CN111793266A

CN111793266A - Color masterbatch, preparation method and application thereof, and PE-RT (polyethylene-reverse transcription) pipe

Info

Publication number: CN111793266A
Application number: CN202010825531.XA
Authority: CN
Inventors: 邱艳斌
Original assignee: Ivy Beijing Chemical Technology Co ltd
Current assignee: Ivy Beijing Chemical Technology Co ltd
Priority date: 2020-08-17
Filing date: 2020-08-17
Publication date: 2020-10-20

Abstract

The invention provides a color master batch, a preparation method and application thereof, and a PE-RT (polyethylene-reverse transcription) pipe, which comprises the following raw materials in parts by weight: 45-60 parts of high-density polyethylene, 25-40 parts of linear low-density polyethylene, 10-20 parts of opacifier and 0.03-2.7 parts of inorganic pigment. The color master batch obtained by the invention is safe, environment-friendly, non-toxic and harmless, has excellent temperature resistance stability and processability, and has excellent compatibility with PE-RT pipes; the color master batch is added into the PE-RT pipe, so that the color stability of the product is improved, the temperature resistance stability and the service life of the PE-RT pipe are ensured, and the quality of the PE-RT pipe is not changed and the color is not faded under the long-time temperature resistance effect.

Description

Color masterbatch, preparation method and application thereof, and PE-RT (polyethylene-reverse transcription) pipe

Technical Field

The invention relates to the field of plastic products, in particular to a color masterbatch, a preparation method and application thereof, and a PE-RT pipe.

Background

The PE-RT pipe is a heat-resistant polyolefin pipe, is a substitute product with ideal aging resistance, is widely used for industrial production of heat-resistant pipes, heat-resistant pipes of heating power companies and pipes for floor heating at present, and is a novel environment-friendly pipe which is economical and applicable at present. In the application of the pipe, the color master batch is added according to the requirement to change the color of the pipe. However, the existing PE-RT pipe cannot ensure the quality of the pipe to be unchanged and the color to be fadeless under the long-time temperature resistance.

Disclosure of Invention

The invention aims to provide a color master batch, a preparation method and application thereof, and a PE-RT pipe, wherein the color master batch is safe, environment-friendly, nontoxic and harmless by adopting high-density polyethylene, linear low-density polyethylene, an opacifier and inorganic pigment, and has excellent temperature resistance stability and processability and excellent compatibility with the PE-RT pipe; the color master batch is added into the PE-RT pipe, so that the color stability of the product is improved, the temperature resistance stability and the service life of the PE-RT pipe are ensured, and the quality of the PE-RT pipe is not changed and the color is not faded under the long-time temperature resistance effect.

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

the color masterbatch comprises the following raw materials in parts by weight: 45-60 parts of high-density polyethylene, 25-40 parts of linear low-density polyethylene, 10-20 parts of opacifier and 0.03-2.7 parts of inorganic pigment.

As a further improvement of the technical scheme, the linear low-density polyethylene with the melt index of 15-25 g/10min is adopted.

As a further improvement of the technical scheme, the opacifier comprises nano titanium dioxide and/or nano calcium carbonate;

preferably, the opacifier is rutile type nano titanium dioxide, and the particle size of the nano titanium dioxide is 0.15-0.25 mu m.

As a further improvement of the above technical solution, the inorganic pigment includes at least one of a titanium yellow pigment, an ultramarine blue pigment, an iron oxide pigment and a carbon black pigment.

The preparation method of the color master batch comprises the following steps of (1) preparing the color master batch; the preparation method comprises the following steps:

mixing the raw materials, and then extruding and granulating the obtained mixture.

As a further improvement of the above technical solution, the preparation method comprises:

firstly, stirring and mixing raw materials including high-density polyethylene, linear low-density polyethylene and an opacifier, heating to 80-100 ℃, continuously stirring and mixing for 5-8 min at 80-100 ℃, and then cooling to below 50 ℃ to obtain a first mixture;

stirring and mixing the first mixture and the inorganic pigment, heating to 50-80 ℃, and continuously stirring and mixing at 50-80 ℃ for 5-8 min to obtain a mixture;

putting the mixture into a double-screw extrusion granulator for extrusion granulation;

preferably, the rotating speed of the stirring is 500-1000 rpm.

