阅读说明：本技术 一种麦秆纸浆纤维-淀粉可降解复合薄膜及其制备方法 (A kind of straw paper pulp fiber-starch degradable laminated film and preparation method thereof ) 是由 陈夫山 王亚腾 宋晓明 吉喆 刘丹凤 于 2019-08-30 设计创作，主要内容包括：本发明提供一种麦秆纸浆纤维-淀粉可降解复合薄膜及其制备方法,麦秆纸浆纤维-淀粉可降解复合薄膜的原料包括以下质量份数的成分：麦秆纸浆纤维10-47份、淀粉30-57份、甘油23-33份。制备方法包括：将淀粉、麦秆纸浆纤维和甘油按照设定比例混合,并加水稀释,得到混合料液；对混合料液进行加热糊化,得到糊化料液；对糊化料液进行脱气；将脱气后的糊化料液成膜并烘干,得到麦秆纸浆纤维-淀粉可降解复合薄膜。该麦秆纸浆纤维-淀粉可降解复合薄膜及其制备方法,通过麦秆纸浆纤维与淀粉的复合提高复合薄膜的机械强度和耐水性,原料均可降解,价廉易得,制备工艺简单,无需添加其他化学试剂,减少环境污染。(The present invention provides a kind of straw paper pulp fiber-starch degradable laminated film and preparation method thereof, and straw paper pulp fiber-starch degradable laminated film raw material includes the ingredient of following mass fraction: 10-47 parts of straw paper pulp fiber, 30-57 parts of starch, 23-33 parts of glycerol.Preparation method includes: to mix starch, straw paper pulp fiber and glycerol according to setting ratio, and be diluted with water, and obtains mixed liquor；Heat Gelatinization is carried out to mixed liquor, obtains gelatinization feed liquid；Gelatinization feed liquid is de-gassed；Gelatinization feed liquid after degassing is formed a film and dried, straw paper pulp fiber-starch degradable laminated film is obtained.Straw paper pulp fiber-starch degradable the laminated film and preparation method thereof, by the mechanical strength and water resistance of straw paper pulp fiber and the compound raising laminated film of starch, raw material is degradable, it is cheap and easy to get, preparation process is simple, without adding other chemical reagent, reduces environmental pollution.)

1. a kind of straw paper pulp fiber-starch degradable laminated film, it is characterised in that: the straw paper pulp fiber-starch can The raw material of degradation laminated film includes the ingredient of following mass fraction: 10-47 parts of straw paper pulp fiber, 30-57 parts of starch, glycerol 23-33 parts.

2. straw paper pulp fiber-starch degradable laminated film according to claim 1, it is characterised in that: the starch For the mixing of one or more of potato starch, tapioca, cornstarch, wheaten starch and konjak starch.

3. straw paper pulp fiber-starch degradable laminated film according to claim 1, it is characterised in that: the straw Paper pulp fiber-starch degradable laminated film is with a thickness of 80-100 μm.

4. a kind of method for preparing straw paper pulp fiber-starch degradable laminated film a method according to any one of claims 1-3, It is characterized in that, comprising the following steps:

S1. the starch, the straw paper pulp fiber and the glycerol are mixed according to setting mass fraction, and are diluted with water, Obtain mixed liquor；

S2. Heat Gelatinization is carried out to the mixed liquor, obtains gelatinization feed liquid；

S3. the gelatinization feed liquid is de-gassed；

S4. the gelatinization feed liquid after the degassing is formed a film and is dried, obtain the straw paper pulp fiber-starch degradable THIN COMPOSITE Film.

5. according to claim 4 prepare straw paper pulp fiber-starch degradable laminated film method, feature exists In: the total mass concentration of starch and the straw paper pulp fiber described in the mixed liquor obtained after diluting in step S1 is 3%-5%.

6. according to claim 4 prepare straw paper pulp fiber-starch degradable laminated film method, feature exists In: the gelatinization point of Heat Gelatinization is 70-90 DEG C in step S2, gelatinization time 30-60min.

7. according to claim 4 prepare straw paper pulp fiber-starch degradable laminated film method, feature exists In: drying temperature is 70-100 DEG C in step S4.

8. according to claim 4 prepare straw paper pulp fiber-starch degradable laminated film method, feature exists In, further include being pre-processed before step S1 to the straw paper pulp fiber, it is described pretreatment the following steps are included:

S0. the straw paper pulp fiber is successively discongested, screened and is beaten, obtain pretreated straw paper pulp fiber.

9. according to claim 8 prepare straw paper pulp fiber-starch degradable laminated film method, feature exists In: the mass concentration of straw paper pulp fiber is 2%-5% when discongesting in step S0 to the straw paper pulp fiber；When discongesting Between be 5-10min.

10. according to claim 8 prepare straw paper pulp fiber-starch degradable laminated film method, feature exists In: straw paper pulp fiber of the granularity less than 0.15mm is filtered out in step S0 to be beaten.

Technical field

The invention belongs to degradable laminated film preparation technical fields, and in particular to a kind of straw paper pulp fiber-starch can Degradation laminated film and preparation method thereof.

