阅读说明：本技术 一种丝滑绒面沙发家具用聚氨酯合成革及其制备方法 (Polyurethane synthetic leather for silky suede sofa furniture and preparation method thereof ) 是由 王森 王燕武 黄万里 宋远周 戴俊 王锐林 于 2020-11-04 设计创作，主要内容包括：本发明公开了一种丝滑绒面沙发家具用聚氨酯合成革及其制备方法,所述聚氨酯合成革由上而下依次包括聚氨酯面层、中间层、粘合层和基布层；所述聚氨酯面层由聚氨酯浆料涂覆在绒感离型纸表面后干燥制成,所述聚氨酯浆料由以下组分按重量份制备而成：聚碳树脂100份,溶剂70-90份,有机硅油5-6份,密胺类固化剂4-5份,促进剂0.15-0.2份,色浆15-18份。本发明生产的聚氨酯合成革表面细嫩丝滑,手感柔软,具有真皮绒面效果；本发明采用全干式法生产聚氨酯合成革,一次成型,生产简单高效,制备周期短。此外,本发明生产的丝滑绒面沙发家具用聚氨酯合成革相对真皮成本低,生态环保。(The invention discloses a polyurethane synthetic leather for silky suede sofa furniture and a preparation method thereof, wherein the polyurethane synthetic leather sequentially comprises a polyurethane surface layer, a middle layer, a bonding layer and a base cloth layer from top to bottom; the polyurethane surface layer is prepared by coating polyurethane slurry on the surface of the velvet release paper and then drying the velvet release paper, wherein the polyurethane slurry is prepared from the following components in parts by weight: 100 parts of polycarbonate resin, 70-90 parts of solvent, 5-6 parts of organic silicone oil, 4-5 parts of melamine curing agent, 0.15-0.2 part of accelerator and 15-18 parts of color paste. The polyurethane synthetic leather produced by the invention has the advantages of delicate and smooth surface, soft hand feeling and real leather suede effect; the invention adopts the full dry method to produce the polyurethane synthetic leather, and has one-step molding, simple and efficient production and short preparation period. In addition, compared with real leather, the polyurethane synthetic leather for the silky suede sofa furniture produced by the invention has low cost and is ecological and environment-friendly.)

1. The utility model provides a smooth matte polyurethane synthetic leather for sofa furniture which characterized in that: the polyurethane surface layer, the middle layer, the bonding layer and the base cloth layer are sequentially arranged from top to bottom; the polyurethane surface layer is prepared by coating polyurethane slurry on the surface of the velvet release paper and then drying the velvet release paper, wherein the polyurethane slurry is prepared from the following components in parts by weight:

2. the polyurethane synthetic leather for silky suede sofa furniture according to claim 1, wherein: the middle layer is made of middle layer slurry, and the middle layer slurry is prepared from the following components in parts by weight:

3. the polyurethane synthetic leather for silky suede sofa furniture according to claim 1, wherein: the adhesive layer is made of adhesive layer slurry, and the adhesive layer slurry is prepared from the following components in parts by weight:

4. the polyurethane synthetic leather for silky suede sofa furniture according to claim 3, wherein: the viscosity regulator is butanone.

5. The method of preparing the polyurethane leather for silky suede sofa furniture according to any one of claims 1 to 4, wherein the method comprises the following steps: the method comprises the following steps:

(1) uniformly coating a layer of polyurethane slurry on the surface of the velvet release paper, and drying to obtain a surface layer;

(2) coating a layer of intermediate layer slurry on the surface of the surface layer, and drying to obtain an intermediate layer;

(3) and coating a layer of adhesive layer slurry on the surface of the middle layer, drying to be in a semi-dry state, attaching the adhesive layer slurry to the base cloth, continuously drying and curing, and stripping the release paper to obtain a finished product, namely the polyurethane synthetic leather for the silky suede sofa furniture.

