阅读说明：本技术 一种cpvc消防管及其制备方法 (CPVC fire hose and preparation method thereof ) 是由 孙立坤 陈建溢 姚宏华 时劲松 项梁 于 2021-08-18 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CPVC消防管及其制备方法。在CPVC树脂配方体系中添加丙烯酸酯类加工助剂ACR,会导致CPVC在加工过程中扭矩较高,还会导致CPVC消防管的维卡软化点降低。基于上述问题,本发明提供一种CPVC消防管,其成分中含有自制的助加工改性剂,所述助加工改性剂采用氯乙烯、偏二氯乙烯和叔碳酸乙烯酯作为原料共聚获得,助加工改性剂分子结构中的氯乙烯、偏二氯乙烯链结构与CPVC具有良好的相容性,对提高CPVC消防管综合性能十分有利。(The invention relates to the technical field of high polymer materials, in particular to a CPVC fire hose and a preparation method thereof. The addition of the acrylate processing aid ACR to the CPVC resin formulation system results in higher torque of the CPVC during processing and also results in a decrease in the Vicat softening point of the CPVC fire hose. Based on the problems, the CPVC fire-fighting pipe provided by the invention contains a self-made processing modifier, the processing modifier is obtained by copolymerizing vinyl chloride, vinylidene chloride and vinyl versatate serving as raw materials, and a vinyl chloride and vinylidene chloride chain structure in a molecular structure of the processing modifier has good compatibility with CPVC, so that the CPVC fire-fighting pipe is very favorable for improving the comprehensive performance of the CPVC fire-fighting pipe.)

1. The CPVC fire hose is characterized by comprising the following components in parts by weight:

2. a CPVC fire hose according to claim 1, wherein said CPVC resin powder is an extrusion grade CPVC resin.

3. A CPVC fire hose according to claim 1, wherein said thermal stabilizer is tin methyl mercaptide.

4. A CPVC fire hose according to claim 1, wherein said lubricant is a mixture of OPE wax, stearic acid and PE wax.

5. The CPVC fire hose of claim 1, wherein the processing aid modifier is prepared by the following steps in parts by weight:

(1) sequentially adding 3.5-10.5 parts of vinyl versatate, 0.2-0.6 part of initiator, 75-97.5 parts of deionized water and 1.5-3.75 parts of dispersant into a reaction kettle, vacuumizing, adding 24.5-35.7 parts of vinyl chloride into the reaction kettle when the vacuum degree reaches 0.09MPa, and stirring for 1-1.5 hours to uniformly disperse the materials;

(2) adding 25-32.5 parts of deionized water, 0.5-1.25 parts of dispersing agent, 19.6-29.75 parts of vinyl chloride and 7-10.5 parts of vinylidene chloride into a stirring and dispersing kettle, and stirring for 1-2 hours to obtain a fully dispersed monomer dispersion liquid;

(3) heating the reaction kettle in the step (1) to 58-68 ℃, starting a reaction in the reaction kettle, continuously and uniformly adding the monomer dispersion liquid prepared in the step (2) within 2-3h when the pressure in the reaction kettle is reduced by 0.25MPa, and stripping the reaction kettle to recover unreacted chloroethylene in the system when the pressure in the reaction kettle is reduced to be below 0.3 MPa;

(4) and (3) pouring out the materials in the reaction kettle, sequentially performing dehydration, rinsing, centrifugation and drying treatment, and screening the dried materials by using a 40-mesh screen to obtain the processing-aid modifier.

6. A CPVC fire hose according to claim 5, wherein said initiator is a mixture of azobisisobutyronitrile and t-butyl peroxypivalate in a weight ratio of 3: 2.

7. A CPVC fire hose according to claim 5, wherein the dispersant is a mixture of polyvinyl alcohol KH-20, hydroxypropyl methylcellulose E50, polyvinyl alcohol LL-02 in a weight ratio of 3:1: 2.

8. A CPVC fire hose according to any one of claims 1 to 7, wherein the process for its preparation comprises the following steps:

(1) weighing CPVC, a heat stabilizer, a lubricant, an impact modifier and a processing aid modifier according to the formula ratio, placing the CPVC, the heat stabilizer, the lubricant, the impact modifier and the processing aid modifier in a high-speed mixer, uniformly mixing to obtain a mixed material, heating the mixed material from room temperature to 125-130 ℃ through self friction within 10-15min, then cooling to 45-50 ℃, and placing for 18h to obtain a pretreated material;

(2) and adding the pretreated material into a conical double-screw extruder for melt extrusion, carrying out vacuum shaping and water temperature cooling on the extruded material at the temperature of below 18 ℃, and then drawing at the speed of 2-3m/min to obtain the CPVC fire fighting pipe.

