CN109181148B

CN109181148B - Nano-modified PVC composite foam material and preparation method thereof

Info

Publication number: CN109181148B
Application number: CN201810846865.8A
Authority: CN
Inventors: 杜崇铭
Original assignee: Changzhou Aiten New Material Technology Co ltd
Current assignee: Changzhou aiten New Material Technology Co.,Ltd.
Priority date: 2018-07-27
Filing date: 2018-07-27
Publication date: 2021-02-12
Anticipated expiration: 2038-07-27
Also published as: CN109181148A

Abstract

The invention discloses a nano modified PVC composite foaming material which comprises the following raw materials in parts by weight: 80-100 parts of polyvinyl chloride resin; 10-25 parts of chopped glass fiber; 2-12 parts of a composite nano modifier; 0.4-6 parts of a foaming agent; 1-6 parts of a lubricant; 1-5 parts of a stabilizer; 0.5-1.2 parts of processing aid. The PVC composite foaming material prepared by the invention has the characteristics of high strength, good toughness, excellent processability and the like, solves the technical problems of insufficient strength, insufficient toughness and poor processability of the existing PVC material, and can be widely applied to the fields of high-speed rails, automotive upholsteries, daily necessities, household building materials, packaging, advertisement decoration and the like.

Description

Nano-modified PVC composite foam material and preparation method thereof

Technical Field

The invention relates to the technical field of modification of high polymer materials, in particular to a nano modified PVC composite foaming material and a preparation method thereof.

Background

Polyvinyl chloride (PVC) resin is a polar non-crystalline high polymer, and the product has good physical properties and chemical properties, and can be widely applied to the fields of industry, buildings, agriculture, daily necessities and the like. At present, furniture building material products taking PVC resin as a main raw material become the second largest pillar of the plastic industry of China, and the annual speed is increased by more than 15%. The PVC composite material has the advantages of low cost, excellent performance and recyclability, and conforms to the great trend of environmental sustainable development and circular economy.

Due to the excellent performance and environmental protection of the PVC material, the PVC material is widely applied to the building material household field, is generally used for manufacturing PVC composite foaming plates, has generally replaced ceramic tiles and wood plates at home and abroad, and becomes the first choice of building material household decoration materials. However, as the quality of life of people is improved, the performance requirements on the PVC sheet are higher and higher, and the performance of the traditional PVC material does not meet the requirements of people on high-quality products. Although the PVC foaming material has the characteristics of water resistance, flame retardance, acid and alkali resistance, moth prevention, heat preservation, light weight, sound insulation, shock absorption and the like, the PVC foaming material has the following defects: such as insufficient strength, insufficient toughness, poor processability, and inability to meet outdoor conditions.

Therefore, a PVC composite foaming material with low cost, high strength, good toughness and good processability is needed to meet the performance requirements of people on PVC materials, so as to improve the comprehensive performance of PVC materials and widen the application field of materials.

Disclosure of Invention

The invention aims to solve the technical problems of insufficient strength, insufficient toughness and poor processability of the existing PVC material.

The technical scheme of the invention is as follows:

a nano modified PVC composite foaming material comprises the following raw materials in parts by weight:

80-100 parts of polyvinyl chloride resin;

10-25 parts of chopped glass fiber;

2-12 parts of a composite nano modifier;

0.4-6 parts of a foaming agent;

1-6 parts of a lubricant;

1-5 parts of a stabilizer;

0.5-1.2 parts of processing aid.

Further, the polyvinyl chloride resin is a PVC resin with the polymerization degree of 800-3000, the polymerization degree is an important parameter influencing the PVC resin, and the compression permanent deformation of the PVC resin is reduced along with the increase of the polymerization degree, the rebound resilience is increased, the heat-resistant deformation performance is improved, the hardness, the tensile strength, the wear resistance, the aging resistance and the tear resistance are increased, but the processing performance of the product is weakened after a certain polymerization degree is reached, so that the two aspects are considered, therefore, the PVC resin with the polymerization degree of 800-3000 is preferably selected, and the comprehensive performance and the processing performance of the material in the range are optimal.

Further, the chopped glass fiber is chopped glass fiber with the diameter of 50-80 mm.

