CN116102863A - Super-impact-resistant polycarbonate material and preparation method thereof - Google Patents

Abstract

A super impact-resistant polycarbonate material and a preparation method thereof, wherein the raw materials of the material comprise: 80-95 parts of polycarbonate resin or siloxane polycarbonate; 2-5 parts of a toughening agent; 2-10 parts of inorganic nano silicon-containing material; 0.2-2 parts of lubricant; 0.2-0.5 part of antioxidant; 0.2-0.6 parts of light stabilizer; 0.2-0.6 parts of flame retardant; 0.4-1 parts of anti-falling agent. The preparation method comprises the following steps: 1. weighing the components according to requirements; 2. adding the components into a high-speed mixer for mixing and stirring until the components are uniform, and obtaining a mixed material; 3. putting the mixed material into a double-screw extruder for melt kneading and extrusion; 4. the extruded molten output is cooled and pelletized. The invention selects the toughening agent with excellent performance and siloxane polycarbonate, and forms a special toughening network by adding a proper amount of nano filling inorganic matters, so that the IZOD notch impact strength of the polycarbonate at normal temperature reaches 1400J/m and the IZOD notch impact strength reaches 800J/m at-40 ℃.

Description

Super-impact-resistant polycarbonate material and preparation method thereof

Technical Field

The invention relates to the technical field of engineering plastics, in particular to a super impact-resistant polycarbonate material and a preparation method thereof.

Background

The IZOD notch impact strength of the polycarbonate at normal temperature can reach 800J/m, and only 100J/m at the low temperature of minus 40 ℃, so that the toughening agent is added or siloxane polycarbonate is matched to improve the low-temperature impact resistance, the IZOD notch impact strength of the polycarbonate at the temperature of minus 40 ℃ can reach 500J/m, and the polycarbonate is a relatively excellent result at present.

Currently, the impact resistant polycarbonates known in the market, including foreign imported products, have IZOD notched impact strengths at both normal and low temperatures far below the higher product performance required in the market. In some special application scenes with light weight and high impact resistance, such as special protective equipment, shells and the like, further technical requirements still cannot be met.

Therefore, how to solve the above-mentioned drawbacks of the prior art is a subject to be studied and solved by the present invention.

Disclosure of Invention

The invention aims to provide a super impact-resistant polycarbonate material and a preparation method thereof.

In order to achieve the above purpose, the invention adopts the following technical scheme:

the super impact resistant polycarbonate material comprises the following raw materials in parts by weight:

80-95 parts of polycarbonate resin or siloxane polycarbonate;

2-5 parts of toughening agent;

2-10 parts of inorganic nano silicon-containing material;

0.2-2 parts of lubricant;

0.2 to 0.5 part of antioxidant;

0.2 to 0.6 part of light stabilizer;

0.2 to 0.6 part of flame retardant;

0.4 to 1 part of anti-falling agent.

In a further embodiment, the polycarbonate resin consists of a transesterification-or phosgene-based polycarbonate, preferably a siloxane polycarbonate resin.

According to a further technical scheme, the toughening agent is MBS, ACR or organic silicon-acrylic resin, preferably organic silicon-acrylic resin.

According to a further technical scheme, the inorganic nano silicon-containing material is one or more of nano silicon dioxide, nano talcum powder and other silicon-containing inorganic matters.

Further embodiments, the lubricant may be pentaerythritol tetrastearate PETS.

According to a further technical scheme, the antioxidant can be pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate (antioxidant 1010) and tris (2, 4-di-tert-butylphenyl) phosphite (antioxidant 168) which are compounded according to a weight ratio of 2:1.

Further technical scheme, the light stabilizer can be at least one of salicylates, benzoates, benzophenones, benzotriazoles, substituted acrylonitrile, oxamides, organonickel complexes or hindered amine light stabilizers.

In a further embodiment, the flame retardant may be selected from aromatic sulfonate systems.

Further embodiments, the anti-drip agent may be selected from polytetrafluoroethylene powders, such as Dajin FA-500.

Further, the invention also comprises a preparation method of the super impact resistant polycarbonate material, which comprises the following steps:

firstly, weighing a toughening agent and an inorganic nano silicon-containing material according to the component content requirement, and weighing polycarbonate resin or siloxane polycarbonate and half of an antioxidant which are the same as the total amount of the toughening agent and the inorganic nano silicon-containing material;

step two, adding the weighed components in the step one into a high-speed mixer, and mixing and stirring at a rotating speed of 1000r/min for at least 5min until the components are uniform to obtain a mixed material A;

step three, putting the mixed material A obtained in the step two into a first double-screw extruder with strong shearing for melt kneading and extrusion, wherein the extrusion temperature is 210-320 ℃, the screw rotation speed is 160-350 rpm, and preparing super-tough master batches for standby after cooling and granulating;

weighing the super-tough master batch obtained in the step three and other components which are not added in the process of preparing the super-tough master batch, adding a high-speed mixer, and mixing and stirring at a rotating speed of 1000r/min for at least 2min until the components are uniform to obtain a mixed material B;

step five, putting the mixed material B obtained in the step four into a second double-screw extruder with moderate weak shearing to perform melt kneading to form a super-tough network, and extruding, wherein the extruding temperature is 210-280 ℃, and the screw rotating speed is 160-350 rpm; the shear force of the second twin-screw extruder is smaller than that of the first twin-screw extruder;

and step six, cooling the molten output extruded by the die head of the second double-screw extruder, and preparing granules, namely the super impact polycarbonate material.