9. A CPVC fire hose according to claim 8, wherein: the conical double-screw extruder comprises the following technological parameters: the feeding speed of the double-screw extruder is 25 rpm; the rotating speed of the double-screw extruder is 35 rpm; the double-screw extruder adopts zone temperature control, wherein the temperature of the first zone is 170-.

Technical Field

The invention relates to the technical field of high polymer materials, in particular to a CPVC fire hose and a preparation method thereof.

Background

In recent years, plastic pipes have been developed unprecedentedly, in favor of the explosive development of real estate and the need for old community transformation. Among them, CPVC fire hose is favored by people because of its characteristics of flame retardance, heat resistance, chemical corrosion resistance, bacteriostasis, and long life, and its usage amount is getting larger and larger.

The CPVC fire-fighting pipe has high requirements on the processing performance, the heat resistance, the flame retardant performance and the impact resistance. In order to improve the processability of the CPVC fire fighting pipe, an acrylate processing aid ACR is added into a CPVC resin formula system, and the processing aid ACR can cause higher torque of the CPVC during processing during use, and can also cause reduction of vicat softening point and flame retardant performance of the CPVC fire fighting pipe.

In the face of the continuously growing CPVC industry, the processing modifier with good processing performance, high Vicat softening point and excellent flame retardant property is obtained, so that the commercial significance is very strong.

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 processing aid ACR to the CPVC resin formulation system results in higher torque of the CPVC during processing and also results in a decrease in the Vicat softening point of the CPVC fire hose.

The technical scheme adopted by the invention for solving the technical problems is as follows: the invention provides a CPVC fire hose which comprises the following components in parts by weight:

specifically, the CPVC resin powder is an extrusion grade CPVC resin.

Specifically, the heat stabilizer is methyl tin mercaptide.

In particular, the lubricant is a mixture consisting of OPE wax, stearic acid and PE wax.

Specifically, the processing aid modifier is prepared by the following steps in parts by weight:

(1) sequentially adding 3.5-10.5 parts of vinyl versatate, 0.2-0.6 part of initiator, 75-97.5 parts of deionized water and 1.5-3.75 parts of dispersant into a reaction kettle, vacuumizing, adding 24.5-35.7 parts of vinyl chloride into the reaction kettle when the vacuum degree reaches 0.09MPa, and stirring for 1-1.5 hours to uniformly disperse the materials;

(2) adding 25-32.5 parts of deionized water, 0.5-1.25 parts of dispersing agent, 19.6-29.75 parts of vinyl chloride and 7-10.5 parts of vinylidene chloride into a stirring and dispersing kettle, and stirring for 1-2 hours to obtain a fully dispersed monomer dispersion liquid;

(3) heating the reaction kettle in the step (1) to 58-68 ℃, starting a reaction in the reaction kettle, continuously and uniformly adding the monomer dispersion liquid prepared in the step (2) within 2-3h when the pressure in the reaction kettle is reduced by 0.25MPa, and stripping the reaction kettle to recover unreacted chloroethylene in the system when the pressure in the reaction kettle is reduced to be below 0.3 MPa;

(4) and (3) pouring out the materials in the reaction kettle, sequentially performing dehydration, rinsing, centrifugation and drying treatment, and screening the dried materials by using a 40-mesh screen to obtain the processing aid modifier.

Specifically, the initiator is a mixture of azobisisobutyronitrile and tert-butyl peroxypivalate in a weight ratio of 3: 2.

Specifically, the dispersing agent is a mixture of polyvinyl alcohol KH-20, hydroxypropyl methyl cellulose E50 and polyvinyl alcohol LL-02 according to a weight ratio of 3:1: 2.

Specifically, the CPVC fire hose is characterized in that the preparation process comprises the following steps:

(1) weighing CPVC, a heat stabilizer, a lubricant, an impact modifier and a processing modifier according to the formula ratio, uniformly mixing to obtain a mixed material, heating the mixed material from room temperature to 125-130 ℃ through self friction within 10-15min, then cooling to 45-50 ℃, and standing for 18h to obtain a pretreated material;

(2) and adding the pretreated material into a conical double-screw extruder for melt extrusion, carrying out vacuum shaping and water temperature cooling on the extruded material at the temperature of below 18 ℃, and then drawing at the speed of 2-3m/min to obtain the CPVC fire fighting pipe.

Specifically, the process parameters of the conical double-screw extruder are as follows: the feeding speed of the double-screw extruder is 25 rpm; the rotating speed of the double-screw extruder is 35 rpm; the double-screw extruder adopts zone temperature control, wherein the temperature of the first zone is 170-.