6. The method of claim 5, wherein: in the step (1), the drying temperature is 120-130 ℃, and the drying time is 3-5 min.

7. The method of claim 5, wherein: in the step (2), the drying temperature is 125-135 ℃, and the drying time is 5-6 min.

8. The method of claim 5, wherein: in the step (3), the drying temperature is 90-100 ℃, and the drying time is 1-2 min; the temperature for drying and curing is 120-130 ℃, and the time is 5-6 min.

Technical Field

The invention belongs to the technical field of polyurethane synthetic leather manufacturing, and particularly relates to polyurethane synthetic leather for silky suede sofa furniture and a preparation method thereof.

Background

Along with the continuous improvement of living standard, people have higher and higher requirements on the comfort of sofa furniture materials. The natural leather velvet product has the advantages of fine and comfortable leather surface, soft and plump hand feeling, good sanitary performance and the like, but has high price, poorer production environment, no compliance with the national environmental protection requirement, increasingly scarce raw materials and increasingly higher manufacturing cost; although the physical and mechanical properties of the pile-feeling polyurethane synthetic leather in the traditional process are superior to those of natural leather, the finished product has poor surface touch, rough leather surface, insufficient silkiness and tenderness, poor texture and insufficient fullness of hand feeling.

Under the situation, the polyurethane synthetic leather material with silky suede touch, soft and plump hand feeling and strong skin-friendly feeling is researched and developed so as to meet the high-level living requirements of customers at will.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a polyurethane synthetic leather for silky suede sofa furniture, which sequentially comprises a polyurethane surface layer, a middle layer, a bonding layer and a base cloth layer from top to bottom; the polyurethane surface layer is prepared by coating polyurethane slurry on the surface of the velvet release paper and then drying the velvet release paper, wherein the polyurethane slurry is prepared from the following components in parts by weight:

the preparation method of the polyurethane slurry comprises the following steps: adding the polycarbon resin and the solvent into a reaction kettle according to the proportion, and stirring at a constant speed to obtain a kettle material; then sequentially adding the organic silicon oil, the accelerant and the color paste according to the proportion, stirring at a high speed, and fully mixing to obtain slurry to be reacted; finally, melamine curing agents are added according to the proportion, and the polyurethane slurry can be obtained after full stirring.

Wherein: the polycarbon resin and the melamine curing agent in the slurry to be reacted are at high temperatureUnder the condition, alkoxy (N-CH) mainly containing functional group can be formed₂OR), hydroxymethylene (> N-CH)₂OH), (amino-NH)₂) Imino (> NH), melamine-melamine ether linkage > N-CH₂OCH₂Melamine resin with N < N. These functional groups, under the action of an accelerator (which provides an acidic environment), can undergo the following self-crosslinking reaction:

＞N-CH₂OH+＞NH→＞NCH₂N＜+H₂O

＞N-CH₂OH+HOCH₂N＜→＞N-CH₂OCH₂N＜+H₂O

＞N-CH₂OH+HOCH₂N＜→＞NCH₂N＜+HCHO+H₂O

the reaction can be continuously carried out under an acidic condition, so that a stable and compact carbon chain structure is formed on the leather surface. The structure can provide smooth touch and stable physical and mechanical properties.

Further, the middle layer is made of middle layer slurry, and the middle layer slurry is prepared from the following components in parts by weight:

further, the bonding layer is made of bonding layer slurry, and the bonding layer slurry is prepared from the following components in parts by weight:

the viscosity regulator is butanone.

The invention also aims to provide a preparation method of the polyurethane synthetic leather for the silky suede sofa furniture, which comprises the following steps:

(1) uniformly coating a layer of polyurethane slurry on the surface of the velvet release paper, and drying to obtain a surface layer; further, the drying temperature is 120-130 ℃, and the drying time is 3-5 min.

(2) Coating a layer of intermediate layer slurry on the surface of the surface layer, and drying to obtain an intermediate layer; further, the drying temperature is 125-135 ℃, and the drying time is 5-6 min.

(3) And coating a layer of adhesive layer slurry on the surface of the middle layer, drying to be in a semi-dry state, attaching the adhesive layer slurry to the base cloth, continuously drying and curing, and stripping the release paper to obtain a finished product, namely the polyurethane synthetic leather for the silky suede sofa furniture. Further, the drying temperature is 90-100 ℃, and the drying time is 1-2 min; the temperature for drying and curing is 120-130 ℃, and the time is 5-6 min.

