阅读说明：本技术 一种高抗冲cpvc注塑管件及其制备方法 (High-impact-resistance CPVC (chlorinated polyvinyl chloride) injection molding pipe fitting and preparation method thereof ) 是由 陈建溢 孙立坤 姚宏华 时劲松 项梁 于 2021-09-08 设计创作，主要内容包括：本发明涉及高分子材料技术领域,尤其涉及一种高抗冲CPVC注塑管件及其制备方法。在常规CPVC树脂配方体系中添加丙烯酸酯类加工助剂ACR会使得原本流动性差的CPVC树脂熔体粘度增大。基于上述问题,本发明提供一种高抗冲CPVC注塑管件,本发明采用VCE树脂替代加工ACR,并与抗冲改性剂MBS配合使用相比于采用VCE树脂与抗冲改性剂CPE配合使用,更能有效改善CPVC注塑管件的物理性能,降低其在加工过程中的扭矩,提高其加工流动性,对提高CPVC注塑管件的综合性能十分有利。(The invention relates to the technical field of high polymer materials, in particular to a high-impact CPVC injection molding pipe fitting and a preparation method thereof. The addition of the acrylate-based processing aid ACR to conventional CPVC resin formulation systems increases the melt viscosity of the otherwise poor flowing CPVC resin. Based on the problems, the invention provides a high-impact CPVC injection pipe fitting, VCE resin is adopted to replace processing ACR, and compared with VCE resin and impact modifier MBS, the invention has the advantages that VCE resin is adopted to be matched with impact modifier CPE, the physical property of the CPVC injection pipe fitting can be effectively improved, the torque of the CPVC injection pipe fitting in the processing process is reduced, the processing fluidity of the CPVC injection pipe fitting is improved, and the improvement of the comprehensive performance of the CPVC injection pipe fitting is very beneficial.)

1. The high-impact CPVC injection molding pipe fitting is characterized by comprising the following components in parts by weight:

2. a high impact CPVC injection molded pipe as claimed in claim 1, wherein said CPVC resin is injection molded grade with chlorine content of 67% to 68%.

3. A high impact CPVC injection molded pipe as claimed in claim 1, wherein said functional modifier is VCE resin.

4. A high impact CPVC injection molded pipe as claimed in claim 1, wherein said stabilizer is methyltin mercaptide YT-181.

5. A high impact CPVC injection molded pipe as claimed in claim 1, wherein said internal lubricant is calcium stearate.

6. A high impact CPVC injection molded pipe as claimed in claim 1, wherein said external lubricant is a mixture of OPE wax and PE wax.

7. A high impact CPVC injection molded pipe as claimed in claim 1, wherein said impact modifier is santoprene MBS BL-126.

8. A high impact CPVC injection molded pipe part according to any one of claims 1 to 7, prepared by the following steps:

(1) adding the raw materials into a hot mixing pot of a high-low speed mixing unit according to the formula amount, heating and mixing at a high speed, wherein the mixing speed is 900-1000r/min, raising the temperature of the hot mixing pot to 110-120 ℃ within 10-12 min, and then putting the hot mixing pot into a cold mixing pot, stirring and cooling to room temperature to obtain the CPVC dry mixed material;

(2) extruding and granulating the CPVC dry blend through a double-screw extruder to obtain CPVC granules;

(3) and (3) preparing the CPVC granules by an injection molding machine to obtain the injection molding pipe fitting.

9. The high impact CPVC injection molded pipe of claim 8, wherein said twin screw extrusion granulation process parameters are: the feeding speed of the double-screw extruder is 25 rpm; the rotating speed of the double-screw extruder is 30 rpm; the temperature of the double-screw extruder is controlled by zones, the temperature of the first zone is 172-plus-178 ℃, the temperature of the second zone is 185-plus-190 ℃, the temperature of the third zone is 190-plus-195 ℃, the temperature of the fourth zone is 193-plus-198 ℃, the traction speed is 1-2m/min, the water-cooling granulation is adopted in a granulation mode, and the particle length is controlled at 4 mm.