The invention has the beneficial effects that:

(1) the invention provides a CPVC fire fighting pipe, which comprises a self-made processing modifier, wherein the processing modifier is obtained by copolymerizing vinyl chloride, vinylidene chloride and vinyl versatate serving as raw materials, and a vinyl chloride and vinylidene chloride chain structure in a molecular structure of the processing modifier has good compatibility with CPVC, so that the CPVC fire fighting pipe is very favorable for improving the comprehensive performance;

(2) the processing-assistant modifier contains vinylidene chloride and vinyl versatate structures with low glass transition temperature in the molecular structure, has better plasticizing effect in CPVC, can effectively improve the processing performance of the CPVC fire-fighting pipe and reduce the processing load;

(3) in the preparation process of the CPVC fire fighting pipe, the methyl tin mercaptide is used as a heat stabilizer, so that the CPVC fire fighting pipe has a better heat stabilization effect;

(4) the CPVC fire fighting pipe disclosed by the invention successfully solves the problems of high processing torque, lower oxygen index and Vicat softening point and poor impact resistance of the conventional CPVC fire fighting pipe by reasonably designing the components of the CPVC fire fighting pipe, and has a better market prospect.

Detailed Description

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

The CPVC resin powder used in the following examples of the invention is extrusion grade CPVC resin.

The impact modifier MBS employed in the following examples of the invention is Japanese Brillouin MBS B564.

The heat stabilizer used in the following examples of the present invention was tin methyl mercaptide.

The lubricant used in the following examples of the present invention was a mixture of OPE wax, stearic acid and PE wax.

The processing-aid modifier adopted in the following examples is prepared by the following steps in parts by weight:

(1) sequentially adding 3.5-10.5 parts of vinyl versatate, 0.2-0.6 part of initiator, 75-97.5 parts of deionized water and 1.5-3.75 parts of dispersant into a reaction kettle, vacuumizing, adding 24.5-35.7 parts of vinyl chloride into the reaction kettle when the vacuum degree reaches 0.09MPa, and stirring for 1-1.5 hours to uniformly disperse the materials;

(2) adding 25-32.5 parts of deionized water, 0.5-1.25 parts of dispersing agent, 19.6-29.75 parts of vinyl chloride and 7-10.5 parts of vinylidene chloride into a stirring and dispersing kettle, and stirring for 1-2 hours to obtain a fully dispersed monomer dispersion liquid;

(3) heating the reaction kettle in the step (1) to 58-68 ℃, starting a reaction in the reaction kettle, continuously and uniformly adding the monomer dispersion liquid prepared in the step (2) within 2-3h when the pressure in the reaction kettle is reduced by 0.25MPa, and stripping the reaction kettle to recover unreacted chloroethylene in the system when the pressure in the reaction kettle is reduced to be below 0.3 MPa;

(4) and (3) pouring out the materials in the reaction kettle, sequentially performing dehydration, rinsing, centrifugation and drying treatment, and screening the dried materials by using a 40-mesh screen to obtain the processing aid modifier.

The initiator used in the following examples of the invention was a mixture of azobisisobutyronitrile and t-butyl peroxypivalate in a weight ratio of 3: 2.

The dispersant used in the following examples of the present invention is a mixture of polyvinyl alcohol KH-20, hydroxypropyl methylcellulose E50, and polyvinyl alcohol LL-02 at a weight ratio of 3:1: 2.

The CPVC fire fighting pipe adopted in the following embodiments of the invention is prepared according to the following steps:

(1) weighing CPVC, a heat stabilizer, a lubricant, an impact modifier and a processing modifier according to the formula ratio, uniformly mixing to obtain a mixed material, heating the mixed material from room temperature to 125-130 ℃ through self friction within 10-15min, then cooling to 45-50 ℃, and standing for 18h to obtain a pretreated material;

(2) adding the pretreated materials into a conical double-screw extruder for melt extrusion, wherein the feeding speed of the double-screw extruder is 25 rpm; the rotating speed of the double-screw extruder is 35 rpm; the double-screw extruder adopts zone temperature control, the temperature of the first zone is 170-plus-175 ℃, the temperature of the second zone is 190-plus-195 ℃, the temperature of the third zone is 193-plus-198 ℃, the temperature of the fourth zone is 190-plus-195 ℃, the extruded materials are subjected to vacuum forming and water temperature cooling below 18 ℃, and then are drawn at the speed of 2-3m/min, so that the CPVC fire-fighting pipe is obtained.

Example 1

The CPVC fire hose comprises the following components in parts by weight:

during the preparation process of the CPVC fire fighting pipe, the mixed material is heated to 125 ℃ from room temperature through self friction within 10min, and then is cooled to 45 ℃.

