CN113429707A

CN113429707A - Polyvinyl chloride resin composition with improved paint fineness

Info

Publication number: CN113429707A
Application number: CN202110869370.9A
Authority: CN
Inventors: 郑皓
Original assignee: Shanghai Chlor Alkali Chemical Co Ltd
Current assignee: Shanghai Chlor Alkali Chemical Co Ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2021-09-24
Anticipated expiration: 2041-07-30
Also published as: CN113429707B

Abstract

Disclosed is a polyvinyl chloride resin composition having improved paint smoothness, which comprises 100 parts by weight of a matte polyvinyl chloride resin, 3-5 parts by weight of an impact modifier, 2-4 parts by weight of a processing aid and 5-10 parts by weight of a thermoplastic elastomer.

Description

Polyvinyl chloride resin composition with improved paint fineness

Technical Field

The present invention relates to a polyvinyl chloride resin composition. The compositions of the invention give moldings with improved paint fineness.

Background

The polyvinyl chloride resin is a general resin with good comprehensive performance, flame retardance, wide application and relatively low price. In recent years, the popularity of PVC resins has been moving to higher performance, specialization, and engineering. The fields of automobiles, building materials, clothes, packaging, furniture, information and the like require that the surface of a PVC plastic product has low gloss and has a delustering effect.

At present, the model market is developing very rapidly in China, and PVC is one of the main materials for making models. However, high-end models generally use PU resin instead of PVC. The reason is that when the surface of the PVC product is painted, the coating formed by painting is not fine enough, the product is rough, and the texture of the model cannot be finely restored. The main disadvantage of PU resins is that the processability is not comparable to that of PVC, and because most molded articles are profiled bars, extremely high processability is required.

Therefore, there is a need in the art to provide a resin composition for making a mold, which has both the paint smoothness of a PU resin and the processability of a PVC resin.

Disclosure of Invention

An object of the present invention is to provide a resin composition for use in the manufacture of a mold, which has both the smoothness of the paint coating of PU resin and the processability of PVC resin.

Accordingly, one aspect of the present invention relates to a resin composition comprising:

another aspect of the present invention relates to the use of the above resin composition for the manufacture of molded articles.

In still another aspect, the present invention relates to a molded article comprising a white mold formed from the above-mentioned resin composition of the present invention and a coating layer on the surface of the white mold.

Drawings

The invention is further described with reference to the accompanying drawings, in which:

FIG. 1 is a photograph of a PVC model painted surface according to an embodiment of the present invention;

FIG. 2 is a photograph of a PVC model painted surface according to another embodiment of the present invention;

FIG. 3 is a photograph of a conventional PVC model painted surface;

FIG. 4 is a photograph of a PU model painted surface.

Detailed Description

In the field, the matting resin generally refers to a resin with obviously atomized and low gloss on the surface after film forming, and is used for coating various substrates, so that the gloss of a coating can be reduced, and the plastic feeling caused by excessive gloss of the coating is eliminated. The idea design is to synthesize large-particle-size dispersion particles which are not easy to deform, in the film forming process, the particles are mutually fused and assembled to form a continuous rough surface, and the diffuse reflection of an adhesive film is increased to obtain the extinction performance (https:// www.sohu.com/a/339858862_ 120330628).

The inventors of the present invention have found that although a matte polyvinyl chloride resin forms a continuous rough surface after molding, a painted finish has a fine appearance if it is used for a molded article. Therefore, the molded product formed by the delustered polyvinyl chloride can overcome the defect of rough paint surface of the conventional polyvinyl chloride molded product and retain the processability of the polyvinyl chloride. The present invention has been completed based on this finding.

Therefore, the resin composition of the present invention comprises 100 parts by weight of the matte polyvinyl chloride resin. The matte polyvinyl chloride suitable for use in the resin composition of the present invention is not particularly limited and may be prepared by a method known in the art or may be commercially available. For example, it is available from japan koilou corporation under the trade name of K10S.

The resin composition of the present invention further comprises 3 to 5 parts by weight of an impact modifier, 2 to 4 parts by weight of a processing aid and 5 to 10 parts by weight of a thermoplastic elastomer, based on 100 parts by weight of the matte polyvinyl chloride resin.

