CN104817806A - Thermoplastic elastomer material for toy products - Google Patents

Abstract

The invention belongs to the technical field of rubber, and particularly relates to a thermoplastic elastomer material for toy products, which comprises the following components in percentage by mass: 40% -65% of styrene block copolymer; 15% -40% of paraffin oil; 10% -25% of puncture-resistant polyethylene; compared with the prior art, the thermoplastic elastomer prepared by the formula and the process has better transparency and better puncture resistance, thereby solving the problem that children or pets can swallow partial broken fragments due to breakage and breakage when biting the toy with teeth, and enhancing the durability of the toy.

Description

Thermoplastic elastomer materials for toy products

technical field

The invention belongs to the technical field of rubber, and in particular relates to a thermoplastic elastomer material for toy products.

Background technique

At present, transparent thermoplastic elastomer materials for children's toys and pet toys are produced on the market. Because the material strength and puncture resistance are not high enough, children or pets may break and break when biting the toys with their teeth and swallow some of the broken pieces. , toys are not durable.

In view of this, it is necessary to provide a thermoplastic elastomer material for toy products, which has the characteristics of high strength, good puncture resistance and transparency, so as to solve the problem of cracking and damage when children or pets bite toys with their teeth. Enhancing the durability of the toy in the event of ingestion of partially broken fragments.

Contents of the invention

The purpose of the present invention is: in order to overcome the strength and puncture resistance of the transparent thermoplastic elastomer material used for children and pet toys in the prior art is not high enough, and children or pets appear to be broken and damaged when biting the toy with their teeth In the case of swallowing some damaged fragments, a formula and process for a high-strength puncture-resistant transparent thermoplastic elastomer material for toy products is provided, which is used to produce high-strength puncture-resistant transparent thermoplastic elastomer materials for toy products to solve the problem When children or pets bite the toy with their teeth, it will be broken and damaged and some of the broken fragments will be swallowed, which will enhance the durability of the toy.

In order to achieve the above object, the present invention adopts the following technical solutions:

Thermoplastic elastomer materials for toy products, by mass percentage, its formula includes the following components:

Styrene block copolymer 40%-65%;

Paraffin oil 15%-40%;

Puncture-resistant polyethylene 10%-25%;

Among them, the styrene block copolymer has excellent mechanical properties, high strength, good elasticity, large elongation at break, small permanent deformation, and is non-toxic. Moreover, the styrene block copolymer itself is a kind of thermoplastic elastomer, which can be produced without vulcanization. Has excellent resilience. Paraffin oil has little odor, which can make the product have good initial color, heat resistance and light performance. Puncture-resistant polyethylene has strong puncture resistance, and the compounding of puncture-resistant polyethylene and styrene block copolymer can solve the problem of children or pets breaking and breaking when biting toys with their teeth and swallowing some damaged fragments, and The puncture-resistant polyethylene and styrene blocks have good compatibility, no need to add additional compatibilizers, and the transparency of the two is good.

Its preparation method comprises the following steps:

The first step, pre-filling with oil: add styrene block copolymer to paraffin oil at 70-100°C and stir for 0.5-4h, then place it for 12-96h for later use;

The second step, batching: add the pre-filled oil powder obtained in the first step to the mixture containing puncture-resistant polyethylene and a compatibilizer and stir for 10-60 minutes to obtain a mixture;

The third step, production: put the mixture obtained in the second step into a twin-screw extruder, plasticize and granulate at 200-280°C to obtain plastic granules;

The fourth step, dry packaging: dry the plastic granules obtained in the third step at 40-80°C for 0.3-3h, and pack.

As an improvement of the thermoplastic elastomer material for toy products of the present invention, its formula includes the following components in parts by weight:

Styrene block copolymer 45%-60%;

Paraffin oil 20%-35%;

Puncture resistant polyethylene 12%-20%.

As an improvement of the thermoplastic elastomer material for toy products of the present invention, its formula includes the following components in parts by weight:

Styrene block copolymer 58%;

Paraffin oil 25%;

Puncture Resistant Polyethylene 17%.

As an improvement of the thermoplastic elastomer material for toy products of the present invention, the styrene block copolymer includes styrene-butadiene-styrene triblock copolymer, styrene-isoprene-styrene triblock copolymer At least one of block copolymers and hydrogenated styrene-butadiene-styrene triblock copolymers. Among them, the hydrogenated styrene-butadiene-styrene triblock copolymer has better aging resistance.

As an improvement of the thermoplastic elastomer material for toy products of the present invention, the number average molecular weight of the styrene block copolymer is 100,000-250,000.

