阅读说明：本技术 高光阻燃聚酰胺材料及其制备方法 (High-gloss flame-retardant polyamide material and preparation method thereof ) 是由 陈琪 杨凤凯 张宝辉 廖云飞 于 2021-08-06 设计创作，主要内容包括：本发明公开了一种高光阻燃聚酰胺材料及其制备方法,高光阻燃聚酰胺材料按照质量份数包括50份～80份的聚酰胺基料、3份～20份的非晶聚酰胺、8份～15份的阻燃剂以及4份～15.5份的助剂。这种高光阻燃聚酰胺材料通过添加非晶聚酰胺,非晶聚酰胺可以包覆于高光阻燃聚酰胺材料表面,由于非晶聚酰胺的表面光泽度比聚酰胺基料的光泽度更高,从而使得添加非晶聚酰胺后得到的高光阻燃聚酰胺材料的光泽度得到提高。与传统的高光阻燃聚酰胺材料相比,这种添加了非晶聚酰胺的高光阻燃聚酰胺材料的表面光泽度较高。(The invention discloses a high-gloss flame-retardant polyamide material and a preparation method thereof, wherein the high-gloss flame-retardant polyamide material comprises, by mass, 50-80 parts of polyamide base material, 3-20 parts of amorphous polyamide, 8-15 parts of flame retardant and 4-15.5 parts of auxiliary agent. According to the high-gloss flame-retardant polyamide material, the amorphous polyamide is added, the surface of the high-gloss flame-retardant polyamide material can be coated with the amorphous polyamide, and the glossiness of the surface of the amorphous polyamide is higher than that of the polyamide base material, so that the glossiness of the high-gloss flame-retardant polyamide material obtained after the amorphous polyamide is added is improved. Compared with the traditional high-gloss flame-retardant polyamide material, the high-gloss flame-retardant polyamide material added with the amorphous polyamide has higher surface glossiness.)

1. The high-gloss flame-retardant polyamide material is characterized by comprising, by mass, 50-80 parts of a polyamide base material, 3-20 parts of amorphous polyamide, 8-15 parts of a flame retardant and 4-15.5 parts of an auxiliary agent.

2. The high gloss flame retardant polyamide material according to claim 1, characterized in that 4-15.5 parts of the aid are 0.3-1.5 parts of dispersing aid, 3-10 parts of toughening agent, 0.2-1 part of antioxidant and 0.5-3 parts of white mineral oil.

3. The high gloss flame retardant polyamide material according to claim 2, wherein the dispersing aid is selected from at least one of ethylene bis stearamide, stearic acid, erucamide and silicone;

the toughening agent is selected from at least one of POE grafted maleic anhydride, ethylene propylene diene monomer, ethylene vinyl acetate copolymer and styrene-butadiene-styrene block copolymer;

the antioxidant is prepared from the following components in percentage by mass of 1: 1 or 2: 3 hindered phenol main antioxidant and phosphite ester synergistic antioxidant;

the white mineral oil is selected from at least one of white mineral oil No. 5, white mineral oil No. 7, white mineral oil No. 10 and white mineral oil No. 15.

4. The high gloss flame retardant polyamide material according to claim 2, characterized in that the flame retardant is a halogen free flame retardant;

the halogen-free flame retardant is melamine cyanurate with the average particle size of less than 10 mu m.

5. The high gloss flame retardant polyamide material according to claim 4, wherein the polyamide base material is polyamide with a viscosity of 1.8-2.8, and the melting temperature of the amorphous polyamide is lower than 200 ℃.

6. The high gloss flame retardant polyamide material of claim 5, characterized in that the high gloss flame retardant polyamide material comprises 76 parts of the polyamide base stock, 5 parts of the amorphous polyamide, 12 parts of the flame retardant, 0.5 parts of the dispersing aid, 5 parts of the toughening agent, 0.5 parts of the antioxidant and 1 part of the white mineral oil.

7. The high gloss flame retardant polyamide material according to any one of claims 1 to 6, wherein the total parts of the components in the high gloss flame retardant polyamide material is 100 parts.

8. A preparation method of the high-gloss flame-retardant polyamide material as claimed in any one of claims 2 to 7, characterized by comprising the following steps:

uniformly mixing 50-80 parts of polyamide base material, 3-20 parts of amorphous polyamide, 3-10 parts of toughening agent and 0.5-3 parts of white mineral oil according to the mass parts to obtain a premix;

uniformly mixing 8-15 parts of flame retardant, 0.3-1.5 parts of dispersing aid, 0.2-1 part of antioxidant and the premix according to the mass parts to obtain a mixture; and

and melting and granulating the mixture to obtain the highlight flame-retardant polyamide material.

