WO2017084227A1

WO2017084227A1 - A lightweight environmentally friendly biomass packaging material and preparation method therefor

Info

Publication number: WO2017084227A1
Application number: PCT/CN2016/077288
Authority: WO
Inventors: 张新昌; 张哲源; 冯建华; 严欢; 尹轩; 陈丹蕙; 范俞静; 程雪妍; 孙昊; 王利强
Original assignee: 江南大学
Priority date: 2015-11-19
Filing date: 2016-03-25
Publication date: 2017-05-26
Also published as: CN105252628A

Abstract

Provided is a lightweight environmentally friendly biomass packaging material and preparation method therefor, wherein a biomass fiber material is used as a substrate, soy protein is used as an adhesive, a small quantity of environmentally friendly adjuvants are added, forming a packaging material of a certain mechanical strength following spreading, forming, and hot-pressing within, and demolding from, a mold. Said packaging material may be used for the shipment packaging of products; to produce supporting members and filling members with cushioning properties; to produce non-load bearing components of trays and packing containers; and may also be used in the construction materials and furniture industries. The packaging material offers the advantages of being low-cost, lightweight, non-polluting and readily degradable.

Description

Light and environmentally friendly biomass packaging material and preparation method thereof

[0001] The present invention relates to a lightweight environmentally friendly biomass packaging material and a preparation method thereof, in particular to a waste paper fiber and orange stalk as raw materials, and a soy protein adhesive as an environmentally friendly adhesive, which is produced by a hot pressing process. Non-bearing parts of pallets and large sliding wood boxes, such as support materials, spacers, fillers, etc., are made of lightweight materials, degradable biomass materials and related technical fields. This material and method of preparation can also be used in the building materials and furniture industries.

Background technique

[0002] With the depletion of fossil resources such as coal and oil and increasing environmental pressures, it is becoming more and more urgent to use renewable green resources. At present, there are three main ways of utilizing biomass resources in the world, namely biomass materials, biomass energy and pulp. Among them, biomass materials are an important way. It is a woody plant, a grass plant and The vines and their processing residues and wastes are raw materials, and new materials with excellent performance and high added value are processed through high-tech means such as physics, chemistry and biology.

[0003] The existing lightweight packaging materials mainly focus on the use of foaming agents and foaming materials to achieve light weight. The application number is 201010502013.0, which is a method for preparing a lightweight thermal insulation board by using hot gelatinized starch as a binder, and provides a method for preparing a thermally gelatinized starch as a binder, waste plant fiber and waste polystyrene foam as raw materials. The method of lightweight and environmentally friendly insulation materials, but does not consider the pollution problem of polystyrene foam. The application number is 201410024235.4, which is a preparation method of a plant fiber buffer packaging material, and provides a plant fiber as a raw material, using azodicarbonamide and ammonium hydrogencarbonate as a foaming agent, and preparing light by microblogging foaming. The method of quality material, but does not consider the disadvantages of high cost of foaming agent, difficulty in controlling gas, pollution of the environment, etc., and does not consider the industrial production problem of microwave foaming.

[0004] The adhesives used in the existing plant fiber products are mostly synthetic resins, and the raw material price is rising, and the harmful harmful gases such as free formaldehyde and free phenol in the adhesive are harmful to human health. Concerned about the use of biomass as a basic raw material to develop green environmentally friendly adhesives has become a research hotspot. Application No. 2 01310374158.0, the name is a preparation method of adhesive for wheat straw board, made by MDI, HPMA, etc. The adhesive for fiber preparation has good stability and good water resistance and mechanical mechanical properties, but has the problems of high raw material cost and complicated preparation process.

technical problem

[0005] One of the objects of the present invention is to provide a green and environmentally-friendly biomass material for the current environmental pollution of a sheet during degradation, thereby realizing greening and degradable materials.

[0006] The second object of the present invention is to improve the process of the current lightweight board, and provide a formula and a preparation scheme of a lightweight board without a foaming agent, that is, reducing the amount of raw materials used, and preparing the light by a hot pressing process. Quality plate.

[0007] The third object of the present invention is to provide a formulation for preparing an adhesive using soy protein as a raw material for the cost and pollution problem of the current wood adhesive, thereby achieving green environmental protection.

Problem solution

Technical solution

[0008] According to the technical solution provided by the present invention, a method for preparing a lightweight environmentally-friendly biomass packaging material, comprising a substrate Oy^SSy^ adhesive 5<3⁄4~15<3⁄4, a water repellent Sy^lOy^ Formulation 1<3⁄4~3<3⁄4, crosslinker 0.3-1%;

[0009] The substrate is pretreated and subjected to fiber separation, and the adhesive is modified, and the raw materials are thoroughly stirred and mixed uniformly, then laid in a mold, and hot pressed on a hot press. Lightweight and environmentally friendly biomass materials.

