CN103030905A - High-strength and high-stability modified PVC and preparation method thereof - Google Patents

Abstract

The invention discloses high-strength and high-stability modified PVC (polyvinyl chloride) which comprises the following components in parts by weight: 100 parts of PVC resin, 20-55 parts of CPVC (chlorinated polyvinyl chloride) resin, 15-20 parts of phenolic antioxidant, 1-12 parts of titanium dioxide, 15-35 parts of plasticizer, 2-8 parts of stabilizer, 0-3 parts of colorant, and 2-10 parts of filling. The high-strength and high-stability modified PVC has the benefits that: the modified PVC has good mechanical property, high strength, good balance of stiffness and toughness, heat resistance, light resistance, corrosion resistance, and high stability; the service life of a product is ensured; in addition, the preparation method is good in repeatability; the process is controllable; the manufacturing cost is low; and the industrial large-scale application is facilitated.

Description

Modified PVC that a kind of high-strength height is steady and preparation method thereof

Technical field

The present invention relates to a kind of PVC of modification, have high strength and high stability, be particularly useful for the rubbing strip in the automobile manufacturing field, belong to polymeric material field.

Background technology

The PVC(polyvinyl chloride) material has better mechanical property, the advantage that fire-retardant, electric insulating quality is good, and the lower and easy processing of manufacturing cost, is widely used in producing the various fields such as plastics soft goods, pipeline, the packing of product.Development along with automotive industry, research finds that polyvinyl chloride is expected to be widely used in use as rubbing strip in the automobile making, but general PVC performance is difficult to satisfy the high strength of rubbing strip, the requirement of high stability, so, in the urgent need to PVC is carried out modification, make it have better mechanical property, have intensity high, the characteristics such as rigid-tough balance is good, and is heat-resisting, fast light, corrosion-resistant.

Summary of the invention

For solving the deficiencies in the prior art, the object of the invention is to overcome the defective of prior art, PVC of a kind of modification and preparation method thereof is provided, have high strength and high stability.

In order to realize above-mentioned target, the present invention adopts following technical scheme:

The steady modified PVC of a kind of high-strength height is comprised of by following weight part following composition:

100 parts of polyvinyl chloride (PVC) RESINS

Chlorinated polyvinyl chloride resin 20-55 part

Phenol antioxidant 15-20 part

Titanium dioxide 1-12 part

Softening agent 15-35 part

Stablizer 2-8 part

Tinting material 0-3 part

Filler 2-10 part

The mean polymerisation degree of aforementioned polyvinyl chloride (PVC) RESINS is 800-1500.

Chlorinity is 65%-70% in the aforementioned chlorinated polyvinyl chloride resin.

Aforementioned titanium dioxide is nano level, and its median size is 20-80nm.

Aforementioned phenol antioxidant is dihydroxyphenyl propane.

Aforementioned softening agent is a kind of in o-phthalic acid dibutyl ester, dibutyl phthalate, the triphenylphosphate.

Aforementioned tinting material is a kind of in carbon black, red iron oxide, the lemon yellow.

Aforementioned filler is calcium carbonate.

Aforementioned calcium carbonate is for having adopted titanate coupling agent to carry out surface-treated calcium carbonate.

Prepare the steady modified PVC of aforesaid a kind of high-strength height, comprise the steps:

S1, take by weighing each component according to weight ratio, in premixing machine, mix and be heated to 70-90 ℃, be incubated 15 minutes;

S2, the mixture of step S1 gained is added twin screw extruder, body temperature is 160 ℃, and district's temperature is 180 ℃, and two district's temperature are 200 ℃, and three district's temperature are 205 ℃, and engine speed is 20-35rpm;

S3, extrude the polyvinyl chloride resin of modification, cooling, through the tablets press pelletizing, minute grade packaged.

Usefulness of the present invention is: modified PVC of the present invention, have good mechanical property, and intensity is high, and rigid-tough balance is good, and is heat-resisting, fast light, corrosion-resistant, and stability is strong, has guaranteed the work-ing life of product.And preparation method's good reproducibility, process is controlled, and production cost is low, is convenient to large-scale industrialization and uses.

Embodiment

Carry out each composition of proportioning by the weight shown in the table 1.

Each composition weight of table 1 embodiment 1-4

Wherein, among the embodiment 1-4, the mean polymerisation degree of polyvinyl chloride (PVC) RESINS is 800-1500; Chlorinity is 65%-70% in the chlorinated polyvinyl chloride resin; The median size of nano titanium oxide is respectively 20nm, 40nm, 60nm, 80nm; Stablizer is organotin stabilizer.