Compared with the prior art, the invention has the beneficial effects that:

1. the polyurethane slurry for preparing the polyurethane surface layer is prepared by the crosslinking reaction of the polycarbon resin and the melamine curing agent, and the reaction can form a stable and compact carbon chain structure, so that the product has smooth touch and stable physical and mechanical properties; in addition, the organic silicon oil is added in the formula, so that the silky smooth effect is more obvious.

2. According to the invention, the polyurethane slurry is coated on the surface of the velvet-feeling release paper, and after the velvet-feeling release paper is peeled, the surface of the product can form a ground leather pattern, so that the product is soft in hand feeling and has a velvet surface effect;

3. the preparation method of the traditional synthetic leather product comprises the steps of processing base cloth by a wet polyurethane material (by a DMF replacement method) to prepare wet base cloth, and preparing the required synthetic leather by a dry process (by a release paper transfer film method); the steps in the invention are all release paper transfer film dry process technology, the wet polyurethane treatment is not carried out, the one-step forming is carried out, the production is simple and efficient, the preparation period is short, the cost is low, and the obtained synthetic leather product has good physical and mechanical properties.

3. Compared with real leather, the silky suede furniture leather hand produced by the invention has low cost and is ecological and environment-friendly.

Detailed Description

The present invention will be further described with reference to the following examples. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The types and suppliers of reagents used in this example were as follows:

the manufacturer of the polycarbonate resin is a New polyurethane Material Co-Fei Anli company, and the model is LT-8045; the organic silicone oil is produced by Dongguan Tianyu chemical Co., Ltd, and the model is PMX-200; the manufacturer of the melamine curing agent is Suzhou Shengju chemical industry Co., Ltd, and the model is JT-75; the promoter is produced by Suzhou Shengju chemical Co., Ltd, and the model is JF-320; the production factory of the polyether resin is Hefei anli polyurethane new material company Limited, and the model is ST-8630; the manufacturer of the leveling agent is Germany Bike company, and the model is BYK-9565; the manufacturer of the wear-resistant additive is German Bike company, and the model is BYK-3238; the polyol manufacturer is a BASF polyurethane specialty (china) ltd, model number BASF a; the production factory of the inhibition type catalyst is Hefei anli polyurethane new material company Limited, and the model is AL-C01; the isocyanate manufacturer is a special product of BASF polyurethane (China) and the model is BASF B; the manufacturers of the microfiber base fabrics are Shanghai Huafeng microfiber science and technology Co.

The reagents are provided only for illustrating the sources and components of the reagents used in the experiments of the present invention, so as to be fully disclosed, and do not indicate that the present invention cannot be realized by using other reagents of the same type or other reagents supplied by other suppliers.

Example 1

(1) Selecting velvet-feeling release paper with the code number of H-969 produced by Wenzhou Honghou and science and technology Limited, uniformly coating polyurethane surface layer slurry on the surface of the velvet-feeling release paper, drying in an oven at 130 ℃ for 4min, and drying to obtain a surface layer; the scanning gram weight of the surface layer is 140 g/square meter.

The polyurethane surface layer slurry is prepared from the following components in parts by weight:

the preparation method of the polyurethane slurry comprises the following steps: adding the polycarbonate resin LT-8045 and a solvent Dimethylformamide (DMF) into a reaction kettle in proportion, and stirring at a constant speed to obtain a kettle material; then sequentially adding the organic silicon oil PMX-200, the accelerant JF-320 and the color paste according to the proportion, stirring at a high speed, and fully mixing to obtain slurry to be reacted; and finally adding a polyamine curing agent JT-75 according to a ratio, and fully stirring to obtain the polyurethane surface layer slurry. The preparation of the top coat slurry in the subsequent examples was the same as that described herein, except that the components were used in different amounts.