As an improvement of the thermoplastic elastomer material for toy products of the present invention, the puncture-resistant polyethylene is linear low-density polyethylene (LLDPE) and/or metallocene polyethylene (m-PE). Linear low-density polyethylene has good impact resistance, good elongation, good puncture resistance, good chemical stability, and high tensile strength. It can resist the corrosion of acid, alkali and salt solution at room temperature. Metallocene polyethylene has high molecular weight and narrow distribution, few and short branched chains, low density, high purity, high transparency, high tensile strength, good impact resistance, and good puncture resistance.

As an improvement of the thermoplastic elastomer material for toy products of the present invention, the number average molecular weight of the linear low density polyethylene is 50,000-100,000.

As an improvement of the thermoplastic elastomer material for toy products of the present invention, the number average molecular weight of the metallocene polyethylene is 100,000-150,000.

Compared with the prior art, the thermoplastic elastomer material for toy products in the present invention has a formula including styrene block copolymer, paraffin oil and puncture-resistant polyethylene, and the thermoplastic elastomer produced by using the formula and the above-mentioned process has high Elasticity, high strength, high resilience, aging resistance, oil resistance and other excellent properties, and environmental protection, non-toxic, safe, wide range of hardness, excellent coloring, soft touch, weather resistance, fatigue resistance and temperature resistance Excellent processing performance, no need for vulcanization, can effectively save energy, can be recycled to reduce costs, and can be processed by general thermoplastic molding machines without special processing equipment, low cost and high production efficiency. Moreover, the thermoplastic elastomer prepared by using this formula and the above-mentioned process has better transparency and better puncture resistance, which can solve the problem of children or pets swallowing some damaged fragments when they tear and bite toys with their teeth. case, enhance the durability of the toy.

In addition, the thermoplastic elastomer prepared by adopting the formula and the above-mentioned process is easy to recycle and reduce the cost. The waste generated during the production process (escaping burrs, extruding waste rubber) and the final waste products can be directly returned for reuse; used old products can be recycled after simple regeneration, reducing environmental pollution and expanding the source of renewable resources.

Moreover, all raw materials in the present invention are strictly screened to ensure the highest purity. Since there are no chemical reactions involved in processing, no reaction residues, decomposition by-products or other extractables are left in the finished TPE compound.

Detailed ways

The present invention and its beneficial effects will be described in detail below in conjunction with specific embodiments, but the specific embodiments of the present invention are not limited thereto.

Example 1

A thermoplastic elastomer material for toy products provided in this embodiment, its formula includes the following components in parts by weight:

Styrene-butadiene-styrene triblock copolymer 58%;

Paraffin oil 25%;

Linear low density polyethylene 17%.

Among them, the number average molecular weight of the styrene-butadiene-styrene triblock copolymer is 200,000, and the number average molecular weight of the linear low density polyethylene is 60,000.

Its preparation method comprises the following steps:

The first step, pre-filling with oil: add styrene-butadiene-styrene triblock copolymer into paraffin oil at 80°C and stir for 2 hours, then place it for 48 hours for later use;

The second step, batching: add the pre-filled oil powder obtained in the first step into the linear low-density polyethylene and stir for 30 minutes to obtain a mixture;

The third step, production: add the mixture obtained in the second step into a twin-screw extruder, plasticize and granulate at 240°C to obtain plastic granules;

The fourth step, dry packaging: dry the plastic granules obtained in the third step at 60°C for 1 hour, and then pack.

Example 2

A thermoplastic elastomer material for toy products provided in this embodiment, its formula includes the following components in parts by weight:

Styrene-isoprene-styrene triblock copolymer 55%;

Paraffin oil 30%;

Metallocene polyethylene 15%

Among them, the number average molecular weight of the styrene-butadiene-styrene triblock copolymer is 150,000, and the number average molecular weight of the metallocene polyethylene is 120,000.

Its preparation method comprises the following steps:

The first step, pre-filling with oil: add styrene-isoprene-styrene triblock copolymer into paraffin oil at 90°C and stir for 1 hour, then place it for 70 hours for later use;

The second step, ingredients: add the pre-filled oil powder obtained in the first step into metallocene polyethylene and stir for 40 minutes to obtain a mixture;

The third step, production: add the mixture obtained in the second step into a twin-screw extruder, plasticize and granulate at 260°C to obtain plastic granules;

The fourth step, dry packaging: dry the plastic granules obtained in the third step at 50°C for 2 hours, and then pack.

