum-titanium composite coupling agent, palmitic acid is adsorbed in the micropores of the nano silicon dioxide to form stable phase change particles, the stable phase change particles are dispersed among macromolecular layers of the HDPE in a nano-level and micro-level hierarchical structure, heat conduction efficiency is improved, good synergistic effect is achieved integrally, and a good constant temperature effect can be achieved.

Advantageous effects

The constant-temperature polypropylene material can remarkably reduce the temperature rise of the material under long-time illumination while meeting the mechanical property of automobile interior parts, and is a novel environment-friendly material capable of saving energy and reducing emission.

Detailed Description

The application will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the teachings of the present application, and such equivalents are intended to fall within the scope of the application as defined in the appended claims.

1. The raw material sources are as follows:

polypropylene-1: copolymerized polypropylene BX3900, korea SK;

polypropylene-2: homo-polypropylene HP500N, zhonghai Shell;

polyolefin elastomer-1: ethylene-octene copolymer POE 8137, dow chemical;

polyolefin elastomer-2: ethylene-butene copolymer POE 7467 dow chemical;

talc powder: TYT-777A North sea group;

high density polyethylene-1: HDPE 5000S with a number average molecular weight of 16.5 ten thousand, lanzhou petrochemical;

high density polyethylene-2: HDPE 5502, number average molecular weight 19.6 ten thousand, shanghai Jin Fei;

high density polyethylene-3: HDPE 5421B, number average molecular weight 23 ten thousand, middle sea shell;

high density polyethylene-4: HDPE DMDA8008, number average molecular weight 12.8 ten thousand, lanzhou petrochemical;

nano silicon dioxide-1: CW-SiO2-003, the average grain diameter is 30nm, shanghai super-Wei nanotechnology;

nano silica-2: CW-SiO2-008, average grain size 80nm, shanghai super-Wei nano technology;

nano silicon dioxide-3: CW-SiO2-002 with average grain size of 20nm and Shanghai super-Wei nano technology;

nano silicon dioxide-4: CW-SiO2-010, average grain diameter 100nm, shanghai super-Wei nano technology;

aluminum-titanium composite coupling agent: boiling point of HW-133 Hangzhou aluminum-titanium composite coupling agent;

silane coupling agent KH550 Nanjing dawn;

palmitic acid: LR-012 Shanghai blue moisturizing industry;

lauric acid: SY-LA-0002 Shanghai chain chemical industry;

an antioxidant: antioxidant 1790 and antioxidant 168 are mixed in a weight ratio of 1:1.

The antioxidants in the parallel examples and comparative examples are the same commercially available products.

2. Preparation methods of examples and comparative examples

Firstly, putting nano silicon dioxide and an aluminum-titanium composite coupling agent into a high-speed mixer according to a proportion, then mixing for 3-6 minutes at a speed of 500-600prm, then putting palmitic acid into the high-speed mixer according to a proportion, mixing for 2-5 minutes at the same speed, finally putting the rest materials into the high-speed mixer, mixing for 3-5 minutes, and granulating by a double-screw extruder. The temperature of the double-screw extrusion stage conveying section is 160-180 ℃, the temperature of the melting mixing section is 190-220 ℃, the temperature of the exhaust homogenizing section is 190-230 ℃, the screw rotating speed is 400-600prm, and the polypropylene material can be obtained after extrusion granulation.

3. Test criteria and methods

The granulated product was sampled and evaluated for thermostability according to the following method.

Respectively preparing samples with sample sizes of 100 multiplied by 4mm by using an injection molding machine at the temperature of 210+/-5 ℃;

the constant temperature evaluation method comprises the following steps: and (3) placing the prepared templates in a constant temperature and humidity laboratory for adjustment for 24H, then placing the templates under sunlight for continuous irradiation for 120min, then testing the surface temperature by using an infrared thermometer, recording the temperature difference between the templates before irradiation and the temperature difference between the templates after irradiation, and taking 3 templates for each sample and taking an average value of the temperature. The smaller the temperature difference, the better the constant temperature performance.

The tensile strength was determined according to ISO 527-2 2012, the sample size was 150X 10X 4mm, and the tensile speed was 50mm/min;

IZOD notched impact strength was measured according to ISO180-2000, temperature 23.+ -. 2 ℃ and humidity 50.+ -. 5%.