9. The method for preparing the high gloss flame retardant polyamide material according to claim 8, further comprising drying 50-80 parts of the polyamide base material and 3-20 parts of the amorphous polyamide at 100-120 ℃ for 2-3 hours before uniformly mixing 50-80 parts of the polyamide base material, 3-20 parts of the amorphous polyamide, 3-10 parts of the toughening agent and 0.5-3 parts of white mineral oil to obtain a premix.

10. The preparation method of the high gloss flame retardant polyamide material according to claim 8, wherein the melting granulation of the mixture is performed by: adopting a double-screw extruder to perform melt extrusion on the mixture, cooling, air-drying and granulating, wherein the process parameters of the double-screw extruder are set as follows: the temperature of the first section is 210-220 ℃, the temperature of the second section is 225-235 ℃, the temperature of the third section is 235-245 ℃, the temperature of the fourth section is 235-245 ℃, the temperature of the fifth section is 235-245 ℃, the temperature of the sixth section is 225-235 ℃, the temperature of the seventh section is 225-235 ℃, the temperature of the eighth section is 240-250 ℃, the temperature of the ninth section is 220-230 ℃, the temperature of the machine head is 240-250 ℃, the rotating speed of the main machine is 350-400rpm, and the feeding speed is 25-30 rpm.

Technical Field

The invention relates to the technical field of new high-molecular materials, in particular to a high-gloss flame-retardant polyamide material and a preparation method thereof.

Background

The Polyamide is commonly known as Nylon (Nylon), and is called Polyamide (PA for short), the density of the Polyamide is 1.15g/cm, the Polyamide is a general name of thermoplastic resin containing a repeated amide group [ NHCO ] -, the PA has various varieties, such as PA6, PA66, PALl, PA12, PA46, PA610, PA612, PA1010 and the like.

PA6 is a common engineering plastic with high heat resistance temperature, high crystallinity, high mechanical strength and rigidity, good dimensional stability, excellent oil resistance and wear resistance, relatively low price and very high cost performance, so the PA6 is popular at home and abroad. However, it also has its own drawbacks, such as that its flame retardant properties can only reach HB level, and the absorbency is the highest among plastics.

In order to improve the flame retardancy of PA6, it is generally chosen to add flame retardants thereto. The common fire retardant is mainly divided into two blocks of halogen and halogen-free fire retardant. The halogen flame retardant is forbidden to be used in many occasions due to certain damage to the environment and human body, and the common halogen-free flame retardant comprises MCA, APP, MPP, red phosphorus, Mg (OH)₂、Al(OH)₃And the like, but the traditional halogen-free flame retardant in the blending modification of the polyamide can cause the obtained polyamide material to have rough surface and poor surface gloss, thus influencing the use.

Disclosure of Invention

Based on this, there is a need to provide a high gloss flame retardant polyamide material with high surface gloss.

The high-gloss flame-retardant polyamide material comprises, by mass, 50-80 parts of a polyamide base material, 3-20 parts of amorphous polyamide, 8-15 parts of a flame retardant and 4-15.5 parts of an auxiliary agent.

The preparation method of the high-gloss flame-retardant polyamide material comprises the following steps:

uniformly mixing 50-80 parts of polyamide base material, 3-20 parts of amorphous polyamide, 3-10 parts of toughening agent and 0.5-3 parts of white mineral oil according to the mass parts to obtain a premix;

uniformly mixing 8-15 parts of flame retardant, 0.3-1.5 parts of dispersing aid, 0.2-1 part of antioxidant and the premix according to the mass parts to obtain a mixture; and

and melting and granulating the mixture to obtain the highlight flame-retardant polyamide material.

According to the high-gloss flame-retardant polyamide material, the amorphous polyamide is added, the surface of the high-gloss flame-retardant polyamide material can be coated with the amorphous polyamide, and the glossiness of the surface of the amorphous polyamide is higher than that of the polyamide base material, so that the glossiness of the high-gloss flame-retardant polyamide material obtained after the amorphous polyamide is added is improved. Compared with the traditional high-gloss flame-retardant polyamide material, the high-gloss flame-retardant polyamide material added with the amorphous polyamide has higher surface glossiness.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Wherein:

fig. 1 is a flow chart of a preparation method of a high-gloss flame-retardant polyamide material according to an embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The high-gloss flame-retardant polyamide material comprises, by mass, 50-80 parts of a polyamide base material, 3-20 parts of amorphous polyamide, 8-15 parts of a flame retardant and 4-15.5 parts of an auxiliary agent.