The working principle and the advantages of the invention are as follows:

(1) the invention solves the technical bottleneck that the impact strength of the polycarbonate material at the low temperature of minus 40 ℃ IZOD can only reach 500J/m, can reach 800J/m, and the impact strength of the IZOD at normal temperature reaches 1400J/m, which is far higher than that of the existing products in the market;

(2) the invention solves the defects that the material is inflammable and the softening temperature and rigidity of the material are reduced when the impact performance is improved by singly using the toughening agent, the flame retardant property of the polycarbonate can reach the UL-94 level of 1.5mm V-0, and the load deformation temperature of 1.82Mpa still reaches 120-130 ℃;

(3) the invention provides a technical route of a material with the performances of rigidity, super-high toughness at normal temperature and low temperature, heat resistance, flame retardance and the like.

In summary, the invention selects the toughening agent with excellent performance, siloxane polycarbonate and adds a proper amount of nano-filling inorganic matters to form a special toughening network, so that the IZOD notch impact strength of the polycarbonate at normal temperature reaches 1400J/m and at-40 ℃ reaches 800J/m, and the material with the highest IZOD notch impact strength in normal temperature and ultra-low temperature environments in the prior known materials. The method can be widely applied to application scenes with extremely high requirements on impact resistance, such as lightweight high-performance protective equipment and industrial impact resistant parts.

The product of the invention has the following properties:

ASTM D256 IZOD notched impact strength, 1400J/m at 23℃and 800J/m at-40 ℃;

ASTM D648.82 MPa load deformation temperature, 120-130 ℃;

the flame retardant property of UL-94 can reach 1.5mm V-0;

ASTM D638 tensile strength 55-62 MPa, elongation at break 110%;

ASTM D790 flexural strength 85-90 MPa, flexural modulus 2200MPa.

Detailed Description

The invention is further described below with reference to examples:

the following detailed description will clearly illustrate the present invention, and it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made in the technology taught herein without departing from the spirit and scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. Singular forms such as "a," "an," "the," and "the" are intended to include the plural forms as well, as used herein. As used herein, the terms "comprising," "including," "having," and the like are intended to be open-ended terms, meaning including, but not limited to.

The term (terms) as used herein generally has the ordinary meaning of each term as used in this field, in this disclosure, and in the special context, unless otherwise noted. Certain terms used to describe the present disclosure are discussed below, or elsewhere in this specification, to provide additional guidance to those skilled in the art in connection with the description herein.

Example 1

The super impact polycarbonate material of the embodiment comprises the following components in parts by weight:

the polycarbonate resin is bisphenol A polycarbonate by transesterification, and the polycarbonate resin or siloxane polycarbonate is used in an amount of 92 parts.

The toughening agent is MBS, ACR or organic silicon-acrylic resin, the dosage of the toughening agent is 2-5 parts, and the low-temperature impact modifier of the organic silicon-acrylic resin is siliconized polycarbonate.

The inorganic nano silicon-containing material is one or more of nano silicon dioxide, nano talcum powder and other silicon-containing inorganic matters.

The lubricant is pentaerythritol tetrastearate PETS.

The antioxidant is pentaerythritol tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate (antioxidant 1010) and tri (2, 4-di-tert-butylphenyl) phosphite (antioxidant 168) which are compounded according to the weight ratio of 2:1.

The light stabilizer is at least one of salicylates, benzoates, benzophenones, benzotriazoles, substituted acrylonitrile, oxamides, organonickel complexes or hindered amine light stabilizers.

The flame retardant is selected from aromatic sulfonate systems.

The anti-dripping agent is selected from polytetrafluoroethylene powder, dajin FA-500.

A preparation method of a super impact resistant polycarbonate material comprises the following steps:

step one, weighing a toughening agent and an inorganic nano silicon-containing material according to the requirements of component content recorded in claim 1, and weighing polycarbonate resin or siloxane polycarbonate and a half of antioxidant which are the same as the total amount of the toughening agent and the inorganic nano silicon-containing material;

step two, adding the weighed components in the step one into a high-speed mixer, and mixing and stirring at a rotating speed of 1000r/min for at least 5min until the components are uniform to obtain a mixed material A;

step three, putting the mixed material A obtained in the step two into a first double-screw extruder with strong shearing for melt kneading and extrusion, wherein the extrusion temperature is 210-320 ℃, the screw rotation speed is 160-350 rpm, and preparing super-tough master batches for standby after cooling and granulating;

weighing the super-tough master batch obtained in the step three and other components which are not added in the process of preparing the super-tough master batch, adding a high-speed mixer, and mixing and stirring at a rotating speed of 1000r/min for at least 2min until the components are uniform to obtain a mixed material B;

step five, putting the mixed material B obtained in the step four into a second double-screw extruder with moderate weak shearing to perform melt kneading to form a super-tough network, and extruding, wherein the extruding temperature is 210-280 ℃, and the screw rotating speed is 160-350 rpm; the shear force of the second twin-screw extruder is smaller than that of the first twin-screw extruder;

and step six, cooling the molten output extruded by the die head of the second double-screw extruder, and preparing granules, namely the super impact polycarbonate material.