Example 3

A thermoplastic elastomer material for toy products provided in this embodiment, its formula includes the following components in parts by weight:

Hydrogenated styrene-butadiene-styrene triblock copolymer 53%;

Paraffin oil 35%;

Metallocene polyethylene 12%;

Among them, the number average molecular weight of the styrene-butadiene-styrene triblock copolymer is 120,000, and the number average molecular weight of the metallocene polyethylene is 140,000.

Its preparation method comprises the following steps:

The first step, pre-filling with oil: add hydrogenated styrene-butadiene-styrene triblock copolymer into paraffin oil at 85°C and stir for 3 hours, then place it for 15 hours for later use;

The second step, ingredients: add the pre-filled oil powder obtained in the first step into metallocene polyethylene and stir for 50 minutes to obtain a mixture;

The third step, production: add the mixture obtained in the second step into a twin-screw extruder, plasticize and granulate at 230°C to obtain plastic granules;

The fourth step, dry packaging: dry the plastic granules obtained in the third step at 30°C for 3 hours, and then pack.

Example 4

A thermoplastic elastomer material for toy products provided in this embodiment, its formula includes the following components in parts by weight:

Styrene-butadiene-styrene triblock copolymer 24%;

Styrene-isoprene-styrene triblock copolymer 24%;

Paraffin oil 32%;

Metallocene polyethylene 10%;

Linear low density polyethylene 10%;

Among them, the number average molecular weight of styrene-butadiene-styrene triblock copolymer is 180,000, the number average molecular weight of styrene-isoprene-styrene triblock copolymer is 230,000, and the metallocene poly The number average molecular weight of ethylene is 150,000, and the number average molecular weight of linear low density polyethylene is 90,000.

Its preparation method comprises the following steps:

The first step, pre-fill oil: add styrene-butadiene-styrene triblock copolymer and styrene-isoprene-styrene triblock copolymer into paraffin oil and stir for 3.5h at 95°C , and then put it aside for 20h;

The second step, batching: add the pre-filled oil powder obtained in the first step to the mixture of metallocene polyethylene and linear low-density polyethylene and stir for 35 minutes to obtain a mixture;

The third step, production: add the mixture obtained in the second step into a twin-screw extruder, plasticize and granulate at 260°C to obtain plastic granules;

The fourth step, dry packaging: dry the plastic granules obtained in the third step at 55°C for 1.5 hours, and then pack.

According to the disclosure and teaching of the above specification, those skilled in the art to which the present invention pertains can also make appropriate changes and modifications to the above embodiment. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims (8)

1. toy product thermoplastic elastic material, is characterized in that:

By mass percentage, its formula comprises following component:

Styrene block copolymer 40%-65%;

Paraffin oil 15%-40%;

Puncture polyethylene 10%-25%;

Its preparation method comprises the following steps:

The first step, pre-oiling: added in paraffin oil by styrene block copolymer at 70-100 DEG C and stir 0.5-4h, then places 12-96h for subsequent use;

Second step, batching: the preliminary filling oil-bound distemper the first step obtained adds in the mixture comprising puncture polyethylene and compatilizer and stirs 10-60 minute, obtains compound;

3rd step, produces: the compound obtained by second step adds in twin screw extruder, plastifies granulation, obtain plastic grains at 200-280 DEG C;

4th step, dry packing: plastic grains dry 0.3-3h at 40-80 DEG C that the 3rd step is obtained, packaging.

2. toy product thermoplastic elastic material according to claim 1, is characterized in that:

By weight, its formula comprises following component:

Styrene block copolymer 45%-60%;

Paraffin oil 20%-35%;

Puncture polyethylene 12%-20%.

3. toy product thermoplastic elastic material according to claim 2, is characterized in that:

By weight, its formula comprises following component:

Styrene block copolymer 58%;

Paraffin oil 25%;

Puncture polyethylene 17%.

4. the toy product thermoplastic elastic material according to any one of claims 1 to 3, is characterized in that: described styrene block copolymer comprises at least one in SBS, SIS and hydrogenated styrene-butadiene-styrene triblock copolymer.

5. toy product thermoplastic elastic material according to claim 4, is characterized in that: the number-average molecular weight of described styrene block copolymer is 100,000-25 ten thousand.

6. the toy product thermoplastic elastic material according to any one of claims 1 to 3, is characterized in that: described puncture polyethylene is LLDPE and/or metallocene PE.

7. toy product thermoplastic elastic material according to claim 6, is characterized in that: the number-average molecular weight of described LLDPE is 50,000-10 ten thousand.

8. toy product thermoplastic elastic material according to claim 6, is characterized in that: the number-average molecular weight of described metallocene PE is 100,000-15 ten thousand.