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Improving method for rigid chain liquid crystal polymer and flexible chain nylon compatibility

A technology of liquid crystal polymers and compatibility, applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve the problems of difficulty in obtaining compatible composite materials, limited improvement of compatibility, and increased processing costs, and achieve durable Effects of chemical corrosion on physical and chemical properties, low thermal expansion coefficient, and reduction in processing costs

Inactive Publication Date: 2008-08-06
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the ternary blend system with the addition of compatibilizers requires a comparative study of different proportions due to the extremely strict requirements on the proportion of the components, which not only increases the processing cost, but also complicates the preparation process.
Although changing the molecular structure of polyester liquid crystal polymer can promote the mutual entanglement with nylon molecules, but because the interaction between molecules is still weak, the degree of compatibility improvement is limited, and it is difficult to obtain composite materials with better compatibility. Often only extremely complex processes such as reactive extrusion can be used to achieve partial compatibility under very harsh conditions

Method used

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  • Improving method for rigid chain liquid crystal polymer and flexible chain nylon compatibility
  • Improving method for rigid chain liquid crystal polymer and flexible chain nylon compatibility
  • Improving method for rigid chain liquid crystal polymer and flexible chain nylon compatibility

Examples

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Comparison scheme
Effect test

example 1

[0032] Example 1: Melt blending of thermotropic polyamide liquid crystal (a) (TLCPa) and nylon 66 (PA66)

[0033] Step (1): Synthesis of Polyamide Liquid Crystal Polymer

[0034] Take the strictly dried polyethylene glycol bis-4-carboxyphenyl ether (PEG 2 ) 29.82g, polyethylene glycol bis-4-carboxyphenyl ether (PEG 3 ) 33.62g, o-toluidine (OT) 36.56g, anhydrous lithium chloride (LiCl) 146.01g, refined triphenyl phosphite (TPP) 1335.95g, pyridine (PY) 345ml, N-methylpyrrolidone (NMP)689ml, of which PEG 2 、PEG 3 The ratio of the amount of the three monomers of , OT is 1 / 1 / 2, under the condition of nitrogen protection, under the temperature of 120 ℃, stir at a constant speed, and the copolymerization reaction is 2h;

[0035]Put the system after the copolymerization reaction into the constantly stirring methanol solvent to precipitate the copolymerization product evenly. After the precipitate is filtered with a vacuum filter, it is repeatedly washed and compacted with distille...

example 2

[0041] Example 2: Melt blending of thermotropic polyamide liquid crystal (a) and nylon 6

[0042] Step (1): Same as step 1 of Example 1;

[0043] Step (2): blending of polyamide liquid crystal polymer (a) and nylon 6

[0044] 1) Firstly, the polyamide liquid crystal polymer (a) is blended with nylon 6 at a mass ratio of 10%, 20%, 30%, 40%, and 50%, respectively, and then vacuum-dried at 80°C for 48h, and then the polyamide The liquid crystal polymer (a) is simply mechanically pre-mixed with nylon 6, so that the two are fully mixed and uniform;

[0045] 2) Add the mixture of the pre-mixed polyamide liquid crystal polymer (a) and nylon 6 into the extruder for melt blending, the number of revolutions per minute (rpm) of the rotor is 100, according to the principle of melting point matching, make it Melt blending with nylon 6, the melting temperature is 240°C, and the blending time is 15min.

[0046] After melt-blending the thermotropic polyamide liquid crystal (a) with nylon 6...

example 3

[0047] Example 3: Melt blending of thermotropic polyamide liquid crystal (a) and nylon 1010

[0048] Step (1): Same as example 1 step (1);

[0049] Step (2): Blending of Polyamide Liquid Crystal Polymer and Nylon 1010

[0050] 1) First, the polyamide liquid crystal polymer (a) is blended with nylon 1010 at a mass ratio of 10%, 20%, 30%, 40%, and 50%, respectively, and then vacuum-dried at 70°C for 56h, and then the polyamide Liquid crystal polymer (a) and nylon 1010 are simply mechanically pre-mixed, so that the two are fully mixed and uniform;

[0051] 2) Add the mixture of the pre-mixed polyamide liquid crystal polymer (a) and nylon 1010 into the extruder for melt blending, the number of revolutions per minute (rpm) of the rotor is 50, according to the principle of melting point matching, make it Melt blending with nylon 1010, the melting temperature is 230°C, and the blending time is 10min.

[0052] After melt-blending thermotropic polyamide liquid crystal (a) and nylon ...

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Abstract

The method of improving the compatibility between liquid crystal polymer with rigid chain and nylon with flexible chain is suitable for the compatibility modification of nylon. The method includes the first synthesizing polyamide of smelting point of 223-284deg.c as the liquid crystal polymer with o-tolidine, PEG2 and PEG3 monomers; pre-mixing the polyamide and nylon with fitting smelting point in the weight ratio of 5 to 95-50 to 50; and smelting the mixture in an extruder to obtain the well compatible liquid crystal polyamide reinforced nylon material. The present invention utilizes intermolecular hydrogen bonding in improving the compatibility between liquid crystal polymer and nylon, and simplifies the triphase reinforcing system into a biphase one.

Description

technical field [0001] The invention is a method for improving the compatibility of a rigid chain liquid crystal polymer and a flexible chain nylon, which is suitable for compatibilization modification of nylon. Background technique [0002] Among thermoplastic resins, nylon is currently the most widely used type of engineering plastics. It has the following characteristics: excellent mechanical strength, good toughness, stress cracking resistance, good wear resistance and corrosion resistance, and good molding processability, etc. . As an engineering plastic, its disadvantages are high water absorption, poor dimensional stability and electrical properties, poor heat resistance and low-temperature impact strength, so it cannot meet some applications that require environmental stress resistance and high processing accuracy. [0003] In view of the advantages and disadvantages of nylon itself, and due to the inherent strength and rigidity of thermotropic liquid crystal polyme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/00C09K19/38B29B7/00B29C47/00
Inventor 张文熊张卓郭鸿俊
Owner BEIJING UNIV OF TECH
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