[0010] The substrate is waste paper fiber, or one or several mixed fiber raw materials in waste paper and crop orange stalk, wood, bamboo, and aquatic plants.

[0011] the adhesive is a modified soybean protein adhesive, the modifier is specifically a mixture of NaOH and Ca(OH) 2, one or more of SDBS, urea; wherein each modifier and soybean The protein ratio is: NaOHO.08-0. 24% Ca(OH)20.08-0.24<3⁄4, SDBSl-2%, urea 6-18<3⁄4.

[0012] The water repellent is specifically a paraffin type water repellent.

[0013] The compounding agent is an organic polymer, specifically carboxymethylcellulose or sodium carboxymethylcellulose.

[0014] The crosslinking agent is specifically sodium tetraborate decahydrate.

[0015] The method for preparing the lightweight environmentally-friendly biomass packaging material is characterized in that the steps according to the mass fraction are as follows: [0016] (1) Treatment of the substrate:

[0017] Waste paper fiber: Soak the discarded corrugated board in water for a period of time, wash away the residual glue on the surface, grind the slurry with a water pulper, and filter out excess water to ensure the water content is 60%~70<3⁄4. Refilled into a sealed plastic bag for bath treatment;

[0018] wherein the water bath temperature is 60-90 ° C, water bath 10-30 min;

[0019] The fiber raw materials such as orange stalks, wood, bamboo, and aquatic plants are pretreated with NaOH solution, taken out after a certain period of time, and the lye on the surface is washed away, and then left to stand still;

[0020] (2) Adhesive modification: The soy protein is modified and treated with one or more of the following modifiers.

[0021] a, NaOH and / or Ca (OH) 2: soy protein, NaOH, Ca (OH) 2 is added to the water in a certain mass ratio, fully stirred, and then subjected to a water bath treatment;

[0022] b, SDBS: Soy protein and SDBS are added to the water in a certain mass ratio, and after being fully stirred, the water bath is treated;

[0023] c, urea: urea and soy protein in a certain mass ratio of water, fully stirred, and then treated with water bath;

[0024] wherein the ratio of soy protein to water is 8-15%, the water bath temperature is 40-60 ° C, the water bath is 40-60 min, the stirring speed is 30-60 r / min;

[0025] (3) Adhesive preparation: modified soybean protein adhesive prepared in step (2), water repellent, compounding agent

The cross-linking agent is thoroughly mixed at room temperature, and stirred for use;

[0026] (4) Fiber sizing: uniformly spraying the adhesive prepared in the step (3) on the substrate prepared in the step (1)

, mixed and dried to a moisture content of 20<3⁄4~50<3⁄4 spare;

[0027] (5) Hot press forming: The material prepared in the step (4) is paved in a mold, and the mold is placed in the center of the hot press to be hot pressed, and the lightweight environmentally friendly biomass can be obtained after demolding. Material

[0028] wherein the hot pressing temperature is 120-160 ° C, the hot pressing pressure is 3-7 MPa, and the hot pressing is 20-140 min.

Advantageous effects of the invention

Beneficial effect

[0029] The present invention has significant advantages over existing biomass hot pressed sheets:

[0030] (1) using a large amount of packaging waste paper in life and rich lignocellulose components in plant orange stalks, The packaged waste paper and the plant orange stalk are processed in a series of ways to form a plate-like material to replace the petroleum-based chemical reagent component. It can effectively utilize the packaging waste paper and plant orange stalk resources, reduce the production cost, be green and environmentally friendly, and the produced plates can be used for transportation packaging of products, and can be made into support parts, spacers, filling parts with certain cushioning properties, and placed. In the packaging container to protect the product, it can also be used to make non-loading parts of pallets, large sliding wood packaging boxes, saving packaging materials consumption, etc. After use, it can be degraded into water by microorganisms or light in the natural environment. Carbon dioxide does not cause environmental pollution.

[0031] (2) Lightening the plate under the premise of ensuring certain mechanical strength, weight reduction effect, and nail holding force

With no foaming agent, it is greener and more environmentally friendly.

[0032] (3) Lightweight and environmentally friendly biomass materials prepared by this method are not only used in the packaging field, but also used in the building materials and furniture industries for processing light wall materials or filling materials.

Brief description of the drawing

DRAWINGS

[0033] FIG. 1 is a preparation process of a lightweight environmentally friendly biomass packaging material.