Further, the composite nano modifier is a mixture of organic modified montmorillonite and nano titanium dioxide, and the weight ratio is as follows: 1: 0.8-1.2. The preparation method of the composite nano modifier comprises the following steps: (1) adding montmorillonite and nanometer titanium dioxide into a mixing container according to the weight ratio of 1:0.8-1.2, adding a proper amount of water, and mixing to prepare a suspension; (2) heating the suspension to 70-80 ℃, adding sodium alkyl benzene sulfonate as a surfactant in sequence, stirring uniformly, and filtering to obtain a precipitate, thereby obtaining the composite nano modifier. The modified polyvinyl chloride fiber is added into a PVC material, so that the polarity and the bonding property of polyvinyl chloride are changed, the bonding property of polyvinyl chloride resin and chopped glass fiber can be greatly improved, and the impact strength, the bending strength and the tensile strength of the modified material are obviously improved.

Further, the foaming agent is one or a mixture of more of azodicarbonamide, barium azodicarboxylate, dinitrosopentamethylenetetramine, carbamide, p-methylsulfonamide, 2 '-azobisisobutyronitrile, 4' -oxybis-benzenesulfonylhydrazide or sodium bicarbonate.

Further, the lubricant is one or a mixture of more of metal soap salt, oxidized polyethylene wax, stearate, stearic acid, polyethylene wax, paraffin or chlorinated paraffin.

Further, the stabilizer is one or a mixture of several of organic tin heat stabilizers, fatty acid salt heat stabilizers or rare earth stabilizers.

Further, the processing aid is one or a mixture of acrylic copolymer and styrene copolymer.

The preparation method comprises the steps of firstly adding PVC and various functional additives into a high-speed mixer to mix for 30 minutes, then adding the composite nano modifier to mix for 15 minutes at a high speed, then sending into a double-screw extruder to melt and mix at the temperature of 130-.

The invention has the beneficial effects that:

1. the invention particularly selects the nano composite modifier, changes the polarity and the bonding property of the PVC resin, can greatly improve the bonding property of the PVC resin and the chopped glass fiber, and obviously improves the impact strength, the bending strength and the tensile strength of the modified material.

2. The optimized matching use of various components can exert the mechanical property of the nano modified PVC composite foaming material to the maximum extent, so that the material has good toughness, strength and processability.

3. The PVC composite foaming material is easy to process and can be processed into parts with different specifications according to different requirements.

Detailed Description

In order to facilitate understanding for those skilled in the art, the present invention will be described in further detail below with reference to examples:

the compositional formula of each example is shown in table 1.

Table 1: weight composition formula of each example

Formulation composition	Example 1	Example 2	Example 3	Example 4	Example 5
						PVC resin	80	85	90	95	100
Short glass fiber	10	12	15	22	25
						Composite nano modifier	2	4	7	10	12
Foaming agent	0.4	1	2	4	6
						Lubricant agent	1	2.2	3.1	4.3	6
Stabilizer	1	1.7	2.5	3.6	5
						Processing aid	0.5	0.7	0.8	1	1.2

The polymerization degrees of the polyvinyl chloride resins of examples 1 to 5 were 800, 1350, 1950, 2500, and 3000, respectively.

The glass staple fibers of examples 1-5 had lengths of 50mm, 58mm, 65mm, 70mm, 80mm, respectively;

the blowing agent of example 1 was azodimethylamide; the blowing agent of example 2 was a mixture of barium azodicarboxylate and dinitrosopentamethylenetetramine (weight ratio 1: 1); the blowing agent of example 3 was a mixture of carbamide, p-methylsulfonamide and 2, 2' -azobisisobutyronitrile (weight ratio 1:1: 1); the foaming agent in example 4 is a mixture of azodicarbonamide, 4' -oxybis-benzenesulfonylhydrazide and sodium bicarbonate (weight ratio 1:0.5: 1); the blowing agent of example 5 was a mixture of azodimethylamide, barium azodicarboxylate, dinitrosopentamethylenetetramine, carbonamide and p-methylsulfonamide (weight ratio 1:0.5:0.5:0.5:1: 0.5);

the lubricant of example 1 is a metal soap salt; the lubricant of example 2 was a mixture of a metal soap salt and an oxidized polyethylene wax (1: 1 by weight); the lubricant of the embodiment 3 is a mixture of metal soap salt, oxidized polyethylene wax and stearate (the weight ratio is 1:1: 1); the lubricant of example 4 is a mixture of metal soap salt, oxidized polyethylene wax, stearate and stearic acid (weight ratio 1:1: 1: 1); the lubricant of example 5 is a mixture of stearic acid, polyethylene wax, paraffin wax and chlorinated paraffin wax (weight ratio 1:1: 1: 1);