10. The high impact CPVC injection molded pipe fitting of claim 8, wherein said injection molding machine set-out process parameters are: the temperature of a charging barrel of the injection molding machine is controlled in a partitioning mode, wherein the temperature of a first area is 170-175 ℃, the temperature of a second area is 172-175 ℃, the temperature of a third area is 175-180 ℃, the temperature of a fourth area is 180-185 ℃, and the temperature of a nozzle is 190-195 ℃; the back pressure is 0-5 bar; the mold closing time of the injection molding machine is 1-3 s;

injecting the CPVC melt in a molten state into a mould through a nozzle, wherein the injection speed is 55-80% of the maximum speed, and the injection pressure is 50-70 bar; the pressure maintaining pressure is 55-60bar, the pressure maintaining time is 2-5s, and the cooling time is 2-5 s; opening the mold for 1-4 s; the demolding time is 1-3 s.

Technical Field

The invention relates to the technical field of high polymer materials, in particular to a high-impact CPVC injection molding pipe fitting and a preparation method thereof.

Background

Chlorinated polyvinyl chloride (CPVC) is a product obtained by further chlorinating polyvinyl chloride (PVC), and the chlorine content can reach 63% -73%. Compared with PVC and CPVC which are novel engineering plastics, a large number of chlorine atoms in the molecular structure endow the CPVC with stronger polarity, the chain segment rigidity is enhanced, and the intermolecular force is increased. Has the characteristics of weather resistance, corrosion resistance, aging resistance, heat deformation resistance, flame retardance, self-extinguishing property and the like. The method is widely applied to various fields such as various pipes, pipe fittings, sectional materials, sheets, foam materials, coatings and the like.

However, CPVC has high melt viscosity, poor flowability, difficult processing and high decomposition tendency due to its characteristics of large intermolecular force, high chlorine content, and the like. In addition, the high processing torque makes the CPVC unable to adapt to conventional PVC forming equipment, further compressing production space.

Increasing the melt fluidity by increasing the processing temperature accelerates the dechlorination of the CPVC, reduces the product performance and facilitates paste pasting. At present, an acrylate processing aid ACR is generally used in a CPVC injection molding pipe fitting formula to improve the processability of the CPVC injection molding pipe fitting, and more lubricant is added to reduce the melt viscosity and improve the flowability of the CPVC injection molding pipe fitting. This is one of the important reasons that restrict the spread of CPVC products.

Disclosure of Invention

Aiming at the problems in the prior art, the technical problems to be solved by the invention are as follows: the addition of the acrylate-based processing aid ACR to conventional CPVC injection molding formulation systems increases the melt viscosity of the inherently poor flowing CPVC resin, while the addition of more lubricant to the formulation often results in a decrease in the impact resistance of the CPVC article.

The technical scheme adopted by the invention for solving the technical problems is as follows: the invention provides a high-impact CPVC (chlorinated polyvinyl chloride) injection molding pipe fitting which comprises the following components in parts by weight:

CPVC resin 100 parts

1-3 parts of functional modifier

0.1-0.5 part of petroleum resin

3-4 parts of stabilizer

1-2 parts of internal lubricant

1.5 to 3.0 portions of external lubricant

6-10 parts of impact modifier

3-7 parts of inorganic filler

0.3-0.6 part of pigment.

Specifically, the CPVC resin is injection molding grade, and the chlorine content is 67-68%.

Specifically, the functional modifier is a VCE resin.

Specifically, the stabilizer is methyltin mercaptide YT-181.

Specifically, the internal lubricant is calcium stearate.

Specifically, the external lubricant is a mixture of OPE wax and PE wax.

Specifically, the impact modifier is Shandong Ruifeng MBS BL-126.

Specifically, the high impact CPVC injection molding pipe fitting is prepared according to the following steps:

(1) adding the raw materials into a hot mixing pot of a high-low speed mixing unit according to the formula amount, heating and mixing at a high speed, wherein the mixing speed is 900-1000r/min, raising the temperature of the hot mixing pot to 110-120 ℃ within 10-12 min, and then putting the hot mixing pot into a cold mixing pot, stirring and cooling to room temperature to obtain the CPVC dry mixed material;

(2) extruding and granulating the dry mixture through a double-screw extruder to obtain CPVC granules;

(3) and (3) preparing the CPVC granules by an injection molding machine to obtain the injection molding pipe fitting.