Embodiments of the invention

[0034] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0035] Embodiment 1

[0036] (1) Treatment of the substrate:

[0037] Waste paper fiber: Soak the discarded corrugated board in water for a while, wash away the residual glue on the surface, grind the slurry with a water pulper, and filter out excess water to ensure the moisture content is 60%. Refilled into a sealed plastic bag for treatment

[0038] wherein the water bath temperature is 90 ° C, water bath for 20 min;

[0039] The wheat stalk is pretreated with NaOH solution, taken out after a certain period of time, and the lye on the surface is washed away, and then rested for use;

[0040] (2) Adhesive modification: The soy protein is modified and treated with the following modifiers:

[0041] NaOH and Ca(OH)2: Soy protein, NaOH, . & (0 2 added water in a mass ratio of 100:1:1

After fully stirring, perform a water bath treatment;

[0042] wherein the soy protein and water ratio is 10%, the water bath temperature is 40 ° C, the water bath is 60 min, the stirring speed Degree is 30r/min;

[0043] (3) Adhesive preparation: modified soybean protein adhesive prepared in step (2), water repellent, compounding agent

[0044] (4) Fiber sizing: uniformly spraying the adhesive prepared in the step (3) on the substrate prepared in the step (1)

, mixed and dried to a moisture content of 50%;

[0045] (5) Hot press forming: the material prepared in the step (4) is paved in a mold, and the mold is placed in the center of the hot press to be hot pressed, and the lightweight environmentally friendly biomass can be obtained after demolding. Material

[0046] wherein the hot pressing temperature is 140 ° C, the hot pressing pressure is 3 MPa, and the hot pressing time is 140 min.

[0047] The obtained sheet has a static bending strength of 9.07 MPa, an elastic modulus of 1686.30 MPa, and a water absorption thickness expansion ratio of 10.0% for 2 hours.

[0048] Embodiment 2

[0049] (1) Treatment of the substrate:

[0050] Waste paper fiber: Soak the discarded corrugated board in water for a period of time, wash away the residual glue on the surface, grind the slurry with a water grinder, and filter out excess water to ensure the water content is 65%. Refilled into a sealed plastic bag for treatment

[0051] wherein the water bath temperature is 80 ° C, water bath for 25 min;

[0052] The wheat stalk is pretreated with NaOH solution, taken out after a certain period of time, and the lye on the surface is washed away, and then rested for use;

[0053] (2) Adhesive modification: The soy protein is modified and treated with the following modifiers:

[0054] SDBS: adding soy protein and SDBS to water in a certain mass ratio, fully stirring, and then performing a water bath treatment;

[0055] wherein the ratio of soy protein to water is 10%, the water bath temperature is 40 ° C, the water bath time is 60 min, the stirring speed is 30 r / min;

[0056] (3) Adhesive preparation: modified soybean protein adhesive prepared in step (2), water repellent, compounding agent

[0057] (4) Fiber sizing: The adhesive prepared in the step (3) is uniformly sprayed on the substrate prepared in the step (1)

, mixed and dried to a moisture content of 40%;

[0058] (5) hot press forming: the material prepared in step (4) is laid in a mold, and the mold is placed in hot pressing In the center of the machine, hot pressing, after demolding, can produce lightweight and environmentally friendly biomass materials;

[0059] wherein the hot pressing temperature is 140 ° C, the hot pressing pressure is 3 MPa, and the hot pressing is 120 min.

[0060] The obtained sheet had a static bending strength of 6.36 MPa, an elastic modulus of 2685.85 MPa, and a water absorption thickness expansion ratio of 16.0% for 2 hours.

Example 3

[0062] (1) Treatment of the substrate:

[0063] Waste paper fiber: Soak the discarded corrugated board in water for a period of time, wash away the residual glue on the surface, grind the slurry with a water grinder, and filter out excess water to ensure the water content is 70%. Refilled into a sealed plastic bag for treatment

[0064] wherein the water bath temperature is 70 ° C, water bath for 30 min;

[0065] The wheat stalk is pretreated with NaOH solution, taken out after a certain period of time, and the lye on the surface is washed away, and then rested for use;

[0066] (2) Adhesive modification: The soy protein is modified and treated with the following modifiers:

[0067] Urea: Urea and soy protein are added to water in a mass ratio of 1:1, and after being uniformly stirred, the water bath is treated;

[0068] wherein the ratio of soy protein to water is 10%, the water bath temperature is 40 ° C, the water bath is 60 min, and the stirring speed is 40 r / min;

[0069] (3) Adhesive preparation: modified soybean protein adhesive prepared by the step (2), water repellent, compounding agent

[0070] (4) Fiber sizing: uniformly spraying the adhesive prepared in the step (3) on the substrate prepared in the step (1)

, mixed and dried to a moisture content of 30% for use;

[0071] (5) Hot press forming: the material prepared in the step (4) is paved in a mold, and the mold is placed in the center of the hot press to be hot pressed, and the lightweight environmentally friendly biomass can be obtained after demolding. Material

[0072] wherein the hot pressing temperature is 160 ° C, the hot pressing pressure is 3 MPa, and the hot pressing is 140 min.