Background technique

With the growth of population in the world and the continuous improvement of living standard, also day is increasingly for the pollution of environment by the mankind It is acute.Wherein, more prominent also more representative problem is exactly petroleum-based plastics film product pollution on the environment.Stone Oil belongs to non-renewable resources in itself, simultaneously as petroleum-based plastics film product is difficult to degrade under field conditions (factors), largely Petroleum-based plastics film product accumulates in the natural environment after being dropped, and causes serious destruction to ecological environment.

In order to alleviate pollution of the petroleum-based plastics product to environment, people start to pay attention to the exploitation of degradation material.Currently, More commonly used degradation material mainly includes polylactic acid (PLA), polyhydroxyalkanoate (PHA), polyvinyl alcohol (PVA), gathers Caproic acid lactone (PCL), thermoplastic starch (TPS) etc..Wherein, starch is a kind of natural macromolecular material common in life, is come Source is extensive, cheap, and is easily degraded, and is the excellent raw material for preparing degradable film material.But due to starch molecule In contain more hydroxyl, hydrophily is stronger, and the water-resistance and water resistance of starch material are all very poor, and mechanical performance and heat Stability is also poor, limits the application and development of starch degradable thin-film material.

In order to solve the problems, such as that starch material mechanical performance and water repelling property are poor, many researchers are all thin in starch It is studied and has been explored in terms of the improvement of film.Chinese patent literature CN109354722A discloses a kind of modified nano fiber altogether The preparation method of element enhancing thermoplastic starch composite food package film, using tapioca as substrate, glycerol makees plasticiser, using changing Property after nano-cellulose enhance starch film, although the food packaging film strength obtained, water resistance is improved.This Outside, existing degradable film material also pass through the nano materials such as nano clay, polylactic acid PLA, low density polyethylene and High molecular material improves, and resulting composite material film all has excellent mechanical performance and water-resistance, but Nanowire Most higher costs such as element, nano clay, polylactic acid PLA are tieed up, and low density polyethylene belongs to non-degradable material, and The preparation process very complicated of entire composite material film also relates to various other chemical reagent in technique, easily causes environment Pollution.

Summary of the invention

The technical problem to be solved by the present invention is to provide a kind of straw paper pulp fiber-starch degradable laminated film and its preparations Method, by the mechanical strength and water resistance of straw paper pulp fiber and the compound raising laminated film of starch, and straw paper pulp is fine Dimension belongs to degradation material, from a wealth of sources, cheap and easy to get, and preparation process is simple, does not need to add other chemical reagent again, It not will cause environmental pollution.To solve the above-mentioned problems, the present invention provides a kind of straw paper pulp fiber-starch degradable THIN COMPOSITE Film, straw paper pulp fiber-starch degradable laminated film raw material include the ingredient of following mass fraction: straw paper pulp fiber 10-47 parts, 30-57 parts of starch, 23-33 parts of glycerol.

Wherein, straw paper pulp fiber refers to using straw, passes through chemical method, semichemical method, chemical mechanical pulping, bio-mechanical method And the methods of Mechanical Method processes obtained straw plants fibre stuff, such as utilizes traditional caustic soda-anthraquinone method, potassium hydroxide The methods of alkaline process, chemical mechanical pulping process obtained vegetable-fibre slurry, are raw materials for production common in pulp and paper industry, mesh Preceding has been a kind of matured product of pulp industry, can directly be bought in the market.

Wherein, potato starch, tapioca, cornstarch, wheaten starch and konjaku may be selected according to its source in starch The mixing of one or more of starch.Various starch are the product that can be bought on the market.

Usually contain part moisture content, quality described herein in the starch of straw paper pulp fiber and various plant origins Number, mass concentration calculating standard be to be calculated with the absolute dry mass of straw paper pulp fiber, starch, absolute dry mass refers to straw paper Pulp fibres and starch remove the quality of moisture content completely.

Straw paper pulp fiber-starch degradable laminated film of the invention is using straw paper pulp fiber as reinforcing filler, with sweet Oil is plasticiser, and straw paper pulp fiber has stronger mechanical performance and good water resistance, remains plant fiber cells Fibre-like morphology, straw paper pulp fiber is woven into a mesh structure in starch film, improves the intensity of finished product, limits simultaneously Starch molecule moves freely to reduce green deformation, the film phase of the laminated film of formation and the preparation of simple starch Than mechanical strength significantly improves, and water resistance significantly improves；Straw paper pulp fiber is the matured product in pulp industry, is not necessarily to It reuses other reagents and carries out physical or chemical treatment, can directly buy use, and straw paper pulp fiber, starch belong to and can drop Material is solved, and renewable, it is from a wealth of sources, it is cheap and easy to get, therefore, have broad application prospects.

In technical solution, it is preferable that straw paper pulp fiber-starch degradable laminated film is with a thickness of 80-100 μm.