Specifically, the parameters of the twin-screw extrusion granulation process are as follows: the feeding speed of the double-screw extruder is 25 rpm; the rotating speed of the double-screw extruder is 30 rpm; the temperature of the double-screw extruder is controlled by adopting subareas, wherein the temperature of the first area is 172-plus-178 ℃, the temperature of the second area is 185-plus-190 ℃, the temperature of the third area is 190-plus-195 ℃ and the temperature of the fourth area is 193-plus-198 ℃. The traction speed is 1-2m/min, the grain cutting mode adopts water cooling grain cutting, and the grain length is controlled to be about 4 mm.

Specifically, the sample preparation technological parameters of the injection molding machine are as follows: the temperature of a charging barrel of the injection molding machine is controlled in a partitioning mode, wherein the temperature of a first area is 170-175 ℃, the temperature of a second area is 172-175 ℃, the temperature of a third area is 175-180 ℃, the temperature of a fourth area is 180-185 ℃, and the temperature of a nozzle is 190-195 ℃; the back pressure is 0-5 bar; the mold closing time of the injection molding machine is 1-3 s;

injecting the CPVC melt in a molten state into a mould through a nozzle, wherein the injection speed is 55-80% of the maximum speed, and the injection pressure is 50-70 bar; the pressure maintaining pressure is 55-60bar, and the pressure maintaining time is 2-5 s; the cooling time is 2-5 s; opening the mold for 1-4 s; the demolding time is 1-3 s.

The invention has the beneficial effects that:

(1) compared with the cooperation of VCE resin and a processing aid CPE, the cooperation of VCE resin and Shandongfeng MBS BL-126 has better synergistic effect, can obviously improve the processing performance of the CPVC injection pipe fitting, reduce the torque of the CPVC injection pipe fitting in the processing process, improve the processing fluidity of the CPVC injection pipe fitting and greatly improve the comprehensive performance of the CPVC injection pipe fitting;

(2) the chlorine-containing VCE resin has good compatibility with the CPVC, can improve the chlorine content of a CPVC product, and is very beneficial to improving the flame retardance of a CPVC injection molding pipe;

(3) in the invention, a small amount of petroleum resin is added into the CPVC resin system, so that the comprehensive performance of the CPVC is further improved.

Detailed Description

The present invention will now be described in further detail with reference to examples.

The CPVC resin adopted in the following examples of the invention is injection molding grade, and the chlorine content is 67-68%.

The functional modifier used in the following examples of the present invention was an impact modifier VCE resin produced by Wuxi Honghui New Material science and technology Co.

The petroleum resin used in the following examples of the present invention was a C5 petroleum resin.

The stabilizer used in the following examples of the present invention was methyltin mercaptide YT-181.

The internal lubricant used in the following examples of the present invention was calcium stearate.

The external lubricant used in the following examples of the invention was a mixture of OPE wax and PE wax.

The impact modifier used in the following examples of the present invention was Shandongfeng MBS BL-126.

The high impact CPVC injection molded pipe fittings in the following examples of the invention were prepared according to the following steps:

(1) adding the raw materials into a hot mixing pot of a high-low speed mixing unit according to the formula amount, heating and mixing at a high speed, wherein the mixing speed is 900-1000r/min, raising the temperature of the hot mixing pot to 110-120 ℃ within 10-12 min, and then putting the hot mixing pot into a cold mixing pot, stirring and cooling to room temperature to obtain the CPVC dry mixed material;

(2) extruding and granulating the dry mixture through a double-screw extruder to obtain CPVC granules;

(3) and (3) preparing the CPVC granules by an injection molding machine to obtain the injection molding pipe fitting.

In the following examples of the present invention, the screw extrusion granulation process parameters are: the feeding speed of the double-screw extruder is 25 rpm; the rotating speed of the double-screw extruder is 30 rpm; the temperature of the double-screw extruder is controlled by zones, the temperature of the first zone is 172-plus-178 ℃, the temperature of the second zone is 185-plus-190 ℃, the temperature of the third zone is 190-plus-195 ℃, the temperature of the fourth zone is 193-plus-198 ℃, the traction speed is 1-2m/min, the water-cooling granulation is adopted in a granulation mode, and the particle length is controlled to be about 4 mm.