(2) Uniformly coating the surface layer obtained in the step (1) with middle layer slurry, then drying in an oven at 130 ℃ for 5min, and drying to obtain a middle layer; the scanning gram weight of the middle layer is 160 g/square meter.

The middle layer slurry is prepared from the following components in parts by weight:

(3) uniformly coating the surface of the intermediate layer obtained in the step (2) with bonding layer slurry, transferring the intermediate layer to a 90 ℃ oven, drying for 1min to obtain a semi-dry state, attaching microfiber base cloth, transferring to a 120 ℃ oven, curing at a high temperature for 6min, and peeling from release paper to obtain a finished product; wherein the adhesive layer has a grammage of 240 g/square meter.

The bonding layer slurry is prepared from the following components in parts by weight: .

Example 2

(1) Selecting pile-feeling release paper with the code of Mei498, which is produced by SAPPI release paper company of America, uniformly coating polyurethane surface layer slurry on the surface of the pile-feeling release paper, drying in an oven at the temperature of 130 ℃ for 4.5min, and drying to obtain a surface layer; the scanning gram weight of the surface layer is 160 g/square meter.

The polyurethane surface layer slurry is prepared from the following components in parts by weight:

(2) uniformly coating the surface layer obtained in the step (1) with intermediate layer slurry, then drying in an oven at 130 ℃ for 6min, and taking the dried intermediate layer as an intermediate layer; the scanning gram weight of the middle layer is 180 g/square meter.

The middle layer slurry is prepared from the following components in parts by weight:

(3) uniformly coating adhesive layer slurry on the surface of the intermediate layer obtained in the step (2), drying the coated slurry in a 100 ℃ oven for 1.5min to be in a semi-dry state, attaching microfiber base cloth, curing at high temperature in a 130 ℃ oven for 6min, and stripping from release paper to obtain a finished product; wherein the adhesive layer has a scanning grammage of 260 grams per square meter.

The bonding layer slurry is prepared from the following components in parts by weight:

the polyurethane synthetic leather for the silky suede sofa furniture produced by the embodiment is tender and soft, has good skin-friendly feeling, and is ecological and environment-friendly; in addition, the physical and mechanical properties of the Weishibo are that the Weishibo can resist abrasion for 10 ten thousand times without breakage; the requirements of constant temperature and humidity of 70 ℃ and 95% humidity and no pulverization and cracking of the leather surface around 7 are met.

Description of the drawings: the 'tender and soft skin-friendly feeling' is subjectively felt by direct contact of skin and cannot be detected by an instrument temporarily.

Comparative example:

(1) selecting velvet-feeling release paper with the code number of H-969 produced by Wenzhou Honghou and science and technology Limited, uniformly coating polyurethane surface layer slurry on the surface of the velvet-feeling release paper, drying in an oven at 130 ℃ for 4.5min, and drying to obtain a surface layer; the scanning gram weight of the surface layer is 160 g/square meter.

The polyurethane surface layer slurry is prepared from the following components in parts by weight:

(2) uniformly coating the surface layer obtained in the step (1) with intermediate layer slurry, then drying in an oven at 130 ℃ for 6min, and taking the dried intermediate layer as an intermediate layer; the scanning gram weight of the middle layer is 180 g/square meter.

The middle layer slurry is prepared from the following components in parts by weight:

(3) uniformly coating adhesive layer slurry on the surface of the intermediate layer obtained in the step (2), drying the coated slurry in a 100 ℃ oven for 1.5min to be in a semi-dry state, attaching microfiber base cloth, curing at high temperature in a 130 ℃ oven for 6min, and stripping from release paper to obtain a finished product; wherein the adhesive layer has a scanning grammage of 260 grams per square meter.

The bonding layer slurry is prepared from the following components in parts by weight:

in the comparative example, the polyurethane surface layer slurry cannot generate self-crosslinking reaction, and a compact polyurethane coating cannot be formed, so that the obtained synthetic leather has rough and non-smooth surface, poor skin feel and poor mechanical properties.

The above embodiments are not limited to the scope of the present invention, and all modifications or variations based on the basic idea of the present invention are included in the scope of the present invention.