It is a further object of the present invention to provide a kind of sides for preparing above-mentioned straw paper pulp fiber-starch degradable laminated film Method, comprising the following steps:

S1. starch, straw paper pulp fiber and glycerol are mixed according to setting ratio, and are diluted with water, obtain mixed liquor；

S2. Heat Gelatinization is carried out to mixed liquor, obtains gelatinization feed liquid；

S3. gelatinization feed liquid is de-gassed；

S4. the gelatinization feed liquid after degassing is formed a film and is dried, obtain straw paper pulp fiber-starch degradable laminated film.

Of the invention prepares straw paper pulp fiber-starch degradable laminated film method, directly applies in preparation process Matured product straw paper pulp fiber in pulp industry, without add other chemical reagent to straw paper pulp fiber at Reason, preparation process is simple, not can cause environmental pollution；The straw paper pulp fiber and starch used in preparation process, source are wide General and degradable, the feature of environmental protection is strong；The straw paper pulp fiber being prepared-starch degradable laminated film machinery performance is strong, thin Film stretching intensity is up to 10-30Mpa, and elongation at break is in 9%-16%, water-tolerant, hydroscopicity 19%-22%, water solubility For 15%-20, swelling ratio 1%-5%.

In technical solution, it is preferable that calculated by absolute dry mass, in the mixed liquor obtained after diluting in step S1 starch with The total mass concentration of straw paper pulp fiber is 3%-5%.

In technical solution, it is preferable that the gelatinization point of Heat Gelatinization is 70-90 DEG C in step S2, gelatinization time 30- 60min。

In technical solution, it is preferable that be centrifugation degassing to the method that gelatinization feed liquid is de-gassed in step S3.

In technical solution, it is preferable that the method to form a film in step S4 specifically: will degassing by way of blade coating or spin coating Gelatinization feed liquid afterwards is coated in the surface filming of substrate.

In technical solution, it is preferable that drying temperature is 70-100 DEG C in step S4.

In technical solution, it is preferable that it further include being pre-processed before step S1 to straw paper pulp fiber, pretreatment packet Include following steps:

S0. straw paper pulp fiber is successively discongested, screened and is beaten, obtain pretreated straw paper pulp fiber.

In technical solution, it is preferable that calculated by absolute dry mass, straw when being discongested in step S0 to straw paper pulp fiber The mass concentration of paper pulp fiber is 2%-5%；Discongesting the time is 5-10min.

In technical solution, it is preferable that filter out straw paper pulp fiber of the granularity less than 0.15mm in step S0 and be beaten.

In technical solution, it is preferable that straw paper pulp fiber concentration when being beaten in step S0 to straw paper pulp fiber It is 10%.

Compared with the prior art, the present invention has the following beneficial effects:

1. straw paper pulp fiber-starch degradable laminated film of the invention is using straw paper pulp fiber as reinforcing filler, with Glycerol is plasticiser, and straw paper pulp fiber has stronger mechanical performance and good water resistance, it is thin to remain plant fiber The fibre-like morphology of born of the same parents, straw paper pulp fiber is woven into a mesh structure in starch film, improves the intensity of finished product, same to time limit That has made starch molecule moves freely to reduce green deformation, the film phase that the laminated film of formation is prepared with simple starch Than mechanical strength significantly improves, and water resistance significantly improves；Straw paper pulp fiber is the matured product in pulp industry, is not necessarily to It reuses other reagents and carries out physical or chemical treatment, can directly buy use, and straw paper pulp fiber, starch belong to and can drop Material is solved, and renewable, it is from a wealth of sources, it is cheap and easy to get, therefore, have broad application prospects；

2. of the invention prepares straw paper pulp fiber-starch degradable laminated film method, directly answered in preparation process With the matured product straw paper pulp fiber in pulp industry, without add other chemical reagent to straw paper pulp fiber at Reason, preparation process is simple, not can cause environmental pollution；The straw paper pulp fiber and starch used in preparation process, source are wide General and degradable, the feature of environmental protection is strong；The straw paper pulp fiber being prepared-starch degradable laminated film machinery performance is strong, thin Film stretching intensity is up to 10-30Mpa, and elongation at break is in 9%-16%, water-tolerant, hydroscopicity 19%-22%, water solubility For 15%-20, swelling ratio 1%-5%.

Specific embodiment

Below in conjunction with the embodiment of the present invention, technical solution of the present invention is clearly and completely described, it is clear that Described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the implementation in the present invention Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to The scope of protection of the invention.

In following embodiment, straw paper pulp fiber is purchased from Shandong Quanlin Group and Shandong brilliance Paper Co., Ltd；Starch It is derived from glycerol in commercially available.

Comparative example

The starch degradable laminated film of this comparative example the preparation method is as follows:

70 parts of starch and 30 parts of glycerol are mixed, and are diluted with water, mixed liquor is obtained.Mixed liquor is heated to 70 DEG C More than, and keep the temperature 30 minutes or more, the available starch solution being sufficiently gelatinized carries out ultrasonic degassing, centrifugation to gelatinization feed liquid Degassing process, finally, being prepared into film by the gelatinization feed liquid after degassing on knifing machine, the spacing of scraper is set as 200 μm, Then resulting film is dried at 60 DEG C, obtains starch degradable laminated film.