In the following embodiments of the present invention, the sample preparation process parameters of the injection molding machine are as follows: the temperature of a charging barrel of the injection molding machine is controlled in a partitioning mode, wherein the temperature of a first area is 170-175 ℃, the temperature of a second area is 172-175 ℃, the temperature of a third area is 175-180 ℃, the temperature of a fourth area is 180-185 ℃, and the temperature of a nozzle is 190-195 ℃; the back pressure is 0-5 bar; the mold closing time of the injection molding machine is 1-3 s; injecting the CPVC melt in a molten state into a mould through a nozzle, wherein the injection speed is 55-80% of the maximum speed, and the injection pressure is 50-70 bar; the pressure maintaining pressure is 55-60bar, and the pressure maintaining time is 2-5 s; the cooling time is 2-5 s; opening the mold for 1-4 s; the demolding time is 1-3 s.

Example 1

The high-impact CPVC injection molding pipe fitting comprises the following components in parts by weight:

CPVC resin 100 parts

1 part of functional modifier

0.1 part of petroleum resin

3.5 parts of stabilizer

1 part of internal lubricant

2 portions of external lubricant

6 portions of impact modifier

Inorganic filler 5 parts

0.3 part of pigment.

Example 2

The high-impact CPVC injection molding pipe fitting comprises the following components in parts by weight:

CPVC resin 100 parts

3 portions of functional modifier

0.5 part of petroleum resin

3 portions of stabilizer

2 portions of internal lubricant

External lubricant 3.0 parts

10 portions of impact modifier

Inorganic filler 7 parts

0.3 part of pigment.

Example 3

The high-impact CPVC injection molding pipe fitting comprises the following components in parts by weight:

CPVC resin 100 parts

1.5 parts of functional modifier

0.2 part of petroleum resin

3.2 parts of stabilizer

1.2 parts of internal lubricant

External lubricant 1.5 parts

Impact modifier 7 parts

Inorganic filler 5 parts

0.6 part of pigment.

Example 4

The high-impact CPVC injection molding pipe fitting comprises the following components in parts by weight:

CPVC resin 100 parts

2 portions of functional modifier

0.3 part of petroleum resin

3.5 parts of stabilizer

1.6 parts of internal lubricant

2.4 parts of external lubricant

8 parts of impact modifier

3 portions of inorganic filler

0.3 part of pigment.

Example 5

The high-impact CPVC injection molding pipe fitting comprises the following components in parts by weight:

CPVC resin 100 parts

3 portions of functional modifier

0.5 part of petroleum resin

4 portions of stabilizer

1.8 parts of internal lubricant

2.7 parts of external lubricant

9 parts of impact modifier

6 portions of inorganic filler

0.5 part of pigment.

Example 6

The high-impact CPVC injection molding pipe fitting comprises the following components in parts by weight:

CPVC resin 100 parts

1 part of functional modifier

0.3 part of petroleum resin

3.5 parts of stabilizer

1 part of internal lubricant

2 portions of external lubricant

6 portions of impact modifier

Inorganic filler 5 parts

0.3 part of pigment.

Example 7

The high-impact CPVC injection molding pipe fitting comprises the following components in parts by weight:

CPVC resin 100 parts

1 part of functional modifier

0.5 part of petroleum resin

3.5 parts of stabilizer

1 part of internal lubricant

2 portions of external lubricant

6 portions of impact modifier

Inorganic filler 5 parts

0.3 part of pigment.

Comparative example 1 the same as example 1 except that no petroleum resin was added in comparative example 1.

Comparative example 2 is the same as example 1 except that comparative example 2 employs impact modifier CPE instead of santoprene MBS BL-126.

Comparative example 3 the same as example 1 except that comparative example 3 used a processing aid ACR instead of the functional modifier VCE resin.

And (3) performance testing:

vicat softening temperature and impact properties of the high impact CPVC injection molded pipe obtained in examples 1-7 and comparative examples 1-2 and their rheological torque were tested, wherein:

the Vicat softening temperature was tested according to the standard GB/T8802-2001;

the notch impact performance of the cantilever beam is tested according to the standard GB/T1843-2008;

the drop hammer impact performance is tested according to the standard GB/T14153-2002;

the rheological torque was measured using a rheometer set at 185 deg.C, torque 30rpm, and charge 57 g.

Specific test results are shown in table 1:

TABLE 1

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.