Table 1 the composition ratios (parts by weight) of the examples

Table 2 the composition ratio (parts by weight) of the comparative examples

Component (A)	Comparative example 1	Comparative example 2	Comparative example 3	Comparative example 4	Comparative example 5	Comparative example 6
							Polypropylene-1	64.1	64.1	64.1	64.1	64.1	64.1
Polyolefin elastomer-1	5	5	5	5	5	5
							Talc powder	20	20	20	20	20	20
High density polyethylene-1		5	5	5	5	5
							High density polyethylene-4	5
Nano silicon dioxide-1	2	2		2	2	2
							Palmitic acid	1.5		1.5	1.5	1.5
Lauric acid						1.5
							Aluminum-titanium composite coupling agent	0.4	0.4	0.4			0.4
Silane coupling agent KH550					0.4
							Antioxidant	0.4	0.4	0.4	0.4	0.4	0.4

Table 3 shows the proportions of the comparative examples (parts by weight)

Table 4 performance effects of the examples

Table 5 performance effects of the examples

Test item	Unit (B)	Example 11	Example 12	Example 13
					Tensile Strength	MPa	24.4	24.8	24.3
IZOD notched impact Strength	KJ/m 2	14.7	14.3	14.1
					Temperature before illumination	℃	23.0	23.2	22.9
Post-illumination temperature	℃	28.7	31.1	31.3
					Temperature difference	℃	5.7	7.9	8.4

Table 6 performance effect data for comparative example

Table 7 performance effect data for comparative example

Analytical description of examples and comparative examples

As can be seen from the above example 1 and comparative examples 2, 3 and 4, the temperature rise of the materials added with the nano silicon dioxide, palmitic acid and aluminum titanium composite coupling agent is lower than that of the materials added with the nano silicon dioxide, palmitic acid and aluminum titanium composite coupling agent, which shows that the nano silicon dioxide, palmitic acid and aluminum titanium composite coupling agent have a synergistic effect. And the same effect cannot be achieved in comparison with, for example, the replacement of palmitic acid with lauric acid or the replacement of the aluminum-titanium composite coupling agent with a silane coupling agent. And in the preferred ranges described in this patent, the temperature rise effect is lower. The use of HDPE of molecular weight 16 ten thousand or less in comparative example 1, which has a higher temperature rise than that of example 1, shows that the introduction of low molecular weight HDPE has a certain effect on the temperature rise. The constant temperature material can improve the constant temperature effect of the material on the premise of ensuring the performance of the existing material, and reduce the energy consumption due to the improvement of temperature rise. If the energy-saving and emission-reducing automobile interior decoration is popularized and used in automobile interiors, particularly under the condition of summer, the energy consumption of the automobile, particularly the electric automobile, can be effectively reduced, and the effects of energy conservation and emission reduction are achieved.

Claims (8)

1. The constant temperature polypropylene material is characterized by comprising the following components in parts by weight:

wherein the number average molecular weight of the high-density polyethylene is more than or equal to 15 ten thousand.

2. The polypropylene material according to claim 1, wherein the polyolefin elastomer is one or more of ethylene-octene copolymer, ethylene-butene copolymer, ethylene-hexene copolymer.

3. The polypropylene material according to claim 1, wherein the high density polyethylene has a number average molecular weight of 16 to 20 ten thousand.

4. The polypropylene material according to claim 1, wherein the antioxidant is a mixture of hindered type antioxidants and phosphite type antioxidants.

5. The polypropylene material according to claim 1, wherein the nanosilica has a particle size of from 30nm to 80nm.

6. The polypropylene material according to claim 1, wherein the components comprise, in parts by weight:

7. a method of preparing the polypropylene material of claim 1, comprising:

weighing the components according to parts by weight, firstly putting nano silicon dioxide and an aluminum-titanium composite coupling agent into a high-speed mixer according to a proportion, then mixing for 3-6 minutes at a speed of 500-600prm, then putting palmitic acid into the high-speed mixer according to a proportion, mixing for 2-5 minutes at the same speed, finally putting the rest materials into the high-speed mixer, mixing for 3-5 minutes, granulating by a double-screw extruder, wherein the temperature of a conveying section of the double-screw extruder is 160-180 ℃, the temperature of a melting mixing section is 190-220 ℃, the temperature of an exhaust homogenizing section is 190-230 ℃, the screw speed is 400-600prm, and obtaining the polypropylene material after extrusion granulation.

8. Use of the polypropylene material of claim 1 in automotive interior parts.