[0073] The obtained sheet had a static bending strength of 5.17 MPa, an elastic modulus of 675.23 MPa, and a water absorption thickness expansion ratio of 1 1.6% for 2 hours.

Claims

Claim

[Claim 1] A lightweight environmentally-friendly biomass packaging material characterized by: achieving environmentally friendly and lightweight materials

, Raw materials including substrate Oy^SSy^ Adhesive 5<3⁄4~15<3⁄4, Water repellent Sy^lOy^ Reagent l^ Sy^ Crosslinking agent 0.3-1%;

The substrate is pretreated and subjected to fiber separation, and the adhesive is modified. The raw materials are thoroughly stirred and mixed uniformly, then laid in a mold, and hot pressed on a hot press to obtain a light and environmentally friendly product. Biomass material.

[Claim 2] The lightweight environmentally-friendly biomass packaging material according to claim 1, wherein: the substrate is waste paper fiber, or one of waste paper and crop orange stalk, wood, bamboo, aquatic plant Or several mixed fiber raw materials.

[Claim 3] The lightweight environmentally-friendly biomass packaging material according to claim 1, wherein: the modified soybean protein is used as an adhesive, and the modifier is specifically a mixture of NaOH and Ca(OH)2, SDBS, and urea. One or several.

[Claim 4] The modified soybean protein according to claim 3 is an adhesive, characterized in that each modifier is blended with soybean protein: NaOH 0.08-0.24<3⁄4, Ca(OH)20.08-0.24<3⁄4, SDBSl -2%, urea 6-18<3⁄4.

[Claim 5] The lightweight environmentally-friendly biomass packaging material according to claim 1, wherein the water repellent is a paraffin-based water repellent.

[Claim 6] The lightweight environmentally-friendly biomass packaging material according to claim 1, wherein the compounding agent is an organic polymer, specifically carboxymethylcellulose or sodium carboxymethylcellulose.

[Claim 7] The lightweight environmentally-friendly biomass packaging material according to claim 1, wherein the crosslinking agent is specifically sodium tetraborate decahydrate.

[Claim 8] The method for preparing a lightweight environmentally-friendly biomass packaging material according to claim 1, wherein the steps according to the mass fraction are as follows:

(1) Treatment of the substrate:

Waste paper fiber: Soak the discarded corrugated board in water for a while, wash away the residual glue on the surface, grind the pulp with a water pulper, and filter out excess water to ensure the water content is 60<3⁄4~70%. Refilled into a sealed plastic bag water bath; Wherein the water bath temperature is 60-90 ° C, and the water bath is 10-30 min;

The fiber raw materials such as orange stalks, wood, bamboo and aquatic plants are pretreated with NaOH solution, and taken out after a certain period of time. After washing off the surface lye, it is allowed to stand still;

(2) Adhesive modification: The soy protein is modified and treated with one or more of the following modifiers:

a, NaOH and / or Ca (OH) 2: Soy protein, NaOH, Ca (OH) 2 is added to the water in a certain mass ratio, fully stirred, and then subjected to a water bath treatment;

b, SDBS: Add soy protein and SDBS to water in a certain mass ratio, stir well and then perform water bath treatment;

c. Urea: Add urea and soy protein to water in a certain mass ratio, stir well, and then perform water bath treatment;

The ratio of soy protein to water is 8-15%, the water bath temperature is 40-60 ° C, the water bath time is 40-60 min, and the stirring speed is 30-60 r/min;

(3) Adhesive preparation: The modified soy protein adhesive prepared in step (2), water repellent, compounding agent and cross-linking agent are thoroughly mixed at room temperature, stirred evenly and then used;

(4) Fiber sizing: Spray the adhesive prepared in step (3) evenly on the substrate prepared in step (1), and mix and dry to a moisture content of 20<3⁄4~50<3⁄4 for use;

(5) Hot press forming: the material prepared in step (4) is paved in a mold, and the mold is placed in the center of the hot press to be hot pressed, and the light-weight and environmentally-friendly biomass material can be obtained after demolding; The hot pressing temperature is 120-160 ° C, the hot pressing pressure is 3-7 MPa, and the hot pressing is 20-140 min.