Examples 2 to 4

The materials and preparation methods used for the super impact polycarbonate materials of examples 2 to 4 are substantially the same as those of example 1, except that the specific components and proportions are shown in Table 1:

TABLE 1 composition and usage tables for examples 1-4 and comparative examples 1-2

Comparative example 1

This comparative example is essentially identical to the starting materials and components of example 1, except that: comparative example 1 was free of inorganic nano-silicon-containing materials and toughening agents.

Comparative example 2

This comparative example is essentially identical to the starting materials and components of example 1, except that: comparative example 2 was added with inorganic nano silicon-containing material, but no toughening agent was added.

Comparative example 3

This comparative example is essentially identical to the starting materials and components of example 1, except that: the toughening agent is added in comparative example 3, but no inorganic nano silicon-containing material is added.

Table 2 results of performance test table

Therefore, the invention selects the toughening agent with excellent performance, siloxane polycarbonate and adds proper nano-filler inorganic matter to form a special toughening network, so that the IZOD notch impact strength of the polycarbonate reaches 1400J/m at normal temperature and 800J/m at minus 40 ℃, and the material with the highest IZOD notch impact strength in normal temperature and ultra-low temperature environments is the material in the prior known materials. The method can be widely applied to application scenes with extremely high requirements on impact resistance, such as lightweight high-performance protective equipment and industrial impact resistant parts.

The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.

Claims (10)

1. A super impact polycarbonate material, characterized in that: the raw materials comprise the following components in parts by weight:

80-95 parts of polycarbonate resin or siloxane polycarbonate;

2-5 parts of a toughening agent;

2-10 parts of inorganic nano silicon-containing material;

0.2-2 parts of lubricant;

0.2-0.5 part of antioxidant;

0.2-0.6 parts of light stabilizer;

0.2-0.6 parts of flame retardant;

0.4-1 parts of anti-falling agent.

2. The super impact polycarbonate material according to claim 1, wherein: the polycarbonate resin is composed of transesterification-method polycarbonate or phosgene-method polycarbonate.

3. The super impact polycarbonate material according to claim 1, wherein: the toughening agent is MBS, ACR or organic silicon-acrylic resin.

4. The super impact polycarbonate material according to claim 1, wherein: the inorganic nano silicon-containing material is one or more of nano silicon dioxide, nano talcum powder and other silicon-containing inorganic matters.

5. The super impact polycarbonate material according to claim 1, wherein: the lubricant is pentaerythritol tetrastearate PETS.

6. The super impact polycarbonate material according to claim 1, wherein: the antioxidant is the compound of pentaerythritol tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and tri (2, 4-di-tert-butylphenyl) phosphite in a weight ratio of 2:1.

7. The super impact polycarbonate material according to claim 1, wherein: the light stabilizer is at least one of salicylates, benzoates, benzophenones, benzotriazoles, substituted acrylonitrile, oxamides, organonickel complexes or hindered amine light stabilizers.

8. The super impact polycarbonate material according to claim 1, wherein: the flame retardant is selected from aromatic sulfonate systems.

9. The super impact polycarbonate material according to claim 1, wherein: the anti-dripping agent is selected from polytetrafluoroethylene powder.

10. A preparation method of a super impact resistant polycarbonate material is characterized by comprising the following steps: a method for preparing the super impact polycarbonate material of any one of claims 1 to 9, the preparation method comprising:

step one, weighing a toughening agent and an inorganic nano silicon-containing material according to the requirements of component content recorded in claim 1, and weighing polycarbonate resin or siloxane polycarbonate and a half of antioxidant which are the same as the total amount of the toughening agent and the inorganic nano silicon-containing material;

step two, adding the weighed components in the step one into a high-speed mixer, and mixing and stirring at a rotating speed of 1000r/min for at least 5min until the components are uniform to obtain a mixed material A;

step three, putting the mixed material A obtained in the step two into a first double-screw extruder for melt kneading and extrusion, wherein the extrusion temperature is 210-320 ℃, the screw rotation speed is 160-350 rpm, and preparing super-tough master batches for standby after cooling and granulating;

weighing the super-tough master batch obtained in the step three and other components which are not added in the process of preparing the super-tough master batch, adding a high-speed mixer, and mixing and stirring at a rotating speed of 1000r/min for at least 2min until the components are uniform to obtain a mixed material B;

step five, putting the mixed material B obtained in the step four into a second double-screw extruder for melt kneading to form a super-tough network, and extruding, wherein the extruding temperature is 210-280 ℃, and the screw rotating speed is 160-350 rpm; the shear force of the second twin-screw extruder is smaller than that of the first twin-screw extruder;

and step six, cooling the molten output extruded by the die head of the second double-screw extruder, and preparing granules, namely the super impact polycarbonate material.