According to the high-gloss flame-retardant polyamide material, the amorphous polyamide is added, the surface of the high-gloss flame-retardant polyamide material can be coated with the amorphous polyamide, and the glossiness of the surface of the amorphous polyamide is higher than that of the polyamide base material, so that the glossiness of the high-gloss flame-retardant polyamide material obtained after the amorphous polyamide is added is improved. Compared with the traditional high-gloss flame-retardant polyamide material, the high-gloss flame-retardant polyamide material added with the amorphous polyamide has higher surface glossiness.

Preferably, the 4-15.5 parts of the auxiliary agent comprise 0.3-1.5 parts of dispersing auxiliary agent, 3-10 parts of toughening agent, 0.2-1 part of antioxidant and 0.5-3 parts of white mineral oil.

The dispersing agent and the white mineral oil can have a dispersing effect on the polyamide base material and the amorphous polyamide, so that the polyamide base material, the amorphous polyamide and the flame retardant are dispersed, the highlight flame-retardant polyamide material is better dispersed, the agglomeration phenomenon is avoided, and the surface roughness of the highlight flame-retardant polyamide material is reduced.

In addition, the dispersing agent and the white mineral oil can have a dispersing effect on the polyamide base material and the amorphous polyamide, and the flame retardant can be better dispersed in the high-gloss flame-retardant polyamide material, so that a better flame-retardant effect can be achieved with a smaller flame retardant amount. As can be seen by combining the data in the test example part, the flame retardant grade of the prepared high-gloss flame-retardant polyamide material can reach (1.6mm) UL 94-V0.

Specifically, the dispersion aid may be selected from at least one of ethylene bis stearamide, stearic acid, erucamide, and silicone.

Specifically, the toughening agent may be selected from at least one of POE grafted maleic anhydride, ethylene propylene diene monomer, ethylene vinyl acetate copolymer, and styrene-butadiene-styrene block copolymer.

Specifically, the antioxidant may be a mixture of 1: 1 or 2: 3 hindered phenol main antioxidant and phosphite ester synergistic antioxidant.

Specifically, the white mineral oil may be selected from at least one of white mineral oil No. 5, white mineral oil No. 7, white mineral oil No. 10, and white mineral oil No. 15.

Preferably, in the present embodiment, the flame retardant is a halogen-free flame retardant.

In particular, the halogen-free flame retardant may be melamine cyanurate with an average particle size of less than 10 μm.

Preferably, in the embodiment, the polyamide base material is polyamide with the viscosity of 1.8-2.8, and the melting temperature of the amorphous polyamide is lower than 200 ℃.

Specifically, the polyamide base stock is PA6, PA66, PALl, PA12, PA46, PA610, PA612 or PA1010 with the viscosity of 1.8-2.8.

The polyamide base material is selected from polyamide with the viscosity of 1.8-2.8, and the viscosity is low, so that the polyamide base material can be better soaked and coated with the flame retardant.

The melting temperature of the amorphous polyamide is lower than 200 ℃, so that the amorphous polyamide can be better coated on the surface of the high-gloss flame-retardant polyamide material.

In one particular embodiment, the high gloss flame retardant polyamide material includes 76 parts of a polyamide base stock, 5 parts of an amorphous polyamide, 12 parts of a flame retardant, 0.5 parts of a dispersing aid, 5 parts of a toughening agent, 0.5 parts of an antioxidant, and 1 part of white mineral oil.

Preferably, in the present invention, the total parts of the components in the high gloss flame retardant polyamide material is 100 parts.

With reference to fig. 1, the present invention also discloses a preparation method of the high gloss flame retardant polyamide material of an embodiment, including the following steps:

s10, uniformly mixing 50-80 parts of polyamide base material, 3-20 parts of amorphous polyamide, 3-10 parts of toughening agent and 0.5-3 parts of white mineral oil according to parts by mass to obtain the premix.

Preferably, the method also comprises the operation of drying 50 to 80 parts of polyamide base stock and 3 to 20 parts of amorphous polyamide at the temperature of between 100 and 120 ℃ for 2 to 3 hours before S10.

S20, uniformly mixing 8-15 parts of flame retardant, 0.3-1.5 parts of dispersing aid, 0.2-1 part of antioxidant and premix according to parts by mass to obtain a mixture.