The impact modifier suitable for use in the resin composition of the present invention is not particularly limited, and may be a conventional impact modifier known in the art. In one embodiment of the present invention, the impact modifier is MBS, which is known by the chemical name methylmethacrylate/butadiene/styrene terpolymer.

The processing aids suitable for use in the resin composition of the present invention are selected from the group of ACR processing aids, which are conventional processing aids known in the art, typically prepared by graft copolymerization of methyl methacrylate with methacrylates and acrylates (see, for example, "the action and development of ACR processing aids" in the shin-hai forest, volume 31, phase 10, 2005, 5 months). In one example of the present invention, ACR processing aids such as PA20, PA40, P60, and the like, from the japanese brillouin company may be used.

The thermoplastic elastomer suitable for the resin composition of the present invention is not particularly limited, and may be a conventional thermoplastic elastomer, and for example, it may be selected from thermoplastic elastomers such as styrenes (SBS, SIS, SEBS, SEPS), olefins (TP0, TPV), dienes (TPB, TPI), vinyl chlorides (TPVC, TCPE), urethanes (TPU), esters (TPEE), amides (TPEE), organofluorine (TPF), silicones, and vinyls. In one example of the invention, the thermoplastic elastomer is selected from dupont TPE 3548.

The resin composition of the present invention may optionally further comprise other components to further improve the properties of the molded product, and the optional components include, for example, a heat stabilizer, a lubricant, titanium dioxide, calcium carbonate, a plasticizer and the like.

In one embodiment of the present invention, the resin composition of the present invention comprises:

in one embodiment of the present invention, the heat stabilizer is an organotin stabilizer, and a commercial product may be used; the lubricant is pe wax or ope wax with the melting point of 60-105 ℃; the titanium dioxide is rutile type or anatase type titanium dioxide; the calcium carbonate is light or heavy calcium carbonate; the plasticizer is dioctyl phthalate, and can be freely selected from commercial products.

The resin composition of the present invention can be prepared by the following method:

(1) mixing delustered polyvinyl chloride resin, an impact modifier, an ACR processing aid and an optional heat stabilizer, a lubricant, titanium dioxide and calcium carbonate in a mixer, heating to 50-70 ℃, preferably 55-65 ℃, more preferably 60 ℃, then optionally adding all plasticizers, heating to 80-95 ℃, preferably 83-93 ℃, more preferably 85-90 ℃, adding a thermoplastic elastomer, heating to 110-125 ℃, preferably 115-120 ℃, cooling to below 45 ℃, preferably below 40 ℃, more preferably below 35 ℃, uniformly mixing, and discharging to obtain a mixture;

(2) and (3) extruding and granulating the mixture to obtain the granular material containing the extinction polyvinyl chloride resin for preparing the high-end model. The processing temperature is 140-160 ℃, preferably 142-155 ℃, more preferably 145-150 ℃;

(3) and obtaining the high-end model white mold by adopting an injection molding mode for the granules, wherein the processing temperature is 150-170 ℃, preferably 152-165 ℃, more preferably 154-160 ℃, and preferably 155-158 ℃.

The inventor of the invention finds that in the injection molding process, the hand feeling of the product is related to the injection molding temperature, and the product can be molded at relatively low temperature on the premise of ensuring plasticization, so that the product has better hand feeling. Accordingly, one of ordinary skill in the art, after reading this disclosure, can readily select a suitable injection molding temperature from the temperature range of 150 ℃ and 170 ℃.

According to the invention, through adjusting the stabilizer and the lubricant and adding the thermoplastic elastomer, the plasticization of the material is effectively improved, the fluidity is improved, and the glossiness is increased, so that the prepared model white mold has preliminary extinction capability, the model has more delicate hand feeling, and is more suitable for coloring.

The present invention will be further described with reference to specific examples, but the following examples are only preferred embodiments of the present invention, and are not intended to be exhaustive.

Examples

1. White mould coloring method

Firstly mixing the French paint and the diluent in a ratio of 1:1, then manually smearing the mixture on the surface of a white mould by using an oil painting brush, and naturally drying the mixture.