As a further improvement of the technical scheme, the double-screw extrusion granulator is a parallel co-rotating double-screw extrusion granulator;

preferably, 9 sections of heating sections are arranged between the discharging end and the extruding end of the parallel co-rotating twin-screw extrusion granulator, and in the extrusion granulation process: the blanking temperature is controlled to be 100-150 ℃, the temperature of each section of the 9 sections of heating sections is controlled to be 150-210 ℃, the temperature of the grinding head is controlled to be 150-180 ℃, the temperature of the machine head is controlled to be 150-200 ℃, and the rotating speed of the screw is 180-200 rpm;

preferably, in the extrusion granulation process: two filters are used for filtering before extrusion.

As a further improvement of the above technical solution, the preparation method further comprises: separating the color master batches obtained by the extrusion granulation through a cyclone separator in sequence and placing the color master batches into a homogenizing furnace for homogenization;

preferably, the homogenization time is 51-0 min.

The color master batch is applied to preparation of PE-RT pipes.

The raw materials of the PE-RT pipe comprise the color master batch;

preferably, the color masterbatch accounts for 1-3% of the total mass of the raw materials of the PE-RT pipe.

The invention has the beneficial effects that:

(1) according to the invention, by adopting high-density polyethylene, linear low-density polyethylene, an opacifier and inorganic pigment, the obtained color master batch is safe, environment-friendly, nontoxic and harmless, has excellent temperature resistance stability and processability, and has excellent compatibility with PE-RT pipes; the color master batch is added into the PE-RT pipe, so that the color stability of the product is improved, the temperature resistance stability and the service life of the PE-RT pipe are ensured, and the quality of the PE-RT pipe is not changed and the color is not faded under the long-time temperature resistance effect.

(2) The color master batch disclosed by the invention is simple in preparation process, lower in production cost and less in pollution.

In order to make the aforementioned and other objects, features and advantages of the invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Detailed Description

The terms as used herein:

in the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention.

This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.

The terms as used herein:

"prepared from … …" is synonymous with "comprising". The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

The conjunction "consisting of … …" excludes any unspecified elements, steps or components. If used in a claim, the phrase is intended to claim as closed, meaning that it does not contain materials other than those described, except for the conventional impurities associated therewith. When the phrase "consisting of … …" appears in a clause of the subject matter of the claims rather than immediately after the subject matter, it defines only the elements described in the clause; other elements are not excluded from the claims as a whole.

When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when the range "1 ~ 5" is disclosed, the ranges described should be construed to include the ranges "1 ~ 4", "1 ~ 3", "1 ~ 2 and 4 ~ 5", "1 ~ 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.

In these examples, the parts and percentages are by mass unless otherwise indicated.

"part by mass" means a basic unit of measure indicating a mass ratio of a plurality of components, and 1 part may represent any unit mass, for example, 1g or 2.689 g. If we say that the part by mass of the component A is a part by mass and the part by mass of the component B is B part by mass, the ratio of the part by mass of the component A to the part by mass of the component B is a: b. alternatively, the mass of the A component is aK and the mass of the B component is bK (K is an arbitrary number, and represents a multiple factor). It is unmistakable that, unlike the parts by mass, the sum of the parts by mass of all the components is not limited to 100 parts.

"and/or" is used to indicate that one or both of the illustrated conditions may occur, e.g., a and/or B includes (a and B) and (a or B).

The invention provides a color masterbatch which comprises the following raw materials in parts by weight:

45-60 parts of high-density polyethylene, such as 45 parts, 48 parts, 50 parts, 52 parts, 55 parts, 58 parts or 60 parts;

25-40 parts of linear low-density polyethylene, such as 25 parts, 28 parts, 30 parts, 32 parts, 35 parts, 38 parts or 40 parts;

10-20 parts of a light-shading agent, such as 10 parts, 12 parts, 15 parts, 18 parts or 20 parts;

0.03-2.7 parts of inorganic pigment, such as 0.03 part, 0.05 part, 0.1 part, 0.5 part, 1 part, 1.5 parts, 1.8 parts, 2 parts, 2.3 parts, 2.5 parts or 2.7 parts.

The linear low-density polyethylene preferably has a melt index of 15 to 25g/10 min.

Further, the opacifier comprises nano titanium dioxide and/or nano calcium carbonate.

Preferably, the opacifier adopts rutile type nano titanium dioxide, and the particle size of the nano titanium dioxide is 0.15-0.25 mu m.