The conical double-screw extruder adopts zone temperature control, wherein the temperature of a first zone is 170 ℃, the temperature of a second zone is 190 ℃, the temperature of a third zone is 193 ℃, and the temperature of a fourth zone is 190 ℃.

The drawing speed of the material after being extruded from the conical double-screw extruder is 2 m/min.

Example 2

The CPVC fire hose comprises the following components in parts by weight:

during the preparation process of the CPVC fire fighting pipe, the mixed material is heated to 128 ℃ from room temperature through self friction within 12min, and then is cooled to 48 ℃.

The conical double-screw extruder adopts zone temperature control, wherein the temperature of a first zone is 172 ℃, the temperature of a second zone is 193 ℃, the temperature of a third zone is 195 ℃, and the temperature of a fourth zone is 192 ℃.

The drawing speed of the material after being extruded from the conical twin-screw extruder is 2.5 m/min.

Example 3

The CPVC fire hose comprises the following components in parts by weight:

during the preparation process of the CPVC fire fighting pipe, the mixed material is heated to 130 ℃ from room temperature through self friction within 15min, and then is cooled to 50 ℃.

The conical double-screw extruder adopts zone temperature control, wherein the temperature of a first zone is 175 ℃, the temperature of a second zone is 195 ℃, the temperature of a third zone is 198 ℃, and the temperature of a fourth zone is 195 ℃.

The drawing speed of the material after being extruded from the conical double-screw extruder is 3 m/min.

Example 4

The CPVC fire hose comprises the following components in parts by weight:

during the preparation process of the CPVC fire fighting pipe, the mixed material is heated to 125 ℃ from room temperature through self friction within 12min, and then is cooled to 45 ℃.

The conical double-screw extruder adopts zone temperature control, wherein the temperature of a first zone is 170 ℃, the temperature of a second zone is 190 ℃, the temperature of a third zone is 193 ℃, and the temperature of a fourth zone is 190 ℃.

The drawing speed of the material after being extruded from the conical double-screw extruder is 2 m/min.

Example 5

The CPVC fire hose comprises the following components in parts by weight:

during the preparation process of the CPVC fire fighting pipe, the mixed material is heated to 125 ℃ from room temperature through self friction within 10min, and then is cooled to 45 ℃.

The conical double-screw extruder adopts zone temperature control, wherein the temperature of a first zone is 170 ℃, the temperature of a second zone is 190 ℃, the temperature of a third zone is 193 ℃, and the temperature of a fourth zone is 190 ℃.

The drawing speed of the material after being extruded from the conical twin-screw extruder is 2.5 m/min.

Example 6

The CPVC fire hose comprises the following components in parts by weight:

during the preparation process of the CPVC fire fighting pipe, the mixed material is heated to 125 ℃ from room temperature through self friction within 10min, and then is cooled to 45 ℃.

The conical double-screw extruder adopts zone temperature control, wherein the temperature of a first zone is 175 ℃, the temperature of a second zone is 195 ℃, the temperature of a third zone is 198 ℃, and the temperature of a fourth zone is 195 ℃.

The drawing speed of the material after being extruded from the conical double-screw extruder is 2 m/min.

Comparative example 1 the same as example 1 except that the CPVC fire hose of comparative example 1 comprises the following ingredients in parts by weight:

comparative example 2 the same as example 1 except that the CPVC fire hose of comparative example 2 comprises the following ingredients in parts by weight:

comparative example 3 the same as example 1 except that in comparative example 3, the processing aid modifier does not have step (2) in the preparation process, the reaction starts to occur in the reaction kettle when the temperature of the reaction kettle in step (1) is raised to 58-68 ℃, and the components in step (2) are directly added into the reaction kettle when the pressure in the reaction kettle is reduced by 0.25 MPa.

Comparative example 4 the same as example 1 except that the heat stabilizer used in comparative example 4 was octyl tin mercaptide.

Comparative example 5 the same as example 1 except that the dispersant in comparative example 5 was a mixture of polyvinyl alcohol KH-20, hydroxypropylmethylcellulose E50, polyvinyl alcohol LL-02 at a weight ratio of 1:1: 2.

Comparative example 6 the same as example 1 except that the dispersant in comparative example 6 was a mixture of polyvinyl alcohol KH-20, hydroxypropyl methylcellulose E50, polyvinyl alcohol LL-02 at a weight ratio of 3:1: 1.

And (3) performance testing:

the CPVC fire fighting pipes obtained in examples 1-6 and comparative examples 1-6 are tested for relevant performances according to GB/T5135.19-2010, and the 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.