Calcium carbonate surface-treated concrete grammar is: calcium carbonate is dropped in the mixing machine, be heated to 60 ℃ and be incubated appropriate time, then add titanate coupling agent in the mixing machine and mix, discharging is stand-by after 10-25 minute, note keeping calcium carbonate dry, prevent moisture absorption.

Preparation process is as follows: S1, take by weighing each component according to the weight of table 1, mix and be heated to 70-90 ℃ in premixing machine, be incubated 15 minutes;

S2, the mixture of step S1 gained is added twin screw extruder, body temperature is 160 ℃, and district's temperature is 180 ℃, and two district's temperature are 200 ℃, and three district's temperature are 205 ℃, and engine speed is 20-35rpm;

S3, extrude the polyvinyl chloride resin of modification, cooling, through the tablets press pelletizing, minute grade packaged.

The performance of the modified PVC that embodiment 1-4 prepares sees Table 2.

?	Embodiment 1	Embodiment 2	Embodiment 3	Embodiment 4	Comparative Examples
						Tensile strength/MPa	85	88	93	80	65
Shore hardness	A95 +5	A95 +5	A95 +5	A95 +5	A95 +5
						Elongation at break	360%	380%	355%	400%	260%
Colour fastness (the xenon irradiation is after 1000 hours)	〉=4.5 grades	〉=4.5 grades	〉=4.5 grades	〉=4.5 grades	＜4.5 grades
						Ageing-resistant performance (in the ageing oven 60 ℃, behind the 240h)	Without aging	Without aging	Without aging	Without aging	Have aging

The performance of each embodiment of table 2 and right, wherein, Comparative Examples is unmodified PVC.

This shows, through modifying character for PVC material, intensity is higher, and in the essentially identical situation of shore hardness, the PVC elongation at break of modification is longer, illustrates that its rigid-tough balance is better; And the colour fastness of the PVC of modification and ageing-resistant performance all obviously be better than unmodified PVC, and its weathering resistance and longer service life are described, the rubbing strip that can satisfy in the automotive field uses.

Above demonstration and described ultimate principle of the present invention, principal character and advantage.The technician of the industry should understand, and above-described embodiment does not limit the present invention in any form, and all employings are equal to replaces or technical scheme that the mode of equivalent transformation obtains, all drops in protection scope of the present invention.

Claims (10)

1. the modified PVC that high-strength height is steady is characterized in that, is comprised of by following weight part following composition:

100 parts of polyvinyl chloride (PVC) RESINS

Chlorinated polyvinyl chloride resin 20-55 part

Phenol antioxidant 15-20 part

Titanium dioxide 1-12 part

Softening agent 15-35 part

Stablizer 2-8 part

Tinting material 0-3 part

Filler 2-10 part.

2. the steady modified PVC of a kind of high-strength height according to claim 1 is characterized in that, the mean polymerisation degree of above-mentioned polyvinyl chloride (PVC) RESINS is 800-1500.

3. the steady modified PVC of a kind of high-strength height according to claim 1 is characterized in that, chlorinity is 65%-70% in the above-mentioned chlorinated polyvinyl chloride resin.

4. the steady modified PVC of a kind of high-strength height according to claim 1 is characterized in that, above-mentioned titanium dioxide is nano level, and its median size is 20-80nm.

5. the steady modified PVC of a kind of high-strength height according to claim 1 is characterized in that, above-mentioned phenol antioxidant is dihydroxyphenyl propane.

6. the steady modified PVC of a kind of high-strength height according to claim 1 is characterized in that, above-mentioned softening agent is a kind of in o-phthalic acid dibutyl ester, dibutyl phthalate, the triphenylphosphate.

7. the steady modified PVC of a kind of high-strength height according to claim 1 is characterized in that, above-mentioned tinting material is a kind of in carbon black, red iron oxide, the lemon yellow.

8. the steady modified PVC of a kind of high-strength height according to claim 1 is characterized in that, above-mentioned filler is calcium carbonate.

9. the steady modified PVC of a kind of high-strength height according to claim 8 is characterized in that, above-mentioned calcium carbonate is for having adopted titanate coupling agent to carry out surface-treated calcium carbonate.

10. the steady modified PVC of preparation claim each described a kind of high-strength height of 1-9 is characterized in that, comprises the steps:

S1, take by weighing each component according to weight ratio, in premixing machine, mix and be heated to 70-90 ℃, be incubated 15 minutes;

S2, the mixture of step S1 gained is added twin screw extruder, body temperature is 160 ℃, and district's temperature is 180 ℃, and two district's temperature are 200 ℃, and three district's temperature are 205 ℃, and engine speed is 20-35rpm;

S3, extrude the polyvinyl chloride resin of modification, cooling, through the tablets press pelletizing, minute grade packaged.