It should be noted that the melt index is also called a melt flow index, i.e., a melt mass flow rate, and represents a value of fluidity when a plastic material is processed. The invention preferably adopts linear low-density polyethylene with the melt index of 15-25 g/10min to improve the fluidity of the color master batch, and preferably adopts rutile type nano titanium dioxide with the diameter of 0.15-0.25 mu m as an opacifier, so that the appearance (no burr and the like in the color master batch), the quality and the processing performance of the color master batch can be further improved.

Further, the inorganic pigment includes at least one of a titanium yellow pigment, an ultramarine blue pigment, an iron oxide pigment, and a carbon black pigment.

The invention adopts high-density polyethylene, linear low-density polyethylene, opacifier and inorganic pigment, so that the obtained color master batch is safe, environment-friendly, nontoxic and harmless, has excellent temperature resistance stability and processability, and has excellent compatibility with PE-RT (polyethylene-reverse transcription) pipes; the color master batch is added into the PE-RT pipe, so that the color stability of the product is improved, the temperature resistance stability and the service life of the PE-RT pipe are ensured, and the quality of the PE-RT pipe is not changed and the color is not faded under the long-time temperature resistance effect.

The invention also provides a preparation method of the color master batch, wherein the color master batch is the color master batch; the preparation method comprises the following steps:

Further, the preparation method comprises the following steps:

stirring and mixing the first mixture and the inorganic pigment, heating to 50-80 ℃, and continuously stirring and mixing at 80-100 ℃ for 5-8 min to obtain a mixture;

and (3) placing the obtained mixture in a double-screw extrusion granulator for extrusion granulation.

Preferably, the twin-screw extrusion granulator is a parallel co-rotating twin-screw extrusion granulator.

Preferably, the rotation speed of the stirring is 500 to 1000 rpm.

preferably, in the extrusion granulation process: filtering with two filter screens before extrusion; preferably, each filter screen is 80-100 meshes.

Further, the preparation method of the color masterbatch also comprises the following steps: and separating the color master batch obtained by the extrusion granulation through a cyclone separator in sequence and placing the color master batch in a homogenizing furnace for homogenization so as to improve the uniformity of the appearance and the quality of the color master batch.

Preferably, the homogenization time is 5-10 min.

The invention also provides an application of the color master batch in preparation of PE-RT pipes.

The invention also provides a PE-RT pipe, which comprises the color master batch as a raw material;

preferably, the color masterbatch accounts for 1-3% of the total mass of the raw materials of the PE pipe.

Embodiments of the present invention will be described in detail below with reference to specific examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

Example 1

(1) Weighing 45 parts of high-density polyethylene, 40 parts of linear low-density polyethylene (the melt index is 20g/10min), 10 parts of nano titanium dioxide (rutile type, the particle size is 0.15-0.25 mu m), 1 part of titanium yellow, 0.5 part of ultramarine blue, 0.05 part of ferric oxide and 0.03 part of carbon black.

(2) And uniformly mixing titanium yellow, ultramarine blue, iron oxide and carbon black to obtain the mixed pigment.

(3) Firstly putting high-density polyethylene, linear low-density polyethylene and nano titanium dioxide into a kneader, stirring and mixing while heating to 80 ℃, continuously stirring and mixing for 8min at 80 ℃, then cooling to below 50 ℃, adding the mixed pigment, heating to 70 ℃, stirring and mixing for 8min, and obtaining a mixture.

(4) Putting the obtained mixture into a parallel co-rotating twin-screw extrusion granulator for extrusion granulation; wherein, the blanking temperature is controlled at 130 ℃, and the heating section is from 1 to 9: the temperature is selected from 150 ℃, 180 ℃, 175 ℃ and 175 ℃ in sequence; the temperature of the grinding head is controlled to be 175 ℃, and the temperature of the machine head is controlled to be 180 ℃; the screw rotation speed is 200 rpm; two filtering steps are adopted before extrusion, wherein the first filtering step adopts a 80-mesh filter screen, and the second filtering step adopts a 100-mesh filter screen.

(5) And (4) separating the color master batch obtained in the step (4) into finished particles through a cyclone separator, homogenizing in a homogenizing furnace for 10min, selecting an inner lining plastic bag and an outer lining kraft paper bag for packaging, and performing sub-packaging according to 25 KG/bag.