And S30, melting and granulating the mixture to obtain the highlight flame-retardant polyamide material.

Preferably, the operation of melting and granulating the mixture is as follows: adopting a double-screw extruder to melt and extrude the mixture, cooling, air-drying and granulating, wherein the process parameters of the double-screw extruder are set as follows: the temperature of the first section is 210-220 ℃, the temperature of the second section is 225-235 ℃, the temperature of the third section is 235-245 ℃, the temperature of the fourth section is 235-245 ℃, the temperature of the fifth section is 235-245 ℃, the temperature of the sixth section is 225-235 ℃, the temperature of the seventh section is 225-235 ℃, the temperature of the eighth section is 240-250 ℃, the temperature of the ninth section is 220-230 ℃, the temperature of the machine head is 240-250 ℃, the rotating speed of the main machine is 350-400rpm, and the feeding speed is 25-30 rpm.

In the embodiment, the polyamide base material and the amorphous polyamide are subjected to the pre-dispersion treatment effect through the white mineral oil, so that the polyamide base material, the amorphous polyamide and the flame retardant are pre-dispersed, the mixture can be better dispersed in the subsequent extrusion process, the agglomeration phenomenon cannot occur, and the roughness of the surface of the prepared highlight flame-retardant polyamide material is reduced.

In addition, the pre-dispersion treatment can enable the flame retardant to be better dispersed in the high-gloss flame-retardant polyamide material, so that a better flame-retardant effect can be achieved with a smaller flame retardant amount. As can be seen by combining the data in the test example part, the flame retardant grade of the prepared high-gloss flame-retardant polyamide material can reach (1.6mm) UL 94-V0.

The following are specific examples.

Example 1

According to the mass parts, 76 parts of nylon 6 with the viscosity of 2.0, 5 parts of amorphous polyamide with the melting temperature of about 160 ℃,5 parts of POE grafted maleic anhydride toughening agent and 1 part of white mineral oil No. 10 are placed on a high-speed mixer and are uniformly stirred to obtain a mixed base material for later use.

According to the mass parts, 0.5 part of ethylene bis stearamide and 0.5 part of ethylene bis stearamide are mixed according to the mass ratio of 1: pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] 1, tris [2, 4-di-tert-butylphenyl ] phosphite and 12 parts of melamine cyanurate having an average particle size of less than 10 μm were placed in a high-speed mixer and stirred uniformly to obtain a mixed powder for use.

Putting the obtained mixed base material and the mixed powder into a high-speed mixer together for mixing, and then putting the mixture into a double-screw extruder, wherein the temperature of each section is set as follows: the first stage is 210 plus 220 ℃, the second stage is 225 plus 235 ℃, the third stage is 235 plus 245 ℃, the fourth stage is 235 plus 245 ℃, the fifth stage is 235 plus 245 ℃, the sixth stage is 225 plus 235 ℃, the seventh stage is 225 plus 235 ℃, the eighth stage is 240 plus 250 ℃, the ninth stage is 220 plus 230 ℃, the head is 240 plus 250 ℃, the rotation speed of the main machine is 350 plus 400rpm, and the feeding speed is 25-30 rpm. Finally, cooling the extruded material with water, air-drying and granulating to obtain the required high-gloss flame-retardant polyamide material.

Example 2

The difference from example 1 is that the toughening agent in the mixed base material is removed, and other conditions are not changed.

Example 3

The difference from example 1 is that the white mineral oil in the mixed base stock is removed and the other conditions are not changed.

Example 4

The difference from example 1 is that the dispersant in the powder mixture was removed and the other conditions were not changed.

Comparative example 1

The difference from example 1 is that the amorphous polyamide in the powder mixture was removed and the other conditions were not changed.

Test example 1

The required high-gloss flame-retardant polyamide materials obtained in examples 1 to 4 and comparative example 1 were subjected to material performance characterization, and the following table 1 was obtained.

Table 1: impact strength test, flame retardant grade and surface performance data of five high-gloss flame-retardant polyamide materials

Note: the flame retardant grade of the plastic is gradually increased from HB, V-2 and V-1 to V-0.

As can be seen from table 1, the effect of example 1 is the best, and it can also be seen that comparative example 1 has a great influence on the gloss after removing the amorphous polyamide, the impact performance is improved by the toughening agent, and the flame retardant grade is greatly influenced by the dispersing agent and the pre-dispersion treatment.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.