the stabilizer of example 1 is an organotin-based heat stabilizer; the stabilizer of example 2 is a fatty acid based heat stabilizer; the stabilizer of example 3 was a mixture of a fatty acid salt-based heat stabilizer and a rare earth stabilizer (weight ratio 1: 1); the stabilizer of example 4 is a mixture of an organotin heat stabilizer, a fatty acid heat stabilizer and a fatty acid salt heat stabilizer (weight ratio 1:1: 1); the stabilizer of example 5 was a mixture of an organotin heat stabilizer, a fatty acid salt heat stabilizer and a rare earth stabilizer (weight ratio 1:1: 1: 1);

the processing aid of example 1 was an acrylate copolymer; the processing aid of the embodiment 2 is a mixture of an acrylate copolymer and a styrene copolymer (the weight ratio is 1: 1); the processing aid of example 3 was a styrenic copolymer; the processing aid of example 4 is a mixture of an acrylate copolymer and a styrene copolymer (weight ratio 0.5: 1); the processing aid of example 4 was a mixture of an acrylate copolymer and a styrenic copolymer (weight ratio 2: 3).

Adding PVC and various functional additives into a high-speed mixer according to the proportion, mixing for 30 minutes, adding the composite nano modifier, mixing for 15 minutes at a high speed, and then sending into a double-screw extruder, melting and mixing the obtained melt in the examples 1-5 at 130 ℃, 140 ℃, 150 ℃, 160 ℃ and 170 ℃, cooling the obtained melt by a water tank after the obtained melt is extruded by the double-screw extruder, and introducing the melt into a granulating device for granulating to obtain the nano modified PVC composite foaming material.

The performance test of the PVC composite foam material obtained in each example of the present invention was performed, and the results are shown in table 2:

TABLE 2 Performance test data for the examples

Properties of	Method of producing a composite material	Unit of	Example 1	Example 2	Example 3	Example 4	Example 5
								Tensile strength	ASTM D638	Mpa	24.1	26.3	28.5	27.3	27.6
Bending strength	ASTM D790	Mpa	61.2	63.5	70.1	66.5	68.5
								Flexural modulus	ASTM D790	Mpa	2855	2922	3015	2865	2946
Notched Izod impact Strength at ambient temperature (23 ℃ C.) (1/8')	ASTM D256	KJ/M²	7.5	8.1	9.2	8.5	8.8

The foregoing is a detailed description of the invention, which is described in greater detail and not intended to limit the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications are possible without departing from the inventive concept, and such obvious alternatives fall within the scope of the invention.

Claims

1. A nanometer modified PVC composite foaming material is characterized in that: the raw materials comprise the following components in parts by weight:

90 parts of polyvinyl chloride resin;

15 parts of chopped glass fiber;

7 parts of a composite nano modifier;

2 parts of a foaming agent;

3.1 parts of a lubricant;

2.5 parts of a stabilizer;

0.8 part of processing aid;

wherein the polyvinyl chloride resin is PVC resin with the polymerization degree of 1950;

the length of the chopped glass fiber is 65 mm;

the composite nano modifier is prepared by the following preparation method:

adding montmorillonite and nanometer titanium dioxide into a mixing container according to the weight ratio of 1:0.8-1.2, adding a proper amount of water, and mixing to prepare a suspension;

heating the suspension to 70-80 ℃, sequentially adding sodium alkyl benzene sulfonate as a surfactant, uniformly stirring, and filtering to obtain a precipitate, thereby obtaining the composite nano modifier;

the foaming agent is a mixture of carbamide, p-methylsulfonamide and 2, 2 '-azobisisobutyronitrile, and the weight ratio of the carbamide, the p-methylsulfonamide and the 2, 2' -azobisisobutyronitrile is 1:1: 1;

the lubricant is a mixture of metal soap salt, oxidized polyethylene wax and stearate, and the weight ratio of the metal soap salt to the oxidized polyethylene wax to the stearate is 1:1: 1;

the stabilizer is a mixture of a fatty acid salt heat stabilizer and a rare earth stabilizer, and the weight ratio of the fatty acid salt heat stabilizer to the rare earth stabilizer is 1: 1;

the processing aid is a styrene copolymer.