Example 2

This example differs from example 1 in that: replacing the step (1) with: weighing 50 parts of high-density polyethylene, 35 parts of linear low-density polyethylene (the melt index is 18g/10min), 12 parts of nano titanium dioxide (rutile type, the particle size is 0.15-0.25 mu m), 1 part of titanium yellow, 0.5 part of ultramarine blue, 0.05 part of ferric oxide and 0.03 part of carbon black.

Example 3

This example differs from example 1 in that: replacing the step (1) with: weighing 45 parts of high-density polyethylene, 40 parts of linear low-density polyethylene (the melt index is 20g/10min), 1.2 parts of titanium yellow, 0.8 part of ultramarine blue, 0.08 part of ferric oxide and 0.05 part of carbon black, wherein the particle size of the titanium white is 0.15-0.25 mu m.

Example 4

This example differs from example 1 in that: replacing the step (1) with: 45 parts of high-density polyethylene, 40 parts of linear low-density polyethylene (with the melt index of 20g/10min), 1.5 parts of nano calcium carbonate, 1 part of titanium yellow, 1 part of ultramarine blue, 0.1 part of ferric oxide and 0.1 part of carbon black are weighed.

Comparative example 1

This example differs from example 1 in that: the procedure of example 1 was repeated except that the high-density polyethylene was removed.

Comparative example 2

This example differs from example 1 in that: the linear low density polyethylene was removed and the procedure of example 1 was repeated.

Comparative example 3

This example differs from example 1 in that: the procedure of example 1 was repeated except that the titanium pigment nanoparticles were removed.

Comparative example 4

The existing common color master batch sold in the market is adopted.

The color master batches of the examples 1 to 4 and the comparative examples 1 to 4 are added into the raw material of the PE-RT pipe according to the addition amount of 2% of the total mass of the raw material of the PE-RT pipe, and the PE-RT pipe corresponding to the examples 1 to 4 and the comparative examples 1 to 4 is produced.

1. Performing temperature resistance test on the obtained PE-RT pipe at 110 ℃ according to KIWA BRL 5609, and recording the time length of the PE-RT pipe reaching damage and the time length of the PE-RT pipe beginning to change in color;

2. and performing a cold and hot circulation test on the obtained PE-RT pipe by using cold and hot water at the temperature of-40-80 ℃ under the condition of 0.6Mpa by referring to GB/T28799-.

The results of the above experiments are shown in table 1 below.

TABLE 1

And (4) conclusion: the color master batch prepared by the invention is added into the PE-RT pipe, so that the PE-RT pipe has excellent temperature resistance stability, and the quality and the color of the PE-RT pipe are not changed under the long-time temperature resistance effect.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims above, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Claims

1. The color masterbatch is characterized by comprising the following raw materials in parts by weight: 45-60 parts of high-density polyethylene, 25-40 parts of linear low-density polyethylene, 10-20 parts of opacifier and 0.03-2.7 parts of inorganic pigment.

2. The color masterbatch according to claim 1, wherein the linear low density polyethylene has a melt index of 15-25 g/10 min.

3. The color concentrate of claim 1, wherein the opacifier comprises nano titanium dioxide and/or nano calcium carbonate;

4. The color concentrate of claim 1, wherein the inorganic pigment comprises at least one of a titanium yellow pigment, an ultramarine blue pigment, an iron oxide pigment, and a carbon black pigment.

5. A preparation method of a color masterbatch, which is characterized in that the color masterbatch is the color masterbatch of any one of claims 1 to 4; the preparation method comprises the following steps:

6. The process for the preparation of the color concentrate according to claim 5, characterized in that it comprises:

preferably, the rotating speed of the stirring is 500-1000 rpm.

7. The preparation method of the color masterbatch according to claim 6, wherein the twin-screw extrusion granulator is a parallel co-rotating twin-screw extrusion granulator;

8. The method of preparing the color concentrate of claim 6, further comprising: separating the color master batches obtained by the extrusion granulation through a cyclone separator in sequence and placing the color master batches into a homogenizing furnace for homogenization;

preferably, the homogenization time is 5-10 min.

9. Use of a colour concentrate according to any one of claims 1 to 4 in the preparation of PE-RT tubing.

10. A PE-RT pipe is characterized in that raw materials comprise the color masterbatch as claimed in any one of claims 1 to 4;