Example 1

The formula is as follows: (weight)

Mixing delustering polyvinyl chloride resin, a heat stabilizer, a lubricant, an impact modifier, titanium dioxide, a processing aid and calcium carbonate in a mixer, heating to 60 ℃, adding all plasticizers, heating to about 88 ℃, adding a thermoplastic elastomer, heating to about 118 ℃, cooling to below 45 ℃, uniformly mixing, and discharging to obtain a mixture.

And (3) extruding and granulating the mixture by adopting an extrusion granulation mode (the processing temperature is about 155 ℃, the type of the extruder is a small conical twin-screw extruder SJZ20/40 developed by Wuhan Hongyang, and the screw rotating speed is 35-45rpm) to obtain the granules containing the extinction polyvinyl chloride resin.

And preparing the granules into a white mold by adopting an injection molding mode (an injection molding machine is Ningbo Haitian SA2500), wherein the processing temperature is 158 ℃. The photo of the painted surface of the white mould painted by the method is shown in figure 1, and is basically consistent with the PU painted surface and has exquisite hand feeling.

The prepared product is tested according to the national standard GB/T26701-2011, and all indexes of the prepared product reach the national standard. The hand and texture test results are shown in table 1.

Example 2

The formula is as follows: (weight)

Mixing delustering polyvinyl chloride resin, a heat stabilizer, a lubricant, an impact modifier, titanium dioxide, a processing aid and calcium carbonate in a mixer, heating to 60 ℃, adding all plasticizers, heating to about 88 ℃, adding a thermoplastic elastomer, heating to about 118 ℃, cooling to below 45 ℃, uniformly mixing, and discharging to obtain a mixture;

and (3) extruding and granulating the mixture to obtain the granular material containing the extinction polyvinyl chloride resin for preparing the high-end model. The processing temperature was about 148 ℃.

And (3) performing injection molding on the granules to obtain a high-end model white mold, wherein the processing temperature is about 158 ℃. The picture of the painted surface of the white mould painted by the method is shown in figure 2, and the picture is basically consistent with the PU painted surface and has fine hand feeling.

The test is carried out according to the national standard GB/T26701-2011, and all indexes of the prepared product reach the national standard. The hand and texture test results are shown in table 1.

Comparative example 1

The same procedure as in example 1 was followed except that the ordinary 1000-grade PVC resin was used instead of the matte PVC resin. The method comprises the following specific steps:

the formula is as follows: (weight)

The photo of the painted surface of the prepared white mold painted by the method is shown in figure 3, and has a certain difference with the PU painted surface, and texture can not be seen.

Comparative example 2

Comparative example 2A commercially available PU model was used for direct comparison. The photograph of the PU model finish is shown in FIG. 4, and the test results of the hand feeling and texture are shown in Table 1.

Table 1: test results of hand feeling and texture

As is apparent from the above test results, the use of the matted polyvinyl chloride resin contributes to the formation of a paint finish having a frosty feel and a clear texture, and a resin composition having both the paint fineness of the PU resin and the processability of the PVC resin is obtained. Although it is known that matting polyvinyl chloride resins can themselves be obtained by synthesizing large-sized and non-deformable dispersion particles which fuse together to form a continuous rough surface during film formation, increasing the diffuse reflection of the film, it has been found that such matting resins can improve the paint finish feel surprisingly or unexpectedly.

Claims

1. A resin composition comprising:

2. the resin composition of claim 1, comprising:

。

3. the resin composition according to claim 1 or 2, wherein said ACR processing aid is selected from the group consisting of type ACR processing aids available from the japanese bell and moon company PA20, PA40, P60.

4. The resin composition according to claim 1 or 2, wherein the thermoplastic elastomer is selected from the group consisting of styrenic, olefinic, diene, vinyl chloride, urethane, ester, amide, organofluorine, silicone and vinyl thermoplastic elastomers.

5. The resin composition according to claim 4, wherein the thermoplastic elastomer is selected from ester thermoplastic elastomers.

6. Use of the resin composition according to any one of claims 1 to 5 for the manufacture of a moulded article.

7. A molded article comprising a white mold formed from the resin composition as claimed in any one of claims 1 to 5 and a coating layer on the surface of the white mold.